MAX17031ETG+ ,Dual Quick-PWM, Step-Down Controller with Low-Power LDO and RTC Regulator for MAIN SuppliesFeaturesThe MAX17031 is a dual Quick-PWM™ step-down ♦ Dual Quick-PWMpower-supply (SMPS) controller ..
MAX17036GTL+ ,1/2/3-Phase Quick-PWM IMVP-6.5 VID ControllersMAX17030/MAX1703619-4577; Rev 1; 8/091/2/3-Phase Quick-PWMIMVP-6.5 VID Controllers
MAX17036GTL+T ,1/2/3-Phase Quick-PWM IMVP-6.5 VID ControllersFeatures♦ Triple/Dual-Phase Quick-PWM ControllersThe MAX17030/MAX17036 are 3/2-phase interleavedQui ..
MAX17039GTN+ ,Dual-Output, 3-Phase + 1-Phase Quick-PWM Controller for VR12/IMVP7FeaturesThe MAX17039 is a dual-output, step-down, constant- S Supports all Required IMVP-7 Function ..
MAX17039GTN+T ,Dual-Output, 3-Phase + 1-Phase Quick-PWM Controller for VR12/IMVP7features detect a fault, the controller shuts down both channels.S Accurate Droop and Current Limit ..
MAX1703ESE ,1-Cell to 3-Cell / High-Power 1.5A / Low-Noise / Step-Up DC-DC ConverterApplicationsMAX848/MAX849.Digital Cordless Phones Personal CommunicatorsThe MAX1703 evaluation kit ..
MAX4522CEE ,Quad / Low-Voltage / SPST Analog SwitchesApplications______________Ordering InformationBattery-Operated EquipmentPART TEMP. RANGE PIN-PACKAG ..
MAX4522CEE+ ,Quad, Low-Voltage SPST Analog SwitchesMAX4521/MAX4522/MAX452319-1136; Rev 3; 10/01Quad, Low-Voltage, SPST Analog Switches
MAX4522CPE ,Quad / Low-Voltage / SPST Analog SwitchesELECTRICAL CHARACTERISTICS—Dual Supplies(V+ = +4.5V to +5.5V, V- = -4.5V to -5.5V, T = T to T , unl ..
MAX4522CSE ,Quad / Low-Voltage / SPST Analog SwitchesFeaturesThe MAX4521/MAX4522/MAX4523 are quad, low-volt-' +2V to +12V Single Supplyage, single-pole/ ..
MAX4522CSE ,Quad / Low-Voltage / SPST Analog SwitchesApplications______________Ordering InformationBattery-Operated EquipmentPART TEMP. RANGE PIN-PACKAG ..
MAX4522CUE ,Quad, Low-Voltage SPST Analog SwitchesApplicationsMAX4521CPE 0°C to +70°C 16 Plastic DIPBattery-Operated EquipmentMAX4521CSE 0°C to +70°C ..
MAX17031ETG+
Dual Quick-PWM, Step-Down Controller with Low-Power LDO and RTC Regulator for MAIN Supplies
General DescriptionThe MAX17031 is a dual Quick-PWM™ step-down
power-supply (SMPS) controller with synchronous recti-
fication, 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 valley current-limit protection. Combined with
the output overvoltage and undervoltage protection fea-
tures, this current limit ensures robust output supplies.
The 5V/3.3V SMPS outputs can save power by operat-
ing in pulse-skipping mode or in ultrasonic mode to
avoid audible noise. Ultrasonic mode forces the con-
troller to maintain switching frequencies greater than
20kHz at light loads. The SKIP input also has an accu-
rate logic threshold, allowing it to be used as a sec-
ondary feedback input to refresh an external charge
pump or secondary winding without overcharging the
output voltages.
An internal 100mA linear regulator generates the 5V
bias needed for power-up or other low-power “always-
on” suspend supplies. An internal bypass circuitry
allows automatic bypassing of the linear regulator when
the 5V SMPS is active.
The device includes independent shutdown controls
with well-defined logic thresholds 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 peri-
od. 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. A
combined power-good (PGOOD) output simplifies the
interface with external controllers. The MAX17031 is
available in a 24-pin thin QFN (4mm x 4mm) package.
