Richtek RT8239AGQW, RT8239AZQW, RT8239BGQW, RT8239BZQW, RT8239CGQW Schematic [ru]

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RT8239A/B/C

High Efficiency, Main Power Supply Controller for Notebook Computers

General Description

The RT8239A/B/C is a dual step down, Switch Mode Power Supply (SMPS) controller which generates logic supply voltages for battery powered systems. It includes two Pulse Width Modulation (PWM) controllers adjustable from 2V to 5.5V and also two fixed 5V/3.3V linear regulators. One of the controllers (LDO5) provides automatic switch over to the BYP1 input connected to the main SMPS1 output for maximized efficiency. An optional external charge pump can be monitored through SECFB (RT8239B/C). Other features include on board power up sequencing, a power good output, internal softstart, and a soft discharge output that prevents negative voltage during shutdown.

A constant on-time PWM control scheme operates without sense resistors and assures fast load transient response while maintaining nearly constant switching frequency. To eliminate noise in audio applications, an ultrasonic mode is included, which maintains the switching frequency above 25kHz. Moreover, a diode emulation mode maximizes efficiency for light load applications. The SMPS1/SMPS2 switching frequency can be adjustable from 200kHz/233kHz to 400kHz/466kHz respectively.

The RT8239A/B/C is available in a WQFN-20L 3x3 package, and operates over an extended temperature range from −40°C to 85°C.

Features

z5.5V to 25V Input Voltage Range

z2V to 5.5V Output Voltage Range

zNo Current Sense Resistor Needed

z5V/3.3V Linear Regulators

z4700ppm/°C RDS(ON) Current Sensing

zInternal Current Limit Soft-Start and Soft Discharge Output

zBuilt In OVP/UVP/OCP

zSelectable Operation Mode with Switcher Enable Control (RT8239A)

zSECFB Input Maintains Charge Pump Voltage (RT8239B/C)

zPower Good Indicator (RT8239B/C includes SECFB)

zRoHS Compliant and Halogen Free

Applications

zNotebook computers

zSystem Power Supplies

z3- and 4- Cell Li+ Battery-Powered Device

Ordering Information

RT8239A/B/C

Package Type

QW : WQFN-20L 3x3 (W-Type)

Lead Plating System

G : Green (Halogen Free and Pb Free)

Z : ECO (Ecological Element with

Halogen Free and Pb free)

Pin Function With

A : ENM

B : SECFB

C : SECFB, Ultrasonic Mode

Note :

Richtek products are :

`RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.

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

Copyright ©2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

DS8239A/B/C-06 October 2012

www.richtek.com

 

1

RT8239A/B/C

Pin Configurations

 

BYP1 BOOT1 UGATE1 PHASE1 LGATE1

 

 

20 19

18 17

16

 

FB1

1

 

 

 

15

LDO3

ENTRIP1

2

GND

14

LDO5

TON

3

13

ENM

ENTRIP2

4

 

 

21

12

ENLDO

FB2

5

 

 

 

11

VIN

 

6

7

8

9

10

 

 

PGOOD

BOOT2

UGATE2

PHASE2

LGATE2

 

 

RT8239A

 

 

Marking Information

RT8239A

JB= : Product Code

JB=YM YMDNN : Date Code

DNN

JB : Product Code

JB YM YMDNN : Date Code

DNN

RT8239C

JD= : Product Code

JD=YM YMDNN : Date Code

DNN

JD : Product Code

JD YM YMDNN : Date Code

DNN

(TOP VIEW)

WQFN-20L 3x3

 

BYP1 BOOT1 UGATE1 PHASE1 LGATE1

 

 

20 19

18 17

16

 

FB1

1

 

 

 

15

LDO3

ENTRIP1

2

GND

14

LDO5

TON

3

13

SECFB

ENTRIP2

4

 

 

21

12

ENLDO

FB2

5

 

 

 

11

VIN

 

6

7

8

9

10

 

 

PGOOD

BOOT2

UGATE2

PHASE2

LGATE2

 

 

RT8239B/C

 

