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19-3355; Rev 0; 8/04
High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
General Description Features
MAX8732/MAX8733/MAX8734
The MAX8732/MAX8733/MAX8734 dual step-down, No Current-Sense Resistor Needed (MAX8734)
switch-mode power-supply (SMPS) controllers generate Accurate Current Sense with Current-Sense
logic-supply voltages in battery-powered systems. The Resistor (MAX8732/MAX8733)
MAX8732/MAX8733/MAX8734 include two pulse-width
modulation (PWM) controllers, adjustable from 2V to 5.5V 1.5% Output Voltage Accuracy
or fixed at 5V and 3.3V. These devices feature two linear 3.3V and 5V 100mA Bootstrapped Linear
regulators providing 5V and 3.3V always-on outputs. Each Regulators
linear regulator provides up to 100mA output current with Internal Soft-Start and Soft-Stop Output
automatic linear-regulator bootstrapping to the main Discharge
SMPS outputs. The MAX8732/MAX8733/MAX8734 include
on-board power-up sequencing, a power-good (PGOOD) Quick-PWM with 100ns Load Step Response
output, digital soft-start, and internal soft-stop output dis- 3.3V and 5V Fixed or Adjustable Outputs
charge that prevents negative voltages on shutdown. (Dual ModeTM)
Maxim's proprietary Quick-PWMTM quick-response, con- 4.5V to 24V Input Voltage Range
stant on-time PWM control scheme operates without Enhanced Ultrasonic Pulse-Skipping Mode
sense resistors and provides 100ns response to load tran- (25kHz min)
sients while maintaining a relatively constant switching fre-
quency. The unique ultrasonic pulse-skipping mode Power-Good (PGOOD) Signal
maintains the switching frequency above 25kHz, which Overvoltage Protection Enable/Disable
eliminates noise in audio applications. Other features
include pulse skipping, which maximizes efficiency in Ordering Information
light-load applications, and fixed-frequency PWM mode,
5V/3V
which reduces RF interference in sensitive applications. PIN-
PART TEMP RANGE SWITCHING
The MAX8732 features a 200kHz/5V and 300kHz/3.3V PACKAGE
FREQUENCY
SMPS for highest efficiency, while the MAX8733 features MAX8732EEI -40