AP1503 Datasheet, PDF (1/5 Pages) Anachip Corp – 300Khz, 2.5A PWM Buck DC/DC Converter

300Khz, 2.5A PWM Buck DC/DC Converter
AP1503
„ Features
- Output voltage: 3.3V
- 300KHz +15% fixed switching frequency
- Voltage mode non-synchronous PWM control
- Thermal-shutdown and current-limit protection
- ON/OFF shutdown control input
- Operating voltage can be up to 22V
- Output load current: 2.5A
- SOP-7L packages
- Low power standby mode
- Built-in switching transistor on chip
„ Applications
- Simple High-efficiency step-down regulator
- On-card switching regulators
- Positive to negative converter
- DSL Modems
- Portable Computers
- Regulated Wall Adapters
- Distributed Power
„ Pin Assignment
SOP7 with Heat Sink
VIN
1
VB
2
SD
3
FB
4
7
VO
6
GND
5
COMP
„ General Description
The AP1503 series are monolithic ICs designed for
step-down DC/DC converters, and own the ability
of driving a 2.5A load without additional transistor
components. Due to reducing the number of
external component, the board space can be saved
easily. The external shutdown function can be
controlled by logic level and then come into standby
mode. The external compensation makes feedback
control have good line and load regulation.
Regarding protected function, thermal shutdown is
to prevent over temperature operating from damage,
and current limit is against over current operating of
the output switch. The AP1503 series operates at a
switching frequency of 300KHz thus allowing
smaller sized filter components than what would be
needed with lower frequency switching regulators.
Other features include a guaranteed +2% tolerance
on output voltage under specified input voltage and
output load conditions, and +15% on the oscillator
frequency. The output version included fixed 3.3V,
5V. The packages are available in a standard
SOP-7 lead package.
„ Pin Descriptions
Name
V_IN
VB
SD
FB
COMP
GND
VO
Description
Operating voltage input
Boost pin
ON/OFF Shutdown
Output voltage feedback control
Compensation pin
Ground
Switching output
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 1.0 Sep. 29, 2004
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