RT8239B

JC= : Product Code

JC=YM YMDNN : Date Code

DNN

JC : Product Code

JC YM YMDNN : Date Code

DNN

Copyright ©2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS8239A/B/C-06 October 2012

2

 

RT8239A/B/C

Typical Application Circuit

 

V

 

 

 

 

 

 

 

 

 

 

 

IN

 

 

 

 

 

 

 

 

 

 

5.5V to 25V

 

 

 

 

 

 

 

 

 

 

 

C1

R1

 

RT8239A

 

 

 

C6

 

 

10µF

 

11

VIN

UGATE2

8

 

N3

10µF

 

 

 

 

C2

 

 

 

 

 

 

12

ENLDO

 

7

R5

 

 

 

 

 

 

0.1µF

BOOT2

 

 

 

 

 

 

 

18

 

 

 

 

 

 

 

 

N1

 

UGATE1

 

 

C7

 

L2

 

 

 

 

R2

19

 

PHASE2

9

0.1µF

 

VOUT2

 

 

 

BOOT1

 

 

+

 

 

 

C4

 

LGATE2

10

 

 

3.3V

 

L1

 

 

 

 

N4

C8

 

V

 

0.1µF

17

 

 

 

 

 

R6

 

OUT1

+

 

 

PHASE1

 

 

 

 

 

5V

 

 

16

 

 

 

 

6.5k

 

 

C3

N2

 

LGATE1

FB2

5

R8

 

 

 

 

R3

 

 

 

 

 

 

 

R7

 

 

 

 

 

 

 

 

100k

 

 

 

15k

 

 

 

 

 

4

 

 

 

 

 

 

 

ENTRIP2

 

10k

 

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FB1

 

 

R9

 

 

 

 

 

 

 

 

 

 

 

 

 

 

R4

 

 

 

 

2

100k

 

 

 

 

 

RTON

3

 

ENTRIP1

 

 

 

 

 

TON

 

 

 

 

 

10k

 

 

15

 

 

 

 

 

 

 

 

20

BYP1

LDO3

C9

 

3.3V Always On

 

 

C5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4.7µF

 

 

 

 

1µF

Chip Enable

13

ENM

 

14

 

 

 

 

 

 

LDO5

R10

C10

5V Always On

 

 

 

 

 

 

 

 

 

 

 

 

 

 

21 (Exposed Pad) GND

PGOOD

6

100k

10µF

 

 

 

 

 

 

 

 

 

Figure 1. RT8239ANB Main Supply Typical Application Circuit

Copyright ©2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

DS8239A/B/C-06 October 2012

www.richtek.com

3

RT8239A/B/C

 

 

 

 

 

 

 

 

 

V

 

 

 

 

 

 

 

 

 

 

IN

 

 

 

 

 

 

 

 

 

5.5V to 25V

 

 

 

 

 

 

 

 

 

 

 

C1

R1

 

RT8239B/C

 

 

 

C6

 

 

10µF

 

11 VIN

UGATE2 8

 

N3

10µF

 

 

 

C2

 

 

 

 

 

12 ENLDO

 

7

R5

 

 

 

 

 

0.1µF

BOOT2

 

 

 

 

 

 

18 UGATE1

 

 

 

 

 

 

N1

 

 

 

C7

 

L2

 

 

 

R2

19

 

PHASE2 9

0.1µF

 

 

 

 

BOOT1

 

 

+

 

 

 

 

 

LGATE2 10

 

 

 

 

L1

C4

 

 

 

N4

C8

VOUT1

 

0.1µF

17 PHASE1

 

 

 

 

R6

+

 

 

 

 

 

 

5V

 

 

16 LGATE1

FB2 5

 

 

6.5k

 

C3

N2

 

R8

 

 

 

 

R3

 

 

 

 

 

 

R7

 

 

 

 

 

 

 

100k

 

 

 

15k

 

 

 

ENTRIP2 4

 

 

 

 

 

 

 

10k

 

 

 

1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FB1

 

 

R9

 

 

 

 

 

 

 

 

 

 

 

 

 

R4

 

 

 

2

100k

 

 

 

 

RTON

3 TON

ENTRIP1

 

