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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-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
Applications
Voltage Regulator for LAN Card, CD-ROM, and DVD Wireless Communication Systems Battery Powered Systems
Pin Configurations
Part Number RT9161/ACZL/T (Plastic TO-92)
123
Pin Configurations
TOP VIEW ZT ZL 1. GND 1. VIN 2. GND 2. VIN 3. VOUT 3. VOUT TOP VIEW 1. GND 2. VOUT 3. VIN TOP VIEW 1. GND 2. VIN (TAB) 3.VOUT TOP VIEW 1. GND 2. VIN (TAB) 3. VOUT
Ordering Information
RT9161/APackage type ZL : TO-92 ZT : TO-92 X : SOT-89 G : SOT-223 V : SOT-23 Operating temperature range C: Commercial standard Output voltage 15 : 1.5V 16 : 1.6V : 500mA output current 300mA output current
RT9161CV (Plastic SOT-23)
1
3
2
RT9161/ACX (Plastic SOT-89)
1 2 3
RT9161ACG (Plastic SOT-223)
1 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.
Typical Application Circuit
VIN RT9161/A VIN VOUT GND VOUT + 10F _C
O UT
1F + CIN _
Electrolytic
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RT9161/A
Absolute Maximum Ratings
* * * * Input Voltage Operating Junction Temperature Range Storage Temperature Range Power Dissipation, PD @ TA = 25C SOT-89 TO-92 SOT-23 * Package Thermal Resistance SOT-89, JC SOT-89, JA SOT-223, JC SOT-223, JA TO-92, JA SOT-23, JA -0.3 ~ 14V -40C ~ 125C -65C ~ 150C 0.5W 0.6W 0.15W 100C /W 300C/W 15C/W 60C/W 160C/W 250C/W
Electrical Characteristics
(TA = 25C, CIN = 1F, COUT = 10F, unless otherwise specified.) Parameter Output Voltage Accuracy Output Voltage Temperature Coefficient Line Regulation Load Regulation (2) Current Limit (3) RT9161 RT9161A VLINE VLOAD ILIMIT VDROP IL = 1mA, VIN = 4.5 ~ 12V IL = 1mA ~ 300/500mA, VIN = 5V VIN = 5V, VOUT = 0V IL = 300/500mA Symbol VOUT Test Conditions IL = 1mA, VIN = 5V Min -2 ---350 500 --Typ -50 2 1 580 900 110 Max +2 150 3 30/50 --180 Units % PPM/C %VOUT mV mA mV A
Dropout Voltage (4) (5) Standby Current
450/750 600/1000
ISTANDBY IL = 0, VIN = 12V
Note: (1) Guaranteed by design. (2) Regulation is measured at constant junction temperature, using pulsed ON time. (3) Current Limit is measured at constant junction temperature, using pulsed ON time. (4) Dropout is measured at constant junction temperature, using pulsed ON time, and the criterion is VOUT inside target value 2%. (5) Dropout test is skipped at the condition of VIN < 3V.
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RT9161/A
Pin Description
Pin Name VOUT GND VIN Pin Function Output Voltage Ground Power Input
Function Block Diagram
VIN
VOUT
Current Limiting Sensor
Error Amp _+
Thermal Shutdown
1.2V Reference
GND
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RT9161/A
Typical Operating Charateristics
3.4
Temperature Stability
0.14 0.12 0.10
Quiescient Current
3.2
VOUT = 3.3V
Output Voltage (V)
3
I (mA)
0.08 0.06 0.04
2.8
2.6
VOUT = 2.5V
0.02 0.00
2.4 -50 -25 0 25 50 75 100 125
VIN = 5V
-30 0
Temperature (C) ()
Temperature ( C)
30
60
90
120
Dropout Voltage (Vin-Vout)
1
Short Circuit Current
1.4
125C
Short Circuit Current (A)
0.8
125C 25C
1.2 1 0.8 0.6 0.4 0.2
Dropout Voltage (V)
0.6
25C
0.4
0.2
VOUT = 3.3V
0 0 100 200 300 400 500
0 0 2 4 6 8 10
ILoad(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)
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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)
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 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
100
T
Load Current (mA)
200 100
T
50 1 -50
1>
1 10 >
Time (100S/Div)
-100
Time (100S/Div)
PSRR
0
PSRR
0 -10
CIN = 1uF
-10 -20
COUT = 1uF Ceramic Capacitor VIN = 5V VOUT = 3.3V TA = 25 C
100mA
-20
PSRR (dB)
PSRR (dB)
CIN = 1uF COUT = 1uF Ceramic Capacitor VIN = 5V VOUT = 2.5V TA = 25 C
100mA
-30 -40 -50
-30 -40 -50
10mA
-60 10 10 100 100 1K 1000 10K 10000 100K 100000 1M 1000000
10mA
-60 10 10 100 100 1K 1000 10K 100000 1000000 100K 1M 10000
Frequency (Hz)
Frequency (Hz)
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RT9161/A
Application Information
A 10F (or larger) capacitor is recommended between VOUT and GND for stability. The part may oscillate without the capacitor. Any type of capacitor can be used, but not Aluminum electrolytics when operating below -25C. The capacitance may be increased without limit. A 1F capacitor (or larger) should be placed between VIN to GND.
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RT9161/A
Package Information
A
D
E
L
e
e
b
C
D1 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 -3-Lead TO-92 Package
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 --
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RT9161/A
D
C
B
e
A b A1 L
H
Symbol A A1 B b C D e H L
Dimensions In Millimeters Min 0.889 -1.397 0.356 2.591 2.692 1.803 0.102 0.356 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 -0.055 0.014 0.102 0.106 0.071 0.004 0.014 Max 0.051 0.006 0.071 0.020 0.118 0.122 0.079 0.010 0.024
SOT-23 Plastic Surface Mount
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RT9161/A
D D1
A H
C
B
C1 e e
A
b
b1
b
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
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
3-Lead SOT-89 Surface Mount
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RT9161/A
D D1
C
B
L e e
A b
A1
H
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 Plastic Surface Mount
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RICHTEK TECHNOLOGY CORP.
Headquarter
5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611
RICHTEK TECHNOLOGY CORP.
Taipei Office (Marketing)
8F-1, 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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