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MAX8717ETI , Interleaved High-Efficiency, Dual Power-Supply Controllers for Notebook Computers
MAX8717ETI+ ,Interleaved High-Efficiency, Dual Power-Supply Controllers for Notebook ComputersApplications28 Thin QFNMAX8717ETI -40°C to +85°C T2855-62 to 4 Li+ Cell Battery-Powered Devices5mm ..
MAX8717ETI+T ,Interleaved High-Efficiency, Dual Power-Supply Controllers for Notebook ComputersELECTRICAL CHARACTERISTICS(Circuit of Figure 1, V = 12V, FSEL = REF, SKIP_ = 0, V = V = V = V = 5V ..
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MB84VD22181FM-70PBS , 32M (X16) FLASH MEMORY & 4M (X16) STATIC RAM
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MB84VD22183EE-90 ,32M (x 8/x16) FLASH MEMORY & 4M (x 8/x16) STATIC RAMFEATURES• Power supply voltage of 2.7 to 3.3 V• High performance90 ns maximum access time (Flash)85 ..
MB84VD22184FM-70 , 32M (X16) FLASH MEMORY & 4M (X16) STATIC RAM
MAX8716ETG+-MAX8716ETG+T-MAX8717ETI+-MAX8717ETI+T
Interleaved High-Efficiency, Dual Power-Supply Controllers for Notebook Computers
General DescriptionThe MAX8716/MAX8717/MAX8756/MAX8757 are dual,
step-down, interleaved, fixed-frequency, switch-mode
power-supply (SMPS) controllers with synchronous rec-
tification. The MAX8716/MAX8717/MAX8756/MAX8757
are intended for main (5V/3.3V) power generation, while
the MAX8756 is optimized for I/O power rails in battery-
powered systems.
Fixed-frequency operation with optimal interleaving min-
imizes input ripple current from the lowest input voltages
up to the 26V maximum input. Optimal 40/60 interleav-
ing allows the input voltage to go down to 8.3V before
duty-cycle overlap occurs in 5V/3.3V applications, com-
pared to 180°out-of-phase regulators where the duty-
cycle overlap occurs when the input drops below 10V.
Accurate output current limit is achieved using a sense
resistor. Alternatively, power dissipation can be
reduced using lossless inductor current sensing.
Independent ON/OFF controls and power-good signals
allow flexible power sequencing. Soft-start reduces
inrush current, while soft-stop gradually ramps the out-
put voltage down preventing negative voltage dips.
A low-noise mode maintains high light-load efficiency
while keeping the switching frequency out of the audi-
ble range.
The MAX8716 is available in a 24-pin thin QFN pack-
age, and the MAX8717/MAX8756/MAX8757 are avail-
able in a 28-pin thin QFN package.
Applications2 to 4 Li+ Cell Battery-Powered Devices
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
Main or I/O Power Supplies
FeaturesFixed Switching Frequency
200kHz, 300kHz, or 500kHz
250kHz, 300kHz, or 400kHz (MAX8756 Only)No Current-Sense Resistor Required40/60 Optimal InterleavingReduced Input-Capacitor RequirementOutput Voltage Fixed or Adjustable Outputs
(Dual Mode™)
3.3V/5V Fixed or 1V to 5.5V Adjustable
1.5V/1.8V Fixed or 1V to 2.3V Adjustable
(MAX8756 Only)4V to 26V Input RangeIndependently Selectable PWM, Skip, and Low-
Noise Mode OperationSoft-Start and Soft-Stop2V Precision Reference with 0.75% AccuracyIndependent Power-Good Outputs
MAX8716/MAX8717/MAX8756/MAX8757
Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook ComputersPGOOD1
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.
FB1
CSL1
CSH1
BST1
DH1
PGOOD2
FB2
CSL2
CSH2
BST2
DH21415161718
LX2DL2VDDGNDDL1LX154321
ON2ON1
SKIP2
REF
SKIP1
VCC
MAX8716ETG
TOP VIEW161718192021654321
MAX8717ETI
MAX8756ETI+MAX8757ETI+
TQFN
TQFNTOP VIEW
SKIP1
VCCREF
SKIP2
FSEL
ON1ON2
ILIM1
PGOOD1
FB1
CSL1
CSH1
BST1
DH1
LX1DL1AGNDPGNDVDDDL2LX2
DH2
BST2
CSH2
CSL2
FB2
PGOOD2
ILIM2
+
Pin Configurations
Ordering Information19-3569; Rev 2; 4/07
PARTTEMP RANGEPIN-
PACKAGE
PKG
CODE
MAX8716ETG-40°C to +85°C24 Thin QFN
4mm x 4mmT2444-4
MAX8716ETG+-40°C to +85°C24 Thin QFN
4mm x 4mm T2444-4
MAX8717ETI-40°C to +85°C28 Thin QFN
5mm x 5mmT2855-6
Dual Mode is a trademark of Maxim Integrated Products, Inc.
+Denotes a lead-free package.
Ordering Information continued at end of data sheet.
