Richtek RT9012-FMPQV, RT9012-FMPQW, RT9012-FSPQW, RT9012-GMPQV, RT9012-GMPQW Schematic [ru]

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RT9012

300mA Dual LDO Regulator with POR

General Description

RT9012 is a dual channel, low noise, and low dropout with the sourcing ability up to 300mA and power-on reset function. The range of output voltage is from 1.2V to 3.6V by operating from 2.5V to 5.5V input.

The RT9012 offers 2% accuracy, extremely low dropout voltage (240mV @ 300mA), and extremely low ground current, only 27uA per LDO. The shutdown current is near zero current which is suitable for battery-power devices. Other features include current limiting, over temperature, output short circuit protection.

The RT9012 is short circuit thermal folded back protected. The IC lowers its OTP trip point from 165°C to 110°C when output short circuit occurs (VOUT < 0.4V) providing maximum safety to end users.

The RT9012 can operate stably with very small ceramic output capacitors, reducing required board space and component cost. The RT9012 is available in fixed output voltages in the WDFN-8L 2x2 package.

Ordering Information

RT9012-

Package Type

QW : WDFN-8L 2x2 (W-Type)

Lead Plating System P : Pb Free

G : Green (Halogen Free and Pb Free)

Output Voltage : VOUT1/VOUT2 VOUT2 > VOUT1 is Recommended

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.

Marking Information

For marking information, contact our sales representative directly or through a Richtek distributor located in your area.

Features

zWide Operating Voltage Ranges : 2.5V to 5.5V

zLow-Noise for RF Application

zNo Noise Bypass Capacitor Required

zFast Response in Line/Load Transient

zTTL-Logic-Controlled Shutdown Input

zLow Temperature Coefficient

zDual LDO Outputs (300mA/300mA)

zUltra-low Quiescent Current 27uA/LDO

zHigh Output Accuracy 2%

zShort Circuit Protection

zThermal Shutdown Protection

zCurrent Limit Protection

zShort Circuit Thermal Folded Back Protection

zTiny 8-Lead WDFN Package

zRoHS Compliant and 100% Lead (Pb)-Free

Applications

zCDMA/GSM Cellular Handsets

zBattery-Powered Equipment

zLaptop, Palmtops, Notebook Computers

zHand-Held Instruments

zPCMCIA Cards

zPortable Information Appliances

Pin Configurations

(TOP VIEW)

 

 

VIN

1

 

8

VOUT1

 

 

 

 

EN1

2

 

7

VOUT2

 

 

 

 

EN2

3

9

6

POR

 

 

 

 

SET

4

5

GND

 

 

 

 

 

 

 

 

 

WDFN-8L 2x2

 

 

Available Voltage Version

 

Code

Voltage

Code

 

Voltage

Code

Voltage

A

3.5

 

B

 

1.3

C

1.2

D

1.85

 

E

 

2.1

F

1.5

G

1.8

 

H

 

 

2

J

2.5

K

2.6

 

L

 

2.7

M

2.8

N

2.85

 

P

 

 

3

Q

3.1

R

3.2

 

S

 

3.3

T

2.65

V

2.9

W

 

1.6

X

3.15

Y

1.9

 

 

 

 

 

 

 

DS9012-09 April 2011

www.richtek.com

1

RT9012

Typical Application Circuit

 

 

100K

 

VIN

VIN

POR

 

 

CIN

RT9012

 

 

1uF

 

 

 

 

 

EN1

VOUT1

VOUT1

 

Chip Enable

 

COUT1

 

EN2

 

1uF

 

VOUT2

VOUT2

 

SET

 

GND

COUT2

 

 

1uF

 

 

 

 

 

 

 

 

 

CDELAY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Functional Pin Description

Pin No.

Pin Name

 

 

 

 

 

 

 

 

 

 

 

 

 

Pin Function

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1

VIN

Supply Input.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2

EN1

Chip Enable1 (Active High).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

EN2

Chip Enable2 (Active High).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

SET

Delay Set Input. Connect external capacitor to GND to set the internal delay.

5

GND

Common Ground.

6

POR

Power-On Reset Output : Open-drain output. Active low indicates an output

under-voltage condition on regulator 2.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

7

VOUT2

Channel 2 Output Voltage.