 

 

 

 

 

On

 

 

10k

 

 

 

 

 

 

 

 

20 BYP1

 

 

 

 

Off

C5

 

 

C11

 

 

 

 

 

 

 

 

 

 

15

 

 

 

1µF

 

 

 

 

LDO3

 

 

3.3V Always On

C13

 

0.1µF

 

 

C9

 

 

 

 

 

 

 

 

 

 

 

0.1µF

 

C12

 

 

 

 

4.7µF

 

 

 

 

 

 

 

LDO5 14

 

 

5V Always On

 

 

 

0.1µF

 

 

R10

C10

 

 

 

 

 

 

 

 

10µF

 

 

 

 

R11

 

 

PGOOD 6

100k

 

 

 

C14

 

 

 

 

 

 

 

 

200k

13 SECFB

 

 

 

 

0.1µF

 

 

GND

21 (Exposed Pad)

 

 

 

 

 

 

R12

 

 

 

 

 

C15

 

39k

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOUT2 3.3V

VCP

Figure 2. RT8239B/C NB Main Supply Typical Application Circuit

Copyright ©2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS8239A/B/C-06 October 2012

4

 

RT8239A/B/C

Functional Pin Description

Pin No.

Pin Name

 

Pin Function

1

FB1

SMPS1 Feedback Input. Connect FB1 to a resistive voltage divider from SMPS1

output to GND for adjustable output from 2V to 5.5V.

 

 

 

 

Channel 1 Enable and Current Limit Setting Input. Connect resistor to GND to set

2

ENTRIP1

the threshold for Channel 1 synchronous RDS(ON) sense. The GND-PHASE1

current limit threshold is 1/10th the voltage seen at ENTRIP1 over a 0.5V to 3V

 

 

range. There is an internal 10μA current source from LDO5 to ENTRIP1. Leave

 

 

ENTRIP1 floating or drive it above 4.5V to shut down channel 1.

3

TON

ON-Time/Frequency Adjustment Input. Connect to GND with 56kΩ to 100kΩ.

 

 

 

 

 

Channel 2 Enable and Current Limit Setting Input. Connect resistor to GND to set

4

ENTRIP2

the threshold for Channel 2 synchronous RDS(ON) sense. The GND-PHASE2

current limit threshold is 1/10th the voltage seen at ENTRIP2 over a 0.5V to 3V

 

 

range. There is an internal 10μA current source from LDO5 to ENTRIP2. Leave

 

 

ENTRIP2 floating or drive it above 4.5V to shut down channel 2.

5

FB2

SMPS2 Feedback Input. Connect FB2 to a resistive voltage divider from SMPS2

output to GND for adjustable output from 2V to 5.5V.

 

 

6

PGOOD

Power Good Output for Channel 1 and Channel 2 (RT8239A).

 

 

Power Good Output for Channel 1, Channel 2 and SECFB (RT8239B/C).

 

 

7

BOOT2

Boost Flying Capacitor Connection for SMPS2. Connect to an external capacitor

according to the typical application circuits.

 

 

8

UGATE2

Upper Gate Driver Output for SMPS2. UGATE2 swings between PHASE2 and

BOOT2.

 

 

 

 

9

PHASE2

Switch Node for SMPS2. PHASE2 is the internal lower supply rail for the UGATE2

high side gate driver. PHASE2 is also the current sense input for the SMPS2.

 

 

10

LGATE2

Lower Gate Drive Output for SMSP2. LGATE2 swings between GND and LDO5.

11

VIN

Supply Input for LDO5.

 

 

 

Master Enable Input. LDO5/LDO3 is enabled if it is within logic high level and

12

ENLDO

disabled if it is less than the logic low level. Leave ENLDO floating to default

 

 

enable LDO5/LDO3.

 

 

ENM

Mode Selection with Enable Input. Pull up to LDO5 (Ultrasonic mode) or LDO3

 

(RT8239A)

(DEM) to turn on both switch Channels. Short to GND for shutdown.

