RT9047GG5 - Richtek - Product.Network

RT9047

DS9047-03 November 2011 www.richtek.com

Ordering Information

Note :

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.

Marking Information

Applications

zTelecom/Networking Cards

zMotherboards/Peripheral Cards

zWireless Infra structure

zNotebook Computers

zBattery Powered Systems

zSet Top Boxes

Pin Configurations

(TOP VIEW)

General Description

The RT9047 is a 1A linear low dropout (LDO) voltage

regulator which uses a n N-MOSFET pass element in a

voltage follower. The topology is relatively in sen sitive to

output ca pacitor value and ESR, allowing a wide variety of

load configurations. The N-MOSFET topology also allows

very low dropout. Current consumption, when not enabled,

is under 1μA and ideal for portable a pplications.

This device is protected by thermal shutdown and foldback

current limit. The RT9047 is available an SOT-223-5

package.

Features

zStable with Ceramic Capacitor

zInput Voltage Range : 2.2V to 5.5V

zUltra Low Dropout Voltage : 130mV (typ.) at 1A

zLow Reverse Leakage Current

zLow Quiescent (<1μμ

μμ

μA) in Shutdown Mode

zThermal Shutdown and Current Limit

zAvailable in Multiple Output Voltage Versions

zCustom Outputs Available Using Factory

zRoHS Compliant and Halogen Free

SOT-223-5

1A, Low Voltage, Low Dropout LDO

RT9047GG5 : Product Number

YMDNN : Date Code

GND(TAB)

VOUT

VIN

12345

RT9047 Package Type

G5 : SOT-223-5

Lead Plating System

G : Green (Halogen Free and Pb Free)

RT9047

GG5YMDNN

RT9047

2DS9047-03 November 2011www.richtek.com

Functional Pin Description

Function Block Diagram

Typical Application Circuit

Charge Pump

4MHz

Oscilator Current

Limit VIN

GND

FBEN

Thermal

Shutdown

Bandgap +

ERROR

AMP

VOUT

Pin No. Pin Name Pin Function

1 VIN Supply Voltage Input.

2 VOUT Output Voltage.

3 GND Ground.

4 FB Output Feedback Pin. Connect the external r esistor divider.

5 EN Chip Enable (Active-High).

OUT FB R1

V = V (1 + ) Volts

VOUT

RT9047

GND

VIN

Chip Enable

VOUT

CIN

4.7µF COUT

4.7µF

Note : Where VFB is the reference voltage with a typical value of 1.2V.

RT9047

DS9047-03 November 2011 www.richtek.com

Absolute Maximum Ratings (Note 1)

zInput Voltage, VIN ---------------------------------------------------------------------------------------------------------- 6V

zOutput Voltage, VOUT ----------------------------------------------------------------------------------------------------- 5.5V

z Power Dissipation, PD @ TA = 25°C

SOT-223-5------------------------------------------------------------------------------------------------------------------ 1.282W

zPa ckage Thermal Resista nce (Note 2)

SOT-223-5, θJA ------------------------------------------------------------------------------------------------------------- 78°C/W

SOT-223-5, θJC ------------------------------------------------------------------------------------------------------------- 15°C/W

zLead T emperature (Soldering, 10 sec.)------------------------------------------------------------------------------- 260°C

zJunction T emperature----------------------------------------------------------------------------------------------------- 150°C

zStorage T emperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C

zESD Susceptibility (Note 3)

HBM (Human Body Mode) ---------------------------------------------------------------------------------------------- 2kV

MM (Ma chine Mode) ------------------------------------------------------------------------------------------------------ 200V

Recommended Operating Conditions (Note 4)

zInput Voltage, VIN ---------------------------------------------------------------------------------------------------------- 2.2V to 5.5V

zJunction T emperature Range-------------------------------------------------------------------------------------------- −40°C to 125°C

zAmbient T emperature Range-------------------------------------------------------------------------------------------- −40°C to 85°C