EVALUATION KIT
AVAILABLE
MAX8716/MAX8717/MAX8756/MAX8757
Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
ABSOLUTE MAXIMUM RATINGS (Note 1)Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VDD, VCC, CSL1, CSH1, CSL2, CSH2 to AGND......-0.3V to +6V
ON1, ON2, SKIP1, SKIP2, PGOOD1,
PGOOD2 to AGND...............................................-0.3V to +6V
FB1, FB2, ILIM1, ILIM2, FSEL to AGND...................-0.3V to +6V
REF to AGND..............................................-0.3V to (VCC+ 0.3V)
BST1, BST2 to AGND.............................................-0.3V to +36V
LX1 to BST1..............................................................-6V to +0.3V
LX2 to BST2..............................................................-6V to +0.3V
DH1 to LX1..............................................-0.3V to (VBST1+ 0.3V)
DH2 to LX2..............................................-0.3V to (VBST2+ 0.3V)
DL1, DL2 to PGND.....................................-0.3V to (VDD+ 0.3V)
AGND to PGND.....................................................-0.3V to +0.3V
REF Short Circuit to AGND.........................................Continuous
REF Current......................................................................+10mA
Continuous Power Dissipation (TA= +70°C)
24-Pin Thin QFN 4mm x 4mm (derate 20.8mW/°C
above +70°C)..........................................................1666.7mW
28-Pin Thin QFN 5mm x 5mm (derate 21.3mW/°C
above +70°C)..........................................................1702.1mW
Operating Temperature Range...........................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, VIN= 12V, FSEL = REF, SKIP_= 0, VON_= VILIM_= VCC= VDD = 5V,
TA= 0°C to +85°C, unless otherwise noted.Typical values are at TA= +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
INPUT SUPPLIESVIN26Input Voltage Range
VBIASVCC, VDD4.55.5
VCC rising3.94.154.4VCC Undervoltage-Lockout
ThresholdVUVLO200mV typical
hysteresisVCC falling3.73.954.2V
MAX8716, MAX8717,
MAX87570.81.3Quiescent Supply Current (VCC)ICC
CSL_ and FB_ forced
above their regulation
pointsMAX875611.8
Quiescent Supply Current (VDD)IDDCSL_ and FB_ forced above their regulation
points< 15µA
Shutdown Supply Current (VCC)ON1 = ON2 = GND< 15µA
Shutdown Supply Current (VDD)ON1 = ON2 = GND< 15µA
MAIN SMPS CONTROLLERSMAX8716, MAX8717,
MAX87573.2653.303.365PWM1 Output Voltage in
Fixed ModeVOUT1
VIN = 6V to 26V,
SKIP1 = VCC,
zero to full loadMAX87561.4841.501.530
MAX8716, MAX8717,
MAX87574.945.005.09PWM2 Output Voltage in
Fixed ModeVOUT2
VIN = 6V to 26V,
SKIP2 = VCC,
zero to full loadMAX87561.7781.8001.832
VIN = 6V to 26V, FB1 or FB2,
duty factor = 20% to 80%0.9901.0051.020Feedback Voltage in Adjustable
Mode (Note 2)VFB_VIN = 6V to 26V, FB1 or FB2,
duty factor = 50%0.9951.0051.015
MAX8716, MAX8717,
MAX87571.05.5Output-Voltage-Adjust RangeEither SMPS
MAX87561.02.3
Note 1:For the 24-pin TQFN version, AGND and PGND refer to a single pin designated GND.
MAX8716/MAX8717/MAX8756/MAX8757
Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VIN= 12V, FSEL = REF, SKIP_= 0, VON_= VILIM_= VCC= VDD = 5V,
TA= 0°C to +85°C, unless otherwise noted.Typical values are at TA= +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSFB1, FB2 Fixed-Mode Threshold
VoltageDual Mode comparator1.92.1V
Feedback Input Leakage CurrentFB1 = 1.1V, FB2 = 1.1V-0.1+0.1µA
DC Load RegulationEither SMPS, SKIP_ = VCC, zero to full load-0.1%
Line-Regulation ErrorEither SMPS, 4V < VIN < 26V0.03%/V
FB_ Input Bias CurrentIFB_VFB_ = 0 to 5.5V-0.1+0.1µA
MAX8716, MAX8717,
MAX8757170200230FSEL = GND
MAX8756215250285
FSEL = REF (Note 3)270300330
MAX8716, MAX8717,
MAX8757425500575
Operating FrequencyfOSC
FSEL = VCC
MAX8756340400460
kHz
FSEL = GND97.599
FSEL = REF (Note 3)97.599Maximum Duty FactorDMAX
FSEL = VCC97.599
Minimum On-TimetON(MIN)(Note 4)200ns%SMPS1 to SMPS2 Phase ShiftSMPS2 starts after SMPS1144Degrees
Soft-Start Ramp TimetSSTARTMeasured from the rising edge of ON_ to full
scale, REF = 2V2ms
Soft-Stop Ramp TimetSSTOPMeasured from the falling edge of ON_ to full
scale4ms
CURRENT LIMITILIM_ Adjustment Range0.5VREFV
Current-Limit Threshold (Fixed)VLIMIT_VCSH_ - VCSL _, ILIM_ = VCC (Note 3)455055mV
VILIM_ = 2.00V190200210Current-Limit Threshold
(Adjustable)VLIMIT_VCSH_ - VCSL _VILIM_ = 1.00V94100106mV
VCSH_ - VCSL _, SKIP_ = ILIM_ = VCC
(Note 3)-67-60-53mV
Current-Limit Threshold
(Negative)VNEG
VCSH_ - VCSL _, SKIP_ = VCC, adjustable
mode, percent of current limit-120%
Current-Limit Threshold
(Zero Crossing)VZXVCSH_ - VCSL _, SKIP_ = GND or REF3mV
ILIM_ = VCC (Note 3)61014mV
Idle Mode™ ThresholdVIDLEVCSH_ - VCSL _,
SKIP_ = GND
With respect to
current-limit
threshold%
Idle Mode is a trademark of Maxim Integrated Products, Inc.
