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MAX17101ETJ+
Dual Quick-PWM, Step-Down Controller with Low-Power LDO, RTC Regulator
MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
Ordering Information19-4243; Rev 1; 2/09
General DescriptionThe MAX17101 is a dual Quick-PWM™ step-down
power-supply (SMPS) controller with synchronous rectifi-
cation, intended for main 5V/3.3V power generation in
battery-powered systems. Low-side MOSFET sensing
provides a simple low-cost, highly efficient current sense
for providing valley current-limit protection. Combined
with the output overvoltage and undervoltage protection
features, this current limit ensures robust output supplies.
The 5V/3.3V SMPS outputs can save power by operating
in pulse-skipping mode or in ultrasonic mode to avoid
audible noise. Ultrasonic mode forces the controller to
maintain switching frequencies greater than 20kHz at
light loads.
An internal 100mA linear regulator can be used to
either generate the 5V bias needed for power-up or
other lower power “always-on” suspend supplies. An
independent bypass input allows automatic bypassing
of the linear regulator when the SMPS is active.
This main controller also includes a secondary feed-
back input that triggers an ultrasonic pulse (DL1 turned
on) if the SECFB voltage drops below its threshold volt-
age. This refreshes an external charge pump driven by
DL1 without overcharging the output voltage.
The device includes independent shutdown controls to
simplify power-up and power-down sequencing. To
prevent current surges at startup, the internal voltage
target is slowly ramped up from zero to the final target
over a 1ms period. To prevent the output from ringing
below ground in shutdown, the internal voltage target
is ramped down from its previous value to zero over a
1ms period. Two independent power-good outputs
simplify the interface with external controllers.
The MAX17101 comes in a lead-free 32-pin TQFN
(5mm x 5mm) package and operates in the -40°C to
+85°C temperature range.
Features
Applications+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
PARTTEMP RANGEPIN-PACKAGEMAX17101ETJ+-40°C to +85°C32 Thin QFN-EP*
Dual Quick-PWMInternal 100mA 5V or Adjustable Linear RegulatorIndependent LDO Bypass InputInternal Boost DiodesSecondary Feedback Input Maintains Charge Pump3.3V 5mA RTC Power (Always On)OUT1: 5V or 1.5V Fixed or 0.7V Adjustable
FeedbackOUT2: 3.3V or 1.05V Fixed or Dynamic AdjustableDynamic 0 to 2V REFIN2 Input on Second Output2V ±1% 50µA Reference6V to 24V Input Range (28V max)Ultrasonic ModeIndependent SMPS and LDO Enable ControlsIndependent SMPS Power-Good OutputsMinimal Component CountNotebook Computers
Main System Supply (5V and 3.3V Supplies)
Graphic Cards
DDR1, DDR2, DDR3 Power Supplies
Game Consoles
Low-Power I/O and Chipset Supplies
Two to Four Li+ Cells Battery-Powered Devices
PDAs and Mobile Communicators
Telecommunication
MAX17101
THIN QFNTOP VIEW
A "+" SIGN FIRST-PIN INDICATOR DENOTES A LEAD-FREE PACKAGE.
TON
ONLDO
LDO
REF
DL2AGNDSECFBBST2V
DL1
PGOOD2672422201918
SKIP
OUT2
ON1
PGOOD1
ILIM1
FB1
PGND10ILIM2OUT19REFIN2+BYP
ON215DH1DH216LX1
LDOSEL
BST1
LX2
Pin Configuration
EVALUATION KIT
AVAILABLE
MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= VSECFB= 5V, VREFIN2= 1.0V, BYP =
LDOSEL = GND, ONLDO = IN, ON1 = ON2 = VCC, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
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.
