RT9165
DS9165-08 July 2002
www.richtek.com
1
150mA 3-Terminal Positive Regulator
General Description
The RT9165 is a positive low dropout regulator
designed for applications requiring low dropout
performance at full rated current. The device is
available in fixed output voltage of 5.0V or 8.0V. The
RT9165 provides excellent regulation over line, load,
and temperature variations.
The other features include low dropout performance
at a maximum of 1.3V at 150mA, fast transient
response, internal current limiting, and thermal
shutdown protection of the output devices. The
RT9165 is a three-terminal regulator compatible with
industrial LM78L05/L08 and available in surface
mount SOT-89 package.
Ordering Information
RT9165-
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
Features
Low Dropout, Maximum 1.3V at 150mA
Fast Transient Response
2% Total Output Regulation
0.5% Line Regulation
0.5% Load Regulation
SOT-89 and TO-92 Packages
Applications
5V or 8V Output Linear Regulator
Consumer Equipment Power Supply
Pin Configurations
Part Number
Pin Configurations
RT9165-CZ
(Plastic TO-92)
TOP VIEW
1. VOUT
2. GND
3. VIN
RT9165-
CX
(Plastic SOT-89)
TOP VIEW
1. VOUT
2. GND (TAB)
3. VIN
Pin Description
Pin Name
Pin Function
VOUT
Output Voltage
GND
Ground
VIN
Power Input
Output voltage
Default : 5.0V
80 : 8.0V
Operating temperature range
C: Commercial standard
Package type
Z : TO-92
X : SOT-89
V
IN
V
OUT
C1
10
F
VOUT
GND
VIN
C2
10
F
RT9165
+
+
1
2
3
1 2 3
RT9165
www.richtek.com
DS9165-08 July 2002
2
Function Block Diagram
Absolute Maximum Ratings
Input Voltage
16V
Power Dissipation, P
D
@ T
A
= 25
C
TO-92
0.6W
SOT-89
0.5W
Package Thermal Resistance
TO-92,
JA
160
C/W
SOT-89,
JC
100
C/W
SOT-89,
JA
300
C/W
Operating Junction Temperature Range
-
40
C to 125
C
Storage Temperature Range
-
65
C to 150
C
Electrical Characteristics
(V
IN
= 7.0V, T
A
= 25
C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
RT9165
4.900
5.000
5.100
Output Voltage
(1)
RT9165-80
V
OUT
V
IN
= V
OUT
+ 2V
7.840
8.000
8.160
V
Line Regulation
(1)
V
LINE
V
IN
= 7V - 16V
--
0.1
0.5
%
Load Regulation
(1)
V
LOAD
I
L
= 0~150mA
--
0.2
0.5
%
Dropout Voltage
(2)
V
DROP
V
OUT
=1%
--
1.2
1.3
V
Current Limit
I
LIMIT
300
--
--
mA
Quiescent Current
I
Q
--
4.5
8
mA
Temperature Coefficient
T
C
--
0.005
--
%/
C
Temperature Stability
T
S
--
0.5
--
%
RMS Output Noise
(3)
--
0.003
--
%/V
OUT
Notes:
(1) Low duty cycle pulse testing with Kelvin connections required.
(2) Dropout voltage is defined as the input to output differential at which the output voltage drops 1% below the
value measured with a 2V differential.
(3) Bandwidth of 10 Hz to 10 kHz.
V
IN
Thermal
Shutdown
V
OUT
Q1
R4
V
REF
R3
R1
R2
Q2
Error Amplifier
Buffer
Amplifier
Current
Limiting
Sensor
+ _
RT9165
DS9165-08 July 2002
www.richtek.com
3
Typical Operating Charateristics
Dropout Voltage (Vin-Vout)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
0
25
50
75
100
125
150
ILoad(mA)
Drop
o
u
t
V
o
l
t
ag
e (V
)
V
OUT
= 5V
T
J
= 25
T
J
= 125
C
C
T
T
T
1 >
2 >
Load Transient Response
Time (100
S/Div)
Load
Current
(m
A
)
Out
put
V
o
lt
age
Deviat
ion (
m
V
)
100
10
-100
60
40
20
0
-20
-40
C
IN
= 10
F C
OUT
= 10
F Electrolytic
V
IN
= 8V
V
OUT
= 5V
T
A
= 25
C
T
T
T
1 >
2 >
Load Transient Response
Time (100
S/Div)
Load
Current
(m
A
)
Out
put
V
o
lt
age
Deviat
ion (
m
V
)
50
1
-50
60
40
20
0
-20
-40
C
IN
= 10
F C
OUT
= 10
F Electrolytic
V
IN
= 8V
V
OUT
= 5V
T
A
= 25
C
Temperature Stability
4.7
4.8
4.9
5
5.1
5.2
-50
-25
0
25
50
75
100
125
Temperature ( )
O
u
t
put
V
o
l
t
a
g
e
(
V
)
V
OUT
= 5V
C
Short Circuit Current
0
0.1
0.2
0.3
0.4
5
6
7
8
9
10
Input Voltage (V)
S
h
ort
Ci
rc
u
i
t
Cu
rren
t
(A
)
125
C
25
C
25
C
PSRR
-80
-70
-60
-50
-40
-30
-20
-10
0
10
100
1000
10000 100000 100000
0
1E+07
Frequency (Hz)
PS
R
R
(
d
B)
C
IN
= 1nF
C
OUT
= 10uF
Electrolytic Capacitor
V
IN
= 8V
V
OUT
= 5V
T
A
= 25
100mA
10mA
C
10 100 1K 10K 100K 1M 10M
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