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tm

TE

CH

T6309B

Micropower Step-up DC/DC Converter

FEATURES

鈥?Matched LED Current with Overvoltage

Protection

鈥?Drives LEDs in series

鈥?Up to 85% Efficiency

鈥?Low 400mV Feedback Reference,

Optional 1.19V Feedback Reference

鈥?Internal Current Limit 250mA

鈥?Under Voltage Lock Out Circuits

鈥?0.1uA Low Shutdown Supply Current

鈥?6-pin SOT-23 Package

鈥?ESD Human Body Mode Over 5KV

GRNERAL DESCRIPTION

The T6309B is a step-up DC/DC converter

that drives LED with a constant current. The

device can driver up to 3 series LEDs from a

single-cell Li-Ion battery. Series connection of

the LEDs provides constant LED current that

results in uniform brightness.

The T6309B features a minimum off-time

current-limited PFM control scheme. The

LED current is set with an external sense

resistor (Rs) and is regulated by the feedback

pin (FB) that regulates the voltage across the

sense resistor to 400mV (typ). The low

400mV feedback reference voltage reduces

power loss and improves efficiency for LED

driver applications. Optional 1.19V feedback

reference is available for normal output

voltage applications like LCD bias. Output

overvoltage protection (OVP) is integrated to

prevent damage in case of output open circuit

condition (e.g. faulty LED). The OVP pin can

monitor the output voltage and turn off the

converter in the event of overvoltage

condition. The T6309B is available in SOT-

23-6 packages.

APPLICATIONS

鈥?Cellular Phones

鈥?Portable Communication Devices

鈥?Handheld Electronics

鈥?PDAs

鈥?LED/Display Back Light Driver

PART NUMBER EXAMPLES

Part no.

T6309B-AX

T6309B-BX

Feedback Referemce

Voltage

400mV

1.19V

TM Technology Inc. reserves the right

to change products or specifications without notice.

P. 1

Publication Date: SEP. 2005

Revision: A

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