MAX8734AEEI+ ,High-Efficiency, Quad-Output, Main Power-Supply Controllers for Notebook ComputersFeatures♦ No Current-Sense Resistor Needed (MAX8734A)The MAX8732A/MAX8733A/MAX8734A dual step-down, ..
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MAX8734AEEI+-MAX8734AEEI+T
High-Efficiency, Quad-Output, Main Power-Supply Controllers for Notebook Computers
General DescriptionThe MAX8732A/MAX8733A/MAX8734A dual step-down,
switch-mode power-supply (SMPS) controllers generate
logic-supply voltages in battery-powered systems. The
MAX8732A/MAX8733A/MAX8734A include two pulse-
width modulation (PWM) controllers, adjustable from 2V to
5.5V or fixed at 5V and 3.3V. These devices feature two
linear regulators providing 5V and 3.3V always-on out-
puts. Each linear regulator provides up to 100mA output
current with automatic linear-regulator bootstrapping to
the main SMPS outputs. The MAX8732A/MAX8733A/
MAX8734A include on-board power-up sequencing, a
power-good (PGOOD) output, digital soft-start, and inter-
nal soft-stop output discharge that prevents negative volt-
ages on shutdown. Additionally, the outputs are high
impedance when VCCfalls below its UVLO set point while
the outputs are enabled.
Maxim’s proprietary Quick-PWM™ quick-response, con-
stant on-time PWM control scheme operates without
sense resistors and provides 100ns response to load tran-
sients while maintaining a relatively constant switching fre-
quency. The unique ultrasonic pulse-skipping mode
maintains the switching frequency above 25kHz, which
eliminates noise in audio applications. Other features
include pulse skipping, which maximizes efficiency in
light-load applications, and fixed-frequency PWM mode,
which reduces RF interference in sensitive applications.
The MAX8732A features a 200kHz/5V and 300kHz/3.3V
SMPS for highest efficiency, while the MAX8733A fea-
tures a 400kHz/5V and 500kHz/3.3V SMPS for “thin and
light” applications. The MAX8734A provides a pin-
selectable switching frequency, allowing either 200kHz/
300kHz or 400kHz/500kHz operation of the 5V/3.3V
SMPSs, respectively. The MAX8732A/MAX8733A/
MAX8734A are available in 28-pin QSOP packages and
operate over the extended temperature range
(-40°C to +85°C).
The MAX8732A/MAX8733A/MAX8734A are pin-for-pin
upgrades to the MAX1777/MAX1977/MAX1999.
The MAX1999 evaluation kit (EV kit) can be used to
evaluate the MAX8732A/MAX8733A/MAX8734A.
ApplicationsNotebook and Subnotebook Computers
PDAs and Mobile Communication Devices
3- and 4-Cell Li+ Battery-Powered Devices
FeaturesNo Current-Sense Resistor Needed (MAX8734A)Accurate Current Sense with Current-Sense
Resistor (MAX8732A/MAX8733A)1.5% Output Voltage Accuracy3.3V and 5V 100mA Bootstrapped Linear
RegulatorsInternal Soft-Start and Soft-Stop Output
DischargeQuick-PWM with 100ns Load Step Response3.3V and 5V Fixed or Adjustable Outputs
(Dual Mode™)4.5V to 24V Input Voltage RangeEnhanced Ultrasonic Pulse-Skipping Mode
(25kHz min)Power-Good (PGOOD) SignalOvervoltage Protection Enable/Disable
MAX8732A/MAX8733A/MAX8734A
High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
Ordering Information19-3711; Rev 0; 5/05
PARTTEMP RANGEPIN-
PA CKA GE
5V/3.3V
SWITCHING
FREQUENCY
(kHz)
MAX8732AEEI+-40°C to +85°C28 QSOP200/300
MAX8732AEEI-40°C to +85°C28 QSOP200/300
MAX8733AEEI+-40°C to +85°C28 QSOP400/500
MAX8733AEEI-40°C to +85°C28 QSOP400/500
Quick-PWM and Dual Mode are trademarks of Maxim
Integrated Products, Inc.
