RichTek RT9002A, RT9002B, RT9002C Technical data

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RT9002A

RT9002A/B/C

Dual Low-Dropout Regulator with Detector

General Description

The RT9002A/B/C is a dual-channel, low noise, and low dropout regulator. The first regulator is capable of sourcing 240mA, while the second regulator can source up to 500mA and includes a voltage detection function. The RT9002A/B/C performance is optimized for CD/DVD-ROM, CD/RW or wireless communication supply applications. The RT9002A/B/C regulator is stable with output capacitors as low as 1μF. The other features include high output accuracy, ultra-fast transient response, tight load and line regulation, current limiting/thermal protection and high ripple rejection ratio. The RT9002A/B/C is available in SOP-8 package requiring minimum board space and smallest components.

Ordering Information

RT9002A/B/C -

Package Type S : SOP-8

Operating Temperature Range

P : Pb Free with Commercial Standard G : Green (Halogen Free with Commer-

cial Standard)

Output Voltage : VOUT1/VOUT2 A : 2.5V/3.3V

B : 1.5V/2.8V

C : 2.5V/3.3V

Note :

RichTek Pb-free and Green 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. `100% matte tin (Sn) plating.

Features

zLow Quiescent Current (Typically 70μA)

zWide Operating Voltage Ranges : 2.5V to 5.5V

zUltra-Fast Transient Response

zTight Load and Line Regulation

zCurrent Limiting Protection

zThermal Shutdown Protection

zOnly low-ESR Ceramic Capacitors Required for Stability

zCustom LDO VOUT1, VOUT2 Voltage Available from 1.5V to 3.3V

zCustom VIN Detector Available from 3.5V to 4.0V

zRoHS Compliant and 100% Lead (Pb)-Free

Applications

zCD/DVD-ROM, CD/RW

zWireless LAN Card/Keyboard/Mouse

zBattery-Powered Equipment

zXDSL Router

Pin Configurations

(TOP VIEW)

VIN1

 

 

2

8

 

 

EN1

 

 

 

VOUT1

 

 

7

 

 

GND

 

 

Cd

 

 

3

6

 

 

VDOUT

 

 

VIN2

 

 

4

5

 

 

VOUT2

 

 

 

 

 

 

 

 

 

 

SOP-8

Typical Application Circuit

VIN1

 

 

 

 

 

1

VIN1

 

 

 

 

VOUT1

2

 

 

 

 

 

 

 

 

 

 

 

 

 

VOUT1

CIN1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

COUT1

 

 

 

 

 

 

 

RT9002A/B/C

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1uF

 

 

 

 

 

 

 

 

 

 

 

Cd

3

 

 

 

 

 

 

 

 

 

 

 

 

1uF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Cd

 

 

 

 

 

 

 

 

 

 

 

 

R1

 

Chip Enable

8

EN1

 

 

 

 

VDOUT

6

 

 

 

 

 

 

 

 

 

 

 

 

100k

VIN2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDOUT

VIN2

CIN2

 

 

4

VIN2

 

 

 

 

VOUT2

5

 

 

 

 

 

 

 

 

 

 

 

 

COUT2

VOUT2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1uF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

 

 

 

 

 

 

 

 

 

 

 

 

 

1uF

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

DS9002ABC-03 March 2007

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

www.richtek.com

1

RichTek RT9002A, RT9002B, RT9002C Technical data

RT9002A/B/C

Functional Pin Description

Pin No.

Pin Name

 

Pin Function

1

VIN1

Channel 1

Supply Input.

2

VOUT1

Channel 1

Output Voltage.

3

Cd

Delay Capacitor.

4

VIN2

Channel 2

Supply Voltage.

5

VOUT2

Channel 2

Output Input.

6

VDOUT

Detector Output Voltage. (RT9002A = Active High, RT9002B and RT9002C = Active Low)

 

 

 

7

GND

Common Ground.

