AP1605 ANACHIP [Anachip Corp], AP1605 Datasheet

AP1605

Manufacturer Part Number

AP1605

Description

PWM/PFM Dual-mode Step-Down Switching Regulator

Manufacturer

ANACHIP [Anachip Corp]

Datasheet

1.AP1605.pdf (6 pages)

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PWM/PFM Dual-mode Step-Down Switching Regulator

- Low current consumption:

- Input voltage: 2.5V to 7V.

- 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.

- On-board power supplies of battery devices for

- Power supplies for audio equipment, including

- Fixed voltage power supply for cameras, video

- Power supplies for microcomputers.

- Conversion from four Ni-H or Ni-Cd cells or two

- Conversion of AC adapter input to 5V/3V.

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.

Adjustable version (+2.5%)

In operation: 100µA max.

Power off: 2µA max.

portable telephones, electronic notebooks, PDA,

and other hand-held sets.

portable CD players and headphone stereo

equipment.

equipment and communications equipment.

lithium-ion cells to 3.3V/3V.

Features

Applications

Pin Assignments

PVcc

Vss

Vcc

TSSOP-8L

SOP-8L

AP1605

Vss

PVcc

Vcc

1/6

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

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.

Name SOP TSSOP

PVcc

Vcc

Vss

General Description

Pin Descriptions

excellent

5、6

7、8

Pin No.

2、3

6、7

transient

Chip Enable:

Feedback pin

IC signal power supply pin,

add a 10Ω resistor to PVcc

and a 0.1µF capacitor to

GND.

IC power supply pin

Switch Pin. Connect external

inductor/diode here.

Minimize trace area at this

pin to reduce EMI.

GND Pin

H: Enable

L: Disable

Description

characteristics.

Rev. 1.1 Jan 18, 2005

AP1605

The

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