MAX786S Просмотр технического описания (PDF) - Maxim Integrated

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MAX786S

Dual-Output Power-Supply Controller for Notebook Computers

Maxim Integrated 

Dual-Output Power-Supply

Controller for Notebook Computers

A synchronous rectifier at LX3 keeps efficiency high by

clamping the voltage across the rectifier diode.

Maximum current limit is set by an external low-value

sense resistor, which prevents excessive inductor cur-

rent during start-up or under short-circuit conditions.

Programmable soft-start is set by an optional external

capacitor; this reduces in-rush surge currents upon

start-up and provides adjustable power-up times for

power-supply sequencing purposes.

+5V LDO

V+

LINEAR

P

REGULATOR

VL

5V

REF

SHDN

3.3V

+3.3V

REFERENCE

ON

GND

4V

SYNC

2.8V

300kHz/200kHz

OSCILLATOR ON

STANDBY

3.3V

PWM

CONTROLLER

(SEE FIG. 3)

4.5V

ON

FAULT

5V

PWM

CONTROLLER

(SEE FIG. 3)

ON

FB3

CS3

BST3

DH3

LX3

DL3

SS3

PGND

ON3

FB5

CS5

BST5

DH5

LX5

DL5

SS5

ON5

D1

VH

Q1

1.65V

D2

Q2

1.65V

Figure 2. MAX786 Block Diagram

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