ApplicationsNotebook Computers
Ultra-Mobile PC
Main System Supply (5V and 3.3V Supplies)
2 to 4 Li+ Cells Battery-Powered Devices
Telecommunication
FeaturesDual Quick-PWMPreset 5V and 3.3V OutputsInternal 100mA, 5V Linear RegulatorInternal OUT1 LDO5 Bypass SwitchSecondary Feedback (SKIP Input) Maintains
Charge Pump3.3V, 5mA Real-Time Clock (RTC) Power (Always
On)2V ±1% 50µA Reference6V to 24V Input RangePulse-Skipping/Forced-PWM/Ultrasonic Mode
ControlIndependent SMPS and LDO5 Enable ControlsCombined SMPS PGOOD OutputsMinimal Component Count
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies*EXPOSED PAD.
*EP
ONLDO
RTC
LDO5
REF
DL2V
DL1BST2BST1
SKIP618161413
OUT2
ILIM2
ON1
PGOOD
ILIM1
OUT1
MAX17031
GND
ON211DH1DH212LX1LX2
THIN QFN4mm × 4mmTOP VIEW
Pin Configuration
Ordering Information19-4305; Rev 0; 10/08
EVALUATION KIT
AVAILABLE+Denotes a lead-free/RoHS-compliant package.
*EP = Exposed pad.
PARTTEMP RANGEPIN-PACKAGEMAX17031ETG+ -40°C to +85°C 24 TQFN-EP*
Quick-PWM is a trademark of Maxim Integrated Products, Inc.
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= VSKIP= 5V, ONLDO = RTC, 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 to GND...............................................................-0.3V to +28V
VDD, VCCto GND.....................................................-0.3V to +6V
RTC, LDO5, ONLDO to GND...................................-0.3V to +6V
OUT2 to GND...........................................................-0.3V to +6V
ON1, ON2, PGOOD to GND.....................................-0.3V to +6V
OUT1 to GND..........................................-0.3V to (VLDO5+ 0.3V)
SKIP to GND...............................................-0.3V to (VCC+ 0.3V)
REF, ILIM1, ILIM2 to GND..........................-0.3V to (VCC+ 0.3V)
DL_ to GND................................................-0.3V to (VDD+ 0.3V)
BST_ to GND..........................................................-0.3V to +36V
BST_ to VDD............................................................-0.3V to +30V
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
LDO5, RTC, REF Short Circuit to GND.......................Momentary
RTC Current Continuous.....................................................+5mA
LDO5 Current (Internal Regulator) Continuous..............+100mA
LDO5 Current (Switched Over) Continuous...................+200mA
Continuous Power Dissipation (TA= +70°C)
24-Pin, 4mm x 4mm Thin QFN (T2444-3)
(derate 27.8mW/°C above +70°C).................................2.22W
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 Input Voltage Range LDO5 in regulation 6 24 V
IN Standby Supply Current VIN = 6V to 24V, ON1 = ON2 = GND,
ONLDO = RTC 85 175 µA
IN Shutdown Supply Current VIN = 4.5V to 24V,
ON1 = ON2 = ONLDO = GND 40 70 µA
IN Supply Current IINON1 = ON2 = VCC, VSKIP = VCC;
VOUT1 = 5.3V, VOUT2 = 3.5V 0.1 0.2 mA
VCC Bias Supply Current IVCC ON1 = ON2 = VCC, VSKIP = VCC;
VOUT1 = 5.3V, VOUT2 = 3.5V 0.7 1.5 mA
PWM CONTROLLERSOUT1 Output-Voltage Accuracy VOUT1 VSKIP = 1.8V 4.95 5.00 5.05 V
OUT2 Output-Voltage Accuracy VOUT2 VSKIP = 1.8V 3.267 3.30 3.333 V
Either SMPS, VSKIP = 1.8V, ILOAD = 0 to 5A -0.1
Either SMPS, VSKIP = GND, ILOAD = 0 to 5A -1.7 Load Regulation Error
Either SMPS, VSKIP = VCC, ILOAD = 0 to 5A -1.5
Line Regulation Error Either SMPS, IN = 6V to 28V 0.005 %/V
DH1 On-Time tON1 VOUT1 = 5.0V (Note 1) 895 1052 1209 ns
DH2 On-Time tON2 VOUT2 = 3.3V (Note 1) 833 925 1017 ns
Minimum Off-Time tOFF(MIN) (Note 1) 300 400 ns
Soft-Start Slew Rate tSSRising/falling edge on ON1 or ON2 1 ms
Ultrasonic Operating Frequency fSW(USONIC) VSKIP = GND 20 34 kHz
Note:Measurements are valid using a 20MHz bandwidth limit.
