AP1623 Datasheet, PDF (1/6 Pages) Anachip Corp – PWM Control Step-Down Switching Regulator-Converter

PWM Control Step-Down Switching Regulator-Converter
AP1623
„ Features
- Low current consumption:
In operation: 60µA max.
Power off: 0.5µA max.
- Input voltage: 2.5V to 16V.
- Output voltage: 1.8V & Adjustable to 6V.
- Duty ratio: 0% to 100% PWM control
- Oscillation frequency: 180KHz typ.
- Soft-start function: 8ms typ.
- With a power-off function.
- Built-in internal SW P-channel MOS
- SOP-8L Package.
„ Applications
- On-board power supplies of battery devices for
portable telephones, electronic notebooks, PDA,
and other hand-held sets.
- Power supplies for audio equipment, including
portable CD players and headphone stereo
equipment.
- Fixed voltage power supply for cameras, video
equipment and communications equipment.
- Power supplies for microcomputers.
- Conversion from four Ni-H or Ni-Cd cells or two
lithium-ion cells to 3.3V/3V.
- Conversion of AC adapter input to 5V/3V.
„ General Description
AP1623 consists of CMOS step-down switching
regulator-controllers with PWM control. These devices
include a reference voltage source, oscillation circuit,
error amplifier, internal PMOS and etc.
AP1623 provides low-ripple power, high efficiency,
and excellent transient characteristics. The PWM
control circuit is able to very the duty ratio linearly
from 0 up to 100. This converter also contains an
error amplifier circuit as well as a soft-start circuit that
prevent s overshoot at startup.
With the addition of an internal P-channel Power MOS,
a coil, capacitors, and a diode connected externally,
these ICs can function as step-down switching
regulators. They serve as ideal power supply units for
portable devices when coupled with the SOP–8L
mini-package, providing such outstanding features as
low current consumption. Since this converter can
accommodate an input voltage of up to 16V, it is also
ideal when operating via an AC adapter.
„ Pin Assignments
VOUT 1
ON/OFF 2
VCC ³
PVCC 4
AP1623
8 ^Vss
7 Vss
6 SW
5 _SW
„ Pin Descriptions
Name Pin
Description
VOUT
ON/OFF
1 Output voltage monitoring pin
Power-off pin
H: Normal operation
2
(Step-down operation)
L: Step-down operation
stopped
(All circuits deactivated)
VCC
3 IC signal power supply pin
PVCC
SW
VSS
4 IC power supply pin
Switch Pin. Connect external
5、6
inductor/diode here. Minimize
trace area at this pin to reduce
EMI.
7、8 GND Pin
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. 0.1 Feb 10, 2004
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