MAX8716/MAX8717/MAX8756/MAX8757
Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VIN= 12V, FSEL = REF, SKIP_= 0, VON_= VILIM_= VCC= VDD = 5V,
TA= 0°C to +85°C, unless otherwise noted.Typical values are at TA= +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSAX 8716, M AX 8717,AX 87572.557.5VCSH_ - VCSL_
SKIP_ = REF
ILIM_ = VCC (Note 3)MAX875612.54AX 8716, M AX 8717,AX 875710Low-Noise-Mode ThresholdVIDLEVCSH_ - VCSL_
SKIP_ = REF with
respect to current-
limit thresholdMAX87565
ILIM_ Leakage Current0.1µA
Reference Load RegulationΔVREFIREF = 0µA to 50µA10mV
Reference Sink Current10µA
REF Lockout VoltageVREF(UVLO)Rising edge, hysteresis = 50mV1.8V
FAULT DETECTIONOutput Overvoltage Trip
ThresholdMAX8716/MAX8717/MAX8756 only111519%
Output Overvoltage
Fault-Propagation DelaytOVP50mV overdrive,
MAX8716/MAX8717/MAX8756 only10µs
Output Undervoltage-Protection
Trip ThresholdWith respect to error-comparator threshold657075%
Output Undervoltage
Fault-Propagation DelaytUVP50mV overdrive10µs
Output Undervoltage-Protection
Blanking TimetBLANKFrom rising edge of ON_61441/fOSC
PGOOD_ Lower Trip ThresholdWith respect to error-comparator threshold,
hysteresis = 1%-12.5-10-8.0%
PGOOD_ Propagation DelaytPGOOD_Falling edge, 50mV overdrive10µs
PGOOD_ Output Low VoltageISINK = 4mA0.4V
PGOOD_ Leakage CurrentIPGOOD_High state, PGOOD_ forced to 5.5V1µA
Thermal-Shutdown ThresholdTSHDNHysteresis = 15°C+160°C
GATE DRIVERSDH_ Gate-Driver On-ResistanceRDHBST_ - LX_ forced to 5V (Note 5)1.55Ω
DL_, high state1.75DL_ Gate-Driver On-Resistance
(Note 5)RDL
DL_, low state0.63Ω
DH_ Gate-Driver Source/Sink
CurrentIDHDH_ forced to 2.5V, BST_ - LX_ forced to2A
DL_ Gate-Driver Source CurrentIDL
(SOURCE)DL_ forced to 2.5V1.7A
DL_ Gate-Driver Sink CurrentIDL (SINK)DL_ forced to 2.5V3.3A
DL_ rising35Dead TimetDEADDH_ rising26ns
LX_, BST_ Leakage CurrentVBST_ = VLX_ = 26V< 220µA
MAX8716/MAX8717/MAX8756/MAX8757
Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
INPUTS AND OUTPUTSLogic Input CurrentON1, ON2-1+1µA
ON_ Input VoltageRising edge, hysteresis = 225mV1.21.72.2V
Tri-Level Input LogicSKIP1, SKIP2, FSEL, highVCC -
0.2V
Input Leakage CurrentSKIP1, SKIP2, FSEL, 0V, or VCC-3+3µA
Input Leakage CurrentILIM1, ILIM2, 0V, or VCC-0.1+0.1µA
Input Leakage CurrentCSH_, 0V, or VDD-0.1+0.1µA
Input Bias CurrentCSL_, 0V, or VDD2550µA
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VIN= 12V, FSEL = REF, SKIP_= 0, VON_= VILIM_= VCC= VDD = 5V,
TA= 0°C to +85°C, unless otherwise noted.Typical values are at TA= +25°C.)
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, VIN= 12V, FSEL = REF, SKIP_= 0, VON_= VILIM_= VCC = VDD = 5V, TA
= -40°C to +85°C,unless otherwise
noted.) (Note 6)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
INPUT SUPPLIESVIN26Input Voltage RangeVBIASVCC, VDD4.55.5V
MAX8716, MAX8717,
MAX87571.3Quiescent Supply Current (VCC)ICC
CSL_ and FB_
forced above their
regulation pointsMAX87561.8
Quiescent Supply Current (VDD)IDDCSL_ and FB_ forced above their regulation
points5µA
Shutdown Supply Current (VCC)ON1 = ON2 = GND5µA
Shutdown Supply Current (VDD)ON1 = ON2 = GND5µA
MAIN SMPS CONTROLLERSMAX8716, MAX8717,
MAX87573.2553.375PWM1 Output Voltage in
Fixed ModeVOUT1
VIN = 6V to 26V,
SKIP1 = VCC,
zero to full loadMAX87561.4801.534
MAX8716, MAX8717,
MAX87574.9255.105PWM2 Output Voltage in
Fixed ModeVOUT2
VIN = 6V to 26V,
SKIP2 = VCC,
zero to full loadMAX87561.7731.838
Feedback Voltage in
Adjustable ModeVFB_VIN = 6V to 26V, FB1 or FB2,
duty factor = 20% to 80% (Note 1)0.9871.023V
MAX8716, MAX8717,
MAX87571.05.5Output Voltage Adjust RangeEither SMPS
MAX87561.02.3