8

VOUT1

Channel 1 Output Voltage.

9 (Exposed Pad)

GND

The exposed pad must be soldered to a large PCB and connected to GND

for maximum power dissipation.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

www.richtek.com

DS9012-09 April 2011

2

Richtek RT9012-FMPQV, RT9012-FMPQW, RT9012-FSPQW, RT9012-GMPQV, RT9012-GMPQW Schematic

RT9012

Function Block Diagram

EN1

0.2uA

Shutdown

VIN

 

 

 

and

 

 

 

Logic Control

 

 

VREF

 

 

 

-

MOS Driver

 

 

+

 

 

Error

VOUT1

 

Amplifier

 

 

Current-Limit

 

 

 

and

 

 

 

Thermal

 

 

 

Protection

 

 

 

 

GND

EN2

0.2uA

Shutdown

 

 

 

 

 

and

 

 

 

Logic Control

 

 

VREF

 

 

 

-

MOS Driver

 

 

+

 

 

Error

VOUT2

 

Amplifier

 

 

Current-Limit

 

 

 

and

 

 

 

Thermal

 

 

 

Protection

 

 

 

 

GND

SET

 

POR& Delay

POR

 

 

 

DS9012-09 April 2011

www.richtek.com

3

RT9012

Absolute Maximum Ratings (Note 1)

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

6V

z Other I/O Pin Voltages ---------------------------------------------------------------------------------------------------

6V

z Power Dissipation, PD @ TA = 25°C

 

WDFN-8L 2x2 --------------------------------------------------------------------------------------------------------------

0.606W

z Package Thermal Resistance (Note 2)

 

WDFN-8L 2x2, θJA ---------------------------------------------------------------------------------------------------------

165°C/W

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

150°C

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

260°C

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

−65°C to 150°C

z ESD Susceptibility (Note 3)

 

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

2kV

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

200V

Recommended Operating Conditions

(Note 4)

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

2.5V to 5.5V

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

0V to 5.5V

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

40°C to 125°C

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

40°C to 85°C

Electrical Characteristics

(VIN = VOUT + 1V, VEN = VIN, CIN = COUT = 1μF, TA = 25°C, unless otherwise specified.)

Parameter

Symbol

Test Conditions

Min

Typ

Max

Unit

 

 

 

 

 

 

 

 

 

Input Voltage

VIN

VIN = 2.5V to 5.5V

2.5

--

5.5

V

 

Dropout Voltage (Note 5)

VDROP

IOUT = 150mA

--

120

--

mV

 

IOUT = 300mA

--

240

--

mV

 

 

 

 

 

 

 

 

 

 

 

 

Output voltage range

VOUT

 

1.2

--

3.6

V

 

VOUT Accuracy

V

IOUT = 1mA

-2

--

+2

%

 

Line Regulation

VLINE

VIN = (VOUT + 0.3V) to 5.5V or

--

--

0.2

%/V

 

VIN > 2.5V, whichever is larger

 

 

 

 

 

 

 

 

Load Regulation

VLOAD

1mA < IOUT< 300mA

--

--

0.6

%

 

 

 

 

 

 

 

 

 

Current Limit

 

RLOAD = 1Ω

330

450

700

mA

 

 

 

 

 

 

 

 

 

Quiescent Current

IQ

VEN > 1.5V

--

58

80

μA

 

 

 

 

 

 

 

 

 

Shutdown Current

IQ_SD

VEN < 0.4V

--

--

1

μA

 

EN Threshold

VIH

VIN = 2.5V to 5.5V, Power On

1.5

--

--

V

 

VIL

VIN = 2.5V to 5.5V, Shutdown

--

--

0.4

 

 

 

 

Output Voltage TC

 

 

--

100

--

ppm/°C

 

 

 

 

 

 

 

 

 

Thermal Shutdown

TSD

 

--

170

--

°C

 

 

 

 

 

 

 

 

 

Thermal Shutdown Hysteresis

TSD

 

--

40

--

°

 

 

 

 

 

 

C

 

 

 

 

 

 

To be continued

 

 

 

 

 

 

 

 

www.richtek.com

 

 

 

DS9012-09

April 2011

4

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