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TE CH
Preliminary T6313A
Low Noise, High Efficiency WhiteLED Charge Pump
FEATURES
* 4 Current Source Outputs * 20mA Full Scale Current for each LED * Power efficency up to 93% * 32 levels for brightness * 2 wires interface * Low Noise Constant Frequency Operation * High Accuracy Brightness Matching * White LED Backlighting * 0.5% LED current matching * Automatic Soft-Start * No External Inductors, Schottky, or Zener Diode and Resistor Required * 500KHz Switching Frequency (1MHz optional) * 2.7V to 5.5V supply voltage * Shutdown current is less 1uA * Temperature Range -40 to 85C * 16-Pin QFN
GRNERAL DESCRIPTION
The T6313A is a charge pump DC/DC converter driving a constant current up to 20mA for each LED of total four LEDs. It is a high efficiency device that is up to 93%, and it would be a suitable driving device for LED back light application. The T6313A operates in a 1.5x charge pump mode based on input voltage from 2.7v to 5.5v. Operation frequency is at fixed high frequencies either 500KHz or 1MHz typically. It can drive 4 white LEDs connected in parallel and provides tightly matched regulated current to achieve uniformity of brightness in LCD backlighting applications. The T6313A uses two input pins to enable, disable, and set the LED drive current for one of 32 levels of brightness. Also has a built-in softstart circuitry to prevent excessive inrush current during start-up. A very low shutdown current feature and a low quiescent current will consume very little power and allow the device to operate in a very high efficiency. The T6313A is available in 16-pin QFN packages.
Applications
* Cellular Phones * Portable Communication Devices * Handheld devices * Digital Cameras * PDAs * LED/Display Back Light Driver * LEDs for Camera Flash
PART NUMBER EXAMPLES
PART NO. PACKAGE Marking 6313 6313 T6313A-AF QFN 4mm X 4mm T6313A-BF QFN 3mm X 3mm
TM Technology Inc. reserves the right P. 1 to change products or specifications without notice.
Publication Date: JAN. 2006 Revision: C
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Preliminary T6313A
PIN ARRANGEMENT(Top view) QFN- 4mm x 4mm AND 3mm x 3mm -16
D1
1 6
SET
1 5
VIN
1 4
EN
1 3 1 2
D2 D3 D4 NC
1
GND C2 C2+ VOUT
2
1 1
3
1 0
4 5 6 7 8
9
NC
C1+
C1 -
NC
PIN DESCRIPTION
SYMBOL D2 D3 D4 N.C. N.C. C1+ C1N.C. VOUT C2+ C2GND EN VIN SET D1 Pin no. QFN-16 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 DESCRIPTION
Current source output 2 Current source output 3 Current source output 4 No Connect No Connect Flying capacitor 1 + terminal Flying capacitor 1 - terminal No Connect Charge pump output. Requires 1uF bypass capacitor to ground. Flying capacitor 2 + terminal Flying capacitor 2 - terminal Ground Enable T6313A signal, H:active, L:power down Input power supply. Requires 1uF bypass capacitor to ground. Set brightness level Current source output 1.Required reference current source.
TM Technology Inc. reserves the right P. 2 to change products or specifications without notice.
Publication Date: JAN. 2006 Revision:C
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Preliminary T6313A
BLOCK DIAGRAM
C1+
C1-
C2+ C2-
1.5X Charge Pump
VOUT
1MHz/500K Oscillator
Soft Start
EN SET
Interface Control
Decoder
Current Drive
D1 D2 D3 D4
Fig-1
TM Technology Inc. reserves the right P. 3 to change products or specifications without notice.
Publication Date: JAN. 2006 Revision:C
tm
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Preliminary T6313A
ABSOLUTE MAXIMUM RATINGS (TA = 25C unless otherwise noted)
IN, OUT, EN to GND .....................-0.3V to 6V LED1 ~4 to GND .....................-0.3V to (Vin+0.3V) Operating Temperature .....................-40 to 85C Storage Temperature .....................-40 to 150C
Electrical Characteristics
(TA = -40 to 85C unless otherwise noted. Typical values are at TA =25C, VIN =3.5V)
Symbol VIN
Description Input Voltage
Conditions VIN=2.7 to 5.5V VIN=2.7 to 5.5V VIN=2.7 to 5.5V VIN=2.7 to 5.5V Active, No Load Current EN=0 3.2V VIN 5.5V, TA=25C, All Outputs Max. Current VD1 : VDn=3.6V, VIN=3.3V VIN= 5.5V VIN= 5.5V
Min. Typ. Max 2.7 1.4 0.4 1.4 1.3 2 1 18 20 0.5 -1 -1 500 0.5 350 50 500 1 1 22 5.5 0.4
Unit V V V V V mA uA mA % uA uA us us us ns % KHz
VEN (low) Enable threshold Low VEN (high) Enable threshold High VSET (low) Enable threshold Low VSET (high) Enable threshold High ICC ISHDN Iout Iout_m IILEN IILset tSS tLO tOFF tHI Operating Current Shutdown Supply Current Output Current Current Matching between D1 and any other outputs EN input leakage SET input leakage Soft start time SET low time SET off time Minimum SET high time Efficiency Frequency
fOSC
VIN=3.5V, IOUT (total) =40mA Oscillator Free Running
93 1000/ 500
TM Technology Inc. reserves the right P. 4 to change products or specifications without notice.
