RT9183
Ultra Low Dropout 1.5A Linear Regulator
General Description
The RT9183 series are high performance linear voltage
regulators that provide ultra low-dropout voltage, high output
current with low ground current. It operates from an input
of 2.3V to 5.5V and provides output current up to 1.5A
thus is suitable to drive digital circuits requiring low voltage
at high currents.
The RT9183 has superior regulation over variations in line
and load. Also it provides fast respond to step changes in
load. Other features include over-current and over-
temperature protection. The adjustable version has enable
pin to reduce power consumption in shutdown mode.
The devices are available in fixed output voltages
of 1.2V,
1.8V, 2.5V, 3.3V and as an adjustable device with a 0.8V
reference voltage. The RT9183 regulators are available in
3-lead SOT-223 and TO-263 packages (fixed output only
for the 3-lead option). Also available are 5-lead TO-263
and fused SOP-8 packages with two external resistors to
set the output voltage ranges from 0.8V to 4.5V.
Features
330mV Dropout @ 1.5A
380μA Low Ground Pin Current
μ
Excellent Line and Load Regulation
0.1μA Quiescent Current in Shutdown Mode
μ
Guaranteed 1.5A Output Current
Fixed Output Voltages : 1.2V, 1.8V, 2.5V, 3.3V
Adjustable Output Voltage from 0.8V to 4.5V
Over-Temperature/Over-Current Protection
RoHS Compliant and 100% Lead (Pb)-Free
Applications
Battery-Powered Equipment
Mother Board/Graphic Card
Peripheral Cards
PCMCIA Card
Pin Configurations
(TOP VIEW)
Ordering Information
RT9183
-
Package Type
G : SOT-223
GF : SOT-223 (F-Type)
S : SOP-8
M : TO-263
M5 : TO-263-5
Operating Temperature Range
P : Pb Free with Commercial Standard
G : Green (Halogen Free with Commer-
cial Standard)
Output Voltage
Defauit : Adjustable
12 : 1.2V
18 : 1.8V
25 : 2.5V
33 : 3.3V
H : Chip Enable High
L : Chip Enable Low
1
2
3
1
2
3
VIN
GND
(TAB)
VOUT
GND
VOUT
(TAB)
VIN
SOT-223
SOT-223 (F-Type)
1
2
3
1
2
3
4
5
VIN
VOUT
GND(TAB)
EN VIN
VOUT ADJ
GND(TAB)
TO-263
EN
VIN
VOUT
ADJ
2
3
4
8
7
6
5
TO-263-5
Note :
RichTek Pb-free and Green 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.
100%matte tin (Sn) plating.
DS9183-12 March 2007
SOP-8
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GND
GND
GND
GND
RT9183
Typical Application Circuit
(SOT-223 & TO-263)
V
IN
= 3.3V
C
IN
10uF
RT9183
VIN
VOUT
GND
C
OUT
10uF
V
OUT
2.5V, 1.5A
Figure 1. 3.3V to 2.5V Regulator
(SOP-8 & TO-263-5)
V
IN
Enable
C
0.1uF
VIN
EN
RT9183
VOUT
R
1
C
IN
10uF
GND
ADJ
R
2
V
OUT
C
OUT
10uF
V
OUT
=
0.8
×
(1
+
R1
)Volts
R2
Note: The value of R2 should be less
than 80k to maintain
regulation.
Figure 2. Adjustable Operation
(SOP-8 & TO-263-5)
V
IN
Enable
C
0.1uF
C
IN
10uF
RT9183
VIN
VOUT
EN
GND ADJ
C
OUT
10uF
V
OUT
Figure 3. Fixed Operation with SOP-8 and TO-263-5 packages
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DS9183-12 March 2007
RT9183
Functional Pin Description
Pin Name
EN
VIN
GND
VOUT
ADJ
Chip Enable Control Input.
Note that the device will be in the unstable state if the pin is not connected.
