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T6311A 반도체 회로 부품 판매점

Constant-Current White LED Bias Supply



Taiwan Memory Technology 로고
Taiwan Memory Technology
T6311A 데이터시트, 핀배열, 회로
tm TE
CH
FEATURES
• Low 200mV Dropout at 9mA
• Up to 150mA LED Bias Current
• 0.3% LED Current Matching
www.DataSheet4US.cimomple LED Brightness Control
• Low 40uA Supply Current
• Low 0.05uA Shutdown Current
• 2.5V to 5.5V Supply Voltage Range
• SOP-8 and SOT23-6 Package
• Output channel :
SOP-8 package for four channel
SOT23-6 package for three channel
Applications
• Cellular Phones
• Portable Communication Devices
• Handheld Electronics
• Digital Cameras
• PDAs
• LED/Display Back Light Driver
• LEDs for Camera Flash
PART NUMBER EXAMPLES
PART NO.
T6311A-D
T6311A-X
PACKAGE
SOP-8
SOT23-6
Preliminary Product spec. T6311A
Low-Dropout, Constant-Current
White LED Bias Supply
GRNERAL DESCRIPTION
The T6311A low-dropout bias supply for
white LEDs is a high-performance alternative
to the simple ballast resistors used in
conventional white LED designs. The T6311A
uses a single resistor to set the bias current for
four LEDs, which are matched to 0.3%. The
T6311A consumes only 40uA of supply
current when enabled and 0.05uA when
disabled. The T6311A advantages over ballast
resistors include significantly better LED to
LED bias matching, much lower bias variation
with supply voltage variation, significantly
lower dropout voltage, and in some
applications, significantly improved efficiency.
The T6311A requires a 200mV dropout at a
9mA load on each output to match the LED
brightness. The T6311A is available in SOP-8
and SOT23-6 package.
TM Technology Inc. reserves the right
P. 1
to change products or specifications without notice.
Publication Date: JUN. 2005
Revision: C


T6311A 데이터시트, 핀배열, 회로
tm TE
CH
Preliminary Product spec. T6311A
PIN ARRANGEMENT(Top view)
SOT23-6
SOP-8
EN
GND
www.DataSheet4U.com
SET
16
25
34
LED1
LED2
LED3
LED1
LED2
LED3
LED4
18
27
36
45
EN
GND
SET
NC
PIN DESCRIPTION
SYMBO
L
EN
GND
SET
NC
LED4
LED3
LED2
LED1
Pin no.
SOP-8 SOT23-6
81
72
63
5-
4-
34
25
16
DESCRIPTION
Enable Input/Power Input. Drive high (> 2.5V) to enable; drive low (< 2.2V) to
disable. When disabled, SET, LED1, LED2, LED3 and LED4 are high impedance.
When enabled, EN is the power input for the T6311A.
Ground
Bias Current Set Input. The current flowing into SET sets the bias current into each
LED by ILED_= 240 x ISET. VSET is internally biased to 1.2V. SET is high
impedance when EN is low.
No connection.
LED 4 Cathode Connection. Current flowing into LED4 is 240 times the current
flowing into SET. LED4 is high impedance when EN is low.
LED 3 Cathode Connection. Current flowing into LED3 is 240 times the current
flowing into SET. LED3 is high impedance when EN is low.
LED 2 Cathode Connection. Current flowing into LED2 is 240 times the current
flowing into SET. LED2 is high impedance when EN is low.
LED 1 Cathode Connection. Current flowing into LED1 is 240 times the current
flowing into SET. LED1 is high impedance when EN is low.
TM Technology Inc. reserves the right
P.2
to change products or specifications without notice.
Publication Date: JUN. 2005
Revision: C




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T6311A led

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Constant-Current White LED Bias Supply - Taiwan Memory Technology