 

 

Change Pump Feedback Pin. The SECFB is used to monitor the optional external

13

 

charge pump. Connect a resistive divider from the change pump output to GND to

SECFB

detect the output. If SECFB drops below its feedback threshold, an ultrasonic

 

pulse occurs to refresh the charge pump driven by LGATE1 or LGATE2.

 

(RT8239B/C)

 

If SECFB drops below its UV threshold, the switcher channels stop working and

 

 

enter into discharge-mode. Pull up to LDO5 or LDO3 to disable SECFB UVP

 

 

function.

 

 

 

5V Linear Regulator Output. LDO5 is the supply voltage for the low side MOSFET

14

LDO5

driver and also the analog supply voltage for the device. Bypass a minimum 4.7μF

 

 

ceramic capacitor to GND

 

15

LDO3

3.3V Linear Regulator Output. Bypass a minimum 4.7μF ceramic capacitor to

GND.

 

 

 

 

16

LGATE1

Lower Gate Driver Output for SMPS1. LGATE1 swings between GND and LDO5.

17

PHASE1

Switch Node SMPS1. PHASE1 is the internal lower supply rail for the UGATE1

high side gate driver. PHASE1 is also the current sense input for the SMPS1.

 

 

 

 

 

 

Copyright ©2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

DS8239A/B/C-06

October 2012

 

www.richtek.com

 

 

 

5

Richtek RT8239AGQW, RT8239AZQW, RT8239BGQW, RT8239BZQW, RT8239CGQW Schematic

RT8239A/B/C

Pin No.

Pin Name

Pin Function

18

UGATE1

Upper Gate Driver Output for SMPS1. UGATE1 swings between PHASE1 and

BOOT1.

 

 

19

BOOT1

Boost Flying Capacitor Connection for SMPS1. Connect to an external

capacitor according to the typical application circuits.

 

 

20

BYP1

Switch Over Source Voltage Input for LDO5.

21 (Exposed Pad)

GND

Analog Ground and Power Ground. The exposed pad must be soldered to a

large PCB and connected to GND for maximum power dissipation.

 

 

Function Block Diagram

BOOT1

 

 

 

BOOT2

UGATE1

 

 

 

UGATE2

PHASE1

LDO5

 

LDO5

PHASE2

 

 

 

 

SMPS1

SMPS2

 

 

LGATE1

PWM

PWM

 

LGATE2

Buck

Buck

 

 

Controller

Controller

LDO5

 

 

LDO5

 

 

 

 

 

 

 

10µA

 

10µA

 

 

 

 

FB2

FB1

 

 

 

 

 

 

ENTRIP2

ENTRIP1

 

 

 

 

 

 

 

TON

On Time

 

 

ENM (RT8239A)

 

Switch Over Threshold

 

 

SECFB (RT8239B/C)

BYP1

 

 

 

 

 

 

 

 

+ -

 

 

PGOOD

 

 

 

 

GND

LDO5

 

 

 

 

 

LDO5

REF

LDO3

LDO3

VIN

 

Power-On

 

 

 

Sequence

 

 

ENLDO

 

 

 

 

Clear Fault Latch

 

 

Copyright ©2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

DS8239A/B/C-06 October 2012

6

 

 

 

 

 

 

RT8239A/B/C

Absolute Maximum Ratings

(Note 1)

 

 

 

 

 

 

z VIN, ENLDO to GND ------------------------------------------------------------------------------------------------------

 

 

 

 

 

 

−0.3V to 30V

z BOOTx to PHASEx -------------------------------------------------------------------------------------------------------

 

 

 

 

 

 

−0.3V to 6V

z ENTRIPx, FBx, TON, BYP1, PGOOD, LDO5, LDO3, ENM/SECFB to GND -------------------------------

 

 

−0.3V to 6V

z PHASEx to GND

 

 

 

 

 

 

 

 

 

DC -----------------------------------------------------------------------------------------------------------------------------

 

 

 

 

 

 

−0.3V to 30V

< 20ns -----------------------------------------------------------------------------------------------------------------------

 

 

 

 

 

 

−8V to 38V

z UGATEx to PHASEx

 

 

 

 

 

 

 

 

 

DC -----------------------------------------------------------------------------------------------------------------------------

