®
RT9079
36V, 50μA I
Q
, Peak 200mA Low Dropout Voltage Linear
μ
Regulator
General Description
The RT9079 is a low-dropout (LDO) voltage regulators with
enable function offering the benefits of high input voltage,
low-dropout voltage, low-power consumption, and
miniaturized packaging.
The features of low quiescent current and almost zero
disable current is ideal for powering the battery equipment
to a longer service life. The RT9079 is stable with the
ceramic output capacitor over its wide input range from
3.5V to 36V and the entire range of output load current.
Features
50μA Ground Current at no Load
μ
Maximum Operating Input Voltage 36V
±
2% Output Accuracy
100mA Continuous Output Current
Less than 0.1μA Disable Current
μ
Dropout Voltage : 0.2V at 10mA
Support Fixed Output Voltage 2.5V, 3V, 3.3V, 5V,
6V, 9V, 12V
Stable with Ceramic or Tantalum Capacitor
Current Limit Protection
Over-Temperature Protection
RoHS Compliant and Halogen Free
Applications
Portable, Battery Powered Equipments
Extra Low Voltage Microcontrollers
Notebook Computers
Ordering Information
RT9079-
Package Type
J5 : TSOT-23-5
Lead Plating System
G : Green (Halogen Free and Pb Free)
Output Voltage
25 : 2.5V
30 : 3V
33 : 3.3V
50 : 5V
60 : 6V
90: 9V
C0: 12V
Pin Configuration
(TOP VIEW)
VOUT
5
2
EN
4
3
VCC GND NC
TSOT-23-5
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Note :
½
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
½
Suitable for use in SnPb or Pb-free soldering processes.
Simplified Application Circuit
RT9079
EN
V
CC
C
IN
GND
EN
VOUT
VCC
C
OUT
VOUT
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9079-03 March 2019
www.richtek.com
1
RT9079
Pin Description
Pin No.
1
2
3
4
5
Pin Name
VCC
GND
NC
EN
VOUT
Supply voltage input.
Ground.
No internal connection.
Enable control input.
Output of the regulator.
Pin Function
Functional Block Diagram
VCC
VOUT
Current/Thermal
Sense
-
R1
+
EN
GND
Bandgap
Reference
R2
Operation
Basic Operation
The RT9079 is a high input voltage linear regulator designed
especially for low external
component systems. The input
voltage range is from 3.5V to 36V.
The minimum required output capacitance for stable
operation is 1μF effective capacitance after consideration
of the temperature and voltage coefficient of the capacitor.
Output Transistor
The RT9079 builds in a P-MOSFET output transistor which
provides a low switch-on resistance for low dropout voltage
applications.
Error Amplifier
The Error Amplifier compares the internal reference
voltage
with the output feedback voltage from the internal divider,
and controls the Gate voltage of P-MOSFET to support
good line regulation and load regulation at output voltage.
Enable
The RT9079 delivers the output power when it is set to
enable state. When it works in disable state, there is no
output power and the operation quiescent current is almost
zero.
Current Limit Protection
The RT9079 provides current limit function to prevent the
device from damages during over-load or shorted-circuit
conditions. This current is detected by an internal sensing
transistor.
Over-Temperature Protection
The over-temperature protection function turns off the P-
MOSFET when the junction temperature exceeds 150°C
(typ.) and the output current exceeds 4mA. Once the
junction temperature cools down by approximately 20°C,
the regulator automatically resumes operation.