Electrical Characteristics

(VIN = VOUT(NOM) + 1V, IOUT = 1mA, VEN = 2.2V, and COUT = 4.7μF ,TA = 25°C, unless otherwise specified)

Parameter Symbol Test Conditions Min Typ Max Unit

O ut put Vol tag e V OUT VIN = 3 . 3V , VFB = VOUT,

IOUT = 10mA, Over T emperature −3 -- 3 %

Load Regulation (Note 5) ΔVLOAD VIN = 3.3V , V FB = VOUT,

IOUT = 10mA to 1 A -- 0.5 1 %/A

Li ne Regulati on ΔVLINE VIN = 2.2V to 5.5V, VFB = V OUT,

IOUT = 10mA -- 0.1 0.2 %/V

Dropout Voltage (Note 6) VDROP I

OUT = 1A -- 130 200 m V

O ut put Curr ent L imit I LIM V

IN = 3.3V 1. 05 1.6 2.2 A

Sh or t Ci r c u it Cu rrent ISC V

IN = 3 .3V, VOUT = 0 - - 500 -- mA

FB Pi n Curr ent I FB V

IN = 3.3V -- -- 1 μA

f = 100H z, IOUT = 1A -- 55 --

Po wer Sup ply Re jec tion Rate PSRR f = 10 k Hz, IOUT = 1A -- 35 -- dB

O ut put Noi se Voltage

BW = 10Hz − 100kHz VON C

OUT = 1 0 μF --

27 x

VOUT -- μVRMS

Star tup T i me tSTR V

OUT = 3V , RL = 30Ω -- 500 -- μs

Logic-High VIH V

IN = 3.3V 1. 7 -- --

EN Threshold

Voltage Logic-Low VIL V

IN = 3.3V - - -- 0.5 V

EN Pin Current IEN_H V

IN = VEN = 5.5V -- -- 1 μA

To be continued

RT9047

4DS9047-03 November 2011www.richtek.com

Note 1. Stresses listed as the above “Absolute Maximum Ratings” may cause permanent damage to the device. These are for

stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the

operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended

periods may remain possibility to affect device reliability.

Note 2. θJA is measured in natural convection at TA = 25°C on a high effective thermal conductivity four-layer test board of

JEDEC 51-7 thermal measurement standard. The measurement case position of θJC is on the exposed pad of the

package.

Note 3. Devices are ESD sensitive. Handling precaution is recommended.

Note 4. The device is not guaranteed to function outside its operating conditions.

Note 5. Regulation is measured at constant junction temperature by using 2ms current pulse. Devices are tested for load

regulation in the load range from 10mA to 1A.

Note 6. The dropout voltage is defined as VIN − VOUT, which is measured when VOUT is VOUT (NORMAL) − 100mV.

Parameter Symbol Test Conditions Min Typ Max Unit

Feedback Volt age VFB V

IN = 3 .3V, VFB = VOUT, IOUT = 1mA 1. 190 1. 200 1.2 16 V

Out put Impedance in

Dropout ZO_DROP 2.2V < VIN < VOUT + VDO -- 0.25 -- Ω

Rever se Leakage Current I Leakage V

EN = 0V, 0 ≦ VIN ≦ V

OUT -- -- 1 μA

Therma l Sh utd own

Temperature TSD 140 -- 160 °C

VIN = 3.3V, IOUT = 1mA -- 600 --

Qui esc ent Current IGND VIN = 3 .3V, IOUT = 1A -- 800 -- μA

Shu tdow n Cu rrent ISHDN V

EN = 0V - - -- 1 μA

RT9047

DS9047-03 November 2011 www.richtek.com

Output Voltage vs. Temperature

1.16

1.17

1.18

1.19

1.20

1.21

1.22

1.23

1.24

-50 -25 0 25 50 75 100 125

Tempera tu re (° C)

Output Voltage (V)

Typical Operating Characteristics

VIN = 2.5V, VOUT = 1.2V, IOUT = 0mA

Quiescent Current vs. Temperature

350

400

450

500

550

600

650

700

-50 -25 0 25 50 75 100 125

Tempera tu re ( °C )

