RT9161

RT9161/A

300/500mA Low Dropout Linear Voltage Regulator

General Description

The RT9161/A is a 300/500mA fixed output voltage lowdropout linear regulator. Typical ground current isapproximately 110µA, from zero to maximum loadingconditions. Wide range of available output voltage fitsmost of applications. Built-in output current-limiting mostthermal-limiting provide maximal protection against anyfault conditions.

For ease of application, the RT9161/A comes in thepopular 3-pin SOT-23(300mA), SOT-89 (300mA),SOT-223 (500mA), or TO-92 packages.

Features

󰀁

Low Dropout Voltage of 200mV at Output Current100mA, 450mV at Output Current 300mA, and750mV at 500mA Output Current

󰀁󰀁󰀁󰀁󰀁󰀁󰀁󰀁

Guaranteed 300/500mA Output Current

Internal 1.5Ω P-MOSFET Draws No Base CurrentLow Ground Current 110µA2% Accuracy Output VoltageInput Voltage Range up to 12VExtremely Tight Load RegulationFast Transient Response

Current-limiting and Thermal-limiting

Ordering Information

RT9161/A-Applications

󰀁󰀁

Package TypeZL : TO-92 (L-Type)ZT : TO-92 (T-Type)X : SOT-89G : SOT-223V : SOT-23Operating Temperature RangeC : Commercial StandardP : Pb Free with Commercial StandardOutput Voltage15 : 1.5V16 : 1.6V :49 : 4.9V50 : 5.0V󰀁

Voltage Regulator for LAN Card, CD-ROM, and DVDWireless Communication SystemsBattery Powered Systems

Pin Configurations

(TOP VIEW)

VIN31231231GND

2VOUT

SOT-23

500mA Output Current300mA Output Current1GNDVINVOUT23VINGNDVOUTMarking Information

For marking information, contact our sales representativedirectly or through a RichTek distributor located in yourarea, otherwise visit our website for detail.

TO-92TO-92RT9161/A- CZLRT9161/A- CZTGND

VINVOUT(TAB)

SOT-89

123GND

VINVOUT(TAB)

SOT-223

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RT9161/A

Typical Application Circuit

RT9161/AVIN

CIN1uFVINVOUTGNDCOUT10uFVOUT

++ElectrolyticFunctional Pin Description

Pin Name Pin Function VOUT Output Voltage GND Ground VIN Power Input

Function Block Diagram

VIN

VOUT

Error Amp-Current LimitingSensor+ThermalShutdown1.2VReferenceGND

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Absolute Maximum Ratings

󰀁Input Voltage-----------------------------------------------------------------------------------------------------------−0.3 to 14V

󰀁Operating Junction Temperature Range------------------------------------------------------------------------−40°C to 125°C󰀁Storage Temperature Range󰀁

---------------------------------------------------------------------------------------−65°C to 150°CPower Dissipation, PD@ TA= 25°C

SOT-89------------------------------------------------------------------------------------------------------------------0.5WTO-92--------------------------------------------------------------------------------------------------------------------0.6WSOT-23------------------------------------------------------------------------------------------------------------------0.15W󰀁

Package Thermal Resistance

SOT-89, θJC------------------------------------------------------------------------------------------------------------100°C /WSOT-89, θJA-------------------------------------------------------------------------------------------300°C/WSOT-223, θJC-----------------------------------------------------------------------------------------15°C/WSOT-223, θJA-----------------------------------------------------------------------------------------60°C/WTO-92, θJA---------------------------------------------------------------------------------------------------------------160°C/WSOT-23, θJA-------------------------------------------------------------------------------------------------------------250°C/W

Electrical Characteristics

(TA = 25°C, CIN = 1µF, COUT = 10µF, unless otherwise specified.)

Parameter Symbol Test Conditions Min Typ Max Units Output Voltage Accuracy ∆VOUT IL = 1mA, VIN = 5V -2 -- +2 % Output Voltage Temperature Coefficient -- 50 150 PPM/°C Line Regulation ∆VLINE IL = 1mA, VIN= 4.5 ~ 12V -- 2 3 %VOUT Load Regulation (1) ∆VLOAD IL = 1mA ~ 300/500mA, VIN = 5V -- 1 30/50 mV Current Limit (2) RT9161 I350 580 -- RT9161A LIMIT VIN= 5V, VOUT = 0V 500 900 -- mA Dropout Voltage (3) (4) VDROP IL = 300/500mA -- 450/750 600/1000 mV Standby Current ISTANDBY IL = 0, VIN = 12V -- 110 180 µA Note:

(1) Regulation is measured at constant junction temperature, using pulsed ON time.(2) Current Limit is measured at constant junction temperature, using pulsed ON time.

(3) Dropout is measured at constant junction temperature, using pulsed ON time, and the criterion is VOUT inside target value

± 2%.

(4) Dropout test is skipped at the condition of VIN < 3V.

