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Taiwan Memory Technology
Taiwan Memory Technology

T6309B Datasheet Preview

T6309B Datasheet

Micropower Step-up DC/DC Converter

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T6309B pdf
tm TE
CH
T6309B
Micropower Step-up DC/DC Converter
FEATURES
• Matched LED Current with Overvoltage
www.DataSheet4UP.rcoomtection
• 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
Part no.
T6309B-AX
T6309B-BX
Feedback Referemce
Voltage
400mV
1.19V
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.
TM Technology Inc. reserves the right
P. 1
to change products or specifications without notice.
Publication Date: SEP. 2005
Revision: A



Taiwan Memory Technology
Taiwan Memory Technology

T6309B Datasheet Preview

T6309B Datasheet

Micropower Step-up DC/DC Converter

No Preview Available !

T6309B pdf
tm TE
CH
T6309B
PIN ARRANGEMENT
SOT23-6 (Top view)
SW
GND
FBwww.DataSheet4U.com
16
25
34
VIN
OVP
CE
PIN DESCRIPTION
SYMBOL
Pin No.
SW
GND
1
2
FB 3
CE
OVP
VIN
4
5
6
DESCRIPTION
Switch pin. Connect inductor/diode here. Minimize trace area at this
pin to reduce EMI.
Ground pin. Connect to local ground plane.
Feedback pin. Reference voltage is 400mV (T6309B-A). Optional
reference voltage is 1.19V (T6309B-B). Connect cathode of lowest
LED and current sense resistor here.
Chip enable pin. Tie CE pin to 1.5V or higher to enable device;
0.4V or less to shutdown the device. Do not float this pin.
Overvoltage protection. Connect this pin to the output capacitor of
the converter.
Power supply Input pin.
BLOCK DIAGRAM
V IN
FB
m in im u m
o ff-tim e
o n e-sh o t
e rro r
a m p lifie r
-
+
CE
v o lta g e
refe re n c e
under
v o lta g e
lo c k o u t
o v e rv o lta g e
p ro te c tio n
+
-
c o n tro l
lo g ic
1 .1 9 V
b u ffe r
d riv e r
c u rre n t
lim it
OVP
SW
GND
TM Technology Inc. reserves the right
P. 2
to change products or specifications without notice.
Publication Date: SEP. 2005
Revision: A


Part Number T6309B
Description Micropower Step-up DC/DC Converter
Maker Taiwan Memory Technology
Total Page 11 Pages
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Taiwan Memory Technology
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