Ordering Information continued at end of data sheet.+Denotes lead-free package.
BST3
LX3
DH3
LDO3
DL3
GND
LX5
OUT3
OUT5
DL5
LDO5
VCC
DH5
BST5
TON
ILIM5
FB5
REF
FB3
ILIM3
ON5
ON3
PGOOD
N.C.
QSOPTOP VIEW
MAX8734ASHDN
PRO
SKIP
Pin ConfigurationsPin Configurations continued at end of data sheet.
MAX8732A/MAX8733A/MAX8734A
High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, VSHDN= 5V,
= 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.
V+, SHDNto GND..................................................-0.3V to +25V
BST_ to GND..........................................................-0.3V to +30V
LX_ to BST_..............................................................-6V to +0.3V
CS_ to GND (MAX8732A/MAX8733A only).................-2V to +6V
VCC, LDO5, LDO3, OUT3, OUT5, ON3, ON5, REF,
FB3, FB5, SKIP, PRO, PGOOD to GND...............-0.3V to +6V
DH3 to LX3..............................................-0.3V to (VBST3+ 0.3V)
DH5 to LX5..............................................-0.3V to (VBST5+ 0.3V)
ILIM3, ILIM5 to GND...................................-0.3V to (VCC+ 0.3V)
DL3, DL5 to GND....................................-0.3V to (VLDO5+ 0.3V)
TON to GND (MAX8734A only)................................-0.3V to +6V
LDO3, LDO5, REF Short Circuit to GND....................Momentary
LDO3 Current (internal regulator) Continuous................+100mA
LDO3 Current (switched over to OUT3) Continuous......+200mA
LDO5 Current (internal regulator) Continuous................+100mA
LDO5 Current (switched over to OUT5) Continuous......+200mA
Continuous Power Dissipation (TA= +70°C)
28-Pin QSOP (derate 10.8mW/°C above +70°C).........860mW
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
PARAMETERCONDITIONSMINTYPMAXUNITS
MAIN SMPS CONTROLLERSLDO5 in regulation624V+ Input Voltage RangeV+ = LDO5, VOUT5 < 4.43V4.55.5V
3.3V Output Voltage in
Fixed ModeV+ = 6V to 24V, FB3 = GND, V SKIP = 5V3.2853.3303.375V
V+ = 6V to 24V, FB5 = GND, V SKIP = 5V,
MAX8732A/MAX8734A (TON = VCC)
5V Output Voltage in Fixed Mode
V+ = 7V to 24V, FB5 = GND, V SKIP = 5V,
MAX8733A/MAX8734A (TON = GND)
4.9755.0505.125V
Output Voltage in
Adjustable ModeV+ = 6V to 24V, either SMPS1.9752.002.025V
Output Voltage Adjust RangeEither SMPS2.05.5V
FB3, FB5 Adjustable-Mode
Threshold VoltageDual-Mode comparator0.10.2V
Either SMPS, V SKIP = 5V, 0 to 5A-0.1
Either SMPS, SKIP = GND, 0 to 5A-1.5DC Load Regulation
Either SMPS, V SKIP = 2V, 0 to 5A-1.7
Line RegulationEither SMPS, 6V < V+ < 24V0.005%/V
Current-Limit Threshold
(Positive, Default)
ILIM_ = VCC, GND - CS_ (MAX8732A/MAX8733A),
GND - LX_ (MAX8734A)93100107mV
VILIM_ = 0.5V405060
VILIM_ = 1V93100107Current-Limit Threshold
(Positive, Adjustable)
GND - CS_
(MAX8732A/MAX8733A),
GND - LX_ (MAX8734A)VILIM_ = 2V185200215
Zero-Current ThresholdSKIP = GND, ILIM_ = VCC, GND - CS_