Quiescent Curr ent (µA

)

VIN = 2.5V, VOUT = 1.2V, IOUT = 0mA

Current Limit vs. Temperature

1.3

1.6

1.9

2.2

2.5

2.8

3.1

-50 -25 0 25 50 75 100 125

Temperature (°C)

Current Lim it (A)

VIN = 4.2V, VOUT = 3.3V

EN Threshold Voltage vs. Temperature

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

1.5

-50 -25 0 25 50 75 100 125

Tempera tu re ( °C )

EN Threshold Voltage (V

)

VEN = 3.3V, VOUT = 2.5V

Rising

Falling

UVLO vs. Tem perature

1.1

1.3

1.5

1.7

1.9

2.1

2.3

-50 -25 0 25 50 75 100 125

Temperature (°C)

UVLO ( V)

Rising

VEN = 5V

Falling

Dropout Voltage vs . Loa d Current

100

150

200

250

300

0.0 0.2 0.4 0.6 0.8 1.0

Load Curr ent (A)

Dropout Voltage (mV)

125°C

25°C

−40°C

VOUT = 2.5V

RT9047

6DS9047-03 November 2011www.richtek.com

Load Transient Response

Time (100μs/Div)

VIN = 3.3V, VOUT = 2.5V, IOUT = 10mA to 1A

IOUT

(500mA/Div)

VOUT

(10mV/Div)

Power On from EN

Time (100μs/Div)

VIN = 3.3V, VOUT = 1.2V, IOUT = 1A

VEN

(5V/Div)

IIN

(1A/Div)

VOUT

(1V/Div)

Line Transient Response

Time (500μs/Div)

VOUT

(10mV/Div)

VIN

(2V/Div)

VIN = 4.2V to 5.2V, VOUT = 3.3V, IOUT = 1A

Power Off from EN

Time (5μs/Div)

VEN

(5V/Div)

IIN

(1A/Div)

VOUT

(1V/Div)

VIN = 3.3V, VOUT = 1.2V, IOUT = 1A

PSRR

-80

-60

-40

-20

10 100 1000 10000 100000 1000000

Frequen cy ( kHz )

PSRR ( dB)

VIN = 4.1V to 4.2V, VOUT = 3V

IOUT = 1mA

IOUT = 100mA

IOUT = 300mA

0.01 0.1 1 10 100 1000

RT9047

DS9047-03 November 2011 www.richtek.com

Application Information

The RT9047 is a low voltage, low dropout linear regulator

with an external bias supply input capable of supporting

an input voltage range from 2.2V to 5.5V with a fixed output

voltage from 1V to 2V in 0.1V increments.

Output Voltage Setting

The RT9047 output voltage is adjustable from 1.2V to 5.2V

via the external resistive voltage divider. The voltage divider

resistors ca n have values of up to 800kΩ because of the

very high impedance and low bias current of the sense

comparator. The output voltage is set according to the

following equation :

OUT FB R1

V = V 1+

⎛⎞

×⎜⎟

⎝⎠

where VFB is the reference voltage with a typical value of

1.2V.

Chip Enable Operation

The RT9047 goes into sleep mode when the EN pin is in

a logic low condition. In this condition, the pa ss transistor,

error amplifier, and band gap are all turned off, reducing

the supply current to only 1μA (max.). The EN pin ca n be

directly tied to VIN to keep the part on.

Current Limit

The RT9047contains an independent current limit circuitry ,

which monitors and controls the pass transistor's gate

voltage, limiting the output current to 1.6A (typ.).

CIN and COUT Selection

Like any low dropout regulator , the external ca pacitors of

the RT9047 must be carefully selected for regulator stability

and performance. Using a capacitor of at least 4.7μF is

suitable. The input ca pacitor must be located at a dista nce

of not more than 0.5 inch from the input pin of the IC. Any

good quality ceramic capa citor ca n be used. However, a

capacitor with larger value and lower ESR (Equivalent

Series Resista nce) is recommended since it will provide

better PSRR a nd line tra nsient response.

