AP2004
PWM Buck Controller
Features
- PWM Buck Control Circuitry
- Operating voltage can be up to 27V
- Under voltage Lockout (UVLO) Protection
- Short Circuit Protection (SCP)
- Soft-start circuit
- Variable Oscillator Frequency -- 300Khz Max
- 1.25V voltage reference Output
- 8-pin PDIP and SOP packages
General Description
The AP2004 integrates Pulse-Width-Modulation
(PWM) control circuit into a single chip, mainly
designs for power-supply regulator. All the functions
include an on-chip 1.25V reference output, an error
amplifier, an adjustable oscillator, a soft-start,
UVLO, SCP circuitry, and a push-pull output circuit.
Switching frequency is adjustable by trimming CT.
During low VCC situation, the UVLO makes sure
that the outputs are off until the internal circuit
operates normally.
Applications
- Backlight inverter
- LCD Monitor
- XDROM, XDSL Product
- DC/DC converters in computers, etc.
Pin Assignment
( Top View )
OUT
VCC
COMP
FB
1
2
3
4
8
7
6
5
Pin Descriptions
Name
GND
CT
SS
SCP
Description
Timing Capacitor
Voltage Feedback
Soft-Start.
Feedback Loop Compensation
PWM Output
Ground
Supply Voltage
Short Circuit Protection
CT
FB
SS
COMP
OUT
GND
VCC
SCP
PDIP/SOP
Ordering Information
AP2004 X
Package
N: PDIP-8L
S: SOP-8L
X
X
Lead Free
Packing
Blank : Tube
Blank : Normal
L : Lead Free Package A : Taping
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev. 0.4 Arpr 6, 2004
1/8
ANACHIP [ ANACHIP CORP ]
