RT9164
1A Fixed and Adjustable Low Dropout
Positive Voltage Regulators
General Description
The RT9164 series of high performance positive
voltage regulators is designed for applications
requiring low dropout performance at fully rated
current. Additionally, the RT9164 series provides
excellent regulation over variations in line and load.
Outstanding
performance
features
at
rated
include
current,
low
fast
dropout
transient
Features
Low Dropout Performance, 1.4V Max.
Full Current Rating Over Line and Temperature
Fast Transient Response
±
1% Output Voltage Accuracy
2.5V, 2.85V, 3.3V, and 3.5V Fixed/Adjustable
Output Voltage
SOT-223 and TO-252 Packages
response, internal current-limiting, and thermal-
shutdown protection of the output device. The
RT9164 series of three terminal regulators offers
fixed and adjustable voltage options available in
space-saving SOT-223, and TO-252 packages.
Applications
Active SCSI Termination
Low Voltage Microcontrollers
Switching Power Supply Post-Regulator
Ordering Information
RT9164-
Package type
G : SOT-223
L : TO-252 (DPAK)
LR : TO-252
Operating temperature range
C: Commercial standard
Output voltage
Default : Adjustable
25 : 2.5V
28 : 2.85V
33 : 3.3V
35 : 3.5V
Pin Configurations
Part Number
RT9164-
CG
Pin Configurations
TOP VIEW
1. ADJ/GND
1
2
3
(Plastic SOT-223)
2. VOUT (TAB)
3. VIN
TOP VIEW
1. ADJ/GND
2. VOUT (TAB)
RT9164-
CL
(Plastic TO-252)
1
2
3
3. VIN
TOP VIEW
1. VIN
2. GND (TAB)
RT9164-
CLR
(Plastic TO-252)
1
2
3
3. VOUT
DS9164-08 May 2001
www.richtek-ic.com.tw
1
RT9164
Absolute Maximum Ratings
Input Voltage
Package Thermal Resistance
SOT-223,
θ
JC
SOT-223,
θ
JA
TO-252,
θ
JC
TO-252,
θ
JA
(1)
12V
15
°
C/W
60
°
C/W
15
°
C/W
56°C/W
0°C to 125°C
−65°C
to 150°C
260°C
2
(1)
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
Note: (1) Minimum pad size of 0.038 IN
Electrical Characteristics
(T
A
= 25°C, unless otherwise specified)
Parameter
(1)
Symbol
Test Conditions
I
OUT
= 10mA, (V
IN
-V
OUT
) = 2V,
T
A
= 25°C
10mA
<
I
OUT
<
1A,
1.4V
<
V
IN
-V
OUT
<
10V
I
OUT
= 10mA, V
IN
= 4.0V, T
J
= 25°C
0
<
I
OUT
<
1A, 4.0V
<
V
IN
<
10V
0
<
I
OUT
<
1A, 4.25V
<
V
IN
<
10V
0
<
I
OUT
<
1A, 4.75V
<
V
IN
<
10V
I
OUT
= 10mA, V
IN
= 5V, T
J
= 25°C
0
<
I
OUT
<
1A, 5.0V
<
V
IN
<
10V
I
OUT
= 10mA,
1.5V
≤
V
IN
-V
OUT
≤
10V
Min
Typ
Max
Units
V
V
V
V
V
V
V
V
V
V
%
mV
mV
mV
mV
%
mV
mV
mV
mV
1.238 1.250 1.262
1.225 1.250 1.270
2.475 2.500 2.525
2.450 2.500 2.550
2.790 2.850 2.910
3.235 3.300 3.365
3.465 3.500 3.535
3.430 3.500 3.570
--
--
--
--
--
--
--
--
--
--
0.1
1
1
1
1
0.2
1
1
1
1
0.3
6
6
6
6
0.4
10
10
10
15
Reference Voltage
RT9164
V
REF
RT9164-25
RT9164-28
Output Voltage
(1)
I
OUT
= 10mA, V
IN
= 4.25V, T
J
= 25°C 2.820 2.850 2.880
V
OUT
I
OUT
= 10mA, V
IN
= 4.75V, T
J
= 25°C 3.267 3.300 3.333
RT9164-33
RT9164-35
RT9164
(1)
RT9164-25
RT9164-28
RT9164-33
RT9164-35
RT9164
∆V
LINE
Line Regulation
I
OUT
= 0mA, 4.0V
≤
V
IN
≤
12V
I
OUT
= 0mA, 4.25V
≤
V
IN
≤
12V
I
OUT
= 0mA, 4.75V
≤
V
IN
≤
12V
I
OUT