IN, ONLDO to GND................................................-0.3V to +28V
VDD, VCCto GND.....................................................-0.3V to +6V
RTC, LDO to GND....................................................-0.3V to +6V
OUT_ to GND...........................................................-0.3V to +6V
ON1, ON2 to GND....................................................-0.3V to +6V
PGOOD_ to GND........................................-0.3V to (VCC+ 0.3V)
REF, ILIM_, TON, SKIPto GND..................-0.3V to (VCC+ 0.3V)
FB1, REFIN2, LDOSEL to GND................................-0.3V to +6V
SECFB to GND.........................................................-0.3V to +6V
BYP to GND..............................................-0.3V to (VLDO+ 0.3V)
GND to PGND.......................................................-0.3V to +0.3V
DL_ to PGND..............................................-0.3V to (VDD+ 0.3V)
BST_ to GND..........................................................-0.3V to +34V
BST_ to VDD............................................................-0.3V to +28V
DH1 to LX1..............................................-0.3V to (VBST1+ 0.3V)
BST1 to LX1..............................................................-0.3V to +6V
DH2 to LX2..............................................-0.3V to (VBST2+ 0.3V)
BST2 to LX2..............................................................-0.3V to +6V
LDO, RTC, REF Short Circuit to GND.........................Momentary
RTC Current Continuous.....................................................+5mA
LDO Current (Internal Regulator)
Continuous..................................................................+100mA
LDO Current (Switched Over) Continuous.....................+200mA
Continuous Power Dissipation (TA= +70°C)
32-Pin 5mm x 5mm TQFN
(derate 34.5mW/°C above +70°C).................................2.76W
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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
INPUT SUPPLIESIN Standby Supply Current IIN(STBY) VIN = 6V to 24V, ON1 = ON2 = GND,
ONLDO = VCC 85 175 μA
IN Shutdown Supply Current IIN(SHDN) VIN = 4.5V to 24V,
ON1 = ON2 = ONLDO = GND 50 70 μA
IN Supply Current IIN
ON1 = ON2 = REFIN2 = VCC,
SKIP = FB1 = GND,
VOUT2 = 3.5V, VOUT1 = 5.3V
0.1 0.2 mA
VCC Supply Current ICC
ON1 = ON2 = REFIN2 = VCC,
SKIP = FB1 = GND,
VOUT2 = 3.5V, VOUT1 = 5.3V
1.0 1.5 mA
PWM CONTROLLERS5V preset output: FB1 = GND,
VIN = 12V, SKIP = VCC4.925 5.00 5.075
VOUT1
1.5V preset output: FB1 = VCC (5V),
VIN = 12V, SKIP = VCC1.482 1.50 1.518 OUT1 Output-Voltage Accuracy
(Note 1)
VFB1Adjustable feedback output,
VIN = 12V, SKIP = VCC0.690 0.700 0.710
OUT1 Voltage-Adjust Range 0.7 5.5 V
Low 0.04 0.110
FB1 Dual Mode™ Threshold
Voltage Levels High VCC -
1.6V
VCC -
0.7V
FB1 Input Bias Current IFB1 VFB1 = 0.8V, TA = +25°C -0.2 +0.2 μA
MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= VSECFB= 5V, VREFIN2= 1.0V, BYP =
LDOSEL = GND, ONLDO = IN, ON1 = ON2 = VCC, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS3.3V preset output: REFIN2 = VCC (5V),
VIN = 12V, SKIP = VCC3.255 3.30 3.345
1.05V preset output: REFIN2 = RTC (3.3V),
VIN = 12V, SKIP = VCC1.038 1.050 1.062 OUT2 Output-Voltage Accuracy
(Note 1) VOUT2
Tracking output: VREFIN2 = 1.1V,
VIN = 12V, SKIP = VCC1.09 1.10 1.11
OUT2 Voltage-Adjust Range 0.8 2.0 V
REFIN2 Voltage-Adjust Range 0 2 V
VREFIN2 = 2.2V, TA = +25°C -0.1 +0.1 REFIN2 Input Bias Current IREFIN2 VREFIN2 = 0V, TA = +25°C -0.5 +0.1 μA
Low (REFIN2 = RTC) 2.2 3.0 REFIN2 Dual Mode Threshold
Voltage Levels High (REFIN2 = VCC)VCC -
1.0V
VCC -
0.4V
Either SMPS, SKIP = VCC, ILOAD = 0 to 5A -0.1
Either SMPS, SKIP = REF, ILOAD = 0 to 5A -1.7 Load Regulation Error
Either SMPS, SKIP = GND, ILOAD = 0 to 5A -1.5