(MAX8732A/MAX8733A), GND - LX_ (MAX8734A)3mV
Current-Limit Threshold
(Negative, Default)
SKIP = ILIM_ = VCC, GND - CS_
(MAX8732A/MAX8733A), GND - LX_ (MAX8734A)-120mV
Soft-Start Ramp TimeZero to full limit1.7ms
MAX8732A/MAX8733A/MAX8734A
High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, VSHDN= 5V,
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETERCONDITIONSMINTYPMAXUNITS5V SMPS200MAX8732A or MAX8734A
(VTON = 5V), SKIP = VCC3.3V SMPS300
5V SMPS400MAX8733A or MAX8734A
(VTON = 0), SKIP = VCC3.3V SMPS500
Operating Frequency
SKIP = REF2536
kHz
VOUT5 = 5.05V1.8952.1052.315MAX8732A or MAX8734A
(VTON = 5V)VOUT3 = 3.33V0.8330.9251.017
VOUT5 = 5.05V0.8951.0521.209On-Time Pulse Width
MAX8733A or MAX8734A
(VTON = 0)VOUT3 = 3.33V0.4750.5550.635
Minimum Off-Time250300350ns
VOUT5 = 5.05V94MAX8732A or MAX8734A
(VTON = 5V)VOUT3 = 3.33V91
VOUT5 = 5.05V88Maximum Duty Cycle
MAX8733A or MAX8734A
(VTON = 0)VOUT3 = 3.33V85
INTERNAL REGULATOR AND REFERENCELDO5 Output VoltageON3 = ON5 = GND, 6V < V+ < 24V, 0 < ILDO5 < 100mA4.905.005.10V
LDO5 Short-Circuit CurrentLDO5 = GND190mA
LDO5 Undervoltage-Lockout
Fault ThresholdFalling edge of LDO5, hysteresis = 1%3.74.04.3V
LDO5 Bootstrap Switch ThresholdFalling edge of OUT5, rising edge at OUT5 regulation
point4.434.564.69V
LDO5 Bootstrap
Switch ResistanceLDO5 to OUT5, VOUT5 = 5V1.43.2Ω
LDO3 Output VoltageON3 = ON5 = GND, 6V < V+ < 24V, 0 < ILDO3 < 100mA3.283.353.42V
LDO3 Short-Circuit CurrentLDO3 = GND180mA
LDO3 Bootstrap Switch ThresholdFalling edge of OUT3, rising edge at OUT3 regulation
point2.802.913.02V
LDO3 Bootstrap Switch
ResistanceLDO3 to OUT3, VOUT3 = 3.2V1.53.5Ω
REF Output VoltageNo external load1.9802.0002.020V
REF Load Regulation0 < ILOAD < 50µA10mV
REF Sink CurrentREF in regulation10µA
V+ Operating Supply CurrentLDO5 switched over to OUT5, 5V SMPS2550µA
V+ Standby Supply CurrentV+ = 6V to 24V, both SMPSs off, includes ISHDN150250µA
V+ Shutdown Supply CurrentV+ = 4.5V to 24V615µA
Quiescent Power ConsumptionBoth SMPSs on, FB3 = FB5 = SKIP = GND, VOUT3 =
3.5V, VOUT5 = 5.3V34.5mW
FAULT DETECTIONOvervoltage Trip ThresholdFB3 or FB5 with respect to nominal regulation point+8+11+14%
MAX8732A/MAX8733A/MAX8734A
High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, VSHDN= 5V,
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETERCONDITIONSMINTYPMAXUNITSOvervoltage Fault
Propagation DelayFB3 or FB5 delay with 50mV overdrive10µs
PGOOD ThresholdFB3 or FB5 with respect to nominal output, falling edge,
typical hysteresis = 1%-12-9.5-7%
PGOOD Propagation DelayFalling edge, 50mV overdrive10µs
PGOOD Output Low VoltageISINK = 4mA0.3V
PGOOD Leakage CurrentHigh state, forced to 5.5V1µA
Thermal-Shutdown Threshold+160oC
Output Undervoltage
Shutdown ThresholdFB3 or FB5 with respect to nominal output voltage657075%
Output Undervoltage