= 0mA, 5.0V
≤
V
IN
≤
12V
(V
IN
-V
OUT
) = 3V,
0mA
≤
I
OUT
≤
1A
Load Regulation
(1)
RT9164-25
RT9164-28
RT9164-33
RT9164-35
∆V
LOAD
V
IN
= 4.0V, 0
≤
I
OUT
≤
1A
V
IN
= 4.25V, 0
≤
I
OUT
≤
1A
V
IN
= 4.75V, 0
≤
I
OUT
≤
1A
V
IN
= 5.0V, 0
≤
I
OUT
≤
1A
To be continued
www.richtek-ic.com.tw
DS9164-08 May 2001
2
RT9164
Parameter
Symbol
Test Conditions
I
OUT
= 100mA
Dropout Voltage
(2)
Min
--
--
--
--
1000
--
--
--
--
Typ
1.1
1.15
1.2
1.3
--
5
5
72
65
0.2
Max Units
1.2
1.25
1.3
1.4
2000
10
10
--
120
5
V
V
V
V
mA
mA
mA
dB
µA
µA
V
DROP
I
OUT
= 500mA
I
OUT
= 800mA
I
OUT
= 1000mA
V
IN
= 5V
(V
IN
-V
OUT
) = 2V
V
IN
= 5V
f
RIPPLE
= 120Hz ,
(V
IN
- V
OUT
) = 2V, V
RIPPLE
= 1V
P-P
10mA
≤
I
OUT
≤
1A, V
IN
= 5V
Current Limit
Minimum Load Current RT9164
Quiescent Current
Ripple Rejection
Adjust Pin Current
Adjust Pin Current Change
Notes:
I
LIMIT
RT9164-XX I
Q
PSRR
I
ADJ
∆I
ADJ
--
(1) Low duty cycle pulse testing with Kelvin connections.
(2)
ΔV
OUT
and
ΔV
REF
= 1%.
Function Block Diagram
VIN
S.O.A.
CURRENT
LIMITING
AMPLIFIER
LIMIT
SENSE
THERMAL OVERLOAD
VOLTAGE
REGULATION
AMPLIFIER
VOUT
V
REF
ADJ/GND
Pin Description
Pin Name
ADJ/GND
VOUT
VIN
Pin Function
Adjust or Ground
Output Voltage
Power Input
DS9164-08 May 2001
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3
RT9164
Typical Application Circuit
V
IN
= 5V
RT9164
VIN
VOUT
ADJ
V
REF
+
C1
10µF
V
OUT
= 3.45V
R1
133
1%
R2
232
1%
+ C2
10µF
Tantalum
R
2
) + I
ADJ
R
2
R
1
I
ADJ
V
OUT
= V
REF
(1+
(1) C1 needed if device is far from filter capacitors.
(2) C2 required for stability.
Fig. 1 Adjustable Voltage Regulator
RT9164-28
VIN
VOUT
GND
+
+
22µF
18 -27 Lines
10µF
Fig. 2 Active SCSI Bus Terminator
V
IN
= 5V
RT9164-33
VIN
VOUT
GND
+ C1
10µF
V
OUT
3.3V
+ C2
10µF
Tantalum
I
Q
(1) C1 needed if device is far from filter capacitors.
(2) C2 required for stability.
Fig. 3 Fixed Voltage Regulator
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DS9164-08 May 2001
4
RT9164
Typical Operating Characteristics
Load Regulation
0
Adjust Pin Current
100
90
∆Load
= 1A
Output Voltage Deviation (%)
Adjust Pin Current (
µ
A)
-0.05
-0.1
-0.15
-0.2
-0.25
-0.3
-0.35
-50
-25
0
80
70
60
50
40
30
20
10
0
Temperature (
°
C)
25
50
75
100
125
-50
-25
0
25
50
75
100
125
Temperature (
°
C)
RT9164-ADJ Ripple Rejection
0
Ripple Rejection & Current
-20
-30
Ripple Rejection(dB)
-20
Ripple Rejection(dB)
C
OUT
= 20µF Tantalum
C
ADJ
= 22µF Electrolytic
I
OUT
= 0.5A
C
OUT
= 20µF Tantalum
C
ADJ
= 22µF Electrolytic
-40
-50
-60
-70
-80
-90
f
RIPPLE
= 20KHz
f
RIPPLE
= 120Hz
-40
-60
-80
-100
10
100
Frequency (Hz)
1K
10K
100K
-100
0
200
I
LOAD
(mA)
400
600
800
1.2
1.0
Dropout Voltage (V
IN
-V
OUT
)
Short Circuit Current (A)
T
J
= 25°C
T
J
= 125°C
2.5
Short-Circuit Current
Dropout Voltage (V)
2.0
T
J
= 125°C
0.8
0.6
0.4
0.2
0.0
0
1.5
T
J
= 25°C
1.0
0.5
0.0
200
400
600
800
0
2.5
5
7.5
10
Output Current (mA)
Input/Output Differential (V)
DS9164-08 May 2001
www.richtek-ic.com.tw
5
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