FB1, FB2 Fixed-Mode
Threshold VoltageDual Mode comparator1.92.1V
MAX8716/MAX8717/MAX8756/MAX8757
Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, VIN= 12V, FSEL = REF, SKIP_= 0, VON_= VILIM_= VCC = VDD = 5V, TA
= -40°C to +85°C,unless otherwise
noted.) (Note 6)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSMAX8716, MAX8717,
MAX8757170230FSEL = GND
MAX8756215285
FSEL = REF (Note 3)270330
MAX8716, MAX8717,
MAX8757425575
Operating FrequencyfOSC
FSEL = VCC
MAX8756340460
kHz
FSEL = GND97.5
FSEL = REF (Note 3)97.5Maximum Duty FactorDMAX
FSEL = VCC97.5
Minimum On-TimetON(MIN)(Note 4)200ns
CURRENT LIMITILIM_ Adjustment Range0.5VREFV
Current-Limit Threshold (Fixed)VLIMIT_VCSH_ - VCSL _, ILIM_ = VCC (Note 3)4456mV
VILIM_ = 2.00V188212Current-Limit Threshold
(Adjustable)VLIMIT_VCSH_ - VCSL _VILIM_ = 1.00V93107mV
REFERENCE (REF)Reference VoltageVREFVCC = 4.5V to 5.5V, IREF = 01.982.02V
FAULT DETECTIONutp ut O ver vol tag e Tr i p Thr eshol d MAX8716/MAX8717/MAX8756 only1119%
Output Undervoltage-Protection
Trip ThresholdWith respect to error-comparator threshold6575%
PGOOD_ Lower Trip ThresholdWith respect to error-comparator threshold,
hysteresis = 1%-12.5-8.0%
PGOOD_ Output Low VoltageISINK = 4mA0.4V
GATE DRIVERSDH_ Gate-Driver On-ResistanceRDHBST_ - LX_ forced to 5V (Note 5)5Ω
DL_, high state5DL_ Gate-Driver On-Resistance
(Note 5)RDLDL_, low state3Ω
INPUTS AND OUTPUTSON_ Input VoltageRising edge, hysteresis = 225mV1.22.2V
HighVCC -
REF1.72.3Tri-Level Input LogicSKIP1, SKIP2, FSEL
GND0.5
Note 2:When the inductor is in continuous conduction, the output voltage will have a DC regulation level lower than the error-com-
parator threshold by 50% of the ripple. In discontinuous conduction, the output voltage will have a DC regulation level higher
than the error-comparator threshold by 50% of the ripple.
Note 3:Default setting for the MAX8716.
Note 4:Specifications are guaranteed by design, not production tested.
Note 5:Production testing limitations due to package handling require relaxed maximum on-resistance specifications for the thin QFN
package.
MAX8716/MAX8717/MAX8756/MAX8757
Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers3.3V OUTPUT EFFICIENCY
vs. LOAD CURRENT
MAX8716/17/57 toc01
LOAD CURRENT (A)
EFFICIENCY (%)70
VIN = 6V
SKIP
MODE
LOW-
NOISE
MODE
PWM
MODE
3.3V OUTPUT EFFICIENCY
vs. LOAD CURRENT
MAX8716/17/57 toc02
LOAD CURRENT (A)
EFFICIENCY (%)70
VIN = 12V
SKIP
MODE
PWM
MODELOW-
NOISE
MODE
3.3V OUTPUT EFFICIENCY
vs. LOAD CURRENT
MAX8716/17/57 toc03
LOAD CURRENT (A)
EFFICIENCY (%)70
VIN = 20V
SKIP
MODE
PWM
MODELOW-
NOISE
MODE
3.3V OUTPUT VOLTAGE
vs. LOAD CURRENTMAX8716/17/57 toc04
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)321
SKIP
MODE
PWM
MODEVIN = 12V
LOW-
NOISE
MODE
5V OUTPUT EFFICIENCY
vs. LOAD CURRENT
MAX8716/17/57 toc05
LOAD CURRENT (A)
EFFICIENCY (%)70
PWM
MODE
VIN = 6V
LOW-
NOISE
MODE
SKIP
MODE
5V OUTPUT EFFICIENCY
vs. LOAD CURRENT
MAX8716/17/57 toc06
LOAD CURRENT (A)
EFFICIENCY (%)70
VIN = 12V
SKIP
MODE
PWM
MODE
LOW-
NOISE
MODE
5V OUTPUT EFFICIENCY
vs. LOAD CURRENT
MAX8716/17/57 toc07
LOAD CURRENT (A)
EFFICIENCY (%)70
VIN = 20V
SKIP
MODE
PWM
MODE
LOW-
NOISE
MODE
5V OUTPUT VOLTAGE
vs. LOAD CURRENTMAX8716/17/57 toc08
LOAD CURRENT (A)
OUTPUT VOLTAGE (V)132
SKIP
MODE
PWM
MODEVIN = 12V
LOW-
NOISE
MODE
2.5V OUTPUT EFFICIENCY
vs. LOAD CURRENTMAX8716/17/57 toc09
LOAD CURRENT (A)
EFFICIENCY (%)0.10.01
SKIP
MODE
PWM
MODE
VIN = 12V
L = 4.3μH
LOW-NOISE
MODE
Typical Operating Characteristics(Circuit of Figure 1, MAX8717, VIN= 12V, VDD= VCC= 5V, SKIP_= GND, FSEL = REF, TA= +25°C, unless otherwise noted.)