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
LINEAR REGULATOR (LDO5)LDO5 Output-Voltage Accuracy VLDO5 VIN = 6V to 24V, ON1 = GND,
0 < ILDO5 < 100mA 4.90 5.0 5.10 V
LDO5 Short-Circuit Current LDO5 = GND 100 260 mA
Falling edge of OUT1 -11.0 -8.8 -6.0 LDO5 Regulation Reduction/
Bootstrap Switchover Threshold Rising edge of OUT1 -7.0
LDO5 Bootstrap Switch Resistance LDO5 to OUT1, VOUT1 = 5V (Note 3) 1.9 4.5
Falling edge of VCC, PWM disabled
below this threshold 3.8 4.0 4.3 VCC Undervoltage Lockout
Threshold
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 3.19 3.47
RTC Short-Circuit Current RTC = GND 5 22 mA
REFERENCE (REF)Reference Voltage VREF VCC = 4.5V to 5.5V, IREF = 0 1.980 2.00 2.020 V
Reference Load Regulation Error VREF IREF = -20µA to +50µA -10 +10 mV
REF Lockout Voltage VREF(UVLO) Rising edge, 350mV (typ) hysteresis 1.95 V
OUT1 FAULT DETECTION OUT1 Overvoltage and PGOOD
Trip Threshold With respect to error comparator threshold 10 13 16 %
OUT1 Overvoltage Fault
Propagation Delay tOVP OUT1 forced 50mV above trip threshold 10 µs
OUT1 Undervoltage Protection
Trip Threshold With respect to error comparator threshold 65 70 75 %
OUT1 Output Undervoltage
Fault Propagation Delay tUVP 10 µs
OUT2 FAULT DETECTION OUT2 Overvoltage and PGOOD
Trip Threshold With respect to error comparator threshold 10 13 16 %
OUT2 Overvoltage Fault
Propagation Delay tOVP OUT2 forced 50mV above trip threshold 10 µs
OUT2 Undervoltage Protection
Trip Threshold With respect to error comparator threshold 65 70 75 %
OUT2 Output Undervoltage Fault
Propagation Delay tUVP 10 µs
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= VSKIP= 5V, ONLDO = RTC, ON1 = ON2
= VCC, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= VSKIP= 5V, ONLDO = RTC, ON1 = ON2
= VCC, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
POWER-GOODPGOOD Lower Trip Threshold With respect to either error comparator
threshold, falling edge, hysteresis = 1% -16 -13 -10 %
PGOOD Propagation Delay tPGOOD OUT1 or OUT2 forced 50mV beyond
PGOOD trip threshold, falling edge 10 µs
PGOOD Output Low Voltage ON1 or ON2 = GND (PGOOD low
impedance), ISINK = 4mA 0.3 V
PGOOD Leakage Current IPGOOD
OUT1 and OUT2 in regulation (PGOOD
high impedance), PGOOD forced to 5.5V,
TA = +25°C 1 µA
CURRENT LIMITILIM_ Adjustment Range 0.2 2 V
ILIM_ Current 5 µA
RILIM_ = 100k
(VILIM_ = 500mV) 44 50 56
RILIM_ = 200k
(VILIM_ = 1.00V) 90 100 110 Valley Current-Limit Threshold
(Adjustable) VLIM_ (VAL) VAGND - VLX_
RILIM_ = 400k
(VILIM_ = 2.00V) 180 200 220
mV
Current-Limit Threshold
(Negative) VNEG With respect to valley current-limit
threshold, VSKIP = VREF -120 %
Ultrasonic Current-Limit Threshold VNEG(US) VOUT2 = 3.5V, VOUT1 = 5.3V 20mV
Current-Limit Threshold
(Zero Crossing) VZX VAGND - VLX_,
VSKIP = VCC or GND 1.5 mV
GATE DRIVERSDH_ Gate-Driver On-Resistance RDHBST1 - LX1 and BST2 - LX2 forced to 5V 1.5 3.5
