RichTek RT9161 User Manual

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300/500mA Low Dropout Linear Voltage Regulator

RT9161/A

General Description

The RT9161/A is a 300/500mA fixed output voltage low

dropout linear regulator. Typical ground current is

approximately 110μA, from zero to maximum loading

conditions. Wide range of available output voltage fits most

of applications. Built-in output current-limiting most

thermal-limiting provide maximal protection against any

fault conditions.

For ease of application, the RT9161/A comes in the popular

3-pin SOT-23 (300mA), SOT-89 (300mA), SOT-223

(500mA), or TO-92 packages.

Ordering Information

RT9161/A-

Package Type
V : SOT-23-3
X : SOT-89
G : SOT-223
ZL : TO-92 (L-Type)
ZT : TO-92 (T-Type)

Operating Temperature Range
C : Commercial Standard
P : Pb Free with Commercial Standard

Output Voltage
15 : 1.5V
16 : 1.6V
:
49 : 4.9V
50 : 5.0V

500mA Output Current
300mA Output Current

Features

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Low Dropout Voltage of 200mV at Output Current

z

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100mA, 450mV at Output Current 300mA, and
750mV at 500mA Output Current

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z Guaranteed 300/500mA Output Current

zz

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z Internal 1.5

zz

zz

z Low Ground Current 1 10

zz

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z 2% Accura cy Output Voltage

zz

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z Input Voltage Range up to 12V

zz

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z Extremely Tight Load Regulation

zz

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z Fast T ran sient Respon se

zz

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z Current-limiting and Thermal-limiting

zz

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

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ΩΩ

Ω P-MOSFET Draws No Base Current

ΩΩ

μμ

μA

μμ

Applications

z Voltage Regulator for LAN Card, CD-ROM, and DVD

z Wireless Communication Systems

z Battery Powered Systems

Marking Information

For marking information, contact our sales representative

directly or through a RichTek distributor located in your

area, otherwise visit our website for detail.

Pin Configurations

(TOP VIEW)

VIN

3

1

2

123

Note :

RichTek Pb-free products are :

−RoHS compliant and compatible with the current require-

GND VOUT

SOT-23-3

GND

VIN

(TAB)

SOT-89

VOUT

ments of IPC/JEDEC J-STD-020.

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

−100%matte tin (Sn) plating.

GND

2

1

VIN

(TAB)

3

VOUT

SOT-223

DS9161/A-29 June 2005 www.richtek.com

1

RT9161/A

3

2

1VIN

TO-92

RT9161/A-

CZL

Typical Application Circuit

V

IN

Functional Pin Description

Pin Name Pin Function

C
1uF

VOUT

GND

3

2

1

VOUT

VIN

GND

TO-92

RT9161/A-

+

IN

RT9161/A

VIN

GND

VOUT

+

C

OUT

10uF

Electrolytic

V

OUT

CZT

VOUT Output Voltage

GND Ground

VIN Power Input

Function Block Diagram

VIN

Current

Limiting

Sensor

Thermal

Shutdown

Error Amp

1.2V

Reference

VOUT

+

-

GND

DS9161/A-29 June 2005www.richtek.com

2

RT9161/A

Absolute Maximum Ratings

z Input Voltage ----------------------------------------------------------------------------------------------------------- −0.3 to 14V
z Operating Junction Temperature Range ------------------------------------------------------------------------- −40°C to 125°C
z Storage Temperature Range --------------------------------------------------------------------------------------- −65°C to 150°C

z Power Dissipation, P

SOT-23-3 --------------------------------------------------------------------------------------------------------------- 0.4W

SOT-89 ------------------------------------------------------------------------------------------------------------------ 0.571W

SOT-223 ---------------------------------------------------------------------------------------------------------------- 0.741W

TO-92 -------------------------------------------------------------------------------------------------------------------- 0.625W

z Package Thermal Resistance (Note 4)

SOT-23-3, θJA---------------------------------------------------------------------------------------------------------- 250°C/W

SOT-23-3, θJC--------------------------------------------------------------------------------------------------------- 140°C/W

SOT-89, θJA------------------------------------------------------------------------------------------------------------ 175°C/W

