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AP5725

WHITE LED STEP-UP CONVERTER

AP5725

Document number: DS31844 Rev. 3 - 2

1 of 17

www.diodes.com

July 2010

Description

The AP5725 is a step-up DC/DC converter specifically

designed to drive white LEDs with a constant current. The

device can drive 2 ~ 6 LEDs in series from a Li-Ion cell.

Series connection of the LEDs provides identical LED

currents resulting in uniform brightness and eliminates the

need for ballast resistors. For driving higher number of LEDs,

AP5725 also supports a single feedback of parallel

connected multiple strings of equal number of LEDs.

The AP5725 switches at 1.2MHz that allows the use of tiny

external components. A low 0.25V feedback voltage

minimizes power loss in the current setting resistor for better

efficiency.

Pin Assignments

OVP

(Top View)

VIN

GND

SOT26 / TSOT23-6

OVP

GND

(Top View)

DFN2020C-6

Features

• High efficiency: 84% typical

• Fast 1.2MHz switching frequency

• Current limit and UVLO protections

• Internal thermal shutdown

• Internal Over Voltage Protection

• Integrated soft-start function

• SOT26, TSOT23-6 and DFN2020C-6: Available in

“Green” Molding Compound (No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 1)

Applications

• Cellular Phones

• PDAs, Hand held Computers

• Digital Cameras

• MP3 Players

• GPS Receivers

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.

Typical Application Circuit

GND

AP5725

OUT

1uF

SET

22uH

1uF

OVP

2~6 LEDs

PWM Dimming

OFFON

Figure 1. Typical Application Circuit

1 2 3 4 5 6 ... 16 17

Resumo do Conteúdo

Página 1 - 2~6 LEDs

AP5725WHITE LED STEP-UP CONVERTER AP5725 Document number: DS31844 Rev. 3 - 2 1 of 17 www.diodes.com July 2010 © Diodes Incorporated Description

Página 2 - Pin Descriptions

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Página 4 - Electrical Characteristics (V

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Página 5 - Feedback Voltage(V)

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Página 6 - Temperature(

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Página 7 - 4 LEDs ; L = 22uH

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Página 8

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Página 10 - July 2010

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Página 11 - WHITE LED STEP-UP CONVERTER

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Página 12

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Página 13 - ( Top View )

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Página 14

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Página 15 - (Continued)

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Página 17

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