DL1, DL2; high state 1.4 4.5 DL_ Gate-Driver On-Resistance RDL DL1, DL2; low state 0.5 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
DL1, DL2 rising (Note 4) 30 Dead Time tDEADDH1, DH2 rising (Note 4) 35 ns
Internal BST_ Switch
On-Resistance RBST IBST_ = 10mA, VDD = 5V 5.5
BST_Leakage Current VBST_ = 26V, TA = +25°C;
OUT1 and OUT2 above regulation threshold 0.1 5 µA
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= VSKIP= 5V, ONLDO = RTC, ON1 = ON2
= VCC, TA
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
INPUTS AND OUTPUTSUpper SKIP/PWM threshold falling edge,
33mV hysteresis 1.94 2.0 2.06 SKIP Input Thresholds
Lower PWM/ultrasonic threshold 0.4 1.6
SKIP Leakage Current VSKIP = 0 or 5V, TA = +25°C -1 +1 µA
High (SMPS on) 2.4 ON_ Input-Logic Levels ONLDO, ON1, ON2 Low (SMPS off) 0.8 V
ON_ Leakage Current VON1 = VON2 = VONLDO = 0 or 5V,
TA = +25°C -2 +2 µA
VOUT1 = 5.3V 1565OUT_ Leakage Current VON1 = VON2 = VCCVOUT2 = 3.5V 530µA
ELECTRICAL CHARACTERISTICS(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= VSKIP= 5V, ONLDO = RTC, ON1 = ON2
= VCC, TA
= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
INPUT SUPPLIES IN Input Voltage Range LDO5 in regulation 6 24 V
IN Standby Supply Current VIN = 6V to 24V, ON1 = ON2 = GND,
ONLDO = RTC 200 µA
IN Shutdown Supply Current VIN = 4.5V to 24V,
ON1 = ON2 = ONLDO = GND 70 µA
IN Supply Current IINON1 = ON2 = VCC, VSKIP = VCC,
VOUT1 = 5.3V, VOUT2 = 3.5V 0.2 mA
VCC Bias Supply Current IVCC ON1 = ON2 = VCC, VSKIP = VCC,
VOUT1 = 5.3V, VOUT2 = 3.5V 1.5 mA
PWM CONTROLLERSOUT1 Output-Voltage Accuracy VOUT1 VSKIP = 1.8V 4.90 5.10 V
OUT2 Output-Voltage Accuracy VOUT2 VSKIP = 1.8V 3.234 3.366 V
DH1 On-Time tON1 VOUT1 = 5.0V (Note 1) 895 1209 ns
DH2 On-Time tON2 VOUT2 = 3.3V (Note 1) 833 1017 ns
Minimum Off-Time tOFF(MIN) (Note 1) 400 ns
Ultrasonic Operating Frequency fSW(USONIC) VSKIP = GND 18 kHz
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= VSKIP= 5V, ONLDO = RTC, ON1 = ON2
= VCC, TA
= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
LINEAR REGULATOR (LDO5)LDO5 Output-Voltage Accuracy VLDO5 VIN = 6V to 24V, ON1 = GND;
0mA < ILDO5 < 100mA 4.85 5.15 V
LDO5 Short-Circuit Current LDO5 = GND 260 mA
LDO5 Regulation Reduction/
Bootstrap Switchover Threshold Falling edge of OUT1 -12.0 -5.0 %
LDO5 Bootstrap Switch
Resistance LDO5 to OUT1, VOUT1 = 5V (Note 3) 4.5
VCC Undervoltage Lockout
Threshold
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 RTC = GND 5 22 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 DETECTION OUT1 Overvoltage and
PGOOD Trip Threshold With respect to error comparator threshold 10 16 %
OUT1 Undervoltage
Protection Trip Threshold With respect to error comparator threshold 63 77 %
OUT2 FAULT DETECTION OUT2 Overvoltage and
PGOOD Trip Threshold With respect to error comparator threshold 10 16 %
OUT2 Undervoltage
