SI786LSG-E3【PDF 1/16 页】IC REG QD BUCK/LINEAR 28SSOP

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Vishay Siliconix

Si786

Document Number: 70189

S-40807-Rev. J, 26-Apr-04

www.vishay.com

Product is End of Life 3/2014

Dual-Output Power-Supply Controller

FEATURES

" Fixed 5 V and 3.3 V Step-down Converters

" Less than 500 礎 Quiescent Current per Converter

" 25 礎 Shutdown Current

" 5.5 V to 30 V Operating Range

DESCRIPTION

The Si786 Dual Controller for Portable Computer Power

Conversion is pin and functionally compatible with the

MAX786 dual-output power supply controller for notebook

computers. The device is designed as a drop-in replacement

for that circuit.

The circuit is a system level integration of two step-down

controllers, micropower 5 V and 3.3 V linear regulators, and

two comparators. The controllers perform high efficiency

conversion of the battery pack energy (typically 12 V) or the

output of an ac to dc wall converter (typically 18 V to 24 V dc)

to 5 V and 3.3 V system supply voltages. The micropower lin-

ear regulator can be used to keep power management and

back-up circuitry alive during the shutdown of the step-down

converters. The comparators can be biased at any voltage

between 2.7 V and the input voltage, simplifying battery mon-

itoring or providing sufficient voltage to enhance the gate of

a low on-resistance N-Channel FET used in switching power

to different zones in the system.

A complete power conversion and management system can

be implemented with the Si786 Dual Controller for Portable

Computer Power Conversion, an inexpensive linear regula-

tor, the Si9140 SMP Controller for High Performance Proces-

sor Power Supplies, five Si4410 N-Channel TrenchFET

?/DIV>

Power MOSFETs, one Si4435 P-Channel TrenchFET Power

MOSFET, and two Si9712 PC Card (PCMCIA) Interface

Switches.

The Si9130 Pin-Programmable Dual Controller for Portable

PCs is another integrated system level devices for portable

PC power systems.

The Si786 is available in both standard and lead (Pb)-free

28-pin SSOP packages and specified to operate over the

(0癈 to 70 癈), (- 10 癈 to 90 癈) and (- 40 癈 to 85 癈) tem-

perature ranges. See Ordering Information for corresponding

part numbers.

FUNCTIONAL BLOCK DIAGRAM

Si786

SHUTDOWN

5 V ON/OFF

3.3 V ON/OFF

SYNC

Power

Section

3.3 V

5 V

礟

Memory

Peripherals

Power-Good

Low-Battery Warning

5.5. V

30 V

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