Supply Input
Common Ground
Regulator Output
The output voltage is set by the internal feedback resistors when this pin
grounded. If external feedback resistors are applied, the output voltage will be:
V
OUT
= 0.8
×
(1 +
R
1
) Volts
R
2
Pin Function
Function Block Diagram
VIN
Current Limit
Sensor
+
0.8V
Reference
Error
Amplifier
-
-
+
VOUT
EN
Shutdown
Logic
Thermal
Shutdown
ADJ
-
Output Mode
Comparator
DS9183-12 March 2007
+
100mV
GND
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RT9183
Absolute Maximum Ratings
(Note 1)
6V
115°C/W
15°C/W
135°C/W
17°C/W
125°C/W
Supply Input Voltage ------------------------------------------------------------------------------------------------------
Package Thermal Resistance
SOT-223,
θ
JA
----------------------------------------------------------------------------------------------------------------
SOT-223,
θ
JC
---------------------------------------------------------------------------------------------------------------
SOT-223 (F-Type),
θ
JA
----------------------------------------------------------------------------------------------------
SOT-223 (F-Type),
θ
JC
----------------------------------------------------------------------------------------------------
SOP-8,
θ
JA
------------------------------------------------------------------------------------------------------------------
SOP-8,
θ
JC
------------------------------------------------------------------------------------------------------------------ 20°C/W
TO-263,
θ
JA
----------------------------------------------------------------------------------------------------------------- 45°C/W
TO-263,
θ
JC
----------------------------------------------------------------------------------------------------------------- 8°C/W
Power Dissipation, P
D
@T
A
= 25°C
SOT-223 --------------------------------------------------------------------------------------------------------------------- 0.87W
SOT-223 (F-Type) ---------------------------------------------------------------------------------------------------------- 0.74W
SOP-8 ------------------------------------------------------------------------------------------------------------------------ 0.8W
TO-263 ----------------------------------------------------------------------------------------------------------------------- 2.22W
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
Junction Temperature -----------------------------------------------------------------------------------------------------
Storage Temperature Range --------------------------------------------------------------------------------------------
ESD Susceptibility (Note 2)
HBM (Human Body Mode) ----------------------------------------------------------------------------------------------
MM (Machine Mode) ------------------------------------------------------------------------------------------------------
150°C
−
65°C to 150°C
2kV
200V
Recommended Operating Conditions
(Note 3)
Supply Input Voltage ------------------------------------------------------------------------------------------------------ 2.3V to 5.5V
Junction Temperature Range --------------------------------------------------------------------------------------------
−
40°C to 125°C
Electrical Characteristics
(V
IN
= V
OUT
+ 0.7V, C
IN
=C
OUT
= 10μF (Ceramic), T
A
= 25°C unless otherwise specified)
Parameter
Output Voltage Accuracy
(Fixed Output Voltage)
Output Voltage Range (Adjustable)
Quiescent Current
Standby Current
Current Limit
(Note 6)
(Note 7)
Symbol
ΔV
OUT
V
OUT_ADJ
I
Q
I
STBY
I
LIM
Test Conditions
I
OUT
= 10mA
Min
−2
0.8
Typ
0
--
380
0.1
3.2
110
220
330
0.035
Max
+2
4.5
500
1
4.2
300
400
500
0.18
Units
%
V
μA
μA
A
I
OUT
= 0mA, Enable
V
IN
= 5.5V, Shutdown
--
--
2
I
OUT
= 0.5A
Dropout Voltage
(Note 4)
V
DROP
I
OUT
= 1.0A
I
OUT
= 1.5A
Line Regulation
ΔV
LINE
V
OUT
+ 0.7V
<
V
IN
<
5.5V
I
OUT
= 10mA
--
--
--
--
mV
%/V
To be continued
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DS9183-12 March 2007
RT9183
Parameter
Load Regulation
(Note 5)
Symbol
ΔV
LOAD
T
SD
ΔT
SD
V
IL
V
IH
I
EN
V
IN
= 5.5V
V
IN
= 5.5V
V
IN
= 5.5V, Enable
Test Conditions
1mA < I
OUT
< 1.5A
Min
--
--
--
--
1.8
--
Typ
22
170
30
--
--
0.1
Max
45
--
--
0.6
--
1
μA
Units
mV
°C
°C
V
(Fixed Output Voltage)
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
EN Threshold
Logic-Low Voltage
Logic-High Voltage
Enable Pin Current
ADJ
Reference Voltage Tolerance
Adjust Pin Current
Adjust Pin Threshold
V
REF
I
ADJ
V
TH(ADJ)
V
ADJ
=
V
REF
0.784
--
0.05
0.8
10
0.1
0.816
100
0.2
V
nA
V
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.
Devices are ESD sensitive. Handling precaution recommended.
Note 3.
The device is not guaranteed to function outside its operating conditions.
Note 4.
The dropout voltage is defined as V
IN
-V
OUT
, which is measured when V
OUT
is V
OUT(NORMAL)
−
100mV.
Note 5.
Regulation is measured at constant junction temperature by using a 20ms current pulse. Devices are tested for
load regulation in the load range from 10mA to 1.5A.
Note 6.
Quiescent, or ground current, is the difference between input and output currents. It is defined by I
Q
= I
IN
- I
OUT
under no load condition (I
OUT
= 0mA). The total current drawn from the supply is the sum of the load current plus
the ground pin current.
Note 7.
Standby current is the input current drawn by a regulator when the output voltage is disabled by a shutdown
signal (V
EN
>1.8V ). It is measured with V
IN
= 5.5V.
Note 8.
θ
JA
is measured in natural convection (still air) at T
A
= 25°C with the component mounted on a low effective
thermal conductivity test board of JEDEC 51-3 thermal measurement standard. And the cooper area of PCB
layout is 4mm x 2.5mm on SOT-223, 14mm x 14mm on TO-263 for thermal measurement.
DS9183-12 March 2007
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