AP1635

PWM/PFM DUAL MODE STEP-DOWN DC/DC

CONVERTER

AP1635 Rev. 4

1 of 8

FEBRUARY 2009

www.diodes.com

Lead-free

•

•

Oscillator frequency: 700KHz (Typ.)

•

Internal reference: 1.0V (Typ.)

•

High efficiency: 93% (Typ.)

•

Current limit and thermal shutdown protection

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Lead Free Package: SOP-8L

•

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

(No Br, Sb)

•

Lead Free Finish/ RoHS Compliant (Note 1)

The AP1635 series are multi-functional step-down DC/DC

converters with built-in speed, low ON resistance drivers. It is

capable to deliver more than 1.2A output current with external

coil, diode and capacitor.

Output voltage is set-up by the external resistors. (±2.5%

accuracy). The 700KHz AP1635 that can work out with small

value external components comes out more compact board.

The device switches to and works under PFM mode with light

loads. It keeps at high efficiency for both light loads and large

output current.

AP1635 can be soft-start with a proper capacitor connected

between CE/SS pin and ground. The stand-by current is less

than 6uA when CE/SS pin is at “LOW” status. The device is

forced to switch off as the voltage at that pin is lower than the

stipulated voltage.

Applications

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Electronic Information Organizers

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Palmtops

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Cellular and portable phones

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Portable Audio Systems

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Various Multi-function Power Supplies

Ordering Information

AP 1635 S X - 13

Package

Packing

Lead Free

13 : Tape & Reel

G : Green

S : SOP-8L

L : Lead Free

Device

Package

Code

Packaging

(Note 2)

13” Tape and Reel

Quantity

Part Number Suffix

AP1635SL-13

S

SOP-8L

2500/Tape & Reel

-13

AP1635SG-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.

Features

General Description