®
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
to 3.3V with 0.1V per step 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, TO-252 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 to 3.3V
Adjustable Output Voltage from 0.8V to 4.5V
Over-Temperature/Over-Current Protection
RoHS Compliant and 100% Lead (Pb)-Free
Ordering Information
RT9183
-
Package Type
G : SOT-223
GF : SOT-223 (F-Type)
S : SOP-8
L: TO-252
LF : TO-252 (F-Type)
M : TO-263
M5 : TO-263-5
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Output Voltage
Defauit : Adjustable
12 : 1.2V
13 : 1.3V
:
32 : 3.2V
33 : 3.3V
Only for SOP-8 and TO-263-5
H : Chip Enable High
L : Chip Enable Low
Note :
Richtek products are :
½
Applications
Battery-Powered Equipment
Mother Board/Graphic Card
Peripheral Cards
PCMCIA Card
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
RoHS compliant and compatible with the current
ments of IPC/JEDEC J-STD-020.
require-
½
Suitable for use in SnPb or Pb-free soldering
processes.
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9183-21
October 2015
www.richtek.com
1
RT9183
Pin Configurations
(TOP VIEW)
1
2
3
1
2
3
1
2
3
1
2
3
VIN
GND
(TAB)
VOUT
GND
VOUT
(TAB)
VIN
GND
(TAB)
VIN
VOUT
VOUT
(TAB)
GND
VIN
SOT-223
SOT-223 (F-Type)
TO-252
TO-252 (F-Type)
EN
VIN
VOUT
ADJ
2
3
4
8
7
6
5
GND
GND
GND
GND
1
2
3
1
2
3
4
5
SOP-8
VIN
VOUT
GND(TAB)
EN VIN
VOUT ADJ
GND(TAB)
TO-263
TO-263-5
Typical Application Circuit
(SOT-223 & TO-263 & TO-252)
V
IN
= 3.3V
C
IN
10µF
RT9183
VIN
VOUT
GND
C
OUT
10µF
V
OUT
2.5V, 1.5A
Figure 1. 3.3V to 2.5V Regulator
(SOP-8 & TO-263-5)
V
IN
Enable
C
0.1µF
RT9183
VIN
VOUT
R
1
C
IN
10µF
EN
GND
ADJ
R
2
C
OUT
10µF
V
OUT
V
OUT
½
0.8
(1
R1
)Volts
R2
Note: The value of R2 should be less
than 80k to maintain
regulation.
Figure 2. Adjustable Operation
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9183-21
October 2015
RT9183
(SOP-8 & TO-263-5)
V
IN
Enable
C
0.1µF
C
IN
10µF
RT9183
VIN
VOUT
EN
GND ADJ
C
OUT
10µF
V
OUT
Figure 3. Fixed Operation with SOP-8 and TO-263-5 packages
Functional Pin Description
Pin Name
EN
VIN
GND
VOUT
ADJ
Pin Function
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
Function Block Diagram
VIN
Current Limit
Sensor
+
0.8V
Reference
Error
Amplifier
-
-
+
VOUT
EN
Shutdown
Logic
Thermal
Shutdown
ADJ
-
Output Mode
Comparator
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
DS9183-21
October 2015
+
100mV
GND
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
3
RT9183
Absolute Maximum Ratings
(Note 1)
7V
115°C/W
15°C/W
135°C/W
17°C/W
125°C/W
Supply Input Voltage ------------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 2)
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-252,
θ
JA
----------------------------------------------------------------------------------------------------------------- 68°C/W
TO-252,
θ
JC
----------------------------------------------------------------------------------------------------------------- 8°C/W
TO-252 (F-Type),
θ
JA
------------------------------------------------------------------------------------------------------ 75°C/W
TO-252 (F-Type),
θ
JC
------------------------------------------------------------------------------------------------------ 15°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) ----------------------------------------------------------------------------------------------------------
SOP-8 ------------------------------------------------------------------------------------------------------------------------
TO-252 -----------------------------------------------------------------------------------------------------------------------
TO-252 (F-Type) -----------------------------------------------------------------------------------------------------------
TO-263 -----------------------------------------------------------------------------------------------------------------------
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------
Junction Temperature -----------------------------------------------------------------------------------------------------
Storage Temperature Range --------------------------------------------------------------------------------------------
ESD Susceptibility (Note 3)
HBM (Human Body Mode) ----------------------------------------------------------------------------------------------
MM (Machine Mode) ------------------------------------------------------------------------------------------------------
(Note 4)
0.74W
0.8W
1.471W
1.333W
2.22W
260°C
150°C
−65°C
to 150°C
2kV
200V
Recommended Operating Conditions
Supply Input Voltage ------------------------------------------------------------------------------------------------------ 2.3V to 5.5V
Junction Temperature Range --------------------------------------------------------------------------------------------
−
40°C to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------------
−
40°C to 85°C
Electrical Characteristics
Parameter
Output Voltage Accuracy
(Fixed Output Voltage)
Output Voltage Range (Adjustable)
Quiescent Current
Standby Current
(Note 5)
(Note 6)
(V
IN
= V
OUT
+ 0.7V, C
IN
= C
OUT
= 10μF (Ceramic), T
A
= 25°C unless otherwise specified)
Symbol
V
OUT
V
OUT_ADJ
I
Q
I
STBY
Test Conditions
I
OUT
= 10mA
Min
2
0.8
Typ
0
--
380
0.1
Max
2
4.5
500
1
Unit
%
V
A
A
I
OUT
= 0mA, Enable
V
IN
= 5.5V, Shutdown
--
--
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9183-21
October 2015
RT9183
Parameter
Current Limit
Dropout Voltage
(Note 7)
Symbol
I
LIM
I
OUT
= 0.5A
V
DROP
I
OUT
= 1.0A
I
OUT
= 1.5A
Line Regulation
Load Regulation
(Note 8)
(Fixed Output Voltage)
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Logic-Low
EN Threshold Voltage
Logic-High
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
V
LINE
V
LOAD
T
SD
T
SD
V
IL
V
IH
I
EN
V
IN
= 5.5V
V
IN
= 5.5V
(Note 9)
V
OUT
+ 0.7V
V
IN
5.5V
I
OUT
= 10mA
1mA < I
OUT
< 1.5A
Test Conditions
Min
2
--
--
--
--
Typ
3.2
110
220
330
0.035
Max
4.2
300
400
500
0.18
%/V
mV
Unit
A
--
--
--
--
1.2
--
22
170
30
--
--
0.1
45
--
--
0.6
mV
C
C
V
--
1
A
V
IN
= 5.5V, Enable
Note 1.
Stresses beyond those listed
“Absolute
Maximum Ratings” may cause permanent damage to the device.
These are stress ratings only, and 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 may affect device reliability.
Note 2.
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 copper area of PCB
layout is 4mm x 2.5mm on SOT-223, 10mm x 10mm on TO-252, 14mm x 14mm on TO-263 for thermal
measurement.
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.
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 6.
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 7.
The dropout voltage is defined as V
IN
−
V
OUT
, which is measured when V
OUT
is V
OUT(NORMAL)
−
100mV.
Note 8.
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 9.
The EN threshold should be higher than V
IH
for turning on.
Copyright
©
2015 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9183-21
October 2015
www.richtek.com
5
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