DROPOUT VOLTAGE (V)0.1
OUT2 DROPOUT VOLTAGE
vs. LOAD CURRENT
LOAD CURRENT (A)32105
MAX8716/17/57 toc17
VOUT2 = 4.8V
MAX8716/MAX8717/MAX8756/MAX8757
Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
Typical Operating Characteristics (continued)(Circuit of Figure 1, MAX8717, VIN= 12V, VDD= VCC= 5V, SKIP_= GND, FSEL = REF, TA= +25°C, unless otherwise noted.)
1.8V OUTPUT EFFICIENCY
vs. LOAD CURRENTMAX8716/17/57 toc10
LOAD CURRENT (A)
EFFICIENCY (%)0.10.01
SKIP
MODE
PWM
MODE
VIN = 12V
L = 3.2μH
LOW-NOISE
MODE
NO-LOAD SUPPLY CURRENT vs. INPUT
VOLTAGE (FORCED-PWM MODE)INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)161284
MAX8716/17/57 toc11IBIAS
IIN
SKIP1 = SKIP2 = VCC
ON1 = ON2 = VCC
NO-LOAD SUPPLY CURRENT vs. INPUT
VOLTAGE (IDLE MODE)
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)161284024
MAX8716/17/57 toc12
IBIAS
IIN
SKIP1 = SKIP2 = GND OR REF
ON1 = ON2 = VCC
OUT2 IDLE-MODE CURRENT
vs. INPUT VOLTAGEIDLE-MODE CURRENT (A)
INPUT VOLTAGE (V)161284024
MAX8716/17/57 toc13
MAXIMUM DUTY-
CYCLE LIMITED
SKIP2 = GND
SKIP2 = REF
OUT2 SWITCHING FREQUENCY
vs. LOAD CURRENTLOAD CURRENT (A)
SWITCHING FREQUENCY (kHz)0.10.01
MAX8716/17/57 toc14
SKIP2 = GND
SKIP2 = REF
SKIP2 = VCC
5V OUTPUT VOLTAGE
vs. INPUT VOLTAGEOUTPUT VOLTAGE (V)4.95
INPUT VOLTAGE (V)161284024
MAX8716/17/57 toc15
SKIP2 = VCC
3.3V OUTPUT VOLTAGE
vs. INPUT VOLTAGEOUTPUT VOLTAGE (V)3.30
INPUT VOLTAGE (V)161284024
MAX8716/17/57 toc16
SKIP1 = VCC
STARTUP WAVEFORMSMAX8716/17/57 toc18
400μs/div0
A. LX2, 20V/div
B. ON2, 10V/div
C. PGOOD2, 10V/div
D. REF, 2V/div
E. OUT2, 2V/div
F. ILX2, 2.5AV/div
1.0Ω LOAD ON OUT2
12VA
MAX8716/MAX8717/MAX8756/MAX8757
Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
SHUTDOWN WAVEFORMSMAX8716/17/57 toc19
1ms/div
A. DL2, 10V/div
B. ON2, 10V/div
C. PGOOD2, 10V/div
D. REF, 2V/div
E. OUT2, 2V/div
F. ILX2, 2.5AV/div
1.0kΩ LOAD ON OUT2
SKIP2 = GND
STARTUP WAVEFORMSMAX8716/17/57 toc20
1ms/div
A. ON1/ON2, 5V/div
B. PGOOD1, 10V/div
C. PGOOD2, 10V/div
D. OUT2, 2V/div
E. OUT1, 2V/div
3.3V
VCC UVLO WAVEFORMSMAX8716/17/57 toc21
4ms/div
A. VCC, 2V/div
B. OUT2, 2V/div
C. PGOOD2, 5V/div
D. DL2, 5V/div
E. ILX2, 2.5AV/div
100Ω LOAD ON OUT2
SKIP2 = VCC
STEADY-STATE WAVEFORMSMAX8716/17/57 toc22
2μs/div
A. OUT2, 50mV/div
B. LX2, 10V/div
C. VIN, 50mV/div
D. OUT1, 50mV/div
E. LX1, 10V/div
12V
12V
3.3V
1.0A LOAD ON OUT1, 1.0A LOAD ON OUT2
SKIP1 = VCC, SKIP2 = VCC
Typical Operating Characteristics (continued)(Circuit of Figure 1, MAX8717, VIN= 12V, VDD= VCC= 5V, SKIP_= GND, FSEL = REF, TA= +25°C, unless otherwise noted.)