SOT-89, θJC------------------------------------------------------------------------------------------------------------ 100°C/W

SOT-223, θJA----------------------------------------------------------------------------------------------------------- 135°C/W

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

TO-92, θJA-------------------------------------------------------------------------------------------------------------- 160°C/W

TO-92, θJC-------------------------------------------------------------------------------------------------------------- 125°C/W

D

@ T

= 25°C

A

Electrical Characteristics

(TA = 25°C, CIN = 1μF, C

Parameter Symbol Test Conditions Min Typ Max Units

Output Voltage Accuracy

Output Voltage Temperature
Coefficient

Line Regulation

Load Regulation (Note1)

Current Limit
(Note 2)

Dropout Voltage (Note 3)

Standby Current

Note 1. Regulation is measured at constant junction temperature, using pulsed ON time.
Note 2. Current Limit is measured at constant junction temperature, using pulsed ON time.
Note 3. The dropout voltage is defined as V

Note 4. θ

is measured in the natural convection at TA = 25°C on a low effective single layer thermal conductivity test board of

JA

JEDEC 51-3 thermal measurement standard.

= 10μF, unless otherwise specified.)

OUT

ΔV

I

OUT

= 1mA, V

L

ΔV

ΔV

IL = 1mA, VIN= 4.5 ~ 12V

LINE

IL = 1mA ~ 300/500mA, VIN = 5V

LOAD

RT9161

I

V

RT9161A

LIM

V

DROP

I

STANDBY IL

IN

IL = 300/500mA

= 0, VIN = 12V

-V

IN

OUT

= 5V

IN

= 5V, V

, which is measured when V

OUT

= 0V

-2 -- +2 %

-- 50 150

-- 2 3 %V

-- 1 30/50 mV

350 580 --

500 900 --

-- 450/750 600/1000 mV

-- 110 180

is V

OUT

OUT(NORMAL)

− 100mV.

PPM/°C

OUT

mA

μA

DS9161/A-29 June 2005 www.richtek.com

3

RT9161/A

>

>

)

(

)

A

T

T

>

>

)

(

)

A

Typical Operating Characteristics

Tempera ture Stability

3.4

V

(°C)

OUT

V

OUT

OUT

125°C

)

3.2

3

2.8

Output Voltage (V)

2.6

2.4

-50 -25 0 25 50 75 100 125

Temperature

Dropout Voltage (VIN-V

1

0.8

0.6

= 3.3V

= 2.5V

25°C

0.14

0.12

0.10

0.08

0.06

0.04

Quiescient Current (mA)

0.02

0.00

-30 0 30 60 90 120

Temperature

(°C)

Short Circuit Current

1.4

Quiescient Current vs. Temperature

1.2

1

0.8

125°C

25°C

VIN = 5V

0.4

Dropout Voltage (V)

0.2

V

= 3.3V

V

OUT

T

= 25°C

OUT

= 3.3V

0

0 100 200 300 400 500

I

(mA)

Load

7

V

6

5

Input Voltage

Deviation

4

100

2

0

1

-100

Deviation (mV)

Output Voltage

-200

Line Transient Response

C

= 10μF Electrolytic

OUT

I

= 0.1A

OUT

T

≈

T

Time (100μS/Div

Time (100μs/Div)

0.6

0.4

Short Circuit Current (A)

0.2

0

0246810

Input/Output Differential (V)

7

V

6

5

Input Voltage

Deviation

4

Line Transient Response

C

= 10μF Electrolytic

OUT

I

= 0.1A

OUT

V

OUT

= 25°C

T

= 2.5V

≈

100

2

0

1

-100

Deviation (mV)

Output Voltage

-200

Time (100μS/Div

Time (100μs/Div)

DS9161/A-29 June 2005www.richtek.com

4

RT9161/A

>

>

(

)

(

)

T

T

(

)

Output Voltage

Load Current

Output Voltage

Deviation (mV)

-20

100

mA

-50

Deviation (mV)

60

CIN = 1μF

40

C

TA = 25°C

20

2

0

≈

50

1

1

60

CIN = 1μF

40

C

TA = 25°C

20

0

2 >

Load Transient Response

= 10μF

OUT

T

T

Time (100μs/Div)