 

 

 

 

 

 

−0.3V to 6V

< 20ns -----------------------------------------------------------------------------------------------------------------------

 

 

 

 

 

 

−5V to 7.5V

z LGATEx to GND

 

 

 

 

 

 

 

 

 

DC -----------------------------------------------------------------------------------------------------------------------------

 

 

 

 

 

 

−0.3V to 6V

< 20ns -----------------------------------------------------------------------------------------------------------------------

 

 

 

 

 

 

−2.5V to 7.5V

z Power Dissipation, PD @ TA = 25°C

 

 

 

 

 

 

 

WQFN-20L 3x3 ------------------------------------------------------------------------------------------------------------

 

 

 

 

 

 

3.33W

 

z Package Thermal Resistance

(Note 2)

 

 

 

 

 

 

 

WQFN-20L 3x3, θJA -------------------------------------------------------------------------------------------------------

 

 

 

 

 

 

30°C/W

 

WQFN-20L 3x3, θJC ------------------------------------------------------------------------------------------------------

 

 

 

 

 

 

7.5°C/W

 

z Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------

 

 

 

 

260°C

 

z Junction Temperature -----------------------------------------------------------------------------------------------------

 

 

 

 

 

 

150°C

 

z Storage Temperature Range --------------------------------------------------------------------------------------------

 

 

 

 

 

 

−65°C to 150°C

z ESD Susceptibility (Note 3)

 

 

 

 

 

 

 

 

 

HBM (Human Body Model) ----------------------------------------------------------------------------------------------

 

 

 

 

 

 

2kV

 

Recommended Operating Conditions

(Note 4)

 

 

 

 

 

z Supply Input Voltage, VIN -----------------------------------------------------------------------------------------------

 

 

 

 

 

 

5.5V to 25V

z Junction Temperature Range --------------------------------------------------------------------------------------------

 

 

 

 

 

 

−40°C to 125°C

z Ambient Temperature Range --------------------------------------------------------------------------------------------

 

 

 

 

 

 

−40°C to 85°C

Electrical Characteristics

 

 

 

 

 

 

 

(VIN = 12V, VENLDO = 5V, VENTRIPx = 2V, VBYP1 = 5V, No Load on LDO5, LDO3, TA = 25°C, unless otherwise specified)

 

 

 

 

 

 

 

 

 

 

Parameter

 

Symbol

Test Conditions

Min

Typ

Max

 

Unit

Input Supply

 

 

 

 

 

 

 

 

 

VIN Power On Reset

 

 

Rising Threshold

--

5.1

5.5

 

V

 

 

Falling Threshold

3.5

--

4.5

 

 

 

 

 

 

VIN Shutdown Current

 

IVIN_SHDN

VENLDO = GND

--

20

40

 

μA

VIN Standby Supply Current

 

IVIN_SBY

Both SMPS Off

--

250

350

 

 

 

 

 

 

 

 

 

 

 

 

 

Quiescent Power Consumption

 

IQ

Both SMPSs on, FBx = 2.1V,

--

5

7

 

mW

 

BYP1 = 5V, ENM = 3.3V (RT8239A)

 

 

 

 

 

 

 

 

 

SMPS Output and FB Voltage

 

 

 

 

 

 

 

 

 

FBx Regulation Voltage

 

VFBx

FBx, CCM Operation

--

2

--

 

V

 

 

 

 

 

 

 

 

FBx, DEM Operation

1.98

2.006

2.03

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Copyright ©2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

 

DS8239A/B/C-06 October 2012

 

 

 

 

 

 

www.richtek.com

 

 

 

 

 

 

 

 

 

7

RT8239A/B/C

Parameter

Symbol

Test Conditions

Min

Typ

 

Max

Unit

Output Voltage Adjustable

 

SMPS1, SMPS2

 

2

--

 

5.5

 

Range

 

 

 

V

 

 

 

 

 

 

 

 

SECFB Voltage

VSECFB

RT8239B

 

1.92

2

 

2.08

 

On-Time

 

 

 

 

 

 

 

 

 

On-Time Pulse Width

tUGATEx

VIN = 20V

 