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9079-03 March 2019
RT9079
Absolute Maximum Ratings
(Note 1)
−0.3V
to 40V
−40V
to 0.3V
−0.3V
to 15V
−0.3V
to 6V
0.43W
VCC, EN to GND ------------------------------------------------------------------------------------------------------------
VOUT to VCC ---------------------------------------------------------------------------------------------------------------
VOUT to GND
RT9079-60, RT9079-90/RT9079-C0 ------------------------------------------------------------------------------------
RT9079-25/RT9079-30/RT9079-33/RT9079-50 ----------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
TSOT-23-5 --------------------------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 2)
TSOT-23-5,
θ
JA
-------------------------------------------------------------------------------------------------------------- 230.6°C/W
Junction Temperature ------------------------------------------------------------------------------------------------------ 150°C
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------- 260°C
Storage Temperature Range ---------------------------------------------------------------------------------------------
−60°C
to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ----------------------------------------------------------------------------------------------- 2kV
(Note 4)
Recommended Operating Conditions
Supply Input Voltage ------------------------------------------------------------------------------------------------------- 3.5V to 36V
Junction Temperature Range ---------------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range ---------------------------------------------------------------------------------------------
−40°C
to 85°C
Electrical Characteristics
(C
IN
= 1μF, T
A
= 25°C, unless otherwise specified)
Parameter
Supply Voltage
Output Voltage Range
DC Output Accuracy
Dropout Voltage
VCC Consumption Current
Shutdown Current
Shutdown Leakage Current
EN Input Current
Symbol
V
CC
V
OUT
V
OUT
V
DROP
I
Q
Test Conditions
Min
3.5
2.5
Typ
--
--
--
0.2
50
0.1
0.1
0.1
0.04
0.04
--
350
--
--
150
20
Max
36
12
2
0.36
100
0.5
0.5
--
0.5
Unit
V
V
%
V
A
A
A
A
I
LOAD
= 10mA
I
LOAD
= 10mA, V
CC
> 5V
I
LOAD
= 0mA, V
CC
= 15V
V
EN
= 0V
V
EN
= 0V, V
OUT
= 0V
2
--
--
--
--
--
--
--
1
200
--
0.6
I
EN
V
LINE
V
EN
= 36V
I
LOAD
=
1mA,
Line Regulation
V
OUT
+1 < V
CC
< 36V, V
OUT
3.3V
I
LOAD
=
1mA,
%
0.6
1
--
2
--
--
--
%
mA
V
°C
°C
V
OUT
+1 < V
CC
< 36V, V
OUT
3.3V
Load Regulation
Output Current Limit
Enable Input
Voltage
Logic-High
Logic-Low
V
LOAD
I
LIM
V
IH
V
IL
T
SD
T
SD
I
LOAD
= 30mA
0mA < I
LOAD
< 100mA
V
OUT
= 0.5 x V
OUT(normal)
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
--
--
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9079-03 March 2019
www.richtek.com
3
RT9079
Note 1.
Stresses beyond those listed under
“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 at T
A
= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7.
Note 3.
Devices are ESD sensitive. Handling precaution is recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
Typical Application Circuit
RT9079
EN
V
CC
3.5V to 36V
C
IN
1µF
EN
VOUT
VCC
GND
V
OUT
C
OUT
(Effective Capacitance
1µF)
Note 1 : All the input and output capacitances are the suggested values, which refer to the effective capacitances, and
are subject to any de-rating effect, like a DC bias.
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9079-03 March 2019
RT9079
Typical Operating Characteristics
Output Voltage vs. Temperature
2.60
2.58
2.56
Output Voltage vs. Output Current
2.52
2.50
Output Voltage (V)
2.54
2.52
2.50
2.48
2.46
2.44
2.42
2.40
-50
-25
0
25
50
75
Output Voltage (V)
2.48
V
CC
= 36V
V
CC
= 24V
V
CC
= 12V
V
CC
V
CC
V
CC
V
CC
= 12V, I
LOAD
=
= 12V, I
LOAD
=
= 36V, I
LOAD
=
= 36V, I
LOAD
=
0.1mA
20mA
0.1mA
20mA
V
OUT
= 2.5V
100
125
2.46
2.44
V
OUT
= 2.5V
2.42
0
25
50
75
100
125
150
Temperature (°C)
Output Current (mA)
Output Voltage vs. Supply Voltage
2.60
70
67
Quiescent Current vs. Input Voltage
Quiescent Current (μA)
Output Voltage (V)
2.55
I
LOAD
=
I
LOAD
=
I
LOAD
=
I
LOAD
=
0mA
0.1mA
10mA
20mA
64
61
58
55
52
49
46
43
40
3
6
9
12
15
18
21
24
27
30
33
36
2.50
2.45
2.40
3
6
9
12
V
CC
= 3.5V to 36V, V
OUT
= 2.5V
15
18
21
24
27
30
33
36
V
OUT
= 2.5V, I
LOAD
= 10mA
Supply Voltage (V)
Input Voltage (V)
Quiescent Current vs. Temperature
80
SHDN Input Leakage Current vs. V
CC
100
SHDN Leakage Current (nA)1
70
Quiescent Current (μA)
60
50
40
30
20
10
80
60
40
20
V
CC
= 4V, V
OUT
= 2.5V,
I
LOAD
= 10mA
0
-50
-25
0
25
50
75
100
125
0
3
6
9
12
15
18
21
24
27
EN = 0V
30
33
36
Temperature (°C)
Supply Voltage (V)
is a registered trademark of Richtek Technology Corporation.
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
DS9079-03 March 2019
www.richtek.com
5
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