FEATURES

CCITT Compatible

Current-Mode Control

Low Power Consumption

(less than 5 mW)

10- to 120-V Input Range

200-V, 250-mA MOSFET

Internal Start-Up Circuit

Current-Mode Control

SHUTDOWN and RESET

DESCRIPTION

The Si9105 high-voltage switchmode regulator is a monolithic

BiC/DMOS integrated circuit which contains most of the

components necessary to implement a high-efficiency dc/dc

converter in ISDN terminals up to 3 watts. A 0.5-mA max

supply current makes possible the design of a dc/dc converter

with 60 efficiency at 25 mW, therefore meeting the

recommended performance under the CCITT

I.430 specifications.

This device may be used with an appropriate transformer to

implement isolated flyback power converter topologies to

provide single or multiple regulated dc outputs (i.e., 5 V).

The Si9105 is available in both standard and lead (Pb)-free

16-pin wide-body SOIC, 14-pin plastic DIP and 20-pin PLCC

packages which are specified to operate over the industrial

temperature range of −40 C to 85 C.