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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
Ordering Information
RT9161/A-
Applications
Voltage Regulator for LAN Card, CD-ROM, and DVD Wireless Communication Systems Battery Powered Systems 886-3-5753170 |E|~ql 86-755-83289224
Package Type ZL : TO-92 (L-Type) ZT : TO-92 (T-Type) X : SOT-89 G : SOT-223 V : SOT-23 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
Pin Configurations
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VIN 3
(TOP VIEW)
123
12
3
1 GND
2 VOUT
SOT-23
500mA Output Current 300mA Output Current
1
GND VIN VOUT
2
3
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.
TO-92 TO-92 CZT RT9161/ACZL RT9161/A-
VIN GND VOUT
GND
VIN VOUT (TAB)
SOT-89
1
2
3
GND
VIN VOUT (TAB)
SOT-223 DS9161/A-23 April 2004
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RT9161/A
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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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RT9161/A
Absolute Maximum Ratings
Input Voltage ----------------------------------------------------------------------------------------------------------- -0.3 to 14V Operating Junction Temperature Range ------------------------------------------------------------------------ -40C to 125C Storage Temperature Range --------------------------------------------------------------------------------------- -65C to 150C Power Dissipation, PD @ TA = 25C SOT-89 ------------------------------------------------------------------------------------------------------------------ 0.5W TO-92 -------------------------------------------------------------------------------------------------------------------- 0.6W SOT-23 ------------------------------------------------------------------------------------------------------------------ 0.15W Package Thermal Resistance SOT-89, JC ------------------------------------------------------------------------------------------------------------ 100C /W SOT-89, JA ------------------------------------------------------------------------------------------- 300 C/W SOT-223, JC ----------------------------------------------------------------------------------------- 15 C/W SOT-223, JA ----------------------------------------------------------------------------------------- 60 C/W TO-92, JA --------------------------------------------------------------------------------------------------------------- 160 C/W SOT-23, JA ------------------------------------------------------------------------------------------------------------- 250 C/W
Electrical Characteristics
(TA = 25C, CIN = 1F, COUT = 10F, unless otherwise specified.)
Parameter Output Voltage Accuracy Output Voltage Temperature Coefficient Line Regulation Load Regulation (1) Current Limit (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 ILIMIT VDROP
IL = 1mA, VIN= 4.5 ~ 12V IL = 1mA ~ 300/500mA, VIN = 5V VIN= 5V, VOUT = 0V IL = 300/500mA
--350 500 ---
Dropout Voltage (3) (4) Standby Current
Note:
450/750 600/1000
ISTANDBY IL = 0, VIN = 12V
(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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RT9161/A
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Typical Operating Characteristics
Temperature Stability
3.4
0.14 0.12 0.10
Quiescient Current vs. Temperature
3.2
VOUT = 3.3V
3
0.08 0.06 0.04
2.8
2.6
VOUT = 2.5V
0.02
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
0.8
1.2 1 0.8 0.6 0.4
25C
0.6
25C
0.4
0.2
0.2
VOUT = 3.3V
0 0 100 200 300 400 500
0 0 2 4 6 8 10
I Load(mA)
Input/Output Differential (V)
Line Transient Response
7
Input Voltage Deviation (V)
Line Transient Response
7
Input Voltage Deviation (V)
6 5 4
COUT = 10F Electrolytic IOUT = 0.1A
T
VOUT = 3.3V TA = 25C
6 5 4
COUT = 10F Electrolytic IOUT = 0.1A
T
VOUT = 2.5V TA = 25C
Output Voltage Deviation (mV)
T T
Output Voltage Deviation (mV)
100 02 > -1001 > -200
100 02 > -1001 > -200
T T
Time (100S/Div)
Time (100S/Div)
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RT9161/A
Load Transient Response
Load Transient Response
Output Voltage Deviation (mV)
Output Voltage Deviation (mV)
60
CIN = 1F 40 COUT = 10F
20 TA = 25C
2 0>
VIN = 5V VOUT = 3.3V
150
CIN = 1F
100 COUT = 10F 50 TA = 25C 02 > -50
T T
VIN = 5V VOUT = 3.3V
T T
-20
Load Current (mA)
Load Current (mA)
100
T
200 100
T
50 1 -50
1>
1 10 >
-100
Time (100S/Div)
Time (100S/Div)
Load Transient Response
Output Voltage Deviation (mV)
40 COUT = 10F 20 02 > -20
Output Voltage Deviation (mV)
Load Transient Response
150
60
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
100
T
Load Current (mA)
200 100
T
Load Current (mA)
50
1 1>
1 10 >
-50
Time (100S/Div)
-100
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
-20 -30 -40 -50
100mA
10mA
-60 10 100 1000 1K 10000 10K 100000 100K 1000000 1M
-60 10 100
10mA 1K 1000 10K 10000 100K 100000 1M 1000000
Frequency (Hz)
DS9161/A-23 April 2004
Frequency (Hz)
5
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.
Region of Stable COUT ESR vs. Load Current
100
10
VIN = 3.3V CIN = 1uF COUT = 10uF
1
OUT
Stable
0.1
Instable
0.01 0 100 200 300 400 500
Load Current (mA)
Figure 1
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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 -5.334 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 -0.210 0.055 --
3-Lead TO-92 Plastic Package
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RT9161/A
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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 Surface Mount Package
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RT9161/A
D D1
A
C
B
C1 e e H A b b
Dimensions In Inches Min 0.055 0.014 0.094 0.016 -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
b1
Symbol A b B b1 C C1 D D1 e H
Dimensions In Millimeters Min 1.397 0.356 2.388 0.406 -0.787 4.394 1.397 1.448 0.355 Max 1.600 0.483 2.591 0.533 4.242 1.194 4.597 1.753 1.549 0.432
3-Lead SOT-89 Surface Mount Package
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RT9161/A
D D1
H
C
B
L e e
A b
A1
Symbol A A1 b B C D D1 e H L
Dimensions In Millimeters Min -0.020 0.610 3.302 6.706 6.299 2.896 2.261 0.229 0.914 Max 1.803 0.100 0.787 3.708 7.290 6.706 3.150 2.362 0.330 --
Dimensions In Inches Min -0.0008 0.024 0.130 0.264 0.248 0.114 0.089 0.009 0.036 Max 0.071 0.0047 0.031 0.146 0.287 0.264 0.124 0.093 0.013 --
3-Lead SOT-223 Surface Mount Package
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