8

EN1

Chip Enable (Active High) for Channel 1.

 

 

 

 

Function Block Diagram

EN1

Shutdown

 

VIN1

 

 

 

 

 

 

 

and

 

 

 

 

 

Logic Control

 

 

 

 

VREF

 

 

 

 

 

+

MOS Driver

 

 

 

 

-

 

 

 

 

 

Error

 

VOUT1

 

 

 

Amplifier

Current-Limit

 

 

 

 

 

 

 

 

 

and

 

 

 

 

 

Thermal

 

 

 

 

 

Protection

 

 

 

 

 

 

VIN2

 

 

 

+

MOS Driver

 

 

 

Cd

-

 

 

 

 

Error

 

VOUT2

 

 

 

Amplifier

Current-Limit

 

 

 

 

and

 

 

 

 

 

Thermal

 

 

 

 

VREF

Protection

 

 

 

 

 

 

 

 

VDOUT

 

 

 

 

 

 

-

 

 

 

 

 

+

 

GND

 

 

 

VD

 

 

 

 

 

Comparator

 

 

 

 

www.richtek.com

 

 

DS9002ABC-03

March

2007

2

 

 

 

 

 

 

 

 

 

 

 

 

RT9002A/B/C

 

Absolute Maximum Ratings (Note 1)

 

 

 

 

 

 

 

z Supply Input Voltage --------------------------------------------------------------------------------------------------

 

 

 

 

6V

 

 

 

 

z Package Thermal Resistance (Note 4)

 

 

 

 

 

 

 

 

SOP-8, θJA --------------------------------------------------------------------------------------------------------------

 

 

 

 

 

 

 

110°C/W

 

 

z Power Dissipation, PD @ TA = 25°C

 

 

 

 

 

 

 

 

 

SOP-8 --------------------------------------------------------------------------------------------------------------------

 

 

 

 

 

 

 

0.909W

 

 

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 2)

 

 

 

 

 

 

 

 

 

HBM (Human Body Mode) ------------------------------------------------------------------------------------------

 

 

 

 

2kV

 

 

MM (Machine Mode) --------------------------------------------------------------------------------------------------

 

 

 

 

200V

 

 

Recommended Operating Conditions (Note 3)

 

 

 

 

 

 

 

z Supply Input Voltage --------------------------------------------------------------------------------------------------

 

 

 

 

2.5V to 5.5V

 

 

z Chip Enable Input Voltage -------------------------------------------------------------------------------------------

 

 

 

 

0V to 5.5V

 

 

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

 

 

 

 

40°C to 125°C

 

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

 

 

 

 

−40°C to 125°C

 

Electrical Characteristics

 

 

 

 

 

 

 

 

 

(VIN = VOUT + 1V, whichever is greater, CIN = 1μF, COUT = 1μF, TA = 25°C, unless otherwise specified)

 

 

 

 

 

Parameter

 

Symbol

Test Conditions

Min

 

Typ

Max

 

Units

 

Regulator 1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RT9002A

 

 

 

2.45

 

2.50

2.55

 

 

 

Output Voltage Accuracy

RT9002B

 

V OUT1

IOUT1 = 30mA

1.47

 

1.50

1.53

 

V

 

 

 

 

RT9002C

 

 

 

2.45

 

2.50

2.55

 

 

 

Maximum Output Current

 

I OUT1 _ MAX

 

240

 

--

--

 

mA

 

Load Regulation

(Note 5)

 

V LOAD1

1mA < IOUT1 < 100mA

--

 

1

--

 

mV

 

Dropout Voltage

(Note 6)

 

V DROP1 _ 1

IOUT1 = 30mA

--

 

50

--

 

mV

 

 

V DROP1 _ 2

IOUT1 = 100mA

--

 

150

--

 

 

 

 

 

 

 

 

 

 

 

Quiescent Current

(Note 7)

 

I Q1

VIN1 = VEN1 = 3.5V,

--

 