Line Regulation Error Either SMPS, VIN = 6V to 24V 0.005 %/V
TON = GND or REF
(400kHz) 895 1052 1209 DH1 On-Time tON1
VIN = 12V,
VOUT1 = 5.0V
(Note 2) TON = VCC (200kHz) 2105
ns
TON = GND (500kHz) 555
DH2 On-Time tON2
VIN = 12V,
VOUT2 = 3.3V
(Note 2)
TON = REF or VCC
(300kHz) 833 925 1017 ns
Minimum Off-Time tOFF(MIN) (Note 2) 300 400 ns
Soft-Start/Stop Slew Rate tSSRising/falling edge on ON1 or ON2 (preset) 1 ms
Soft-Start/Stop Slew Rate tSSRising/falling edge on ON2 (REFIN2 ADJ) 1 mV/μs
Dynamic REFIN2 Slew Rate tDYN Rising edge on REFIN2 8 mV/μs
Ultrasonic Operating Frequency fSW(USONIC) SKIP = open (REF) 20 27 kHz
SECFB Threshold Voltage VSECFB 1.94 2.0 2.06 V
SECFB Input Bias Current ISECFB VSECFB = 2.2V, TA = +25°C -0.2 +0.2 μA
LINEAR REGULATOR (LDO)VIN = 24V, LDOSEL = BYP = GND,
0 < ILDO < 100mA 4.90 5.0 5.10
LDO Output-Voltage Accuracy VLDO VIN = 24V, LDOSEL = VCC, BYP = GND,
0 < ILDO < 100mA 3.23 3.3 3.37
LDOSEL low 0.1 0.15 0.2 LDOSEL Dual Mode Threshold
Voltage Levels LDOSEL high VCC -
0.9V
MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= VSECFB= 5V, VREFIN2= 1.0V, BYP =
LDOSEL = GND, ONLDO = IN, ON1 = ON2 = VCC, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSLDO Short-Circuit Current IILIM(LDO) LDO = GND 100 260 mA
LDO Regulation Reduction/
Bypass Switchover Threshold
With respect to the LDO voltage,
falling edge of BYP-11.0 -8.5 -6.0 %
LDO Bypass Switchover
Threshold
With respect to the LDO voltage,
rising edge of BYP -6.5 %
LDO Bypass Switchover
Startup Timeout tBYP Rising edge of BYP to bypass gate pulled
low 500 μs
LDO Bypass Switch Resistance LDO to BYP, VBYP = 5V (Note 4) 1.2 4.5
Falling edge of VCC,
PWM disabled below this threshold 3.8 4.0 4.3 VCC Undervoltage-Lockout
(UVLO) Threshold VUVLO(VCC)
Rising edge of VCC 4.2
Thermal-Shutdown Threshold TSHDN Hysteresis = 10°C +160 °C
3.3V ALWAYS-ON LINEAR REGULATOR (RTC)ON1 = ON2 = GND, VIN = 6V to 24V,
0 < IRTC < 5mA 3.23 3.33 3.43
RTC Output-Voltage Accuracy VRTC
ON1 = ON2 = ONLDO = GND,
VIN = 6V to 24V, 0 < IRTC < 5mA 3.16 3.50
RTC Short-Circuit Current IILIM(RTC) RTC = GND 5 mA
REFERENCE (REF)Reference Voltage VREF VCC = 4.5V to 5.5V, IREF = 0 1.980 2.00 2.020 V
Reference Load Regulation VREF IREF = -20μA to +50μA -10 +10 mV
REF Lockout Voltage VREF(UVLO) Rising edge, 350mV (typ) hysteresis 1.95 V
OUT1 FAULT DETECTIONOUT1 Overvoltage Trip
Threshold VOVP(OUT1) With respect to error-comparator threshold 12 16 20 %
OUT1 Overvoltage
Fault-Propagation Delay tOVP FB1 forced 50mV above trip threshold 10 μs
OUT1 Undervoltage Protection
Trip Threshold VUVP(OUT1) With respect to error-comparator threshold 65 70 75 %
OUT1 Output-Undervoltage
Fault-Propagation Delay tUVP 10 μs
PGOOD1 Lower Trip Threshold With respect to error-comparator threshold,
falling edge, hysteresis = 1% -20 -16 -12 %
PGOOD1 Propagation Delay tPGOOD1 FB1 forced 50mV beyond PGOOD1 trip
threshold, falling edge 10 μs
PGOOD1 Output Low Voltage VFB1 = 0.56V (PGOOD1 low impedance),
ISINK = 4mA 0.3 V
PGOOD1 Leakage Current IPGOOD1 VFB1 = 0.70V (PGOOD1 high impedance),
PGOOD1 forced to 5.5V 1 μA
MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= VSECFB= 5V, VREFIN2= 1.0V, BYP =
LDOSEL = GND, ONLDO = IN, ON1 = ON2 = VCC, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
OUT2 FAULT DETECTIONWith respect to error-comparator threshold 12 16 20 % OUT2 Overvoltage Trip
Threshold VOVP(OUT2)Minimum overvoltage threshold 0.7 V
OUT2 Overvoltage
Fault-Propagation Delay tOVP OUT2 forced 50mV above trip threshold 10 μs
OUT2 Undervoltage Protection
Trip Threshold VUVP(OUT2) With respect to error-comparator threshold 65 70 75 %
OUT2 Overvoltage
Fault-Propagation Delay tOVP OUT2 forced 50mV above trip threshold 10 μs
OUT2 Output Undervoltage
Fault-Propagation Delay tUVP OUT2 forced 50mV below trip threshold 10 μs