Time (100μS/Div)

Load Transient Response

= 10μF

OUT

VIN = 5V
V

= 3.3V

OUT

VIN = 5V
V

= 2.5V

OUT

150

100

50

2 >

Deviation (mV)

Output Voltage

0

-50

≈

≈

200

100

1 >

(mA)

10

Load Current

-100

150

100

50

2 >

Deviation (mV)

Output Voltage

0

Load Transient Response

CIN = 1μF
C

= 10μF

OUT

TA = 25°C

T

T

Time (100μS/Div)

Time (100μs/Div)

Load Transient Response

CIN = 1μF
C

= 10μF

OUT

TA = 25°C

T

VIN = 5V
V

= 3.3V

OUT

VIN = 5V
V

= 2.5V

OUT

≈

-20

≈

100

50

mA

1 >

1

Load Current

-50

Time (100μS/Div)

Time (100μs/Div)

PSRR

0

CIN = 1uF
C

= 10uF Tantalum

OUT

-10

V

= 5V

IN

= 3.3V

V

OUT

T

= 25°C

A

-20

-30

PSRR (dB)

-40

-50

-60
10 100 1000 10000 100000 1000000

Frequency (Hz)

100mA

10mA

-50

Load Current

mA

-100

200

100

10

≈

1 >

T

Time (100μS/Div)

Time (100μs/Div)

≈

≈

PSRR

0

CIN = 1uF
C

= 10uF Tantalum

OUT

-10

V

= 5V

IN

V

= 2.5V

OUT

T

= 25°C

A

-20

-30

PSRR (dB)

-40

-50

-60

1M100K10K1K

10 100 1000 10000 100000 1000000

Frequency (Hz)

100mA

10mA

1M100K10K1K

DS9161/A-29 June 2005 www.richtek.com

5

RT9161/A

Application Information

A 10uF capacitor with 200mΩ or higher ESR, connecting

between VOUT and GND pins, is recommended for

stability. A capacitor with ESR smaller than 200 mΩ may

cause VOUT oscillation as shown in Figure 1. Operating

temperature should be well considered to ensure that the

capacitance is no less than 10uF over the operating

temperature range. Please take the notice that Aluminum

electrolytic capacitors may cause VOUT oscillation when

operating below -25°C. The capacitance can be increased

without limit for better transient response.

A 1uF or higher capacitor should be placed between VIN

and GND to filter out input noise and ensure stable output

voltage.

Region of Stable C

100

V

= 3.3V

IN

= 1uF

C

IN

C

= 10uF

OUT

10

1

ESR (Ω)

OUT

C

0.1

0.01
0 100 200 300 400 500

Load Current (mA)

ESR vs. Load Current

OUT

Stable

Instable

Figure 1

Thermal protection limits power dissipation in RT9161/A.

When the operation junction temperature exceeds 165°C,

the OTP circuit starts the thermal shutdown function and

turns the pass element off. The pass element turn on again

after the junction temperature cools by 30°C.

For continuous operation, do not exceed absolute

maximum operation junction temperature 125°C. The

power dissipation definition in device is:

PD = (VIN-V

OUT

) x I

+ VIN x I

OUT

Q

The maximum power dissipation depends on the thermal

resistance of IC package, PCB layout, the rate of

surroundings airflow and temperature difference between

junction to ambient. The maximum power dissipation can

be calculated by following formula:

D(MAX)

= ( T

J(MAX)

P

Where T

temperature 125°C, T

- TA ) /θ

J(MAX)

JA

is the maximum operation junction

is the ambient temperature and the

A

θJA is the junction to ambient thermal resistance.

