Richtek RT9396GQW Schematic

RT9396

I2C Interface PMIC with 6-Channel WLED Driver and 4-LDO

General Description

The RT9396 is a power management IC (PMIC) for

backlighting and phone camera applications. The PMIC

contains a 6-Channel charge pump white LED driver and

four low dropout linear regulators.

The charge pump drives up to 6 white LEDs with regulated

constant current for uniform intensity. Each channel

(LED1 to LED6) supports up to 25mA of current. These

6-Channels can be also programmed as 4 plus 2-Channels

or 5 plus 1-Channel with different current setting for

auxiliary LED application. The RT9396 maintains highest

efficiency by utilizing a x1/ x1.5/ x2 fractional charge pump

and low dropout current regulators. An internal 6-bit DAC

is used for backlight brightness control. Users can easily

configure up to 64 steps of LED current via the I2C interface

control.

The RT9396 also comprises low noise, low dropout

regulators, which provide up to 200mA of current for each

of the four channels. The four LDOs deliver 3% output

accuracy and low dropout voltage of 200mV @ 200mA.

Users can easily configure LDO output voltage via the I2C

interface control. The LDOs also provide current limiting

and over temperature functions.

Features

zz

Tri-Mode (x1/x1.5/x2) Charge Pump

z

zz

z Maximum 25mA x 6-Channel LED Backlighting

zz

Output Current

zz

z Support Main/Sub (4+2/5+1) LED Function

zz

z 64 Steps Programmable LED Current

zz

z Support PWM Dimming Function

zz

z Fade In/Out Via I

zz

z 4 Low Dropout Regulators

zz

z Maximum 200mA x 4-Channel LDO Output Current

zz

z 16-Level LDO Output V oltage Setting

zz

2

zz

z I

C Programmable Independent LDO Channel

zz

2

C Control

ON/OFF Control

zz

z Over Temperature Protection

zz

z Thin 24-Lead WQFN Package

zz

z RoHS Compliant and Halogen Free

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Applications

z Cellular Phones

z PDAs and Smart Phones

Pin Configurations

(TOP VIEW)

The RT9396 is available in a WQFN-24L 3x3 package.

Ordering Information

RT9396

Package Type QW : WQFN-24L 3x3 (COL) (W-Type)

Lead Plating System G : Green (Halogen Free and Pb Free)

Note :

VOUT

PGND

C2N C1N C1P C2P

1

2

3

4

5

6789 1110

AGND

WQFN-24L 3x3 (COL)

LED1

VIN

LED2

LDOIN

LED3

LED5

LED4

21 20 1924 2223

18

17

SCL

16

SDA

15

EN

14

PWM

13

CF

12

LDO1 LED6

LDO2

LDO3

LDO4

Richtek products are :

 RoHS compliant and compatible with the current require-

ments of IPC/JEDEC J-STD-020.

 Suitable for use in SnPb or Pb-free soldering processes.

DS9396-01 April 2011 www.richtek.com

1

RT9396

Marking Information

JP= : Product Code

JP=YM

DNN

Typical Application Circuit

YMDNN : Date Code

V

Chip Enable

Timing Diagram

Note: PWM signal rise after internal PWMEN is enabled

BAT

I2C

PWM

2

C

I

Reg. Addr.

2

I

C

Reg. Data

C

IN2

2.2µF

LED<1:6>

Current Level

PWMEN Reg.

Main I

C

IN1

2.2µF

C

F

1µF

010

On/Off

Main BL

Internal

PWM Pin

LED

C1P C1N C2P

7

VIN

8

LDOIN

1

3

CF

1

5

EN

1

7

SCL

1

6

SDA

1

4

PWM

00000000

[1:6]

C

FLY1

1µF

4

AGND

6

C

FLY2

1µF

3

5

2

C2N

2

3

LED1

2

RT9396

LED2

2

1

LED3

2

0

LED4

1

9

LED5

1

8

LED6

2

4

VOUT

1

2

LDO1

1

LDO2

1

0

LDO3

9

LDO4

PGND

1

01011111 6CH PWM Mode

01111101 Fade in/out time = 8ms/step, I

PWM control Backlight

THi > 0.5µs

Fade in time

C

L2

1µF

C

L3

C

1µF

L4

1µF

[1~6] = 62/64 x 25mA

LED

PWM Dimming

0.5µs < T

I

[1~6] Current =

LED

62/64 x 25mA x PWM Duty

LO

T

< 500µs

SHD

C

L1

1µF

= 16m s

WLED

C

1µF

OUT

0

Time (s)

Figure 1. Timing Diagram

DS9396-01 April 2011www.richtek.com

2

RT9396

2

• I

C Writing Cycles of LDOX

2

• I

C Writing Cycles of Backlighting I (LED1~6)