PGOOD2 Lower Trip Threshold With respect to error-comparator threshold,
falling edge, hysteresis = 2% -20 -16 -12 %
PGOOD2 Propagation Delay tPGOOD2 OUT2 forced 50mV beyond PGOOD1 trip
threshold, falling edge 10 μs
PGOOD2 Output-Low Voltage VOUT2 = VREFIN2 - 150mV (PGOOD2 low
impedance), ISINK = 4mA 0.3 V
PGOOD2 Leakage Current IPGOOD2 OUT2 = REFIN2 (PGOOD2 high impedance),
PGOOD2 forced to 5.5V, TA = +25°C 1 μA
CURRENT LIMITILIM_ Adjustment Range VILIM 0.2 2.0 V
ILIM_ Current IILIM 5 μA
RILIM_ = 100k 40 50 60 Valley Current-Limit Threshold
(Adjustable) VVALLEY VAGND - VLX_RILIM_ = 200k 87 100 113 mV
Current-Limit Threshold
(Negative) VNEG With respect to valley current-limit threshold,
SKIP = VCC -120 %
Ultrasonic Current-Limit
Threshold VNEG(US) VOUT1 = VOUT2 = VFB1 = 0.77V, VREFIN2 = 0.70V 25 mV
Current-Limit Threshold
(Zero Crossing) VZX VAGND - VLX_, SKIP = GND or OPEN/REF 1 mV
MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= VSECFB= 5V, VREFIN2= 1.0V, BYP =
LDOSEL = GND, ONLDO = IN, ON1 = ON2 = VCC, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
GATE DRIVERSDH_ Gate Driver On-Resistance RDHBST1 - LX1 and BST2 - LX2 forced to 5V 1.5 3.5
DL1, DL2; high state 2.2 4.5 DL_ Gate Driver On-Resistance RDL DL1, DL2; low state 0.6 1.5
DH_ Gate Driver Source/Sink
Current IDH DH1, DH2 forced to 2.5V,
BST1 - LX1 and BST2 - LX2 forced to 5V 2 A
DL_ Gate Driver Source Current IDL
(SOURCE) DL1, DL2 forced to 2.5V 1.7 A
DL_ Gate Driver Sink Current IDL (SINK) DL1, DL2 forced to 2.5V 3.3 A
Internal BST_ Switch
On-Resistance RBST IBST_ = 10mA, VDD = 5V 5
INPUTS AND OUTPUTSHigh VCC -
0.4V
REF or open 1.6 3.0 TON Input Logic Levels
Low 0.4
High (forced PWM) VCC -
0.4V
Open (ultrasonic) 1.6 3.0 SKIP Input Logic Levels
Low (SKIP) 0.4
SKIP, TON Leakage Current ISKIP,ITON VSKIP = VTON = 0 or 5V, TA = +25°C -2 +2 μA
High (SMPS on) 2.4 ON_ Input Logic Levels Low (SMPS off) 0.8 V
ON_ Leakage Current ION_ VON1 = VON2 = 0 or 5V, TA = +25°C -2 +2 μA
High (SMPS on) 2.4 ONLDO Input Logic Levels Low (SMPS off) 0.8 V
ONLDO Leakage Current IONLDO VONLDO = 0 or 24V, TA = +25°C -1 +1 μA
MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= VSECFB= 5V, VREFIN2= 1.0V, BYP =
LDOSEL = GND, ONLDO = IN, ON1 = ON2 = VCC, TA
= -40°C to +85°C, unless otherwise noted.) (Note 3)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
INPUT SUPPLIESIN Standby Supply Current IIN(STBY) VIN = 6V to 24V, ON1 = ON2 = GND,
ONLDO = VCC 200 μA
IN Shutdown Supply Current IIN(SHDN) VIN = 4.5V to 24V, ON1 = ON2 = ONLDO = GND 70 μA
IN Supply Current IINON1 = ON2 = REFIN2 = VCC,
SKIP = FB1 = GND, VOUT2 = 3.5V, VOUT1 = 5.3V 0.2 mA
VCC Supply Current ICCON1 = ON2 = REFIN2 = VCC,
SKIP = FB1 = GND, VOUT2 = 3.5V, VOUT1 = 5.3V 1.5 mA
PWM CONTROLLERS5V preset output: FB1 = GND,
VIN = 12V, SKIP = VCC4.90 5.10
VOUT1 1.5V preset output: FB1 = VCC (5V),
VIN = 12V, SKIP = VCC1.47 1.53 OUT1 Output-Voltage Accuracy
(Note 1)
VFB1Adjustable feedback output,
VIN = 12V, SKIP = VCC0.685 0.715
OUT1 Voltage-Adjust Range 0.7 5.5 V
Low 0.040 0.125 FB1 Dual Mode Threshold
Voltage High VCC -
1.6V
VCC -
0.7V
3.3V preset output: REFIN2 = VCC (5V), VIN =
12V, SKIP = VCC3.234 3.366
1.05V preset output: REFIN2 = RTC (3.3V),
VIN = 1.2V, SKIP = VCC1.029 1.071 OUT2 Output-Voltage Accuracy
(Note 1) VOUT2
Tracking output: VREFIN2 = 1.1V,
VIN = 12V, SKIP = VCC1.085 1.115
OUT2 Voltage-Adjust Range 0 2 V
REFIN2 Voltage-Adjust Range 0 2 V
Low (REFIN2 = RTC) 2.2 3.0 REFIN2 Dual Mode Threshold
Voltage High (REFIN2 = VCC)VCC -
1.2V
VCC -
0.4V
TON = GND or REF
(400kHz) 895 1209
DH1 On-Time tON1 VIN = 12V,
VOUT1 = 5.0V (Note 2) TON = REF or VCC
(300kHz) 833 1017
ns
Minimum Off-Time tOFF(MIN) (Note 2) 450 ns
SECFB Threshold Voltage VSECFB 1.92 2.08 V
MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= VSECFB= 5V, VREFIN2= 1.0V, BYP =