30

--

 

μA

 

 

IOUT1 = 0mA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Standby Current

 

 

 

I STB1

VIN1 = 3.5V, VEN1 = 0V

--

 

0.1

1

 

μA

 

Line Regulation

 

 

 

V LINE1

VIN1 = 3.5V to 5.5V,

--

 

0.01

0.2

 

%/V

 

 

 

 

VIN1 = VEN1, IOUT1 = 30mA

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Power Supply Rejection Rate

 

PSRR1

f = 100Hz, IOUT1 = 100mA

--

 

−60

--

 

dB

 

Current Limit

 

 

 

I LIM1

VIN1 = VEN1 = 5V

--

 

450

--

 

mA

 

EN Threshold

Logic-Low Voltage

 

V IL

 

--

 

--

0.6

 

V

 

Logic-High Voltage

 

V IH

 

1.8

 

--

--

 

 

 

 

 

 

 

 

 

Thermal Shutdown Protection

 

T SD1

 

--

 

170

--

 

°C

 

 

 

 

 

 

 

 

 

 

 

To be continued

 

 

 

 

 

 

 

 

 

 

 

 

 

DS9002ABC-03 March 2007

 

 

 

 

 

www.richtek.com

 

 

 

 

 

 

 

 

 

 

 

 

 

3

 

RT9002A/B/C

Parameter

Symbol

Test Conditions

Min

Typ

Max

Units

Thermal Shutdown Hysteresis

TSD1

 

--

40

--

°C

Enable Pin Current

 

 

IEN

VIN = 3.5V, Enable

--

0.1

1

μA

Regulator 2

 

 

 

 

 

 

 

 

 

 

RT9002A

 

 

3.234

3.30

3.366

 

Output Voltage Accuracy

RT9002B

VOUT2

IOUT2 = 30mA

2.744

2.80

2.856

V

 

 

RT9002C

 

 

3.234

3.30

3.366

 

Maximum Output Current

IOUT2_MAX

 

500

--

--

mA

Load Regulation

(Note 5)

VLOAD2

1mA < IOUT2 < 100mA

--

15

50

mV

Dropout Voltage

(Note 6)

VDROP2_1

IOUT2 = 30mA

--

50

90

mV

VDROP2_2

IOUT2 = 100mA

--

150

200

 

 

 

 

Quiescent Current

(Note 7)

IQ2

VIN2 = 4.3V, IOUT2 = 0mA

--

40

--

μA

Line Regulation

 

 

VLINE2

VIN2 = 4.3V to 5.5V,

--

0.01

0.2

%/V

 

 

IOUT2 = 30mA

 

 

 

 

 

 

 

 

Power Supply Rejection Rate

PSRR2

f = 100Hz, IOUT2 = 100mA

--

−60

--

dB

Current Limit

 

 

ILIM2

VIN2 = 5V

--

800

--

mA

Thermal Shutdown Protection

TSD2

 

--

170

--

°C

Thermal Shutdown Hysteresis

TSD2

 

--

40

--

°C

Detector

 

 

 

 

 

 

 

 

 

 

RT9002A

 

 

3.528

3.60

3.672

 

Detect Fall Voltage

 

RT9002B

VDF

 

3.822

3.9

3.978

V

 

 

RT9002C

 

 

3.528

3.60

3.672

 

Hysteresis

 

 

VHYS

 

VDF

VDF

VDF

V

 

 

 

x0.02

x0.05

x0.08

 

 

 

 

 

 

 

 

RT9002A

 

VDOUT = 0.5V, VIN2 = 5.0V

7.0

12.0

--

 

Sink Current

 

RT9002B

IDOUT

VDOUT = 0.5V, VIN2 = 2.0V

4.0

8.0

--

mA

 

 

 

 

 

 

 

 

 

 

RT9002C

 

4.0

8.0

--

 

 

 

 

 

 

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DS9002ABC-03 March 2007

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