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Taiwan Memory Technology |
tm TE
CH
FEATURES
• Up to 400mA LED Bias Current
• 3% LED Current Matching
• Simple LED Brightness Control
www.DataSheet•4UL.coowm 0.05uA Shutdown Current
• 2.7V to 5V Supply Voltage Range
• SOP-8 Package and Lead-free
• VSET Resistor Option :
T6316A : External Resistor
T6316B : 20, 85, 100, 125, 150, 175, 200,
250, 300 and 350mA Output
Current Option by Internal
Resistor
• Build in Thermat Protect 160 °C
Preliminary T6316A/B
Low-Dropout, Constant-Current
White LED Bias Supply
GENERAL DESCRIPTION
The T6316A/B low-dropout bias supply for
white LEDs is a high-performance alternative
to the simple ballast resistors used in
conventional white LED designs. The T6316A
uses a single resistor to set the bias current for
four LEDs, which are matched to 3%. The
T6316B build in internal resistor to set the bias
current for four LED. The T6316A/B
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 T6316A/B is
available in SOP-8 package and lead-free.
Applications
• Portable Communication Devices
• Handheld Electronics
• LED/Display Back Light Driver
• Lightings
PART NUMBER EXAMPLES
PART NO.
T6316A-D
T6316A-DG
T6316B-20D
T6316B-20DG
T6316B-75D
T6316B-75DG
Output
PACKAGE Current
SOP-8
-
SOP-8
lead-free
-
SOP-8 20mA
SOP-8
lead-free
20mA
SOP-8 75mA
SOP-8
lead-free
75mA
Vset
resistor
External
External
Internal
Internal
Internal
Internal
T6316B-350D SOP-8 350mA Internal
T6316B-350DG
SOP-8
lead-free
350mA
Internal
TM Technology Inc. reserves the right
P. 1
to change products or specifications without notice.
Publication Date: JUN. 2006
Revision: B
tm TE
CH
PIN ARRANGEMENT(Top view)
Preliminary T6316A/B
LE D 1
LE D 2
LE D 3
LE D 4
www.DataSheet4U.com
18
27
36
45
SOP-8
T6316A-D
V SET
EN
VDD
V SS
LE D 1
LE D 2
LE D 3
LE D 4
18
27
36
45
EN
VDD
V SS
V SS
SOP-8
T6316B-D
PIN DESCRIPTION
SYMBOL
LED1
LED2
LED3
LED4
VSS
VDD
EN
VSET
T6316A
1
2
3
4
5
6
7
8
T6316B
1
2
3
4
5,6
7
8
-
DESCRIPTION
LED 1 Cathode Connection. Current flowing into LED1 is 270/250 times the current
flowing into SET. LED1 is high impedance when EN is low.
LED 2 Cathode Connection. Current flowing into LED1 is 270/250 times the current
flowing into SET. LED2 is high impedance when EN is low.
LED 3 Cathode Connection. Current flowing into LED1 is 270/250 times the current
flowing into SET. LED3 is high impedance when EN is low.
LED 4 Cathode Connection. Current flowing into LED1 is 270/250 times the current
flowing into SET. LED4 is high impedance when EN is low.
Ground
Power supply
Enables PN6316A/B signal , H: Ative , L : Power Down .
VSET terminal is used to connect an external resistor to set output current.
The current flowing into VSET sets the bias current into
each LED by ILED_= 250 x ISET.
VSET is internally biased to 0.306V. VSET 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. 2006
Revision: B
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