Diodes AP3156 Manuel d'utilisateur télécharger pdf

AP3156

HIGH EFFICIENCY 1X/1.5X/2X CHARGE PUMP

FOR WHITE LED APPLICATIONS

AP3156 Rev. 1 1 of 15 SEPTEMBER 2009

www.diodes.com © Diodes Incorporated

• V

Range: 2.7V to 5.5V

• Fully Programmable Current with Single Wire

• 32-Step Logarithmic Scale

• 20/25mA Max Current per Channel

• Four Low Current Settings Down to 50µA

• Low I

(50µA) for Low Current Mode

• Tri-Mode 1X, 1.5X, and 2X Charge Pump for Maximum

Efficiency and V

Coverage

• Drives up to Six Channels of LEDs

• Individual Main/Sub-Group Control

• No Inductors, Low Noise Operation

• 0.5/1/2MHz Constant Switching Frequency

• Small Application Circuit

• Built-In Thermal Protection

• Built-In Auto-Disable For Open Circuit

• Automatic Soft Start

• I

<1µA in Shutdown

• Thermally-Enhanced QFN4040-16 Package: Available

in “Green” Molding Compound (No Br, Sb)

• Lead Free Finish / RoHS Compliant (Note 1)

The AP3156 is a low noise, constant frequency charge pump

DC/DC converter that uses a tri-mode load switch (1X), fractional

(1.5X), and doubling (2X) conversion to maximize efficiency for

white LED applications. The AP3156 is capable of driving the

LED channels at 120mA maximum from a 2.7V to 5.5V input. The

current sinks may be operated individually or in parallel for driving

higher-current LEDs. A low external parts count (two 1µF flying

capacitors and two small 1µF capacitors at V

and V

OUT

) make

this part ideally suited for small, battery-powered applications.

AP3156 serial digital input is used to enable, disable and set

current for each LED with a 32-level logarithmic scale plus four

low-current settings down to 50µA for optimized efficiency, with a

low quiescent current of only 50µA.

Each output of the AP3156 is equipped with built-in protection for

OUT

short circuit and auto-disable for LED failure conditions.

Built-in soft-start circuitry prevents excessive inrush current

during start-up. A low-current shutdown feature disconnects the

load from V

and reduces quiescent current to less than 1µA.

The AP3156 is available in a lead-free, space-saving, thermally

enhanced 16-pin 4x4mm QFN package.

Applications

• Color (RGB) Lighting

• Programmable Current Sinks

• White LED Backlighting

• White Photo Flash for Digital Still Cameras

Typical Application Circuit

1uF

AP3156

OUT

GND

SDI

1uF

9,11

LED

1uF

OUT

LED

Features

General Description

1 2 3 4 5 6 ... 14 15

Résumé du contenu

Page 1 - General Description

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Page 2 - PackingLead Free

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Page 3 - Description

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Page 4

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Page 5 - Electrical Characteristics

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Page 6

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Page 7

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Page 8

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Page 9 - Functional Description

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Page 10 - FOR WHITE LED APPLICATIONS

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Page 11 - Serial Digital Interface

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Page 12

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Page 13 - Marking Information

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Page 15

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Diodes AP3156 Manuel d'utilisateur

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