Shutdown Blanking TimeFrom ON_ signal102235ms
INPUTS AND OUTPUTSFeedback Input Leakage CurrentVFB3 = VFB5 = 2.2V-200+40+200nA
Low level0.6PRO Input VoltageHigh level1.5V
Low level0.8
Float level1.72.3SKIP Input Voltage
High level2.4
Low level0.8TON Input VoltageHigh level2.4V
Clear fault level/SMPS off level0.8
Delay start level1.72.3ON3, ON5 Input Voltage
SMPS on level2.4
V PRO or VTON = 0 or 5V-1+1
VON_ = 0 or 5V-2+2
V SKIP = 0 or 5V-1+1
V SHDN = 0 or 24V-1+1
VCS_ = 0 or 5V-2+2
Input Leakage Current
VILIM3, VILIM5 = 0 or 2V-0.2+0.2
Rising edge1.21.62.0SHDN Input Trip LevelFalling edge0.961.001.04V
DH_ Gate-Driver
Sink/Source CurrentDH3, DH5 forced to 2V2A
DL_ Gate-Driver Source CurrentDL3 (source), DL5 (source), forced to 2V1.7A
DL_ Gate-Driver Sink CurrentDL3 (sink), DL5 (sink), forced to 2V3.3A
DH_ Gate-Driver On-ResistanceBST - LX_ forced to 5V1.54.0Ω
DL_, high state (pullup)2.25.0DL_ Gate-Driver On-ResistanceDL_, low state (pulldown)0.61.5Ω
MAX8732A/MAX8733A/MAX8734A
High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
ELECTRICAL CHARACTERISTICS (continued)(Circuit of Figure 1 and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, VSHDN= 5V,
= 0°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.)
PARAMETERCONDITIONSMINTYPMAXUNITSOUT3, OUT5 Discharge-Mode
On-Resistance1240Ω
OUT3, OUT5 Discharge-Mode
Synchronous Rectifier
Turn-On Level
0.20.30.4V
ELECTRICAL CHARACTERISTICS(Circuit of Figure 1and Figure 2, no load on LDO5, LDO3, OUT3, OUT5, and REF, V+ = 12V, ON3 = ON5 = VCC, VSHDN= 5V,
= -40°C to +85°C, unless otherwise noted.) (Note 1)
PARAMETERCONDITIONSMINTYPMAXUNITS
MAIN SMPS CONTROLLERSLDO5 in regulation624V+ Input Voltage RangeV+ = LDO5, VOUT5 < 4.41V4.55.5V
3.3V Output Voltage in
Fixed ModeV+ = 6V to 24V, FB3 = GND, V SKIP = 5V3.273.39V
V+ = 6V to 24V, FB5 = GND, V SKIP = 5V,
MAX8732A/MAX8734A (TON = VCC)5V Output Voltage in Fixed Mode
V+ = 7V to 24V, FB5 = GND, V SKIP = 5V,
MAX8733A/MAX8734A (TON = GND)
4.955.15V
Output Voltage in
Adjustable ModeV+ = 6V to 24V, either SMPS1.972.03V
Output Voltage Adjust RangeEither SMPS2.05.5V
FB3, FB5 Adjustable-Mode
Threshold VoltageDual-Mode comparator0.10.2V
Current-Limit Threshold
(Positive, Default)
ILIM_ = VCC, GND - CS_ (MAX8732A/MAX8733A),
GND - LX_ (MAX8734A)90110mV
VILIM_ = 0.5V4060
VILIM_ = 1V90110Current-Limit Threshold
(Positive, Adjustable)
GND - CS_
(MAX8732A/MAX8733A),
GND - LX_ (MAX8734A)VILIM_ = 2V180220
VOUT5 = 5.05V1.8952.315MAX8732A or MAX8734A
(VTON = 5V)VOUT3 = 3.33V0.8331.017
VOUT5 = 5.05V0.8951.209On-Time Pulse Width
MAX8733A or MAX8734A
(VTON = 0)VOUT3 = 3.33V0.4750.635
Minimum Off-Time200400ns
INTERNAL REGULATOR AND REFERENCELDO5 Output VoltageON3 = ON5 = GND, 6V < V+ < 24V, 0 < ILDO5 < 100mA4.905.10V
LDO5 Undervoltage-Lockout
Fault ThresholdFalling edge of LDO5, hysteresis = 1%3.74.3V
