TSM108_06 Datasheet, PDF (1/13 Pages) STMicroelectronics – VOLTAGE AND CURRENT STEPDOWN PWM CONTROLLER

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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