RT9164A
1A Fixed and Adjustable Low Dropout Positive Voltage
Regulators
General Description
The RT9164A series of high performance positive voltage
regulators is designed for applications requiring low dropout
performance at fully rated current. Additionally, the RT9164A
series provides excellent regulation over variations in line
and load. Outstanding features include low dropout
performance at rated current, fast transient response,
internal current-limiting, and thermal-shutdown protection
of the output device. The RT9164A series of three terminal
regulators offers fixed and adjustable voltage options
available in space-saving SOT-223, TO-252, and TO-263
packages.
Features
Low Dropout Performance,
1.4V Max
Full Current Rating Over Line and Temperature
Fast Transient Response
±
2% Output Voltage Accuracy
1.5V, 1.8V, 2.5V, 2.85V, 3.0V, 3.3V, and 3.5V Fixed
Adjustable Output Voltage
SOT-223, TO-252, and TO-263 Packages
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Active SCSI Termination
Low Voltage Microcontrollers
Switching Power Supply Post-Regulator
Ordering Information
RT9164A-
Package Type
G : SOT-223
L: TO-252
LR : TO-252 (R-Type)
M : TO-263
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Output Voltage
Default : Adjustable
15 : 1.5V
18 : 1.8V
25 : 2.5V
28 : 2.85V
30 : 3.0V
33 : 3.3V
35 : 3.5V
Note :
Richtek products are :
½
Pin ConFigurations
(TOP VIEW)
3
2
1
VIN
VOUT (TAB)
ADJ/GND
SOT-223
3
2
1
VIN
VOUT (TAB)
ADJ/GND
TO-252
3
2
1
VOUT
ADJ/GND (TAB)
VIN
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
½
TO-252 (R-Type)
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
3
2
1
VIN
VOUT (TAB)
ADJ/GND
TO-263
DS9164A-15 April 2011
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1
RT9164A
Typical Application Circuit
V
IN
= 5V
C
IN
+
RT9164A
VIN
VOUT
ADJ
10uF
V
REF
I
ADJ
R1
133
1%
R2
232
1%
V
OUT
= 3.45V
+
C
OUT
10uF
Tantalum
R
2
V
OUT
= V
REF
(1+ )+I
ADJ
R
2
R
1
(1) C
IN
needed if device is far from filter capacitors.
(2) C
OUT
required for stability.
Figure 1. Adjustable Voltage Regulator
V
IN
= 5V
C
IN
+
RT9164A-33
VIN
VOUT
GND
+
V
OUT
3.3V
C
OUT
10uF
I
Q
10uF
Tantalum
(1) C
IN
needed if device is far from filter capacitors.
(2) C
OUT
required for stability.
Figure 2. Fixed Voltage Regulator
V
IN
= 5V
C
IN
10uF
+
RT9164A-28
VIN
VOUT
GND
C
OUT
+
18 - 27 Lines
22uF
I
Q
Figure 3. Active SCSI Bus Terminator
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DS9164A-15 April 2011
RT9164A
Function Block Diagram
VIN
S.O.A.
Current
Limiting
Amplifier
LIMIT
VOUT
SENSE
Thermal Overload
Voltage
Regulation
Amplifer
V
REF
ADJ/GND
Functional Pin Description
Pin Name
ADJ/GND
VOUT
VIN
Pin Function
Adjust Output or Ground.
Output Voltage.
Power Input.
DS9164A-15 April 2011
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3
RT9164A
Absolute Maximum Ratings
(Note 1)
Supply Input Voltage -------------------------------------------------------------------------------------------------------- 15V
Power Dissipation, P
D
@ T
A
= 25°C
SOT-223 -----------------------------------------------------------------------------------------------------------------------
0.740W
TO-252 -------------------------------------------------------------------------------------------------------------------------
1.471W
TO-263 ------------------------------------------------------------------------------------------------------------------------- 2.222W
Package Thermal Resistance (Note 2)
SOT-223,
θ
JA
------------------------------------------------------------------------------------------------------------------ 135°C/W
SOT-223,
θ
JC
----------------------------------------------------------------------------------------------------------------- 19°C/W
TO-252,
θ
JA
------------------------------------------------------------------------------------------------------------------- 68°C/W
TO-252,
θ
JC
