Diodes AP1605 User Manual

AP1605

PWM/PFM DUAL-MODE STEP-DOWN SWITCHING

REGULATOR

Features

• Low current consum ption: In operation: 100µA max.

Power off: 2µA max.

• Input voltage: 2.5V to 7V Adjustable version (+

• PWM/PFM dual Mode

• Oscillation frequency: 300KHz (Typ.)

• With a power-off function.

• Built-in internal SW P-channel MOS

• Lead Free package: SOP-8L

• SOP-8L: Available in “Green” Molding Compound

(No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 1)

2.5%)

Applications

• On-board power supply 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 s upply 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

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 P M OS a nd etc.

AP1605 provides low-ripple power, high efficiency, and excellent transient characteristics. The PWM/PFM control circuit is able to vary 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 coupl ed 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.

Ordering Information

AP 1605 S X - 13

Package PackingLead Free

S : SOP-8L

L : Lead Free

G : Green

Device

AP1605SL-13 S SOP-8L 2500/Tape & Reel -13

Lead-free

Package

Code

Packaging

(Note 2)

AP1605SG-13 S SOP-8L 2500/Tape & Reel -13

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at http://www.diodes.com/products/lead_free.html

2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at

http://www.diodes.com/datasheets/ap02001.pdf

AP1605 Rev. 2 1 of 8 FEBRUARY 2009

www.diodes.com © Diodes Incorporated

13 : Tape & Reel

13” Tape and Reel

Quantity Part Number Suffix

Pin Assignments

( Top View )

AP1605

PWM/PFM DUAL-MODE STEP-DOWN SWITCHING

REGULATOR

Vcc

PVcc

SOP-8L

Vss

Pin Descriptions

Pin Name Pin No. Description

FB 1 Feedback pin

Chip Enable:

CE 2

Vcc 3

PVcc 4 IC power supply pin

SW 5, 6 Vss 7, 8 GND Pin

H: Enable

L: Disable IC signal power supply pin, add a 10Ω resistor to PVc c an d a 0. 1µF capacitor to GND.

Switch Pin. Connect external inductor/diode here. Minimize trace area at this pin to reduce EMI.

AP1605 Rev. 2 2 of 8 FEBRUARY 2009

Block Diagram

AP1605

PWM/PFM DUAL-MODE STEP-DOWN SWITCHING

REGULATOR

AP1605

PWM/PFM- Switched

Control Circuit

Oscillation Circuit

Reference Voltage Source

Absolute Maximum Ratings

Symbol Parameter Rating Unit

VCC VCC Pin Voltage VSS - 0.3 to VSS + 8 V

PVCC PVCC Pin Voltage VSS - 0.3 to VSS + 8 V

FB FB Pin Voltage VSS - 0.3 to VSS + 8 V VCE ON/OFF Pin Voltage VSS - 0.3 to VSS + 8 V VSW Switch Pin Voltage VSS - 0.3 to VIN + 0.3 V

PD Power Dissi pation 1200 mW

Operating Temperature Range -20 to +85

OPR

Storage Temperature Range -20 to +125

STG

Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be

AP1605 Rev. 2 3 of 8 FEBRUARY 2009

exceeded under any conditions.

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