The RT9047 is designed specifically to work with low ESR

ceramic output capacitor for space saving and performance

consideration. Using a cera mic capacitor with capacitance

of at lea st 4.7μF and ESR larger than 1mΩ on the RT9047

output ensures stability. Nevertheless, the RT9047 can

still work well with other types of output ca pa citors due to

its wide range of stable ESR. Figure 1 shows the allowable

ESR range as a function of load current for various output

capacitance. Output ca pacitors with larger capacitance can

reduce noise and improve load transient response,

stability , and PSRR. The output capacitor should be located

at a distance of not more than 0.5 inch from the output pin

of the RT9047.

Figure 1

Thermal Considerations

For continuous operation, do not exceed absolute

maximum junction temperature. The maximum power

dissipation depends on the thermal resistance of the IC

package, PCB layout, rate of surrounding airflow, and

difference between junction and ambient temperature. The

maximum power dissipation can be calculated by the

following formula :

PD(MAX) = (TJ(MAX) − TA) / θJA

where TJ(MAX) is the maximum junction temperature, TA is

the a mbient temperature, and θJA is the junction to ambient

thermal resistance.

For recommended operating condition specifications of

the RT9047, the maximum junction temperature is 125°C

and TA is the a mbient temperature. The junction to a mbient

thermal resistance, θJA, is layout dependent. For SOT-

223-5 packages, the thermal resistance, θJA, is 78°C/W

Region of Stable COUT ESR vs. Loa d Current

0.001

0.01

0.1

100

0.0 0.3 0.5 0.8 1.0

Load Current (A)

COUT ESR ( )

VIN = 2.5V, VOUT = 1.2V, COUT = 4.7μF / X7R

Unstable Range

Stable Range

RT9047

8DS9047-03 November 2011www.richtek.com

on a standard JEDEC 51-7 four-layer thermal test board.

The maximum power dissipation at TA = 25°C can be

calculated by the following formula :

PD(MAX) = (125°C − 25°C) / (78°C/W) = 1.282W for

SOT-223-5 package

The maximum power dissipation depends on the operating

ambient temperature for fixed TJ(MAX) and thermal

resistance, θJA. For the RT9047 package, the derating

curve in Figure 2 allows the designer to see the effect of

rising ambient temperature on the maximum power

dissipation.

Figure 2. Derating Curves for the RT9047 Package

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

1.4

0 25 50 75 100 125

Ambient Tem pera tu re (°C)

Maximum Power Di ssipat ion (W ) 1

Four-Layer PCB

RT9047

www.richtek.com

Information that is provided by Richtek Technology Corporation is believed to be accurate and reliable. Richtek reserves the right to make any change in circuit

design, specification or other related things if necessary without notice at any time. No third party intellectual property infringement of the applications should be

guaranteed by users when integrating Richtek products into any application. No legal responsibility for any said applications is assumed by Richtek.

DS9047-03 November 2011

Richtek Technology Corporation

Headquarter

5F, No. 20, Taiyuen Street, Chupei City

Hsinchu, Taiwan, R.O.C.

Tel: (8863)5526789 Fax: (8863)5526611

Richtek Technology Corporation

Taipei Office (Marketing)

5F, No. 95, Minchiuan Road, Hsintien City

Taipei County, Taiwan, R.O.C.

Tel: (8862)86672399 Fax: (8862)86672377

Email: marketing@richtek.com

Outline Dimension

5-Lead SOT-223 Surface Mount Package

Dim e nsio n s In M illim eters Di me ns ions In Inche s

Symbol Min Max Min Max

A 1.400 1.800 0.055 0.071

A1 0.020 0.100

0.001 0.004

b 0.410 0.530 0.016 0.021

B 3.300 3.700 0.130 0.146

C 6.700 7.300 0.264 0.287

D 6.300 6.700 0.248 0.264

b1 2.900 3.100 0.114 0.122

e 1.270 0.050

H 0.230 0.350 0.009 0.014

L 1.500 2.000 0.059 0.079

L1 0.800 1.100 0.031 0.043