LDOSEL = GND, ONLDO = IN, ON1 = ON2 = VCC, TA
= -40°C to +85°C, unless otherwise noted.) (Note 3)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
LINEAR REGULATOR (LDO)VIN = 24V, LDOSEL = BYP = GND,
0 < ILDO < 100mA 4.85 5.15
LDO Output-Voltage Accuracy VLDO VIN = 24V, LDOSEL = VCC, BYP = GND,
0 < ILDO < 100mA 3.20 3.40
LDOSEL low 0.25
LDOSEL Dual Mode
Voltage Level LDOSEL high VCC -
0.9V
LDO Short-Circuit Current IILIM(LDO) LDO = GND 260 mA
LDO Regulation Reduction/
Bypass Switchover Threshold Falling edge of BYP -12 -5 %
VCC Undervoltage-Lockout
Threshold VUVLO(VCC) Falling edge of VCC,
PWM disabled below this threshold 3.8 4.3 V
3.3V ALWAYS-ON LINEAR REGULATOR (RTC) ON1 = ON2 = GND, VIN = 6V to 24V,
0 < IRTC < 5mA 3.18 3.45
RTC Output-Voltage Accuracy VRTC ON1 = ON2 = ONLDO = GND,
VIN = 6V to 24V, 0 < IRTC < 5mA 3.16 3.50
RTC Short-Circuit Current IILIM(RTC) RTC = GND 5 mA
REFERENCE (REF)Reference Voltage VREF VCC = 4.5V to 5.5V, IREF = 0 1.975 2.025 V
Reference Load-Regulation Error VREF IREF = -20μA to +50μA -10 +10 mV
OUT1 FAULT DETECTIONOUT1 Overvoltage Trip Threshold VOVP(OUT1) With respect to error-comparator threshold 10 20 %
OUT1 Undervoltage-Protection
Trip Threshold VUVP(OUT1) With respect to error-comparator threshold 60 80 %
PGOOD1 Lower Trip Threshold With respect to error-comparator threshold,
falling edge, hysteresis = 1% -20 -10 %
PGOOD1 Output-Low Voltage VFB1 = 0.56V (PGOOD1 low impedance),
ISINK = 4mA 0.4 V
OUT2 FAULT DETECTIONOUT2 Overvoltage Trip Threshold VOVP(OUT2) With respect to error-comparator threshold 10 20 %
MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1, no load on LDO, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= VSECFB= 5V, VREFIN2= 1.0V, BYP =
LDOSEL = GND, ONLDO = IN, ON1 = ON2 = VCC, TA
= -40°C to +85°C, unless otherwise noted.) (Note 3)
PARAMETERSYMBOL CONDITIONSMIN TYP MAX UNITS OUT2 Undervoltage-Protection
Trip Threshold VUVP(OUT2) With respect to error-comparator threshold 60 80 %
PGOOD2 Lower Trip Threshold With respect to error-comparator threshold,
falling edge, hysteresis = 2% -20 -10 %
PGOOD2 Output-Low Voltage VOUT2 = VREFIN2 - 150mV (PGOOD2 low
impedance), ISINK = 4mA 0.4 V
CURRENT LIMITILIM_ Adjustment Range VILIM 0.2 2.0 V
RILIM_ = 100k 40 60 Valley Current-Limit Threshold
(Adjustable) VVALLEY VAGND - VLX_RILIM_ = 200k 85 115 mV
GATE DRIVERSDH_ Gate Driver On-Resistance RDHBST1 - LX1 and BST2 - LX2 forced to 5V 3.5
DL1, DL2; high state 4.5 DL_ Gate Driver On-Resistance RDL DL1, DL2; low state 1.5
INPUTS AND OUTPUTSHigh VCC -
0.4V
REF or open 1.6 3.0 TON Input Logic Levels
Low 0.4
High (forced PWM) VCC -
0.4V
Open (ultrasonic) 1.6 3.0 SKIP Input Logic Levels
Low (skip) 0.4
High (SMPS on) 2.4 ON_ Input Logic Levels Low (SMPS off) 0.8 V
High (SMPS on) 2.4 ONLDO Input Logic Levels Low (SMPS off) 0.8 V
Note 1:DC output accuracy specifications refer to the threshold of the error comparator. When the inductor is in continuous conduc-
tion, the MAX17101 regulates the valley of the output ripple, so the actual DC output voltage is higher than the trip level by
50% of the output ripple voltage. In discontinuous conduction (IOUT< ILOAD(SKIP)), the output voltage has a DC regulation
level higher than the error-comparator threshold by approximately 1.5% due to slope compensation.
Note 2:On-time and off-time specifications are measured from 50% point to 50% point at the DH pin with LX = PGND, VBST= 5V,
and a 500pF capacitor from DH to LX to simulate external MOSFET gate capacitance. Actual in-circuit times might be differ-
ent due to MOSFET switching speeds.
Note 3:Specifications to TA= -40°C are guaranteed by design and not production tested.
Note 4:Specifications increased by 1Ωto account for test measurement error.
MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
5V OUTPUT EFFICIENCY
vs. LOAD CURRENTMAX17101 toc01
LOAD CURRENT (A)
EFFICIENCY (%)0.1
20V
12V
SKIP MODE
PWM MODE
5V OUTPUT EFFICIENCY
vs. LOAD CURRENTMAX17101 toc02
LOAD CURRENT (A)
EFFICIENCY (%)0.1
SKIP MODE
PWM MODE
ULTRASONIC
MODE
12V
3.3V OUTPUT EFFICIENCY
vs. LOAD CURRENTMAX17101 toc03
LOAD CURRENT (A)
EFFICIENCY (%)0.1
20V
12V
5V SMPS ENABLED
SKIP MODE
PWM MODE
3.3V OUTPUT EFFICIENCY
vs. LOAD CURRENTMAX17101 toc04
LOAD CURRENT (A)
EFFICIENCY (%)0.1
SKIP MODE
5V SMPS ENABLED
PWM MODE
ULTRASONIC
MODE
12V
SMPS OUTPUT VOLTAGE DEVIATION
vs. LOAD CURRENTMAX17101 toc05
LOAD CURRENT (A)
OUTPUT VOLTAGE DEVIATION (%)0.1
PWM MODE
12V
LOW-NOISE
ULTRASONIC
SKIP MODE
SWITCHING FREQUENCY
vs. LOAD CURRENTMAX17101 toc06
LOAD CURRENT (A)
SWITCHING FREQUENCY (kHz)0.1
PWM MODE
LOW-NOISE
ULTRASONIC
MODE
SKIP MODE
12V
5V LDO OUTPUT VOLTAGE
vs. LOAD CURRENTMAX17101 toc07
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
3.3V RTC OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX17101 toc08
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)468
NO-LOAD INPUT SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX17101 toc09
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)20510
PWM MODE
LOW-NOISE
ULTRASONIC
SKIP MODE
Typical Operating Characteristics(Circuit of Figure 1, VIN= 12V, VDD= VCC= 5V, TON = REF, TA= +25°C, unless otherwise noted.)
MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
STANDBY AND SHUTDOWN INPUT
SUPPLY CURRENT vs. INPUT VOLTAGEMAX17101 toc10
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)20510
STANDBY (ONLDO = VIN)
SHUTDOWN
(ONLDO = ON1 = ON2 = GND)
LDO AND RTC POWER-UPMAX17101 toc11
200μs/div
A. INPUT SUPPLY, 5V/div
B. 5V LDO, 2V/div12V5V
3.3V2.0V
12V
C. 3.3V RTC, 2V/div
D. 2.0V REF, 1V/div
LDO AND RTC POWER REMOVALMAX17101 toc12
200μs/div
A. INPUT SUPPLY, 5V/div
B. 5V LDO, 2V/div
3.3V12V5V3.3V
2.0V
12V
C. 3.3V RTC, 2V/div
D. 2.0V REF, 1V/div
Typical Operating Characteristics (continued)(Circuit of Figure 1, VIN= 12V, VDD= VCC= 5V, TON = REF, TA= +25°C, unless otherwise noted.)
5V LDO LOAD TRANSIENTMAX17101 toc13
4μs/div
A. LDO OUTPUT,
100mV/div
0.1A
B. LOAD CURRENT,
100mA/div
5V SMPS STARTUP AND SHUTDOWNMAX17101 toc14
200μs/div
A. 5V LDO OUTPUT, 0.2V/div
B. 5V SMPS OUTPUT, 2V/div
C. ON1, 5V/div
STARTUP WAVEFORMS
(SWITCHING REGULATORS)MAX17101 toc15
100μs/div
A. ON1, 2V/div
B. 5V SMPS OUTPUT,
2V/div5V
C. PGOOD1, 5V/div
D. INDUCTOR CURRENT,
5A/div
MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
3.3V SMPS LOAD TRANSIENTMAX17101 toc18
40μs/div
A. LOAD CURRENT, 5A/div
B. 3.3V SMPS OUTPUT, 100mV/div
C. INDUCTOR CURRENT, 5A/div
3.3V
0.5A
6.5A
POWER REMOVAL
(SMPS UVLO RESPONSE)MAX17101 toc19
10ms/div
A. INPUT VOLTAGE, 5V/div
B. 5V LDO OUTPUT, 2V/div
C. 5V SMPS, 2V/div
D. PGOOD1, 5V/div
SHUTDOWN WAVEFORMS
(SWITCHING REGULATORS)MAX17101 toc16
200μs/div
A. ON1, 5V/div
B. 5V SMPS OUTPUT,
2V/div
C. PGOOD1, 2V/div
D. INDUCTOR CURRENT,
5A/div
5V SMPS LOAD TRANSIENT
(PWM MODE)MAX17101 toc17
40μs/div
A. LOAD CURRENT, 2A/div
B. 5V SMPS OUTPUT, 100mV/div
C. INDUCTOR CURRENT, 2A/div
3.1A
Typical Operating Characteristics (continued)(Circuit of Figure 1, VIN= 12V, VDD= VCC= 5V, TON = REF, TA= +25°C, unless otherwise noted.)
MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
Pin Description
PINNAMEFUNCTION1 REF
2V Reference-Voltage Output. Bypass REF to AGND with a 0.1μF or greater ceramic capacitor. The
reference can source up to 50μA for external loads. Loading REF degrades output-voltage accuracy
according to the REF load-regulation error (see the Typical Operating Characteristics). The reference shuts
down when ON1, ON2, and ONLDO are all pulled low.
2 TON
Switching-Frequency Setting Input. Select the OUT1/OUT2 switching frequencies by connecting TON as
follows for:
High (VCC) = 200kHz/300kHz
Open (REF) = 400kHz/300kHz
GND = 400kHz/500kHz
3 VCCAnalog Supply Voltage Input. Connect VCC to the system supply voltage with a series 50 resistor, and
bypass to analog ground using a 1μF or greater ceramic capacitor.
4 ONLDO Enable Input for LDO. Drive ONLDO high to enable the linear regulator (LDO) output. Drive ONLDO low to
shut down the linear regulator output.
5 RTC
3.3V Always-On Linear Regulator Output for RTC Power. Bypass RTC with a 1μF or greater ceramic
capacitor to analog ground. RTC can source at least 5mA for external load support. RTC power-up is
required for controller operation.
6 IN
Power-Input Supply. IN powers the linear regulators (RTC and LDO) and senses the input voltage for the
Quick-PWM on-time one-shot timers. The high-side MOSFET’s on-time is inversely proportional to the input
voltage. Bypass IN with a 0.1μF or greater ceramic capacitor to PGND close to the MAX17101.
7 LDO
Tracking Linear Regulator Output. Bypass LDO with a 4.7μF or greater ceramic capacitor. LDO can source
at least 100mA for external load support. LDO is powered from IN and its regulation threshold is set by
LDOSEL. For preset 5V operation, connect LDOSEL directly to GND. For preset 3.3V operation, connect
LDOSEL directly to VCC. When LDO is used for 5V operation, LDO must supply VCC and VDD.
8 LDOSEL
Input for the Linear Regulator Output Voltage Selection. LDOSEL sets the LDO regulation voltage. Connect
LDOSEL to GND for a fixed 5V linear-regulator output voltage, or connect LDOSEL to VCC for a fixed 3.3V
linear-regulator output voltage.
9 BYP
Linear Regulator Bypass Input. When BYP voltage exceeds 93.5% of the LDO voltage, the controller
bypasses the LDO output to the BYP input. The bypass switch is disabled if the LDO voltage drops by
8.5% from its nominal regulation threshold. When not being used, connect BYP to GND.
10 OUT1 Output Voltage-Sense Input for SMPS1. OUT1 is an input to the Quick-PWM on-time one-shot timer. OUT1 also
serves as the feedback input for the preset 5V (FB1 = GND) and 1.5V (FB1 = VCC) output voltage settings.
11 FB1
Adjustable Feedback Voltage-Sense Connection for SMPS1. Connect FB1 to GND for fixed 5V operation.
Connect FB1 to VCC for fixed 1.5V operation. Connect FB1 to an external resistive voltage-divider from
OUT1 to analog ground to adjust the output voltage between 0.7V and 5.5V.
12 ILIM1
Valley Current-Limit Adjustment for SMPS1. The GND - LX1 current-limit threshold is 1/10 the voltage
present on ILIM1 over a 0.2V to 2V range. An internal 5μA current source allows this voltage to be set with
a single resistor between ILIM1 and analog ground.
13 PGOOD1
Open-Drain Power-Good Output for SMPS1. PGOOD1 is low when the output voltage is more than 16% (typ)
below the nominal regulation threshold, during soft-start, in shutdown, and after the fault latch has been tripped.
After the soft-start circuit has terminated, PGOOD1 becomes high impedance if the output is in regulation.
MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC Regulator
Pin Description (continued)
PINNAMEFUNCTION14 ON1 Enable Input for SMPS1. Drive ON1 high to enable SMPS1. Drive ON1 low to shut down SMPS1.
15 DH1 High-Side Gate-Driver Output for SMPS1. DH1 swings from LX1 to BST1.
16 LX1 Inductor 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.
17 BST1 Boost Flying-Capacitor Connection for SMPS1. Connect to an external capacitor as shown in Figure 1. An
optional resistor in series with BST1 allows the DH1 turn-on current to be adjusted.
18 DL1 Low-Side Gate-Driver Output for SMPS1. DL1 swings from PGND to VDD.
19 VDDSupply-Voltage Input for the DL_ Gate Drivers. Connect to a 5V supply. Also connect to the drain of the
BST diode switch.
20 SECFB
Secondary Feedback Input. The secondary feedback input forces the SMPS1 output into ultrasonic mode
when the SECFB voltage drops below its 2V threshold voltage. This forces DL1 and DH1 to switch,
allowing the system to refresh an external low-power charge pump being driven by DL1 (see Figure 1 for
the Standard Application Circuit—Main Supply). Connect SECFB to VCC (the 5V bias supply) to disable
secondary feedback.
