T6313A datasheet(1/10 Pages) TMT

Part #	T6313A

Description	Low Noise, High Efficiency WhiteLED Charge Pump

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Manufacturer	TMT [Taiwan Memory Technology]

Direct Link	http://www.tmtech.com.tw

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TE

CH

tm

Preliminary T6313A

TM Technology Inc. reserves the right

P. 1

Publication Date: JAN. 2006

to change products or specifications without notice.

Revision: C

Low Noise, High Efficiency

WhiteLED Charge Pump

FEATURES

• 4 Current Source Outputs

• 20mA Full Scale Current for each LED

• Power efficency up to 93%

• 32 levels for brightness

• 2 wires interface

• Low Noise Constant Frequency Operation

• High Accuracy Brightness Matching

• White LED Backlighting

• 0.5% LED current matching

• Automatic Soft-Start

• No External Inductors, Schottky, or Zener

Diode and Resistor Required

• 500KHz Switching Frequency

(1MHz optional)

• 2.7V to 5.5V supply voltage

• Shutdown current is less 1uA

• Temperature Range -40 to 85°C

• 16-Pin QFN

Applications

• Cellular Phones

• Portable Communication Devices

• Handheld devices

• Digital Cameras

• PDAs

• LED/Display Back Light Driver

• LEDs for Camera Flash

PART NUMBER EXAMPLES

GRNERAL DESCRIPTION

The T6313A is a charge pump DC/DC

converter driving a constant current up to 20mA

for each LED of total four LEDs. It is a high

efficiency device that is up to 93%, and it would

be a suitable driving device for LED back light

application. The T6313A operates in a 1.5x

charge pump mode based on input voltage from

2.7v to 5.5v. Operation frequency is at fixed

high frequencies either 500KHz or 1MHz

typically. It can drive 4 white LEDs connected

in parallel and provides tightly matched

regulated current to achieve uniformity of

brightness in LCD backlighting applications.

The T6313A uses two input pins to enable,

disable, and set the LED drive current for one of

32 levels of brightness. Also has a built-in soft-

start circuitry to prevent excessive inrush

current during start-up. A very low shutdown

current feature and a low quiescent current will

consume very little power and allow the device

to operate in a very high efficiency. The

T6313A is available in 16-pin QFN packages.

PART NO.

PACKAGE

Marking

T6313A-AF QFN 4mm X 4mm

6313

T6313A-BF QFN 3mm X 3mm

6313

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