RT9164C
1A Fixed and Adjustable Low Dropout Positive Voltage
Regulators
General Description
The RT9164C series of high performance positive voltage
regulators is designed for applications requiring low dropout
performance at fully rated current. Additionally, the RT9164C
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 RT9164C 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 Maximal
Full Current Rating Over Line and Temperature
Fast Transient Response
±
1% Output Voltage Accuracy
2.5V and 3.3V 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
RT9164C-
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
25 : 2.5V
33 : 3.3V
Note :
Richtek products are :
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.
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
VOUT
ADJ/GND (TAB)
VIN
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
1
TO-252 (R-Type)
3
2
1
VIN
VOUT (TAB)
ADJ/GND
TO-263
DS9164C-03 April 2011
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1
RT9164C
Typical Application Circuit
V
IN
= 5V
RT9164C
VIN
VOUT
ADJ
V
REF
I
ADJ
R1
133
1%
R2
232
1%
V
OUT
= 3.45V
+
V
IN
= 5V
C
IN
I
Q
+
RT9164C-33
VIN
VOUT
GND
+
V
OUT
= 3.3V
C
OUT
C
IN
10uF
Tantalum
10uF
C
OUT
10uF
Tantalum
(1) C
IN
needed if device is far from filter capacitors.
(2) C
OUT
required for stability.
Function Block Diagram
VIN
Functional Pin Description
Pin Name
ADJ/GND
VOUT
VIN
Pin Function
Adjust Output or Ground.
Output Voltage.
Power Input.
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2
+
10uF
V
OUT
= V
REF
(1+
R
2
)+I
R
R
1 ADJ 2
(1) C
IN
needed if device is far from filter capacitors.
(2) C
OUT
required for stability.
Figure 1. Adjustable Voltage Regulator
Figure 2. Fixed Voltage Regulator
S.O.A.
Current
Limiting
Amplifier
LIMIT
VOUT
SENSE
Thermal Overload
Voltage
Regulation
Amplifer
V
REF
ADJ/GND
DS9164C-03 April 2011
RT9164C
Absolute Maximum Ratings
(Note 1)
15V
0.740W
1.471W
2.222W
135°C/W
Supply Input Voltage ----------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
SOT-223 -------------------------------------------------------------------------------------------------------------------
TO-252 ---------------------------------------------------------------------------------------------------------------------
TO-263 ---------------------------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 2)
SOT-223,
θ
JA
--------------------------------------------------------------------------------------------------------------
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
----------------------------------------------------------------------------------------------------------------
TO-263,
θ
JC
---------------------------------------------------------------------------------------------------------------
Lead Temperature (Soldering, 10 sec.) -----------------------------------------------------------------------------
Junction Temperature ---------------------------------------------------------------------------------------------------
45°C/W
7.8°C/W
260°C
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 12V
Junction Temperature Range ------------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range ------------------------------------------------------------------------------------------
−40°C
to
85°C
Electrical Characteristics
(T
A
= 25°C, unless otherwise specified)
Parameter
Reference Voltage
RT9164C
(Note 5)
Output Voltage
(Note 5)
RT9164C -25
RT9164C -33
RT9164C
Line Regulation
(Note 5)
RT9164C -25
RT9164C -33
Load Regulation
(Note 5)
Dropout Voltage
(Note 6)
Current Limit
RT9164C
RT9164C -33
Symbol
V
REF
V
OUT
Test Conditions
I
OUT
= 10mA, (V
IN
−
V
OUT
) = 2V,
T
A
= 25°C
I
OUT
= 10mA, V
IN
= 4.0V, T
J
= 25°C
I
OUT
= 10mA, V
IN
= 4.75V, T
J
= 25°C
I
OUT
= 10mA,
1.5V
≤
V
IN
−
V
OUT
≤
10V
I
OUT
= 10mA, 4.0V
≤
V
IN
≤
15V
I
OUT
= 10mA, 4.75V
≤
V
IN
≤
15V
(V
IN
−
V
OUT
) = 3V, 10mA
≤
I
OUT
≤
1.0A
V
IN
= 4.75V, 10mA
≤
I
OUT
≤
1.0A
Min
Typ
Max
Unit
V
V
%
mV
%
mV
V
A
1.243 1.256 1.269
2.475 2.500 2.525
3.267 3.300 3.333
--
--
--
--
--
--
--
--
1.0
0.1
1
1
0.2
1
1
1.1
1.3
1.8
0.3
6
6
0.4
10
12
1.2
1.4
--
ΔV
LINE
RT9164C -25
ΔV
LOAD
V
IN
= 4.0V, 10mA
≤
I
OUT
≤
1.0A
I
OUT
= 500mA
I
OUT
= 1.0A
V
IN
= 5V
V
DROP
I
LIM
To be continued
DS9164C-03 April 2011
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3
RT9164C
Parameter
Minimum Load Current RT9164C
RT9164C
Quiescent Current
-XX
Ripple Rejection
Adjust Pin Current
Adjust Pin Current Change
Symbol
Test Conditions
(V
IN
−
V
OUT
) = 2V
I
Q
PSRR
I
ADJ
ΔI
ADJ
10mA
≤
I
OUT
≤
1.0A, V
IN
= 5V
V
IN
= 5V
f
RIPPLE
= 120Hz ,
(V
IN
−
V
OUT
) = 2V, V
RIPPLE
= 1V
P-P
Min
--
--
--
--
--
Typ
5
5
72
65
0.2
Max
10
10
--
120
5
mA
Unit
dB
uA
uA
Note 1.
