Service Manuals, User Guides, Schematic Diagrams or docs for : . Electronic Components Datasheets Various MAX8734 - High-Efficiency, Quad-Output, Main Power-Supply Controllers for Notebook Computers

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MAX8734 - High-Efficiency, Quad-Output, Main Power-Supply Controllers for Notebook Computers


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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



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