DROPOUT WAVEFORMSMAX8716/17/57 toc23
2μs/div
A. OUT2, 50mV/div
B. LX2, 10V/div
C. VIN, 50mV/div
D. OUT1, 50mV/div
E. LX1, 10V/div
4.9V
3.3V
1.0A LOAD ON OUT1, 1.0A LOAD ON OUT2
SKIP1 = VCC, SKIP2 = VCC
MAX8716/MAX8717/MAX8756/MAX8757
Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
SKIP1 TRANSITIONMAX8716/17/57 toc27
20μs/div
A. SKIP1, 5V/div
B. LX1, 10V/div
C. OUT1, 50mV/div
D. ILX1, 2.5A/div
12V
3.3V
2.5A
30mA LOAD ON OUT1
MAX8756 NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE (FORCED-PWM MODE)MAX8716/17/57 toc28
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)416128
SKIP1 = SKIP2 = VCC
ON1 = ON2 = VCC
IBIAS
IIN
MAX8756 OUT2 IDLE MODE CURRENT
vs. INPUT VOLTAGEMAX8716/17/57 toc30
IDLE MODE CURRENT (mA)416128
SKIP2 = GND
SKIP2 = REF
MAX8756 NO-LOAD SUPPLY CURRENT
vs. INPUT VOLTAGE (IDLE MODE)MAX8716/17/57 toc29
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)416128
ON1 = ON2 = VCC
IBIAS
IIN
SKIP_ = GND
IIN
SKIP_ = REF
OUT1 LOAD TRANSIENTMAX8716/17/57 toc24
20μs/div
A. CONTROL, 5V/div
B. OUT1, 50mV/div
C. ILX1, 3A/div
D. LX1, 10V/div
3.3V
12V
SKIP1 = VCC
SKIP1 TRANSITIONMAX8716/17/57 toc25
20μs/div
A. SKIP1, 5V/div
B. LX1, 10V/div
C. OUT1, 50mV/div
D. ILX1, 2.5A/div
12V
3.3V
2.5A
30mA LOAD ON OUT1
SKIP1 TRANSITIONMAX8716/17/57 toc26
20μs/div
A. SKIP1, 5V/div
B. LX1, 10V/div
C. OUT1, 50mV/div
D. ILX1, 2.5A/div
12V
3.3V
2.5A
30mA LOAD ON OUT1
Typical Operating Characteristics (continued)(Circuit of Figure 1, MAX8717, VIN= 12V, VDD= VCC= 5V, SKIP_= GND, FSEL = REF, TA= +25°C, unless otherwise noted.)
MAX8716/MAX8717/MAX8756/MAX8757
Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
Pin Description
PIN
MAX8716
MAX8717/
MAX8756/
MAX8757
NAMEFUNCTION 1 1 VCC Analog Supply Input. Connect to the system supply voltage (+4.5V to +5.5V) through a
series 20 resistor. Bypass VCC to AGND with a 1μF or greater ceramic capacitor.
2 2 SKIP1
Low-Noise Mode Control for SMPS1. Connect SKIP1 to GND for normal Idle Mode
(pulse-skipping) operation or to VCC for PWM mode (fixed frequency). Connect to REF
for low-noise mode.
3 3 REF
2.0V Reference Voltage Output. Bypass REF to AGND with a 0.1μF or greater ceramic
capacitor. The reference can source up to 50μA. Loading REF degrades output voltage
accuracy according to the REF load-regulation error (see the Typical Operating
Characteristics). The reference shuts down when both ON1 and ON2 are low.
4 4 SKIP2
Low-Noise Mode Control for SMPS2. Connect SKIP2 to GND for normal Idle Mode
(pulse-skipping) operation or to VCC for PWM mode (fixed frequency). Connect to REF
for low-noise mode. Frequency Select Input. This four-level logic input sets the controller’s switching
frequency.
FSEL MAX8717/MAX8757 (kHz) MAX8756 (kHz) — VCC 500 400
REF 300 300
5 FSEL
GND 200 250
5 6 ON1 SMPS1 Enable Input. Drive ON1 high to enable SMPS1. Drive ON1 low to shut down
SMPS1.
6 7 ON2 SMPS2 Enable Input. Drive ON2 high to enable SMPS2. Drive ON2 low to shut down
SMPS2.
— 8 ILIM2
SMPS2 Peak Current-Limit Threshold Adjustment. Connect ILIM2 to VCC to enable the
default 50mV current-limit threshold. In adjustable mode, the current-limit threshold across
CSH2 and CSL2 is precisely 1/10 the voltage seen at ILIM2 over a 500mV to 2.0V range.
The logic threshold for switchover to the 50mV default value is approximately VCC - 1V.
7 9 PGOOD2 SMPS2 Open-Drain Power-Good Output. PGOOD2 is low when SMPS2 is more than 10%
below its regulation threshold, during soft-start, and in shutdown.
8 10 FB2
Feedback Input for SMPS2. Connect FB2 to VCC for fixed 5V output for the
MAX8716/MAX8717/MAX8757, or a fixed 1.8V for the MAX8756. In adjustable mode,
FB2 regulates to 1V.
9 11 CSL2 Negative Current-Sense Input for SMPS2. Connect to the negative terminal of the
current-sense element. Figure 8describes two different current-sensing options.
10 12 CSH2 Positive Current-Sense Input for SMPS2. Connect to the positive terminal of the current-
sense element. Figure 8describes two different current-sensing options.
11 13 BST2
Boost Flying Capacitor Connection for SMPS2. Connect to an external capacitor and
diode as shown in Figure 1. An optional resistor in series with BST2 allows the DH2
turn-on current to be adjusted.
12 14 DH2 High-Side Gate-Driver Output for SMPS2. DH2 swings from LX2 to BST2.
13 15 LX2 Inductor Connection for SMPS2. Connect LX2 to the switched side of the inductor. LX2
MAX8716/MAX8717/MAX8756/MAX8757
Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
Detailed DescriptionThe MAX8716/MAX8717/MAX8756/MAX8757 Standard
Application Circuit(Figure 1) generates the 5V/5A and
3.3V/5A typical of the main supplies in notebook com-
puters. The input supply range is 6V to 24V. See Table 1
for component selections, while Table 2 lists the compo-
nent manufacturers.
The MAX8716/MAX8717/MAX8756/MAX8757 contain
two interleaved fixed-frequency, step-down controllers
designed for low-voltage power supplies. The optimal
interleaved architecture guarantees out-of-phase oper-
ation, which reduces the input capacitor ripple.