21 AGND Analog Ground. Connect backside exposed pad to AGND.
22 PGND Power Ground
23 DL2 Low-Side Gate-Driver Output for SMPS2. DL2 swings from PGND to VDD.
24 BST2 Boost Flying-Capacitor Connection for SMPS2. Connect to an external capacitor as shown in Figure 1. An
optional resistor in series with BST2 allows the DH2 turn-on current to be adjusted.
25 LX2 Inductor Connection for SMPS2. Connect LX2 to the switched side of the inductor. LX2 is the lower supply
rail for the DH2 high-side gate driver.
26 DH2 High-Side Gate-Driver Output for SMPS2. DH2 swings from LX2 to BST2.
27 ON2 Enable Input for SMPS2. Drive ON2 high to enable SMPS2. Drive ON2 low to shut down SMPS2.
28 PGOOD2
Open-Drain Power-Good Output for SMPS2. PGOOD2 is low when the output voltage is more than 150mV
(typ) below the REFIN2 voltage or more than 16% below the preset voltage, during soft-start, in shutdown,
and when the fault latch has been tripped. After the soft-start circuit has terminated, PGOOD2 becomes
high impedance if the output is in regulation. PGOOD2 is blanked—forced high-impedance state—when a
dynamic REFIN transition is detected. SKIP
Pulse-Skipping Control Input. This three-level input determines the operating mode for the switching
regulators:
High (VCC) = forced-PWM operation
Open/REF (2V) = ultrasonic mode
GND = pulse-skipping mode
30 OUT2 Output Voltage-Sense Input for SMPS2. OUT2 is an input to the Quick-PWM on-time one-shot timer. OUT2
also serves as the feedback input for the preset 3.3V (REFIN2 = VCC) and 1.05V (REFIN2 = RTC).
31 ILIM2
Valley Current-Limit Adjustment for SMPS2. The GND - LX2 current-limit threshold is 1/10 the voltage
present on ILIM2 over a 0.2V to 2V range. An internal 5μA current source allows this voltage to be set with
a single resistor between ILIM2 and analog ground.
32 REFIN2 External Reference Input for SMPS2. REFIN2 sets the feedback-regulation voltage (VOUT2 = VREFIN2).
Connect REFIN2 to RTC for fixed 1.05V operation. Connect REFIN2 to VCC for fixed 3.3V operation. EP Exposed Pad. Connect the backside exposed pad to AGND.
MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC RegulatorFigure 1. Standard Application Circuit—Main Supply
LDO
DH2
BST2
5V LDO OUTPUT
INPUT (VIN)*
7V TO 24V
5V OUTPUTDL2
LX2
PGND
AGND
RGND
POWER-GOOD}
PGOOD1
NL1
NL2
NH1
NH2
CBST1
0.1μF
CBST2
0.1μF
DH1
BST1
DL1
LX1
ON1
ON2OFFON
PGOOD2
100kΩ
100kΩ
COUT1
COUT2
ILIM1
OUT1
FB1
ILIM2
OUT2
REFIN2
ONLDO
RTC
VDD
VCC
PAD
3.3V OUTPUT
12V TO 15V
CHARGE
PUMP
SECFB
BYP
1μF
LDOSEL
REF
0.1μF
TON
XOUT1/OUT2 SWITCHING FREQUENCY
OPEN (REF): 400kHz/300kHz
1.0μF
500kΩ
100kΩ
47Ω
4.7μF
10nF
0.1μF
5V SMPS OUTPUT (OUT1)
0.1μF
RILIM1RILIM2
CIN
4 x 10μF 25V
C22
0.1μF
DX1
DX2
RTC SUPPLY
SKIP
POWER GROUND
ANALOG GROUND
MAX17101
10nF
*LOWER INPUT VOLTAGES REQUIRE
ADDITIONAL INPUT CAPACITANCE. IF
OPERATING NEAR DROPOUT, COMPONENT
SELECTION MUST BE CAREFULLY DONE TO
ENSURE PROPER OPERATION.
PLACE C22 BETWEEN IN AND PGND AS
CLOSE TO THE MAX17101 AS POSSIBLE.
MAX17101
Dual Quick-PWM, Step-Down Controller
with Low-Power LDO, RTC RegulatorFigure 2. Functional Diagram Overview
FB1
REF
DH2
BST2
LX2
VDD
DL2
DH1
BST1
LX1
VDD
DL1
PWM1
CONTROLLER
(FIGURE 3)
PGND
FB SELECT
(PRESET vs. ADJ)
ON1
REFIN2
ON2
ILIM2
OUT2
TON
ILIM1
OUT1
POWER-GOOD
AND FAULT
PROTECTION
AUL
SKIP5V LINEAR
REGULATORLDO
GND
LDO BYPASS
CIRCUITRY
ONLDO
PGOOD1
PGOOD2
VDD
UVLO
UVLO
AUL
3.3V LINEAR
REGULATORRTC
PAD
REF
VDD
BYP
LDOSEL
SECFB
VCC
MAX17101
PWM2
CONTROLLER
(FIGURE 3)
FB SELECT
(PRESET vs. ADJ)
POWER-GOOD
AND FAULT
PROTECTION