Protection Trip Threshold With respect to error comparator threshold 63 77 %
POWER-GOODPGOOD Lower Trip Threshold With respect to either error comparator
threshold, falling edge, hysteresis = 1% -16 -10 %
PGOOD Output Low Voltage ON1 or ON2 = GND (PGOOD low
impedance), ISINK = 4mA 0.3 V
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 2, no load on LDO5, RTC, OUT1, OUT2, and REF, VIN= 12V, VDD= VCC= VSKIP= 5V, ONLDO = RTC, ON1 = ON2
= VCC, TA
= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS
CURRENT LIMITILIM_ Adjustment Range 0.2 2 V
RILIM_ = 100k
(VILIM_ = 500mV) 40 60
RILIM_ = 200k
(VILIM_ = 1.00V) 85 115 Valley Current-Limit Threshold
(Adjustable) VLIM_ (VAL) VAGND - VLX_
RILIM_ = 400k
(VILIM_ = 2.00V) 164 236
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 OUTPUTSUpper SKIP/PWM threshold falling edge,
33mV hysteresis 1.94 2.06 SKIP Input Thresholds
Lower PWM/ultrasonic threshold 0.4 1.6
High (SMPS on) 2.4 ON_ Input-Logic Levels ONLDO, ON1, ON2 Low (SMPS off) 0.8 V
Note 1:On-time and off-time specifications are measured from 50% point to 50% point at the DH pin with LX = GND, VBST= 5V, and
a 500pF capacitor from DH to LX to simulate external MOSFET gate capacitance. Actual in-circuit times might be different
due to MOSFET switching speeds.
Note 2:Specifications to TA= -40°C are guaranteed by design and not production tested.
Note 3:Specification increased by 1Ωto account for test measurement error.
Note 4:Production tested for functionality only.
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
5V OUTPUT EFFICIENCY
vs. LOAD CURRENTMAX17031 toc01
LOAD CURRENT (A)
EFFICIENCY (%)0.1
SKIP MODE
12V
20V
PWM MODE
5V OUTPUT EFFICIENCY
vs. LOAD CURRENTMAX17031 toc02
LOAD CURRENT (A)
EFFICIENCY (%)0.1
SKIP MODE
12V INPUT
ULTRASONIC MODE
PWM MODE
3.3V OUTPUT EFFICIENCY
vs. LOAD CURRENTMAX17031 toc03
LOAD CURRENT (A)
EFFICIENCY (%)0.1
SKIP MODE
12V
20V
PWM MODE
3.3V OUTPUT EFFICIENCY
vs. LOAD CURRENTMAX17031 toc04
LOAD CURRENT (A)
EFFICIENCY (%)0.1
SKIP MODE
12V INPUT
ULTRASONIC MODE
PWM MODE
SMPS OUTPUT-VOLTAGE DEVIATION
vs. LOAD CURRENTMAX17031 toc05
LOAD CURRENT (A)
OUTPUT-VOLTAGE DEVIATION (%)0.1
SKIP MODE
12V INPUT
LOW-NOISE
ULTRASONIC MODE
PWM MODE
SWITCHING FREQUENCY
vs. LOAD CURRENTMAX17031 toc06
LOAD CURRENT (A)
SWITCHING FREQUENCY (kHz)0.1
SKIP MODE
12V INPUT
LOW-NOISE
ULTRASONIC MODE
PWM MODE
5V LDO OUTPUT VOLTAGE
vs. LOAD CURRENTMAX17031 toc07
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
3.3V RTC OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX17031 toc08
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
NO-LOAD INPUT SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX17031 toc09
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)51015
SKIP MODE
ICC + IDD
LOW-NOISE
ULTRASONIC MODE
PWM MODE
Typical Operating Characteristics(Circuit of Figure 1, VIN= 12V, VDD= VCC= 5V, TA= +25°C, unless otherwise noted.)