SMPS 5V Bias Supply (VCCand VDD)The MAX8716/MAX8717/MAX8756/MAX8757 switch-
mode power supplies (SMPS) require a 5V bias supply
in addition to the high-power input supply (battery or
AC adapter). VDDis the power rail for the MOSFET gate
drive, and VCCis the power rail for the IC. Connect the
external 4.5V to 5.5V supply directly to VDDand con-
nect VDDto VCCthrough an RC filter, as shown in
Figure 1. The maximum supply current required is:
IBIAS= ICC+ fSW(QG(NL1)+ QG1(NH1)+QG2(NL2)+
QG2(NH2)) = 1.3mA to 40mA
where ICCis 1.3mA, fSWis the switching frequency,
and QG_are the MOSFET data sheet’s total gate-
Pin Description (continued)
PIN
MAX8716
MAX8717/
MAX8756/
MAX8757
NAMEFUNCTION16DL2Low-Side Gate-Driver Output for SMPS2. DL2 swings from PGND to VDD.17VDDSupply Voltage Input for the DL_ Gate Drivers. Connect to a 5V supply.—GNDPower and Analog Ground. Connect backside pad to GND.18PGNDPower Ground19AGNDAnalog Ground. Connect backside pad to AGND.20DL1Low-Side Gate-Driver Output for SMPS1. DL1 swings from PGND to VDD.21LX1Inductor Connection for SMPS1. Connect LX1 to the switched side of the inductor. LX1
is the lower supply rail for the DH1 high-side gate driver.22DH1High-Side Gate-Driver Output for SMPS1. DH1 swings from LX1 to BST1.23BST1
Boost Flying Capacitor Connection for SMPS1. Connect to an external capacitor and
diode as shown in Figure 1. An optional resistor in series with BST1 allows the DH1 turn-
on current to be adjusted.24CSH1Positive Current-Sense Input for SMPS1. Connect to the positive terminal of the current-
sense element. Figure 8 describes two different current-sensing options.25CSL1Negative Current-Sense Input for SMPS1. Connect to the negative terminal of the
current-sense element. Figure 8 describes two different current-sensing options.26FB1
Feedback Input for SMPS1. Connect FB1 to VCC for fixed 3.3V output for the
MAX8716/MAX8717/MAX8757, or a fixed 1.5V for the MAX8756. In adjustable mode,
FB1 regulates to 1V.27PGOOD1SMPS1 Open-Drain Power-Good Output. PGOOD1 is low when SMPS1 is more than
10% below its regulation threshold, during soft-start, and in shutdown.28ILIM1
SMPS1 Peak Current-Limit Threshold Adjustment. Connect ILIM1 to VCC to enable the
default 50mV current-limit threshold. In adjustable mode, the current-limit threshold
across CSH1 and CSL1 is precisely 1/10 the voltage seen at ILIM1 over a 500mV to
2.0V range. The logic threshold for switchover to the 50mV default value is
approximately VCC - 1V.EPEPExposed Pad. Connect exposed backside pad to analog ground.
MAX8716/MAX8717/MAX8756/MAX8757
Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook ComputersVDD
DH1
BST1
DL1
LX1
CSH1
CBST2
0.1μF
NH2
DL2
RCS2
7mΩ
5.7μH
COUT2
150μF
+5V BIAS
POWER-GOOD 1
POWER-GOOD 2
NL2
CBST1
0.1μF
NH1
NL1
RCS1
7mΩ
COUT1
220μF
DL1L1
5.7μH
DBST1DBST2
1μF
+5V BIAS
3.3V PWM
OUTPUT
(1.5V FOR MAX8756)
INPUT (VIN)
SEE TABLE 1 FOR COMPONENT SPECIFICATIONS.
FB1
POWER GROUND
ANALOG GROUND
MAX8716
MAX8717
MAX8756
MAX8757
CIN
(2) 10μF
REF (300kHz)
SKIP1
SKIP2
ILIM1
ILIM2
BST2
LX2
DL2
*PGND
*AGND
CSH2
CSL2
FB2
DH2
CSL1
DEFAULT
CURRENT
LIMIT
ON1
ON2OFF
5V PWM
OUTPUT
(1.8V FOR MAX8756)
VCC
PGOOD1
20Ω
1μFR2
100kΩ
PGOOD2
FSEL
REF
100kΩ
VCC
PULSE-
SKIPPING
CONTROL
VCC
VCC
VCC
CREF
0.22μF
MAX8717/MAX8756/MAX8757 ONLY
*FOR THE MAX8716 AGND AND PGND,
REFER TO A SINGLE
PIN DESIGNATED GND.
Figure 1. Standard Application Circuit
MAX8716/MAX8717/MAX8756/MAX8757
Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
Reference (REF)The 2V reference is accurate to ±1.5% over tempera-
ture and load, making REF useful as a precision system
reference. Bypass REF to GND with a 0.1µF or greater
ceramic capacitor. The reference sources up to 50µA
and sinks 10µA to support external loads.
SMPS Detailed DescriptionPower-on reset (POR) occurs when VCCrises above
approximately 2V, resetting the undervoltage, overvolt-
age, and thermal-shutdown fault latches. The POR cir-
cuit also ensures that the low-side drivers are driven
high until the SMPS controllers are activated. The VCC
input undervoltage-lockout (UVLO) circuitry inhibits
switching if VCCis below the VCCUVLO threshold.
An internal soft-start gradually increases the regulation
voltage during startup to reduce the input surge cur-
rents (see the Startup Waveforms in the Typical
Operating Characteristics).
