T6313A-BF [TMT]

Low Noise, High Efficiency WhiteLED Charge Pump; 低噪声，高效率WhiteLED电荷泵


型号：	T6313A-BF
厂家：	TAIWAN MEMORY TECHNOLOGY
描述：	Low Noise, High Efficiency WhiteLED Charge Pump 低噪声，高效率WhiteLED电荷泵白色LED灯泵
文件：	总10页 (文件大小：90K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

tmCH

Preliminary T6313A

Low Noise, High Efficiency

WhiteLED Charge Pump

FEATURES

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 soft-

start 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.

• 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 85°C

• 16-Pin QFN

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

T6313A-AF QFN 4mm X 4mm

T6313A-BF QFN 3mm X 3mm

6313

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to change products or specifications without notice.

P. 1

Publication Date: JAN. 2006

Revision: C

tmCH

Preliminary T6313A

PIN ARRANGEMENT(Top view)

QFN- 4mm x 4mm AND 3mm x 3mm –16

SET

VIN

GND

C2 -

C2+

V_OUT

C1+

C1 -

PIN DESCRIPTION

SYMBOL

Pin no.

DESCRIPTION

QFN-16

Current source output 2

Current source output 3

Current source output 4

No Connect

N.C.

C1+

C1-

N.C.

V_OUT

C2+

C2-

GND

VIN

SET

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.

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to change products or specifications without notice.

P. 2

Publication Date: JAN. 2006

Revision:C

tmCH

Preliminary T6313A

BLOCK DIAGRAM

C1+ C1- C2+ C2-

1.5X

Charge Pump

V_OUT

1MHz/500K

Oscillator

Soft

Start

Current

Drive

SET

Interface

Control

Decoder

Fig-1

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to change products or specifications without notice.

P. 3

Publication Date: JAN. 2006

Revision:C

tmCH

Preliminary T6313A

ABSOLUTE MAXIMUM RATINGS

(T_A= 25°C 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 85°C

Storage Temperature …………………-40 to 150°C

Electrical Characteristics

(TA = -40 to 85°C unless otherwise noted. Typical values are at TA =25°C, VIN =3.5V)

Symbol

Description

Conditions

Min. Typ. Max Unit

V_IN

Input Voltage

2.7

1.4

5.5

0.4

V_{EN (low)}Enable threshold Low

V_{EN (high)}Enable threshold High

V_{SET (low)}Enable threshold Low

V_{SET (high)}Enable threshold High

V^IN=2.7 to 5.5V

0.4

I_CC

Operating Current

Active, No Load Current

EN=0

1.3

I_SHDNShutdown Supply Current

3.2V ≤ V_IN≤ 5.5V, T_A=25°C,

All Outputs Max. Current

I_out

Output Current

Current Matching between

D1 and any other outputs

I_{out_m}

VD1 : VDn=3.6V, V_IN=3.3V

0.5

I_ILENEN input leakage

V_IN= 5.5V

-1

I_ILset

SET input leakage

t_SS

Soft start time

500

t_LO

SET low time

0.5

t_OFF

t_HI

SET off time

Minimum SET high time

Efficiency

350 500

1000/

500

V_IN=3.5V, I_{OUT (total)}=40mA

Oscillator Free Running

f_OSC

Frequency

KHz

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to change products or specifications without notice.

P. 4

Publication Date: JAN. 2006

Revision:C

tmCH

Preliminary T6313A

Typical Operating Characteristics

(V^IN=+3.5V, C^IN= C^OUT=C1=C2=1uF, T^A=+25 ºC, unless otherwise noted.)

TBD

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P. 5

Publication Date: JAN. 2006

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tmCH

Preliminary T6313A

Functional Description

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).

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

I diode(mA)

Code

Fig - 2

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to change products or specifications without notice.

P. 6

Publication Date: JAN. 2006

Revision:C

tmCH

Preliminary T6313A

Table1 : current level (mA)

code

20mA max.

code

20mA max.

3.529

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

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

SET vs ILED

IL E D

3 2

3 1

C o d e

t_{O F F}> 5 0 0 u s

t_{H I}> 5 0 n s

0 .5 u s< t^{L O}< 7 5 u s

S E T

C o d e

O F F

3 2

3 1

E N

S tate

Fig.-3 Enable / Disable / LED Brightness Level Set Data Input

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P. 7

Publication Date: JAN. 2006

Revision:C

tmCH

Preliminary T6313A

TYPICAL APPLICATION CIRCUITS

C1+

C1-

SET

1uF

C2+

C2-

1uF

V_IN

C_IN

1uF

Battery

V_OUT

GND

C_OUT

1uF

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to change products or specifications without notice.

P. 8

Publication Date: JAN. 2006

Revision:C

tmCH

Preliminary T6313A

PACKAGE DIMENSIONS

QFN3mm x 3mm-16

Bottom View

TopView

Pin-1Index

Dimension in mm

Symbol

Dimension in mil

Typ.

Min.

Typ.

0.50(BSC)

0.23

Max.

Min.

Max.

19.69

0.18

0.30

1.40

0.30

0.50

1.60

7.09

11.81

55.12

9.06

11.81

19.69

62.99

0.40

15.75

1.50

59.06

0.20

8.00

0.70

2.90

0.75

0.80

3.10

0.05

27.6

114.17

29.5

31.5

122.05

1.97

3.00

118.11

0.79

3.00

0.02

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to change products or specifications without notice.

P. 9

Publication Date: JAN. 2006

Revision:C

tmCH

Preliminary T6313A

PACKAGE DIMENSIONS

QFN4mm x 4mm-16

Bottom View

TopView

Pin-1Index

Dimension in mm

Symbol

Dimension in inch

Typ.

Min.

Typ.

0.65(BSC)

0.33

Max.

Min.

Max.

0.025(BSC)

0.28

0.55

0.40

0.38

0.65

0.50

0.011

0.022

0.016

0.013

0.015

0.026

0.020

0.60

0.024

0.45

0.018

2.28(REF)

2.40

0.090(REF)

0.094

2.35

0.17

0.85

3.95

0.00

2.45

0.23

0.95

4.05

0.25

0.092

0.006

0.033

0.155

0.000

0.096

0.009

0.037

0.159

0.009

0.20

0.008

0.90

0.035

4.00

0.157

4.00

0.157

0.12

0.005

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to change products or specifications without notice.

P. 10

Publication Date: JAN. 2006

Revision:C

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