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RT9161/A
300/500mA Low Dropout Linear Voltage Regulator
General Description
The RT9161/A is a 300/500mA fixed output voltage low dropout linear regulator. Typical ground current is approximately 110A, 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.
Features
Low Dropout Voltage of 200mV at Output Current 100mA, 450mV at Output Current 300mA, and 750mV at 500mA Output Current Guaranteed 300/500mA Output Current Internal 1.5 P-MOSFET Draws No Base Current Low Ground Current 110A 2% Accuracy Output Voltage Input Voltage Range up to 12V Extremely Tight Load Regulation Fast Transient Response Current-limiting and Thermal-limiting RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT9161/APackage Type V : SOT-23-3 X : SOT-89 G : SOT-223 ZL : TO-92 (L-Type) ZT : TO-92 (T-Type) Operating Temperature Range P : Pb Free with Commercial Standard G : Green (Halogen Free with Commercial Standard) Output Voltage 15 : 1.5V 16 : 1.6V : 49 : 4.9V 50 : 5.0V 500mA Output Current 300mA Output Current
Applications
Voltage Regulator for LAN Card, CD-ROM, and DVD Wireless Communication Systems 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 GND 2 VOUT
1
2
3
Note : RichTek Pb-free and Green 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. 100%matte tin (Sn) plating.
SOT-23-3
GND
VIN VOUT (TAB)
SOT-89
1
2
3
GND
VIN VOUT (TAB)
SOT-223 DS9161/A-31 March 2007 www.richtek.com 1
RT9161/A
3 2 1 VOUT GND VIN
3 2 1
VOUT VIN GND
TO-92 RT9161/ACZL
TO-92 CZT RT9161/A-
Typical Application Circuit
RT9161/A VIN CIN 1uF VIN VOUT GND COUT 10uF VOUT
+ +
Electrolytic
Functional Pin Description
Pin Name VOUT GND VIN Pin Function Output Voltage Ground Power Input
Function Block Diagram
VIN VOUT Error Amp +
Current Limiting Sensor
Thermal Shutdown
1.2V
Reference
GND
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DS9161/A-31 March 2007
RT9161/A
Absolute Maximum Ratings
Input Voltage ----------------------------------------------------------------------------------------------------------Operating Junction Temperature Range ------------------------------------------------------------------------Storage Temperature Range --------------------------------------------------------------------------------------Power Dissipation, PD @ TA = 25C SOT-23-3 --------------------------------------------------------------------------------------------------------------SOT-89 -----------------------------------------------------------------------------------------------------------------SOT-223 ---------------------------------------------------------------------------------------------------------------TO-92 -------------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 4) SOT-23-3, JA ---------------------------------------------------------------------------------------------------------SOT-23-3, JC --------------------------------------------------------------------------------------------------------SOT-89, JA -----------------------------------------------------------------------------------------------------------SOT-89, JC -----------------------------------------------------------------------------------------------------------SOT-223, JA ----------------------------------------------------------------------------------------------------------SOT-223, JC ---------------------------------------------------------------------------------------------------------TO-92, JA -------------------------------------------------------------------------------------------------------------TO-92, JC --------------------------------------------------------------------------------------------------------------
-0.3 to 14V -40C to 125C -65C to 150C
0.4W 0.571W 0.741W 0.625W 250C/W 140C/W 175C/W 100C/W 135C/W 15C/W 160C/W 125C/W
Electrical Characteristics
(TA = 25C, CIN = 1F, COUT = 10F, unless otherwise specified.)
Parameter Output Voltage Accuracy Output Voltage Temperature Coefficient Line Regulation Load Regulation (Note1) Current Limit (Note 2) RT9161 RT9161A
Symbol VOUT
Test Conditions IL = 1mA, VIN = 5V
Min -2 --
Typ -50 2 1 580 900 110
Max +2 150 3 30/50 --180
Units % PPM/C %VOUT mV mA mV A
VLINE VLOAD ILIM VDROP
IL = 1mA, VIN= 4.5 ~ 12V IL = 1mA ~ 300/500mA, VIN = 5V VIN= 5V, VOUT = 0V IL = 300/500mA
--350 500 ---
Dropout Voltage (Note 3) Standby Current
450/750 600/1000
ISTANDBY IL = 0, VIN = 12V
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 VIN -VOUT, which is measured when VOUT is VOUT(NORMAL) - 100mV. Note 4. JA is measured in the natural convection at TA = 25C on a low effective single layer thermal conductivity test board of JEDEC 51-3 thermal measurement standard.