COMPONENTMAX8716/MAX8717/MAX8757
5V/5A, 3.3V/5A, 300kHz
MAX8716/MAX8717/MAX8757
5V/5A, 3.3V/5A, 500kHz
MAX8756
1.8V/5A, 1.5V/5A, 300kHzInput VoltageVIN = 7V to 24VVIN = 7V to 24VVIN = 7V to 24V
CIN, Input Capacitor(2) 10µF, 25V
Taiyo Yuden TMK432BJ106KM
(2) 10µF, 25V
Taiyo Yuden TMK432BJ106KM
(2) 10µF, 25V
Taiyo Yuden TMK432BJ106KM
COUT1, Output Capacitor
220µF, 4V, 25mΩ
low-ESR capacitor,
SANYO 4TPE220M
150µF, 4V, 25mΩ
low-ESR capacitor,
SANYO 4TPE150M
220µF, 4V, 18mΩ
low-ESR capacitor,
SANYO 4TPE220MIC2
COUT2, Output Capacitor
150µF, 6.3V, 25mΩ
low-ESR capacitor,
SANYO 6TPE150M
100µF, 6.3V, 25mΩ
low-ESR capacitor,
SANYO 6TPE100M
220µF, 4V, 18mΩ
low-ESR capacitor,
SANYO 4TPE220MIC2
NH_ High-Side MOSFET
Fairchild Semiconductor
FDS6612A
International Rectifier
IRF7807V
Fairchild Semiconductor
FDS6612A
International Rectifier
IRF7807V
Fairchild Semiconductor
FDS6612A
International Rectifier
IRF7807V
NL_ Low-Side MOSFET
Fairchild Semiconductor
FDS6670S
International Rectifier
IRF7807VD1
Fairchild Semiconductor
FDS6670S
International Rectifier
IRF7807VD1
Fairchild Semiconductor
FDS6670S
International Rectifier
IRF7807VD1
DL_ Schottky Rectifier
(if needed)
Nihon EC21QS03L
2A, 30V, 0.45Vf
Nihon EC21QS03L
2A, 30V, 0.45Vf
Nihon EC21QS03L
2A, 30V, 0.45Vf
L_ Inductor5.7µH
Sumida CDEP105-5R7NC
3.9µH
Sumida CDRH124-3R9NC
3.1µH
Sumida CDRH125-3R1NC
RSENSE_
7mΩ ±1% 0.5W resistor
IRC LR2010-01-R007F or
Dale WSL-2010-R007F
7mΩ ±1% 0.5W resistor
IRC LR2010-01-R007F or
Dale WSL-2010-R007F
7mΩ ±1% 0.5W resistor
IRC LR2010-01-R007F or
Dale WSL-2010-R007F
Table 1. Component Selection for Standard Applications
SUPPLIERWEBSITEAVXwww.avx.com
Central Semiconductorwww.centralsemi.com
Coilcraftwww.coilcraft.com
Coiltronicswww.coiltronics.com
Fairchild Semiconductorwww.fairchildsemi.com
International Rectifierwww.irf.com
KEMETwww.kemet.com
Panasonicwww.panasonic.com/industrial
SANYOwww.secc.co.jp
Sumidawww.sumida.com
Taiyo Yudenwww.t-yuden.com
TDKwww.component.tdk.com
TOKOwww.tokoam.com
Vishay (Dale, Siliconix)www.vishay.com
Table 2. Component Suppliers
MAX8716/MAX8717/MAX8756/MAX8757
Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
SMPS Enable Controls (ON1, ON2)ON1 and ON2 provide independent control of output
soft-start and soft-shutdown. This allows flexible control
of startup and shutdown sequencing. The outputs can
be started simultaneously, sequentially, or indepen-
dently. To provide sequential startup, connect ON_ of
one regulator to PGOOD_ of the other. For example,
with ON1 connected to PGOOD2, OUT1 soft-starts after
OUT2 is in regulation. Drive ON_ low to clear the over-
voltage, undervoltage, and thermal fault latches.
Soft-Start and Soft-ShutdownSoft-start begins when ON_ is driven high and REF is in
regulation. During soft-start, the output is ramped up
from 0V to the final set voltage in 2ms. This reduces
inrush current and provides a predictable ramp-up time
for power sequencing.
Soft-shutdown begins after ON_ goes low, an output
undervoltage fault occurs, or a thermal fault occurs.
The two outputs are independent. A fault at one output
does not trigger shutdown of the other. During soft-
shutdown the output is ramped down to 0V in 4ms,
reducing negative inductor currents that can cause
negative voltages on the output. At the end of soft-shut-
down, DL_ is driven high until startup is again triggered
by a rising edge of ON_. The reference is turned off
when both outputs have been shut down.
FB1
DH1
BST1
DL1
LX1
PWM1
CONTROLLER
(FIGURE 3)
PGND
DECODE
(FIGURE 5)
FSEL
ILIM1
CSH1
CSL1
PGOOD1POWER-GOOD AND
FAULT PROTECTION
(FIGURE 7)
INTERNAL FBFAUL
OSC
MAX8717/MAX8756/MAX8757VCC
REF
2.0V
REFGND
FB2
DH2
BST2
DL2
VDD
LX2
PWM2
CONTROLLER
(FIGURE 3)
DECODE
(FIGURE 5)
ILIM2
CSH2
CSL2
PGOOD2POWER-GOOD AND
FAULT PROTECTION
(FIGURE 7)
INTERNAL FBFAUL
SKIP1
ON1
SKIP2
ON2
VDD
Figure 2. Functional Diagram