Stresses listed as the above
“Absolute
Maximum Ratings” may cause permanent damage to the device. These are for
stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the
operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended
periods may remain possibility to affect device reliability.
Note 2.
θ
JA
is measured in the natural convection at T
A
= 25°C on a low effective thermal conductivity test board of
JEDEC 51-3 thermal measurement standard. The case point of
θ
JC
is on the center of the exposed pad. The pad size
is 6mm
2
on SOT-223 packages, 100mm
2
on TO-252 packages, 125mm
2
on TO-263 packages.
Note 3.
Devices are ESD sensitive. Handling precaution is recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
Note 5.
Low duty cycle pulse testing with Kelvin connections.
Note 6.
The dropout voltage is defined as V
IN
−
V
OUT
, which is measured when V
OUT
is V
OUT(NORMAL)
−
100mV.
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4
DS9164C-03 April 2011
RT9164C
Typical Operating Characteristics
Output Voltage vs. Temperature
3.4
1.27
Reference Voltage vs. Temperature
V
OUT
= 3.3V
Reference Voltage (V)
3.0
Output Voltage (V)
1.26
2.6
V
OUT
= 2.5V
2.2
1.25
1.8
V
IN
= 5V
C
IN
=
10uF Electrolytic
C
O
= 10uF Tantalum
R
L
=
∞
-50
-25
0
25
50
75
100
125
1.24
V
IN
= 5V
C
IN
=
10uF Electrolytic
C
O
= 10uF Tantalum
R1 = R2 = 100Ω
R
L
=
∞
-50
-25
0
25
50
75
100
125
1.4
1.23
Temperature
(
°
C)
Temperature
(
°
C)
ADJ Pin Current vs. Temperature
80
Quiescent Current vs. Temperature
7
6
5
4
3
2
1
0
70
Quiescent Current (mA)
ADJ Pin Current (uA)
V
OUT
= 2.5V
60
50
V
IN
= 5V
C
IN
=
10uF Electrolytic
C
O
= 10uF Tantalum
R1 = R2 = 100Ω
R
L
=
∞
-50
-25
0
25
50
75
100
125
40
V
IN
= 5V
C
IN
=
10uF Electrolytic
C
O
= 10uF Tantalum
R
L
=
∞
-50
-25
0
25
50
75
100
125
Temperature
(
°
C)
Temperature
(
°
C)
Current Limit vs. Input Voltage
3.0
2.5
2.0
1.5
1.0
0.5
0.0
2
4
6
8
10
12
14
Current Limit vs. Temperature
2.0
1.9
Current Limit (A)
1
Current Limit (A)
V
OUT
= 2.5V, RL = 1Ω
1.8
V
OUT
= 2.5V, RL = 1Ω
1.7
C
IN
=
10uF Electrolytic
C
O
= 10uF Tantalum
1.6
V
IN
= 5V
C
IN
=
10uF Electrolytic
C
O
= 10uF Tantalum
-50
-25
0
25
50
75
100
125
1.5
Input Voltage (V)
Temperature
(
°
C)
DS9164C-03 April 2011
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5
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