1 0 1 0 1 0 0 0

2

• I

C Writing Cycles of Backlighting II (Main: LED1~5, Sub: LED6)

1 0 1 0 1 0 0 0

LDO

Address

0 0 1 B4 B3 B2 B1 B0 0 0 0 0 C3 C2 C1 C0Start Stop1 0 1 0 1 0 0 0

Backlight

Address

Backlight

Address

Backlight

Address

LDO4

PWMEN

Main

Sub

Channel

Selection

LDO3

Channel ON/OFF

LED6

Channel ON/OFF

PWMENPWMEN

LDO2

LED5

ON/OFF

LDO1

LED4

LED1~3

LED4

LED1~3

Channel ON/OFF

16-step Voltage

Setting

Fade In/Out

Setting

C7 C6 C5 C4 C3 C2 C1 C00 x x x x x0 1 0 B4 B3 B2 B1 B0

Fade In/Out Setting:

01: Every Step of Fade In/Out = 8 ms

BLON

10: Every Step of Fade In/Out = 16 ms 11: Every Step of Fade In/Out = 32 ms

Fade In/Out

Setting

C7 C6 C5 C4 C3 C2 C1 C00 x x x x x0 1 1 0 B3 B2 B1 B0

Main Fade In/Out Setting:

01: Every Step of Fade In/Out = 8 ms 10: Every Step of Fade In/Out = 16 ms

Main ON

11: Every Step of Fade In/Out = 32 ms

Fade In/Out

Setting

C7 C6 C5 C4 C3 C2 C1 C00 x x x x x0 1 1 1 0 0 0 B0

64-step Current Setting

Main 64-step Current Setting

Sub 64-step Current Setting

StopStart

2

• I

C Writing Cycles of Backlighting III (Main: LED1~4, Sub: LED5~6)

1 0 1 0 1 0 0 0

Figure 2. Control Sequences of LDO Setting and LED Dimming

Backlight

Address

Backlight

Address

Main

Sub

Channel ON/OFF

LED4

Channel ON/OFF

Sub Fade In/Out Setting:

LED6

LED1~3

LED5~6

01: Every Step of Fade In/Out = 8 ms 10: Every Step of Fade In/Out = 16 ms

Sub ON

11: Every Step of Fade In/Out = 32 ms

Fade In/Out

Setting

C7 C6 C5 C4 C3 C2 C1 C00 x x x x x1 0 0 0 B2 0 B1 B0

Main Fade In/Out Setting:

01: Every Step of Fade In/Out = 8 ms 10: Every Step of Fade In/Out = 16 ms

Main ON

11: Every Step of Fade In/Out = 32 ms

Fade In/Out

Setting

C7 C6 C5 C4 C3 C2 C1 C00 x x x x x1 0 0 1 0 0 0 B0

Sub Fade In/Out Setting:

01: Every Step of Fade In/Out = 8 ms 10: Every Step of Fade In/Out = 16 ms

Sub ON

11: Every Step of Fade In/Out = 32 ms

Main 64-step Current Setting

StopStart

Sub 64-step Current Setting

StopStart

DS9396-01 April 2011 www.richtek.com

3

RT9396

Functional Pin Description

Pin No. Pin Name Pin Function

1 PGND Charge Pump Ground.

2 C2N Fly Capa ci tor 2 Negative Conne cti on.

3 C1N Fly Capa ci tor 1 Negative Conne cti on.

4 C1P Fly Capacitor 1 Positi ve Connection.

5 C2P Fly Capacitor 2 Positi ve Connection.

6 AGND Ground for LDO1 to LDO4.

7 VIN Charge Pump Power I npu t. Con nect th is pi n to LDOIN pin.

8 LDOIN LDO Power Input. Connect this pin to VIN pin.

9 LDO4 LDO4 Out put.

10 LDO3 LDO3 Out put.

11 LDO2 LDO2 Output.

12 LDO1 LDO1 Out put.

13 CF PWM Fi lter Ca paci tor Connection.

14 PWM PWM Dimming Control Input.

15 EN Chip Enable (Active High).

16 SDA I2C Data Input.

17 SCL I2C Clock Input.

18 LED6 Current Sink for LED6.

19 LED5 Current Sink for LED5.

20 LED4 Current Sink for LED4.

21 LED3 Current Sink for LED3.

22 LED2 Current Sink for LED2.

23 LED1 Current Sink for LED1.

24 VOUT Charge Pump Output. Connect a 1μF ceramic capacitor be tween VOUT and GND.

DS9396-01 April 2011www.richtek.com

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Function Block Diagram

RT9396

VIN

CF

PWM

SDA

SCL

1MHz

Oscillator

Mode

Decision

PWM

Dimming

Shutdown

Delay

LED Ctrl.

