RichTek RT9002A, RT9002B, RT9002C Technical data

查询RT9002A供应商

Dual Low-Dropout Regulator with Detector

RT9002A/B/C

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

Note :

RichTek Pb-free and Green 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.

`100% matte tin (Sn) plating.

-

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

Features

zz

Low Quiescent Current (Typically 70

z

zz

zz

z Wide Operating Voltage Ranges : 2.5V to 5.5V

zz

zz

z Ultra-Fast T ran sient Response

zz

zz

z Tight Load and Line Regulation

zz

zz

z Current Limiting Protection

zz

zz

z Thermal Shutdown Protection

zz

zz

z Only low-ESR Ceramic Capacitors Required for

zz

Stability

zz

z Custom LDO V

zz

OUT1

, V

Voltage Available from

OUT2

1.5V to 3.3V

zz

z Custom V

zz

zz

z RoHS Compliant and 100% Lead (Pb)-Free

zz

Detector Available from 3.5V to 4.0V

IN

μμ

μA)

μμ

Applications

z CD/DVD-ROM, CD/RW

z Wireless LAN Card/Keyboard/Mouse

z Battery-Powered Equipment

z XDSL Router

Pin Configurations

(TOP VIEW)

SOP-8

8

EN1

7

GND

6

VDOUT

5

VOUT2

VIN1

VOUT1

Cd

VIN2

2

3

4

Typical Application Circuit

Cd

2

3

6

Cd

C

1uF1uF

100k

C

1uF

OUT1

R1

OUT2

V

V

V

V

OUT1

IN2

DOUT

OUT2

V

IN1

C

IN1

Chip Enable

V

IN2

C

IN2

1uF

1

VIN1

RT9002A/B/C

8

EN1

45

VIN2 VOUT2

VOUT1

VDOUT

GND

7

DS9002ABC-03 March 2007 www.richtek.com

1

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

Cd

VDOUT

Shutdown

and

Logic Control

V

REF

+

-

Error

Amplifier

+

-

Amplifier

-

+

Comparator

Error

V

REF

VD

MOS Driver

Current-Limit

and

Thermal

Protection

MOS Driver

Current-Limit

and

Thermal

Protection

VIN1

VOUT1

VIN2

VOUT2

GND

DS9002ABC-03 March 2007www.richtek.com

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, P

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

@ T

D

= 25°C

A

Electrical Characteristics

(V

= V

IN

+ 1V, whichever is greater, CIN = 1μF, C

OUT

Parameter Symbol Test Conditions Min Typ Max Units

Regulator 1

RT9002A 2.45 2.50 2.55

Output Voltage Accuracy

RT9002B 1.47 1.50 1.53

ΔV

OUT1

RT9002C

Maximum Output Current I

Load Regulation (Note 5) ΔV

Dropout Voltage (Note 6)

OUT1_MAX

LOAD1

V

DROP1_1

V

DROP1_2

Quiescent Current (Note 7) IQ1

Standby Current I

Line Regulation ΔV

STB1

LINE1

Power Supply Rejection Rate PSRR1 f = 100Hz, I

Current Limit I

LIM1

Logic-Low Voltage VIL -- -- 0.6

EN Threshold

Logic-High Voltage V

Thermal Shutdown Protection T

IH

SD1

= 1μF, TA = 25°C, unless otherwise specified)

OUT

I

OUT1

= 30mA

240 -- -- mA

1mA < I

I

OUT1

I

OUT1

V

I

OUT1

V

V

V

V

OUT1

= 30mA -- 50 --

= 100mA -- 150 --

= V

IN1

= 0mA

= 3.5V, V

IN1

= 3.5V to 5.5V,

IN1

= V

IN1

= V

IN1

1.8 -- --

-- 170 -- °C

2.45 2.50 2.55

< 100mA -- 1 -- mV

= 3.5V,

EN1

= 0V -- 0.1 1 μA

EN1

, I

EN1

OUT1

EN1

= 30mA

OUT1

= 100mA -- −60 -- dB

= 5V -- 450 -- mA

-- 30 -- μA

-- 0.01 0.2 %/V

To be continued

V

mV

V

DS9002ABC-03 March 2007 www.richtek.com

3

RT9002A/B/C

Parameter Symbol Test Conditions Min Typ Max Units

Thermal Shutdown Hysteresis

ΔT

SD1

Enable Pin Current IEN V

-- 40 --

= 3.5V, Enable -- 0.1 1 μA

IN

Regulator 2

RT9002A 3.234 3.30 3.366

Output Voltage Accuracy

RT9002B 2.744 2.80 2.856

ΔV

OUT2

I

OUT2

= 30mA

RT9002C

Maximum Output Current I

Load Regulation (Note 5) ΔV

Dropout Voltage (Note 6)

OUT2_MAX

LOAD2

V

DROP2_1

V

DROP2_2

Quiescent Current (Note 7) IQ2 V

Line Regulation ΔV

LINE2

500 -- -- mA

1mA < I

I

OUT2

I

OUT2

V

I

OUT2

OUT2

= 30mA -- 50 90

= 100mA -- 150 200

= 4.3V, I

IN2

= 4.3V to 5.5V,

IN2

= 30mA

Power Supply Rejection Rate PSRR2 f = 100Hz, I

Current Limit I

Thermal Shutdown Protection T

Thermal Shutdown Hysteresis

V

LIM2

-- 170 -- °C

SD2

ΔT

SD2

= 5V -- 800 -- mA

IN2

-- 40 --

Detector

°C

3.234 3.30 3.366

< 100mA -- 15 50 mV

mV

= 0mA -- 40 -- μA

OUT2

-- 0.01 0.2 %/V

= 100mA -- −60 -- dB

OUT2

V

°C

RT9002A 3.528 3.60 3.672

Detect Fall Voltage

RT9002B 3.822 3.9 3.978

VDF

RT9002C

Hysteresis ΔV

RT9002A V

Sink Current

RT9002B 4.0 8.0 --

I

DOUT

RT9002C

HYS

DOUT

V

DOUT

= 0.5V, V

= 0.5V, V

3.528 3.60 3.672

V

DF

x0.02

= 5.0V 7.0 12.0 --

IN2

= 2.0V

IN2

V

DF

x0.05

4.0 8.0 --

V

DF

x0.08

V

V

mA

DS9002ABC-03 March 2007www.richtek.com

4