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Typical Operating Characteristics

Temperature Stability

3.4

0.140.120.10

Quiescient Current vs. Temperature

3.2

VOUT = 3.3V3

0.080.060.04

2.8

2.6

VOUT = 2.5V0.02

VIN = 5V2.4

-50

-25

0

25

50

75

100

125

0.00

-30

0

30

60

90

120

Temperature(°C)Temperature(°C)

Dropout Voltage (VIN-VOUT)

1

1.4

Short Circuit Current

1.210.80.60.4

125°C0.8

125°C25°C0.6

25°C0.4

0.2

0.2

VOUT = 3.3V00

100

200

300

400

500

00

2

4

6

8

10

ILoad(mA)

Input/Output Differential (V)

Input VoltageDeviation (V)Line Transient Response7654 Input VoltageDeviation (V)Line Transient Response7654COUT = 10µF ElectrolyticIOUT = 0.1ATVOUT = 3.3VTA = 25°CCOUT = 10µF ElectrolyticIOUT = 0.1ATVOUT = 2.5VTA = 25°C≈Output VoltageDeviation (mV)TT≈Output VoltageDeviation (mV)≈10002 >-1001 >-20010002 >-1001 >-200TT≈Time (100µS/Div)Time (100µS/Div)DS9161/A-23 April 2004

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Output VoltageDeviation (mV)60Load Transient ResponseCIN = 1µF40COUT = 10µF20TA = 25°C2 >0 Output VoltageDeviation (mV)150Load Transient ResponseCIN = 1µF100COUT = 10µF50TA = 25°C02 >-50TTVIN = 5VVOUT = 3.3VVIN = 5VVOUT = 3.3VTT-20≈TLoad Current(mA)Load Current(mA)100501-501 >≈≈T2001001 >10≈-100Time (100µS/Div)Time (100µS/Div) Output VoltageDeviation (mV)60Load Transient ResponseCIN = 1µF40COUT = 10µFTA = 25°C2002 >-20TT Output VoltageDeviation (mV)150Load Transient ResponseCIN = 1µF100COUT = 10µFTA = 25°C5002 >-50TTVIN = 5VVOUT = 2.5VVIN = 5VVOUT = 2.5V≈T100≈Load Current(mA)≈T2001001 >10≈Load Current(mA)501 >1-50Time (100µS/Div)-100Time (100µS/Div)PSRR0-10-20-30-40-50PSRR0-10 CIN = 1uF COUT = 10uF Tantalum VIN = 5V VOUT = 3.3V TA = 25°C100mA-20-30-40-50 CIN = 1uF COUT = 10uF Tantalum VIN = 5V VOUT = 2.5V TA = 25°C100mA10mA-601010010001K1000010K100000100K10000001M-601010010mA1K100010K10000100K1000001M1000000Frequency (Hz)Frequency (Hz)DS9161/A-23 April 2004

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Application Information

A 10uF capacitor with 200mΩ or higher ESR, connectingbetween VOUT and GND pins, is recommended forstability. A capacitor with ESR smaller than 200 mΩ maycause VOUT oscillation as shown in Figure 1. Operatingtemperature should be well considered to ensure thatthe capacitance is no less than 10uF over the operatingtemperature range. Please take the notice that Aluminumelectrolytic capacitors may cause VOUT oscillation whenoperating below -25°C. The capacitance can be increasedwithout limit for better transient response.

A 1uF or higher capacitor should be placed between VINand GND to filter out input noise and ensure stable outputvoltage.

Region of Stable COUT ESR vs. Load Current

100

10

VIN = 3.3VCIN = 1uFCOUT = 10uF1

OUTStable0.1

Instable0.01

0

100

200

300

400

500

Load Current (mA)

Figure 1

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Outline DimensionDAELbeD1A1CSymbol A A1 b C D Dimensions In Millimeters Dimensions In Inches 0.125 0.045 0.016 0.016 0.175 0.165 0.054 0.021 0.021 0.205 -- 0.210 0.055 -- Min Max Min Max 3.175 1.143 0.406 0.406 4.445 4.191 1.372 0.533 0.533 5.207 D1 3.429 -- 0.135 E e 4.318 1.143 5.334 1.397 0.170 0.045 L 12.700 -- 0.500 3-Lead TO-92 Plastic Package

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DH

L

CBeAA1

bSymbol A Dimensions In Millimeters Dimensions In Inches Min Max Min Max 0.889 1.295 0.035 0.051 A1 0.000 0.152 0.000 0.006 B b C D e 1.397 0.356 2.591 2.692 1.803 1.803 0.508 2.997 3.099 2.007 0.055 0.014 0.102 0.106 0.071 0.071 0.020 0.118 0.122 0.079 H 0.080 0.254 0.003 0.010 L 0.300 0.610 0.012 0.024

SOT-23 Surface Mount Package

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RT9161/ADD1ACBC1eeHAbb1bDimensions In Inches Symbol A b B b1 C C1 D D1 e H Dimensions In Millimeters Min Max Min Max 1.397 0.356 2.388 0.406 -- 0.787 4.394 1.397 1.448 0.355 1.600 0.483 2.591 0.533 4.242 1.194 4.597 1.753 1.549 0.432 0.055 0.014 0.094 0.016 -- 0.031 0.173 0.055 0.057 0.014 0.063 0.019 0.102 0.021 0.167 0.047 0.181 0.069 0.061 0.017

3-Lead SOT-89 Surface Mount Package

RT9161/ADD1HCBLeeAA1bSymbol A Dimensions In Millimeters Dimensions In Inches Min Max Min Max -- 1.803 -- 0.071 0.0047 0.031 0.146 0.287 0.264 0.124 0.093 0.013 -- 0.0008 A1 0.020 0.100 b B C D D1 e H L 0.610 3.302 6.706 6.299 2.896 2.261 0.229 0.914 0.787 3.708 7.290 6.706 3.150 2.362 0.330 -- 0.024 0.130 0.264 0.248 0.114 0.089 0.009 0.036

3-Lead SOT-223 Surface Mount Package