Si9136

Vishay Siliconix

Document Number: 70818

S-00583—Rev. C, 03-Apr-00

www.vishay.com

S FaxBack 408-970-5600

1

Multi-Output Power-Supply Controller

FEATURES

D Up to 95% Efficiency

D 3% Total Regulation (Each Controller)

D 5.5-V to 30-V Input Voltage Range

D 3.3-V, 5-V, and 12-V Outputs

D 200-kHz Low-Noise Fixed Frequency Operation

D Precision 3.3-V Reference Output

D 30 mA Linear Regulator Output

D High Efficiency Pulse Skipping Mode Operation at

Light Load

D Only Three Inductors RequiredNo Transformer

D Internal Soft-Start

D Minimal External Control Components

D 28-Pin SSOP Package

DESCRIPTION

The Si9136 is a current-mode PWM and PSM converter

controller, with two synchronous buck converters (3.3 V and

5 V) and a flyback (non-isolated buck-boost) converter (12 V).

Designed for portable devices, it offers a total five power

outputs (three tightly regulated dc/dc converter outputs, a

precision 3.3-V reference and a 5-V LDO output). It requires

minimum external components and is capable of achieving

conversion efficiencies approaching 95%.

The Si9136 is available in a 28-pin SSOP package and

specified to operate over the extended commercial (0

_C to

90

_C) temperature range.

FUNCTIONAL BLOCK DIAGRAM

5-V

Linear

Regulator

3.3-V

Voltage

Reference

3.3-V

SMPS

5-V

SMPS

12-V SMPS

Power-Up Control

+3.3 V

(5.0 V)

Control

Inputs

(+3.3 V)

+5 V

+12 V