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  Taiwan Semiconductor (TSMC) Electronic Components Datasheet  

TS3404 Datasheet

PWM Buck Controller

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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
Pin Descriptions
— PWM buck control circuit
Name
— Operating voltage can be up to 27V
Output
— Under voltage lock out (UVLO) protection
Vcc
— Soft start (SS) circuit
DataSheet4UC.ocmomp.
— Short circuit Protection (SCP)
FB
— Variable oscillator frequency 300KHz (max)
SCP
— 1.25V voltage reference Output
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
Amplifier Input Voltage
Collector Output Voltage
Source Current
Sink Current
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature 1.6mm(1/16”) from case for 10Sec.
DataSheet4U.com
VCC
VI
VO
ISOURCE
ISINK
TJ
TSTG
TLEAD
28
20
Vcc~1.0V
200
200
-20 ~ +150
-65 ~ +150
260
V
V
V
mA
mA
oC
oC
oC
TS3404
DataSheet4 U .com
1-5 2003/12 rev. A
DataShee


  Taiwan Semiconductor (TSMC) Electronic Components Datasheet  

TS3404 Datasheet

PWM Buck Controller

No Preview Available !

www.DataSheet4U.com
Recommended Operating Conditions
Parameter
Symbol.
Min.
Max.
Supply voltage
Amplifier input voltage
Collector output voltage
Current into feedback terminal
Feedback resistor
Timing capacitor
Oscillator frequency
VCC
VI
VO
IFB
RF
CT
FOSC
3.6
1.05
100
100
10
27
1.45
Vcc~1.5
45
6800
300
Electrical Characteristics
(VCC =6V, f = 200KHz, Ta =25 oC; unless otherwise specified.)
Parameter
Symbol
Test Conditions
Min Typ
Reference
Comp. Connect to FB
Output voltage change with
temperature
VREF
Ta= -20 oC ~ 25 oC
Ta= 25 oC ~ 85 oC
1.225
1.25
- 0.1
- 0.2
et4U.com
Under voltage lock out (UVLO)
Upper threshold Voltage
Lower threshold voltage
Hysteresis
Short circuit protection (SCP)
Input threshold voltage
Standby voltage
Latched input voltage
Input (source) current
Comparator threshold voltage
Oscillator (OSC)
Frequency
Standard deviation of frequency
Frequency change with voltage
Error Amplifier
Input offset voltage
Input offset current
Input bias current
Common mode input voltage
range
Open loop voltage amplification
Unity gain bandwidth
Common mode reject ratio
Max. output voltage
Min. output voltage
Output (sink) current (Comp)
Output (source) current (Comp)
DataSheet4U.com
VUT
VLWT
VHT
IO(REF) = 0.1mA, Ta= 25 oC
DataSheet4U.com
ViT
VSTB
VLT
ISCP
VCT
Ta= 25 oC
No pull up
No pull up
VI = 0.7V, Ta= 25 oC
FOSC
FOSC
CT = 270pF
CT = 270pF
VCC = 3.6V ~ 20V
VIO
IIO
IIB
VCM
AV
GBW
CMRR
VOH
VOL
IOI
IOO
VO (FB)= 1.25V
VCC = 3.6V ~ 20V
RF = 200k
VID = - 0.1V, VO = 1.25V
2.9
2.4
0.5
0.60 0.67
100 130
50
- 10 - 15
1.5
200
10
1
1.05
70
60
VREF~0.1
160
80
1.5
80
0.5 1.6
- 45 - 70
Unit
V
V
V
uA
K
pF
KHz
Max Unit
1.275
1
1
V
%
V
0.75 V
160 mV
100 mV
- 20 uA
V
KHz
%
±6
± 100
500
1.45
1
mV
nA
nA
V
dB
MHz
dB
V
V
mA
uA
TS3404
DataSheet4 U .com
2-5 2003/12 rev. A
DataShee


Part Number TS3404
Description PWM Buck Controller
Maker Taiwan Semiconductor Company
PDF Download

TS3404 Datasheet PDF






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