Publication Date: JAN. 2006 Revision:C
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TBD
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Preliminary T6313A
Typical Operating Characteristics
(VIN=+3.5V, CIN= COUT=C1=C2=1uF, TA=+25 C, unless otherwise noted.)
TM Technology Inc. reserves the right P. 5 to change products or specifications without notice.
Publication Date: JAN. 2006 Revision:C
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TE CH
Preliminary T6313A
Functional Description
The T6313A uses a fractional (x1.5) conversion charge pump to generate a voltage for the regulated current sinks. These current sinks are used to ensure a constant current for each LED. The charge pump can generate total 80 mA of output current, so each of the 4 LED outputs can be powered with up to 20 mA of current. The T6313A uses two wires to enable and set the LED currents. The EN pin is used to either enabling or disabling the T6313A. When EN is high, then the numbers of pulse shift from SET pin are valid and an internal counter counts up from 1 from the
first rising edge of SET and increases by one when another rising edge of SET is shifted in. The outputs of the counter will map to 32 levels of LED current. Each level (code) is mapped to a different current, which is a defferent brightness (Fig-2 & Tabel1). Once the final clock cycle is input for the desired brightness level, the SET pin is held high to maintain the device output current at the programmed level. The device is disabled 350us after the SET pin transitions to a logic low state. A level will stay until EN goes low. T6313A is power down when EN goes low. After EN goes low then any pulse shifting from SET pin is invalid (Fig-3).
I diode(mA) 25 20 15 10 5 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 Code Fig - 2
TM Technology Inc. reserves the right P. 6 to change products or specifications without notice. Publication Date: JAN. 2006 Revision:C
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code 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
TE CH
20mA max. 0.549 0.627 0.706 0.784 0.863 1.020 1.098 1.255 1.412 1.569 1.804 1.961 2.275 2.510 2.824 3.137 code 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
Preliminary T6313A
20mA max. 3.529 4.000 4.471 5.020 5.647 6.353 7.059 7.922 8.941 10.039 11.216 12.627 14.118 15.843 17.804 20.000
Table1 : current level (mA)
SET vs ILED
IL E D 32 31
4 3 2 1 0 .5 u s < t L O < 7 5 u s SET C ode 1 2 3 4 31 32 1 OFF t H I> 5 0 n s 1 tO FF> 5 0 0 u s C ode
EN S ta te
Fig.-3 Enable / Disable / LED Brightness Level Set Data Input
TM Technology Inc. reserves the right P. 7 to change products or specifications without notice.
Publication Date: JAN. 2006 Revision:C
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Preliminary T6313A
TYPICAL APPLICATION CIRCUITS
SET EN
SET EN
C1+ C1C2+ C2D1 D2 D3 D4
C1 1uF C2 1uF
V IN Battery C IN 1uF C OUT 1uF V OUT
GND
TM Technology Inc. reserves the right P. 8 to change products or specifications without notice.
Publication Date: JAN. 2006 Revision:C
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TE CH
Preliminary T6313A
PACKAGE DIMENSIONS QFN3mm x 3mm-16
Top Vi ew Pin-1 Index B 12 A D 9 8 G 5 4 13 B otom V i t ew Pin-1 Index A1 16 1
C
H C1
C2
Symbol A A1 B C C1 C2 D G H
Min. 0.18 0.30 1.40 0.70 2.90 2.90 0
Dimension in mm Typ. 0.50(BSC) 0.23 0.40 1.50 0.20 0.75 3.00 3.00 0.02
Max. 0.30 0.50 1.60 0.80 3.10 3.10 0.05
Min. 7.09 11.81 55.12 27.6 114.17 114.17 0
Dimension in mil Typ. 19.69 9.06 15.75 59.06 8.00 29.5 118.11 118.11 0.79
Max. 11.81 19.69 62.99 31.5 122.05 122.05 1.97
TM Technology Inc. reserves the right P. 9 to change products or specifications without notice.
Publication Date: JAN. 2006 Revision:C
tm
TE CH
Preliminary T6313A
PACKAGE DIMENSIONS QFN4mm x 4mm-16
Top Vi ew Pin-1 Index B 12 A D 9 8 G B2 5 4 13 B otom V i t ew Pin-1 Index A1 16 1 B1
C
H C1
C2
Symbol A A1 B B1 B2 C C1 C2 D G H
Min. 0.28 0.55 0.40 2.35 0.17 0.85 3.95 3.95 0.00
Dimension in mm Typ. 0.65(BSC) 0.33 0.60 0.45 2.28(REF) 2.40 0.20 0.90 4.00 4.00 0.12
Max. 0.38 0.65 0.50 2.45 0.23 0.95 4.05 4.05 0.25
Min. 0.011 0.022 0.016 0.092 0.006 0.033 0.155 0.155 0.000
Dimension in inch Typ. 0.025(BSC) 0.013 0.024 0.018 0.090(REF) 0.094 0.008 0.035 0.157 0.157 0.005
Max. 0.015 0.026 0.020 0.096 0.009 0.037 0.159 0.159 0.009
TM Technology Inc. reserves the right P. 10 to change products or specifications without notice.
Publication Date: JAN. 2006 Revision:C

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