DS9161/A-31 March 2007
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RT9161/A
Typical Operating Characteristics
Temperature Stability
3.4
Quiescient Current vs. Temperature
0.14 0.12
Quiescient Current (mA)
Output Voltage (V)
3.2
VOUT = 3.3V
0.10 0.08 0.06 0.04 0.02
3
2.8
2.6
VOUT = 2.5V
VIN = 5V
2.4 -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
125C
125C
Short Circuit Current (A)
Dropout Voltage (V)
0.8
1.2 1 0.8 0.6 0.4 0.2 0
25C
0.6
25C
0.4
0.2
VOUT = 3.3V
0 0 100 200 300 400 500
0
2
4
6
8
10
I Load (mA)
Input/Output Differential (V)
Line Transient Response
7 Input Voltage Deviation (V) 6 5 4
Input Voltage Deviation (V)
Line Transient Response
7 6 5 4
COUT = 10F Electrolytic IOUT = 0.1A
T
VOUT = 3.3V TA = 25C
COUT = 10F Electrolytic IOUT = 0.1A
T
VOUT = 2.5V TA = 25C
Output Voltage Deviation (mV) 100 02 > -1001 > -200
T T
Output Voltage Deviation (mV)
100 02 > -1001 > -200
T T
Time (100S/Div) Time (100s/Div)
Time (100S/Div) Time (100s/Div)
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DS9161/A-31 March 2007
RT9161/A
Load Transient Response
Output Voltage Deviation (mV)
Output Voltage Deviation (mV)
Load Transient Response
150
60
CIN = 1F 40 COUT = 10F
20 TA = 25C
2 0>
VIN = 5V VOUT = 3.3V
CIN = 1F
100 COUT = 10F 50 TA = 25C 02 > -50
T T
VIN = 5V VOUT = 3.3V
T T
-20 Load Current (mA)
T
Load Current (mA)
100 50 1 -50
1>
T
200 100
1 10 >
-100
Time (100s/Div) Time (100S/Div)
Time (100S/Div) Time (100s/Div)
Load Transient Response
Output Voltage Deviation (mV) 40 COUT = 10F 20 02 > -20 Load Current (mA) Output Voltage Deviation (mV) 60
Load Transient Response
150
CIN = 1F
VIN = 5V VOUT = 2.5V
CIN = 1F
100 COUT = 10F 50 02 > -50
VIN = 5V VOUT = 2.5V
TA = 25C
T T
TA = 25C
T T
T
Load Current (mA)
T
100 50
1 1>
200 100
1 10 >
-50
Time (100S/Div) Time (100s/Div)
-100
Time (100S/Div) Time (100s/Div)
0 -10 -20 -30 -40 -50
PSRR
CIN = 1uF COUT = 10uF Tantalum VIN = 5V VOUT = 3.3V TA = 25C
0 -10
PSRR
CIN = 1uF COUT = 10uF Tantalum VIN = 5V VOUT = 2.5V TA = 25C
100mA
100mA
PSRR (dB)
PSRR (dB)
10mA
-20 -30 -40 -50
10mA
-60 10 100
-60 10 100 1000 1K 10000 10K 100000 100K 1000000 1M
1K 1000
10K 10000
100K 100000
1M 1000000
Frequency (Hz)
DS9161/A-31 March 2007
Frequency (Hz)
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RT9161/A
Application Information
A 10uF capacitor with 200m or higher ESR, connecting between VOUT and GND pins, is recommended for stability. A capacitor with ESR smaller than 200 m 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 -25C. 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. PD(MAX) = ( TJ(MAX) - TA ) /JA Where T J(MAX) is the maximum operation junction temperature 125C, TA is the ambient temperature and the JA is the junction to ambient thermal resistance. For recommended operating conditions specification of RT9161/A, where T J(MAX) is the maximum junction temperature of the die (125C) and TA is the maximum ambient temperature. The junction to ambient thermal resistance JA is layout dependent. For SOT-223 packages, the thermal resistance JA is 135C/W on the standard JEDEC 51-3 single-layer 1S thermal test board. The maximum power dissipation at TA = 25C can be calculated by following formula: PD(MAX) = ( 125C - 25C ) / 250 = 0.400 W for SOT-23-3 packages PD(MAX) = ( 125C - 25C ) / 175 = 0.571 W for SOT-89 packages PD(MAX) = ( 125C - 25C ) / 135 = 0.741 W for SOT-223 packages
Stable
0.1
Region of Stable COUT ESR vs. Load Current
100
10
VIN = 3.3V CIN = 1uF COUT = 10uF
C OUT ESR ()
1
Instable
PD(MAX) = ( 125C - 25C ) / 160 = 0.625 W for TO-92 packages The maximum power dissipation depends on operating ambient temperature for fixed T J(MAX) and thermal resistance JA. 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.