------------------------------------------------------------------------------------------------------------------- 7.5°C/W
TO-263,
θ
JA
------------------------------------------------------------------------------------------------------------------- 45°C/W
TO-263,
θ
JC
------------------------------------------------------------------------------------------------------------------- 7.8°C/W
Lead Temperature (Soldering, 10 sec.) --------------------------------------------------------------------------------- 260°C
Junction Temperature ------------------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range ----------------------------------------------------------------------------------------------
−65°C
to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Mode) ------------------------------------------------------------------------------------------------ 8kV
MM (Machine Mode) -------------------------------------------------------------------------------------------------------- 750V
Recommended Operating Conditions
(Note 4)
Supply Input Voltage -------------------------------------------------------------------------------------------------------- 3V to 14V
Junction Temperature Range ----------------------------------------------------------------------------------------------
−40°C
to 125°C
Electrical Characteristics
(T
A
= 25°C, unless otherwise specified)
Parameter
Reference Voltage
(Note 5)
Symbol
Test Conditions
I
OUT
= 10mA, (V
IN
V
OUT
) = 2V,
T
A
= 25C
10mA
I
OUT
1.0A,
1.5V
V
IN
V
OUT
10V
I
OUT
= 10mA, V
IN
= 3.3V, T
J
= 25C
I
OUT
= 10mA, V
IN
= 3.3V, T
J
= 25C
I
OUT
= 10mA, V
IN
= 4.0V, T
J
= 25C
I
OUT
= 10mA, V
IN
= 4.25V, T
J
= 25C
I
OUT
= 10mA, V
IN
= 4.5V, T
J
= 25C
10mA
I
OUT
1.0A, 4.5V
V
IN
10V
Min
Typ
Max
Unit
V
V
1.243 1.256 1.281
1.231 1.256 1.294
1.485
1.5
1.5
1.53
1.55
1.85
1.87
RT9164A
V
REF
RT9164A -15
RT9164A -18
Output Voltage
(Note 5)
RT9164A -25 V
OUT
RT9164A -28
RT9164A -30
10mA
I
OUT
1.0A, 3.3V
V
IN
10V 1.470
1.797 1.815
10mA
I
OUT
1.0A, 3.3V
V
IN
10V 1.779 1.815
2.475 2.500 2.550
2.822 2.850 2.910
2.970 3.000 3.060
2.940 3.000 3.090
10mA
I
OUT
1.0A, 4.0V
V
IN
10V 2.450 2.500 2.575
10mA
I
OUT
1.0A, 4.25V
V
IN
10V 2.793 2.850 2.936
V
To be continued
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DS9164A-15 April 2011
RT9164A
Parameter
Output Voltage
(Note 5)
RT9164A -35
RT9164A -33
V
OUT
Symbol
Test Conditions
I
OUT
= 10mA, V
IN
= 4.75V, T
J
= 25C
I
OUT
= 10mA, V
IN
= 5V, T
J
= 25C
Min
Typ
Max
Unit
3.267 3.300 3.365
V
10mA
I
OUT
1.0A, 4.75V
V
IN
10V 3.234 3.300 3.400
3.465 3.500 3.570
10mA
I
OUT
1.0A, 5.0V
V
IN
10V 3.430 3.500 3.605
I
OUT
= 10mA,
1.5V
V
IN
V
OUT
10V
I
OUT
= 10mA, 3.3V
V
IN
15V
I
OUT
= 10mA, 3.3V
V
IN
15V
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
--
1.0
--
--
--
--
10mA
I
OUT
1.0A, V
IN
= 5V
--
0.1
1
1
1
1
1
1
1
0.2
1
1
1
1
1
1
1
1.15
1.3
1.8
5
5
72
65
0.2
0.3
6
6
6
6
6
6
6
0.4
10
10
10
10
12
12
15
1.25
1.4
--
10
10
--
120
5
RT9164A
RT9164A -15
Line Regulation
(Note 5)
RT9164A -18
RT9164A -25
RT9164A -28
RT9164A -30
RT9164A -33
RT9164A -35
RT9164A
RT9164A -15
RT9164A -18
Load Regulation
(Note 5)
RT9164A -25
RT9164A -28
RT9164A -30
RT9164A -33
RT9164A -35
Dropout Voltage
Current Limit
Minimum Load Current RT9164A
Quiescent Current
Ripple Rejection
Adjust Pin Current
Adjust Pin Current Change
RT9164A -XX I
Q
PSRR
I
ADJ
I
ADJ
(Note 6)
V
DROP
I
LIM
V
LOAD
V
LINE
%
I
OUT
= 10mA, 4.0V
V
IN
15V
I
OUT
= 10mA, 4.25V
V
IN
15V
I
OUT
= 10mA, 4.5V
V
IN
15V
I
OUT
= 10mA, 4.75V
V
IN
15V
I
OUT
= 10mA, 5.0V
V
IN
15V
(V
IN
V
OUT
) = 3V, 10mA
I
OUT
1.0A
V
IN
= 3.3V, 10mA
I
OUT
1.0A
V
IN
= 3.3V, 10mA
I
OUT
1.0A
V
IN
= 4.0V, 10mA
I
OUT
1.0A
V
IN
= 4.25V, 10mA
I
OUT
1.0A
V
IN
= 4.5V, 10mA
I
OUT
1.0A
V
IN
= 4.75V, 10mA
I
OUT
1.0A
V
IN
= 5.0V, 10mA
I
OUT
1.0A
I
OUT
= 500mA
I
OUT
= 1.0A
V
IN
= 5V
(V
IN
V
OUT
) = 2V
V
IN
= 5V
f
RIPPLE
= 120Hz ,
(V
IN
V
OUT
) = 2V, V
RIPPLE
= 1V
P-P
mV
%
mV
V
A
mA
dB
A
A
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