TS3404 Datasheet, PDF (1/5 Pages) Taiwan Semiconductor Company, Ltd – PWM Buck Controller

TS3404
PWM Buck Controller
Pin assignment:
1. Out
2. Vcc
3. Comp.
4. FB
5. SCP
6. SS
7. CT
8. Gnd
Supply Voltage Range 3.6V to 27V
Output Driving Current 200mA
Oscillator Frequency up to 300KHz
General Description
The TS3404 integrates Pulse Width Modulation (PWM) control circuit into a single chip, and makes simple work out of
implementing a complete control and protection scheme for a DC-DC step-down converter. The TS3404 provides simple
feedback loop compensation, 1.25V reference output, error amplifier, adjustable oscillator, soft start, under voltage lock
out (UVLO), short circuit protection(SCP) circuitry, and push pull output circuit.
The TS3404 is design for adjustable switching frequency by trimming time capacitor (CT), during low supply voltage
situation, the under voltage lock out (UVLO) makes sure that the output are off until the internal circuit operates normally.
The TS3404 is offered in DIP-8 and SOP-8 package.
Features
— PWM buck control circuit
— Operating voltage can be up to 27V
— Under voltage lock out (UVLO) protection
— Soft start (SS) circuit
— Short circuit Protection (SCP)
— Variable oscillator frequency 300KHz (max)
— 1.25V voltage reference Output
Pin Descriptions
Name
Output
Vcc
Comp.
FB
SCP
SS
CT
Gnd
Description
PWM Output
Supply Voltage
Feedback Loop Compensation
Voltage Feedback
Short Circuit Protection
Soft Start
Timing Capacitor
Ground
Applications
— LCD Monitor
— xD-ROM, xDSL product
— DC to DC converters in computers
— Backlight inverter
Ordering Information
Part No.
TS3404CS
TS3404CD
Operating Temp.
(Ambient)
-20 ~ +85 ^oC
Package
SOP-8
DIP-8
Absolute Maximum Rating
Supply Voltage
V_CC
28
V
Amplifier Input Voltage
V_I
20
V
Collector Output Voltage
V_O
Vcc~1.0V
V
Source Current
I_SOURCE
200
mA
Sink Current
I_SINK
200
mA
Operating Junction Temperature Range
T_J
-20 ~ +150
o_C
Storage Temperature Range
T_STG
-65 ~ +150
o_C
Lead Temperature 1.6mm(1/16”) from case for 10Sec.
T_LEAD
260
o_C
TS3404
1-5
2003/12 rev. A