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參數資料
| 型號： | T6309B-BX |
| 廠商： | TM Technology, Inc. |
| 英文描述： | Micropower Step-up DC/DC Converter |
| 中文描述： | 微功耗升壓型DC / DC轉換器 |
| 文件頁數： | 1/11頁 |
| 文件大小： | 131K |
| 代理商： | T6309B-BX |
TE
CH
tm
T6309B
TM Technology Inc. reserves the right
P. 1
Publication Date: SEP. 2005
to change products or specifications without notice.
Revision: A
Micropower Step-up DC/DC Converter
FEATURES
Matched LED Current with Overvoltage
Protection
Drives LEDs in series
Up to 85% Efficiency
Low 400mV Feedback Reference,
Optional 1.19V Feedback Reference
Internal Current Limit 250mA
Under Voltage Lock Out Circuits
0.1uA Low Shutdown Supply Current
6-pin SOT-23 Package
ESD Human Body Mode Over 5KV
APPLICATIONS
Cellular Phones
Portable Communication Devices
Handheld Electronics
PDAs
LED/Display Back Light Driver
PART NUMBER EXAMPLES
condition. The T6309B is available in SOT-
23-6 packages.
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
Part no.
Feedback Referemce
Voltage
400mV
T6309B-AX
T6309B-BX
1.19V
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