Diodes AP3605 Manuel d'utilisateur télécharger pdf

Jan. 2013 Rev. 1. 8 BCD Semiconductor Manufacturing Limited

4-Channel Charge Pump LED Driver with Current Balancing and Wide Range PWM Dimming AP3605

Data Sheet

General Description

The AP3605 is a step-up DC/DC converter based on

1.5x charge pump current source, it is specially

designed for LED supplies in backlight display.

The AP3605 can provide constant current up to 20mA

for each LED, which is programmed by an external

resistor, so it has a total capability to provide 80mA for

4 LEDs. The chip has a good performance of LED

current matching and allows PWM brightness dim-

ming control. Additionally, high switching frequency

up to 1MHz enables the use of two small external

flying capacitors. Internal soft-start circuitry prevents

excessive inrush current during start-up.

The AP3605 supply voltage range is from 2.7V to

5.5V, ideally suited for applications powered by the Li-

ion battery.

The AP3605 is available in a 3mmx3mm QFN-3x3-16

tiny package. Its operating temperature range is -40

to 85

Features

· Regulated Output Current with ±3% Matching

· Regulated ±10% Output Current Source

· Drive up to 4 LEDs at 20mA Each

· Wide Operating Voltage Range: 2.7V to 5.5V

· High Efficiency up to 93%

· High Operating Frequency: 1MHz

· Built-in Soft-Start to Limit the Inrush Current

· LED Brightness Control through PWM and Ana-

log Signal

· PWM Dimming Frequency up to 50kHz

· Built-in Standby Mode to Get PWM Dimming

Duty Cycle Control Linearity

· Built-in OTSD (Over Temperature Shutdown)

Function to Protect the Device from Burn Out

Applications

· Mobile Phone

· MP3, MP4

· White LED Backlight in Mobile Phone, PDA

Figure 1. Package Type of AP3605

QFN-3x3-16

1 2 3 4 5 6 ... 12 13

Résumé du contenu

Page 1 - Applications

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Page 2 - Pin Configuration

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Page 3 - Functional Block Diagram

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Page 4

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Page 5 - Electrical Characteristics

IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the

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Page 10 - Typical Application

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Page 12 - Unit: mm(inch)

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