VPHASE1 = 2V

--

256

 

--

ns

RTON = 56kΩ

 

VPHASE2 = 2V

--

220

 

--

 

 

 

 

 

Minimum Off-Time

tLGATEx

VFBx = 1.8V

 

--

--

 

400

ns

Frequency Range

fSMPS1

SMPS1 Operating Frequency

200

--

 

400

kHz

fSMPS2

SMPS2 Operating Frequency

233

--

 

466

 

 

 

Ultrasonic Mode Frequency

fASM

RT8239C, VPHASEx = 50mV

25

--

 

--

kHz

Soft-Start

 

 

 

 

 

 

 

 

 

Soft-Start Time

tSSx

Zero to 200mV Current Limit Threshold

--

2

 

--

ms

from ENTRIPx Enable

 

 

 

 

 

 

 

 

Current Sense

 

 

 

 

 

 

 

 

 

Current Limit Current Source

IENTRIPx

VENTRIPx = 0.9V

 

9.4

10

 

10.6

μA

Temperature Coefficient of

 

On The Basis of 25°C

--

4700

 

--

ppm/°C

IENTRIPx

 

 

 

 

 

 

 

 

 

 

 

Current Limit Adjustment

 

VENTRIPx = IENTRIPx x RENTRIPx

0.5

--

 

2.7

V

Range

 

 

 

 

 

 

 

 

 

 

 

Current Limit Threshold

VENTRIPx

GND − PHASEx, VENTRIPx = 2V

180

200

 

225

mV

Zero-Current Threshold

VZC

GND − PHASEx, FBx = 2.1V

--

3

 

--

mV

Internal Regulator and Reference

 

 

 

 

 

 

 

 

 

 

VBYP1 = 0V, ILDO5 < 100mA

4.8

5

 

5.2

 

LDO5 Output Voltage

VLDO5

VBYP1 = 0V, ILDO5 < 100mA ,

4.75

--

 

5.25

V

6.5V < VIN < 25V

 

 

 

 

 

 

 

VBYP1 = 0V, ILDO5 < 50mA,

4.75

--

 

5.25

 

 

 

5.5V < VIN < 25V

 

 

 

 

 

 

 

 

 

LDO5 Output Current

ISHORT5

VBYP1 = 0V, VLDO5 = 4.5V

--

225

 

--

mA

5V Switchover Threshold

VBYP1TH

Falling Edge, Rising Edge with FB1

4.53

4.66

 

4.79

V

Regulation Point

 

 

 

 

 

 

 

 

 

 

5V Switch RDS(ON)

RBYPSW

VBYP1 = 5V, ILDO5 = 50mA

--

1.5

 

3

Ω

LDO3 Output Voltage

VLDO3

VBYP1 = 0V, ILDO3 < 100mA

3.2

3.3

 

3.46

V

VBYP1 = 5V, ILDO3 < 100mA

3.2

3.3

 

3.46

 

 

 

 

 

LDO3 Output Current

ISHORT3

VBYP1 = 0V, VLDO3 = 2.9V

--

150

 

--

mA

UVLO

 

 

 

 

 

 

 

 

 

LDO5 UVLO Threshold

VUVLO5

Rising Edge

 

--

4.35

 

4.5

V

Falling Edge

 

3.9

4.05

 

4.2

 

 

 

 

 

LDO3 UVLO Threshold

VUVLO3

Both SMPS Off

 

--

2.2

 

--

 

Power Good

 

 

 

 

 

 

 

 

 

PGOOD Threshold

VPGOOD

PGOOD Detect, Rising edge with

−14

−10

 

−6

%

soft-start delay time. Hysteresis = 2.5%

 

PGOOD Propagation Delay

tPD_PGOOD

Falling Edge

 

--

5

 

--

μs

 

 

 

 

 

 

 

 

 

 

Copyright ©2012 Richtek Technology Corporation. All rights reserved.

is a registered trademark of Richtek Technology Corporation.

www.richtek.com

 

 

 

 

DS8239A/B/C-06

October 2012

8

 

 

 

 

 

 

 

 

 

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