TSM108 データシートの表示（PDF） - STMicroelectronics

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TSM108

VOLTAGE AND CURRENT STEPDOWN PWM CONTROLLER

STMicroelectronics 

TSM108

VOLTAGE AND CURRENT STEPDOWN PWM CONTROLLER

■ OUTPUT HIGH SIDE CURRENT SENSING

■ PRECISE CC/CV REGULATION

■ ADJUSTABLE SWITCHING FREQUENCY

■ ADJUSTABLE OVP/UVP UVLO

THRESHOLDS

■ STANDBY MODE FEATURE

■ SUSTAINS 60V

■ MINIMAL EXTERNAL COMPONENTS

COUNT

■ DRIVES EXTERNAL P-CHANNEL MOSFET

OR PNP BIPOLAR TRANSISTORS

DESCRIPTION

TSM108 is a step-down PWM controller designed

to drive an external P-channel MOSFET, provid-

ing constant voltage and constant current regula-

tions in battery charger applications.

TSM108 can easily be configured for very wide

voltage and current needs.

It has been realized in rugged BCD technology

and includes a PWM generator, Voltage and Cur-

rent control loops, a precise Voltage Reference,

and a Gate Driver. The device can sustain 60V on

Vcc, and therefore meet the standard Load Dump

requirements of the 12V cars battery.

On boards there are other security functions which

lock the external power in OFF state: OVLO (Over

Voltage Lockout) and UVLO (Under Voltage Lock-

out). The mosfet gate is also protected from over

voltage drive thanks to a 12V clamping protection

circuit.

Moreover, a standby feature allows very low qui-

escent current when activated, but keeping safe

the external power element when Off.

The IC is suitable for 12V car accessories, as well

as other DC/DC step down converters.

APPLICATION DIAGRAM

D

SO14

(Plastic Micropackage)

ORDER CODE

Part Number Temperature Range

TSM108I

-40°, +125°C

Package

D

•

D = Small Outline Package (SO) - also available in Tape & Reel (DT)

PIN CONNECTIONS (top view)

VCC 1

!STBY 2

GND 3

UV 4

OV 5

G6

OSC 7

14 GD

13 VS

12 ICTRL

11 VCTRL

10 VREF

9 ICOMP

8 VCOMP

March 2006

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