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
STANDBY AND SHUTDOWN INPUT
SUPPLY CURRENT vs. INPUT VOLTAGEMAX17031 toc10
INPUT VOLTAGE (V)
SUPPLY CURRENT (mA)51015
ICC + IDD
STANDBY
(ONLDO = RTC, ON1 = ON2 = GND)
SHUTDOWN
(ONLDO = ON1 = ON2 = GND)
REFERENCE OFFSET
VOLTAGE DISTRIBUTIONMAX17031 toc11
2V OFFSET VOLTAGE (mV)
SAMPLE PERCENTAGE (%)-12-44
TA = +85°C
TA = +25°CSAMPLE SIZE = 150
100mV ILIM THRESHOLD
VOLTAGE DISTRIBUTIONMAX17031 toc12
ILIM THRESHOLD VOLTAGE (mV)
SAMPLE PERCENTAGE (%)
SAMPLE SIZE = 150TA = +85°C
TA = +25°C
LDO AND RTC POWER-UPMAX17031 toc13
A. INPUT SUPPLY, 5V/div
B. 5V LDO, 2V/div
C. 3.3V RTC, 2V/div
D. 1.0 REF, 1V/div
200µs/div
12VA
12V
3.3V
2.0V
LDO AND RTC POWER REMOVALMAX17031 toc14
A. INPUT SUPPLY, 5V/div
B. 5V LDO, 2V/div
C. 3.3V RTC, 2V/div
D. 2.0 REF, 1V/div
200µs/div
3.3V
12V
12V3.3V
2.0V
5V LDO LOAD TRANSIENTMAX17031 toc15
A. LDO OUTPUT, 100mV/div
B. LDO CURRENT, 100mA/div
4µs/div
0.1A
5V SMPS STARTUP AND SHUTDOWNMAX17031 toc16
A. 5V LDO OUTPUT, 0.2V/div
C. ON1, 5V/div
200µs/div
C. PGOOD, 5V/div
STARTUP WAVEFORMS
(SWITCHING REGULATORS)MAX17031 toc17
A. ON1, 5V/div
200μs/div
SKIP MODE
C. PGOOD, 2V/div
SHUTDOWN WAVEFORMS
(SWITCHING REGULATORS)MAX17031 toc18
A. ON1, 5V/div
200µs/divA
Typical Operating Characteristics (continued)(Circuit of Figure 1, VIN= 12V, VDD= VCC= 5V, TA= +25°C, unless otherwise noted.)
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
Pin Description
Typical Operating Characteristics (continued)(Circuit of Figure 1, VIN= 12V, VDD= VCC= 5V, TA= +25°C, unless otherwise noted.)
PINNAMEFUNCTION1 REF
2V Reference Voltage Output. Bypass REF to analog ground with a 0.22µF 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 Typical Operating Characteristics).
The reference shuts down when ON1, ON2, and ONLDO are all pulled low.
2 ONLDO
Enable Input for LDO5. Drive ONLDO high (pull up to RTC) to enable the linear regulator (LDO5)
output. Drive ONLDO low to shut down the linear regulator output.When ONLDO is high, LDO5
must supply VCC and VDD.
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 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 up to 5mA for external loads.
5 IN
Power Input Supply. Bypass IN with a 0.1µF or greater ceramic capacitor to GND. IN powers the
linear regulators (RTC and LDO5) and senses the input voltage for the Quick-PWM on-time one-
shot timer. The DH on-time is inversely proportional to input voltage.
6 LDO5 5V Linear Regulator Output. Bypass LDO5 with a 4.7µF or greater ceramic capacitor to GND. LDO5
can source 100mA for external load support. LDO5 is powered from IN.
7 OUT1
Output-Voltage Sense Input for SMPS1 and Linear Regulator Bypass Input. OUT1 is an input to the
Quick-PWM on-time one-shot timer. OUT1 also serves as the feedback input for the SMPS1.
When OUT1 exceeds 93.5% of the LDO5 voltage, the controller bypasses the LDO5 output to
OUT1. The bypass switch is disabled if the OUT1 voltage drops by 8.5% from LDO5 nominal
regulation threshold.
