AP1605 Datasheet, PDF (1/6 Pages) Anachip Corp – PWM/PFM Dual-mode Step-Down Switching Regulator

PWM/PFM Dual-mode Step-Down Switching Regulator
AP1605
„ Features
- Low current consumption:
In operation: 100µA max.
Power off: 2µA max.
- Input voltage: 2.5V to 7V.
Adjustable version (+2.5%)
- PWM/PFM dual Mode
- Oscillation frequency: 300KHz (Typ.)
- With a power-off function.
- Built-in internal SW P-channel MOS
- SOP-8L/TSSOP-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.
„ Pin Assignments
FB ¹
CE ²
Vcc ³
PVcc 4
AP1605
SOP-8L
8 Vss
7 Vss
6 SW
5 _SW
Vss 1
8 SW
CE ²
7 PVcc
AP1605
CE 3
6 PVcc
FB 4
5 Vcc
TSSOP-8L
„ General Description
AP1605 consists of CMOS step-down switching
regulator with PWM/PFM dual mode control. These
devices include a reference voltage source, oscillation
circuit, error amplifier, internal PMOS and etc.
AP1605 provides low-ripple power, high efficiency,
and excellent transient characteristics. The
PWM/PFM control circuit is able to very the duty ratio
linearly 0%~0.25% (PFM) and 25%~100% (PWM).
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 7V, it is also
ideal when operating via an AC adapter.
„ Pin Descriptions
Pin
Pin No.
Name SOP TSSOP
Description
FB 1
4 Feedback pin
Chip Enable:
CE 2 2、3 H: Enable
L: Disable
IC signal power supply pin,
Vcc 3
5
add a 10Ω resistor to PVcc
and a 0.1µF capacitor to
GND.
PVcc 4 6、7 IC power supply pin
Switch Pin. Connect external
SW 5、6
8
inductor/diode here.
Minimize trace area at this
pin to reduce EMI.
Vss 7、8 1 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. 1.1 Jan 18, 2005
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