Maximum Power Dissipation (mW)
800
0.01 0 100 200 300 400 500
Load Current (mA)
Figure 1 Thermal protection limits power dissipation in RT9161/A. When the operation junction temperature exceeds 165C, 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 30C. For continuous operation, do not exceed absolute maximum operation junction temperature 125C. The power dissipation definition in device is: PD = (VIN-VOUT) x IOUT + VIN x IQ 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:
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SOT-223 package
700 600 500 400 300 200 100 0 0 15 30 45 60 75 90 105 120
TO-29 package SOT-89 package
SOT-23-3 package
Ambient Temperature (C)
Figure 2. Derating Curves
DS9161/A-31 March 2007
RT9161/A
Outline Dimension
D
A
E
L
e D1
b
C
A1
Symbol A A1 b C D D1 E e L
Dimensions In Millimeters Min 3.175 1.143 0.406 0.406 4.445 3.429 4.318 1.143 12.700 Max 4.191 1.372 0.533 0.533 5.207 5.029 5.334 1.397
Dimensions In Inches Min 0.125 0.045 0.016 0.016 0.175 0.135 0.170 0.045 0.500 Max 0.165 0.054 0.021 0.021 0.205 0.198 0.210 0.055
3-Lead TO-92 Plastic Package
DS9161/A-31 March 2007
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RT9161/A
D
H L
C
B
e
A A1 b
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.889 0.000 1.397 0.356 2.591 2.692 1.803 0.080 0.300 Max 1.295 0.152 1.803 0.508 2.997 3.099 2.007 0.254 0.610
Dimensions In Inches Min 0.035 0.000 0.055 0.014 0.102 0.106 0.071 0.003 0.012 Max 0.051 0.006 0.071 0.020 0.118 0.122 0.079 0.010 0.024
SOT-23-3 Surface Mount Package
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DS9161/A-31 March 2007
RT9161/A
D D1
A
C
B
C1 e e H A b b
b1
Symbol A b B b1 C C1 D D1 e H
Dimensions In Millimeters Min 1.397 0.356 2.388 0.406 3.937 0.787 4.394 1.397 1.448 0.356 Max 1.600 0.483 2.591 0.533 4.242 1.194 4.597 1.753 1.549 0.432
Dimensions In Inches Min 0.055 0.014 0.094 0.016 0.155 0.031 0.173 0.055 0.057 0.014 Max 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
DS9161/A-31 March 2007
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RT9161/A
D D1
H
C
B
L e e
L1
A b
A1
Symbol A A1 b B C D D1 e H L L1
Dimensions In Millimeters Min 1.450 0.020 0.610 3.302 6.706 6.299 2.896 2.261 0.229 1.550 0.800 Max 1.803 0.100 0.787 3.708 7.290 6.706 3.150 2.362 0.330 1.950 1.100
Dimensions In Inches Min 0.057 0.0008 0.024 0.130 0.264 0.248 0.114 0.089 0.009 0.061 0.009 Max 0.071 0.0047 0.031 0.146 0.287 0.264 0.124 0.093 0.013 0.077 0.013
3-Lead SOT-223 Surface Mount Package
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) 8F, No. 137, Lane 235, Paochiao Road, Hsintien City Taipei County, Taiwan, R.O.C. Tel: (8862)89191466 Fax: (8862)89191465 Email: marketing@richtek.com
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DS9161/A-31 March 2007

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