8 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.
C. INDUCTOR CURRENT,
2A/div
5V SMPS LOAD TRANSIENT
(1A TO 4A)MAX17031 toc19
A. LOAD CURRENT, 2A/div
B. 5V SMPS OUTPUT,
100mV/div
40µs/div
C. INDUCTOR CURRENT,
2A/div
3.3V SMPS LOAD TRANSIENT
(1A TO 4A)MAX17031 toc20
A. LOAD CURRENT, 2A/div
B. 3.3V SMPS OUTPUT,
100mV/div
40µs/div
3.3V
C. 5V SMPS, 2V/div
D. PGOOD, 5V/div
POWER REMOVAL
(SMPS UVLO RESPONSE)MAX17031 toc21
A. INPUT VOLTAGE, 5V/div
B. 5V LDO OUTPUT, 2V/div
10ms/div
12V
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN Supplies
Pin Description (continued)
PINNAMEFUNCTION9 PGOOD
Open-Drain Power-Good Output for SMPS1 and SMPS2. PGOOD is low when either output voltage is
more than 15% (typ) below the nominal regulation threshold, during soft-start, in shutdown, when
either SMPS is disabled, and after the fault latch has been tripped. After the soft-start circuit has terminated, PGOOD becomes high impedance if both outputs are in regulation.
10 ON1 Enable Input for SMPS1. Drive ON1 high to enable SMPS1. Drive ON1 low to shut down SMPS1.
11 DH1 High-Side Gate-Driver Output for SMPS1. DH1 swings from LX1 to BST1.
12 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.
13 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.
14 DL1 Low-Side Gate-Driver Output for SMPS1. DL1 swings from power GND to VDD.
15 VDD
Supply Voltage Input for the DL_ Gate Drivers. VDD is internally connected to the drain of the HVPV
BST diode switch. Connect to a 5V supply, and bypass VDD to power GND with a 1µF or greater
ceramic capacitor.
16 GND Analog and Power Ground
17 DL2 Low-Side Gate-Driver Output for SMPS2. DL2 swings from power GND to VDD.
18 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.
19 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.
20 DH2 High-Side Gate-Driver Output for SMPS2. DH2 swings from LX2 to BST2.
21 ON2 Enable Input for SMPS2. Drive ON2 high to enable SMPS2. Drive ON2 low to shut down SMPS2.
22 SKIP
Pulse-Skipping Control Input. This three-level input determines the operating mode for the
switching regulators:
High (> 2V) = pulse-skipping mode
Middle (1.8V) = forced-PWM mode
GND = ultrasonic mode
23 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.
24 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. EP Exposed Pad. Connect backside exposed pad to analog GND and power GND.
MAX17031
Dual Quick-PWM Step-Down Controller with Low-
Power LDO and RTC Regulator for MAIN SuppliesMAX17031
NH1DH1
NL1DL1
LDO5
VDD
SKIP
DX1
BST1
OUT1
LX1
PGOOD
RTC
REF
GND
0.1μF
0.1μF
10nF
1MΩ
100kΩ
0.1μF
CBST1
0.1μF
4.7μF
COUT1
CIN_PIN
0.1μF
5V OUTPUT
5V LDO OUTPUT
POWER GROUND
ANALOG GROUND
12V TO 15V
CHARGE PUMP
VCC
ILIM1
DX2C7
10nF
ON1
ON2
ONLDO
ILIM2PAD
NH2DH2
NL2DL2D2
BST2
OUT2
LX2
CBST2
0.1μF
COUT2
3.3V OUTPUT
INPUT (VIN)*
7V TO 24V
COMBINED POWER-GOOD
RTC SUPPLY
200kΩ
47Ω
1.0μF
RILIM1RILIM2
1μF
CIN
4x 10μF
25V
ON OFF
*NOTE: LOWER INPUT VOLTAGES REQUIRE ADDITIONAL INPUT CAPACITANCE. IF OPERATING NEAR DROPOUT, COMPONENT SELECTION MUST BE
CAREFULLY DONE TO ENSURE PROPER OPERATION.
Figure 1. Standard Application Circuit—Main Supply