For recommended operating conditions specification of

RT9161/A, where T

is the maximum junction

J(MAX)

temperature of the die (125°C) and TA is the maximum

ambient temperature. The junction to ambient thermal

resistance θJA is layout dependent. For SOT-223 packages,

the thermal resistance θJA is 135°C/W on the standard

JEDEC 51-3 single-layer 1S thermal test board. The

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

by following formula:

P

= ( 125°C - 25°C ) / 250 = 0.400 W for SOT-23-3

D(MAX)

packages

P

= ( 125°C - 25°C ) / 175 = 0.571 W for SOT-89

D(MAX)

packages

P

= ( 125°C - 25°C ) / 135 = 0.741 W for SOT-223

D(MAX)

packages

P

= ( 125°C - 25°C ) / 160 = 0.625 W for TO-92

D(MAX)

packages

The maximum power dissipation depends on operating

ambient temperature for fixed T

and thermal

J(MAX)

resistance θJA. For RT9161/A packages, the Figure 2 of

derating curves allows the designer to see the effect of

rising ambient temperature on the maximum power

allowed.

800

700

600

500

400

300

SOT-23-3 package

200

100

Maximum Power Dissipation (mW)

0

0 15 30 45 60 75 90 105 120

SOT-223 package

TO-29 package

SOT-89 package

Ambient Temperature

(°C)

Figure 2. Derating Curves

DS9161/A-29 June 2005www.richtek.com

6

Outline Dimension

RT9161/A

D

E

L

b

e

D1

A1

A

C

Symbol

Dimensions In M illimeters Dimensions In Inches

Min Max Min Max

A 3.175 4.191

A1 1.143 1.372

b 0.406 0.533

C 0.406 0.533

D 4.445 5.207

D1 3.429 5.029

E 4.318 5.334

e 1.143 1.397

L

12.700

3-Lead TO-92 Plastic Package

0.125 0.165

0.045 0.054

0.016 0.021

0.016 0.021

0.175 0.205

0.135 0.198

0.170 0.210

0.045 0.055

0.500

DS9161/A-29 June 2005 www.richtek.com

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RT9161/A

D

C

e

A

b

Dimensions In M illimeters Dimensions In Inches

Symbol

Min Max Min Max

A 0.889 1.295 0.035 0.051

A1 0.000 0.152 0.000 0.006

B

A1

H

L

B 1.397 1.803 0.055 0.071

b 0.356 0.508 0.014 0.020

C 2.591 2.997 0.102 0.118

D 2.692 3.099 0.106 0.122

e 1.803 2.007 0.071 0.079

H 0.080 0.254 0.003 0.010

L 0.300 0.610 0.012 0.024

SOT-23-3 Surface Mount Package

DS9161/A-29 June 2005www.richtek.com

8

D

D1

RT9161/A

A

C

b1

e

b

e

A

b

Dimensions In Millimeters Dimensions In Inches

Symbol

Min Max Min Max

A 1.397 1.600 0.055 0.063

b 0.356 0.483 0.014 0.019

B 2.388 2.591 0.094 0.102

b1 0.406 0.533 0.016 0.021

B

C1

H

C 3.937 4.242 0.155 0.167

C1 0.787 1.194 0.031 0.047

D 4.394 4.597 0.173 0.181

D1 1.397 1.753 0.055 0.069

e 1.448 1.549 0.057 0.061

H 0.356 0.432 0.014 0.017

3-Lead SOT-89 Surface Mount Package

DS9161/A-29 June 2005 www.richtek.com

9

RT9161/A

D

D1

C

e e

A

b

B

L

A1

H

L1

Dimensions In Millimeters Dimensions In Inches

Symbol

Min Max Min Max

A 1.450 1.803 0.057 0.071

A1 0.020 0.100

0.0008

0.0047

b 0.610 0.787 0.024 0.031

B 3.302 3.708 0.130 0.146

C 6.706 7.290 0.264 0.287

D 6.299 6.706 0.248 0.264

D1 2.896 3.150 0.114 0.124

e 2.261 2.362 0.089 0.093

H 0.229 0.330 0.009 0.013

L 1.550 1.950 0.061 0.077

L1 0.800 1.100 0.009 0.013

3-Lead SOT-223 Surface Mount Package

RICHTEK TECHNOLOGY CORP .

Headquarter

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

Hsinchu, Taiwan, R.O.C.

Tel: [phone] Fax: [phone]

RICHTEK TECHNOLOGY CORP .

Taipei Office (Marketing)

8F-1, No. 137, Lane 235, Paochiao Road, Hsintien City

Taipei County, Taiwan, R.O.C.

Tel: [phone] Fax: [phone]

Email: [e-mail]

10

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