I2C

C1P

C1N

x1/x1.5/x2

Charge Pump

Gate Driver

Current Setting

OR

Gate

LDO

Ctrl.

C2P

C2N

OVP

Soft Start

Current Source

OTP &

Current Bias

V

VOUT

LED1 LED2 LED3 LED4 LED5 LED6

OUT

EN

AGND

PGND

POR

Table 1. 16-Step LDO Output Voltage Setting

C3 C2 C1 C0

LDO1 &

LDO2 Ou tp ut

Voltag e (V)

LDO3 & LDO4

Output

Volt age (V)

0 0 0 0 1 1.1

0 0 0 1 1.1 1.2

0 0 1 0 1.2 1.4

0 0 1 1 1.3 1.7

0 1 0 0 1.5 1.8

BandGap

Reference

LDOIN

+

RES Divider

Voltage Setting

x4

C3 C2 C1 C0

LDOIN

LDO1 to LDO4

LDO1 &

LDO2 Output

Vol ta ge (V)

LDO3 & LDO4

Output

Voltage (V)

1 0 0 0 2.5 2.2

1 0 0 1 2.6 2.3

1 0 1 0 2.7 2.4

1 0 1 1 2.8 2.5

1 1 0 0 2.9 2.8

0 1 0 1 1.6 1.9

0 1 1 0 1.8 2

0 1 1 1 2.1 2.1

DS9396-01 April 2011 www.richtek.com

1 1 0 1 3 2.85

1 1 1 0 3.1 3.2

1 1 1 1 3.3 3.3

5

RT9396

Table 2. 64-Step WLED Current Setting

C5 C4 C3 C2 C1 C0

0 0 0 0 0 0 0.39

0 0 0 0 0 1 0.78

0 0 0 0 1 0 1.17

0 0 0 0 1 1 1.56

0 0 0 1 0 0 1.95

0 0 0 1 0 1 2.34

0 0 0 1 1 0 2.73

0 0 0 1 1 1 3.13

0 0 1 0 0 0 3.52

0 0 1 0 0 1 3.91

0 0 1 0 1 0 4 .3

0 0 1 0 1 1 4.69

0 0 1 1 0 0 5.08

0 0 1 1 0 1 5.47

0 0 1 1 1 0 5.86

0 0 1 1 1 1 6.25

0 1 0 0 0 0 6.64

0 1 0 0 0 1 7.03

0 1 0 0 1 0 7.42

0 1 0 0 1 1 7.81

0 1 0 1 0 0 8 .2

0 1 0 1 0 1 8.59

0 1 0 1 1 0 8.98

0 1 0 1 1 1 9.38

0 1 1 0 0 0 9.77

0 1 1 0 0 1 10 .16

0 1 1 0 1 0 10 .55

0 1 1 0 1 1 10 .94

0 1 1 1 0 0 11 .33

0 1 1 1 0 1 11 .72

0 1 1 1 1 0 12 .11

0 1 1 1 1 1 12.5

WLED

Current (mA)

C5 C4 C3 C2 C1 C0

1 0 0 0 0 0 12 .89

1 0 0 0 0 1 13 .28

1 0 0 0 1 1 14 .06

1 0 0 1 0 0 14 .45

1 0 0 1 0 1 14 .84

1 0 0 1 1 0 15 .23

1 0 0 1 1 1 15 .63

1 0 1 0 0 0 16 .02

1 0 1 0 0 1 16 .41

1 0 1 0 1 0 16.8

1 0 1 0 1 1 17 .19

1 0 1 1 0 0 17 .58

1 0 1 1 0 1 17 .97

1 0 1 1 1 0 18 .36

1 0 1 1 1 1 18 .75

1 1 0 0 0 0 19 .14

1 1 0 0 0 1 19 .53

1 1 0 0 1 0 19 .92

1 1 0 0 1 1 20 .31

1 1 0 1 0 0 20.7

1 1 0 1 0 1 21 .09

1 1 0 1 1 0 21 .48

1 1 0 1 1 1 21 .88

1 1 1 0 0 0 22 .27

1 1 1 0 0 1 22 .66

1 1 1 0 1 0 23 .05

1 1 1 0 1 1 23 .44

1 1 1 1 0 0 23 .83

1 1 1 1 0 1 24 .22

1 1 1 1 1 0 24 .61

1 1 1 1 1 1 25

WLED

Current (mA)

6

DS9396-01 April 2011www.richtek.com

Richtek RT9396GQW Schematic [ru]