Copyright

© ANPEC Electronics Corp.

Rev. A.4 - Jun., 2009

APW7008

www.anpec.com.tw

1

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and

advise customers to obtain the latest version of relevant information to verify before placing orders.

1X/1.5X/2x Charge Pump White LED Driver

Features

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±1.5% LED Current Matching

•

High Efficiency Up to 90% Over Li-ion Battery

Discharge

•

Output Current Up to 30mA per LED

•

2.7V to 5.5V Operating Voltage

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Allow to Turn On or Off a Combination of LEDs

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1x/1.5x/2x Charge Pump Modes

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Low Shutdown Current: 2

µA Maximum

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Low Input Ripple and EMI

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Internal Soft-Start Limits Inrush Current

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Short Circuit Current-Limit

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Thermal Shutdown Protection

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Output Over-Voltage Protection

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3mmx3mm 16-Pin QFN (QFN3X3-16) Package

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Lead Free and Green Devices Available

(RoHS Compliant)

Applications

General Description

The APW7008 is a high efficiency charge pump white

LED driver; the device drives up four white LEDs with

regulated constant current for uniform intensity. The sup-

ply voltage ranges from 2.7V to 5.5V and it is optimized for

a Li-ion battery application. The APW7008 operates in 1x,

1.5x, and 2x charge pump modes and automatically

switches the charge pump modes depend on the input

voltage to maintain the required power for high power

efficiency. The APW7008 provides up to 30mA per LED

for a total of 120mA and allows several methods, such as

a PWM signal on the CTRL0 pin for LED dimming. Three

control logic pins allow to disable or enable a combina-

tion of LEDs. The supply current is only 2mA in 2x mode,

and the EN pin allows the device to enter shutdown mode

with 2

µA quiescent current. The APW7008 switches at

1MHz frequency and only requires four 1

µF ceramic ca-

pacitors and one resistor, and ensures low input current

ripple and EMI.

The APW7008 is available in a 16-pin QFN package.

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Cellular Phone White LED Back Light

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Portable Device

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PDA and Handheld Computer

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DSC

Pin Configuration

APW7008

QFN3x3-16 Top View

1

3

2

4

6

5

7

8

CTRL1

CTRL0

EN

CTRL2

C1+

C1-

GND

C2-

12

10

11

9

15

16

14

13

Metal

GND Pad

(Bottom)