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RT9079
36V, 50μ
μA IQ, 200mA Low Dropout Voltage Linear Regulator
General Description
Features
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.
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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
(0mA to 200mA).
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Applications
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Portable, Battery Powered Equipments
Extra Low Voltage Microcontrollers
Notebook Computers
50μ
μA Ground Current at no Load
Maximum Operating Input Voltage 36V
±2% Output Accuracy
200mA Output Current with EN
Less than 0.1μ
μA Disable Current
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
Ordering Information
RT9079Package Type
J5 : TSOT-23-5
Pin Configurations
Lead Plating System
G : Green (Halogen Free and Pb Free)
(TOP VIEW)
VOUT
EN
5
4
2
Output Voltage
25 : 2.5V
30 : 3V
33 : 3.3V
50 : 5V
3
VCC GND NC
60 : 6V
90: 9V
C0: 12V
TSOT-23-5
Marking Information
Note :
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Richtek products are :

RoHS compliant and compatible with the current requirements of IPC/JEDEC J-STD-020.

Suitable for use in SnPb or Pb-free soldering processes.
Simplified Application Circuit
RT9079
EN
EN
VOUT
VOUT
VCC
VCC
COUT
CIN
GND
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9079-02 February 2016
is a registered trademark of Richtek Technology Corporation.
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1
RT9079
Pin Description
Pin No.
Pin Name
Pin Function
1
VCC
Supply Voltage Input.
2
GND
Ground.
3
NC
No Internal Connection.
4
EN
Enable Control Input.
5
VOUT
Output of the Regulator.
Function Block Diagram
VOUT
VCC
Current/Thermal
Sense
EN
Bandgap
Reference
+
-
R1
R2
GND
Operation
Basic Operation
Enable
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 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.
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.
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
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2
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 PMOSFET 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.
is a registered trademark of Richtek Technology Corporation.
DS9079-02 February 2016
RT9079
Absolute Maximum Ratings
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(Note 1)
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, PD @ TA = 25°C
TSOT-23-5 -------------------------------------------------------------------------------------------------------------------Package Thermal Resistance (Note 2)
TSOT-23-5, θJA -------------------------------------------------------------------------------------------------------------Junction Temperature -----------------------------------------------------------------------------------------------------Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------Storage Temperature Range --------------------------------------------------------------------------------------------ESD Susceptibility (Note 3)
HBM (Human Body Model) -----------------------------------------------------------------------------------------------
Recommended Operating Conditions
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−0.3V to 40V
−40V to 0.3V
−0.3V to 15V
−0.3V to 6V
0.43W
230.6°C/W
150°C
260°C
−60°C to 150°C
2kV
(Note 4)
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
(VCC = 5V, CIN = 1μF, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Supply Voltage
VCC
3.5
--
36
V
Output Voltage Range
VOUT
2.5
--
12
V
DC Output Accuracy
VOUT
ILOAD = 10mA
2
--
2
%
Dropout Voltage
VDROP
ILOAD = 10mA, VCC > 5V
--
0.2
0.36
V
VCC Consumption Current
IQ
ILOAD = 10mA, VCC = 15V
--
50
100
A
Shutdown Current
VEN = 0V
--
0.1
0.5
A
Shutdown Leakage Current
VEN = 0V, VOUT = 0V
--
0.1
0.5
A
VEN = 36V
--
0.1
--
A
--
0.04
0.5
EN Input Current
IEN
ILOAD = 1mA,
VLINE
Line Regulation
VOUT +1 < VCC < 36V, VOUT  3.3V
ILOAD = 1mA,
%
VOUT +1 < VCC < 36V, VOUT  3.3V
--
0.04
0.6
Load Regulation
VLOAD
0mA < ILOAD < 100mA
1
--
1
%
Output Current Limit
ILIM
VOUT = 0.5 x VOUT(normal)
200
350
--
mA
Enable Input
Voltage
Logic-High
VIH
--
--
2
Logic-Low
VIL
0.6
--
--
--
150
--
°C
--
20
--
°C
Thermal Shutdown Temperature
TSD
Thermal Shutdown Hysteresis
TSD
ILOAD = 30mA
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9079-02 February 2016
V
is a registered trademark of Richtek Technology Corporation.
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RT9079
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. θJA is measured at TA = 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
VCC
3.5V to 36V
EN
VOUT
CIN
1µF
VCC
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
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VOUT
COUT
(Effective Capacitance
 1µF)
GND
is a registered trademark of Richtek Technology Corporation.
DS9079-02 February 2016
RT9079
Typical Operating Characteristics
Output Voltage vs. Temperature
Output Voltage vs. Output Current
2.60
2.52
2.58
2.50
Output Voltage (V)
Output Voltage (V)
2.56
2.54
2.52
2.50
2.48
VCC
VCC
VCC
VCC
2.46
2.44
= 12V, ILOAD =
= 12V, ILOAD =
= 36V, ILOAD =
= 36V, ILOAD =
0.1mA
20mA
0.1mA
20mA
0
25
VCC = 12V
VCC = 24V
2.46
VOUT = 2.5V
VOUT = 2.5V
2.40
-25
VCC = 36V
2.44
2.42
-50
2.48
50
75
100
2.42
0
125
25
Temperature (°C)
50
75
100
125
150
Output Current (mA)
Output Voltage vs. Supply Voltage
Quiescent Current vs. Input Voltage
70
2.60
ILOAD =
ILOAD =
ILOAD =
ILOAD =
2.55
Quiescent Current (μA)
Output Voltage (V)
67
0mA
0.1mA
10mA
20mA
2.50
2.45
3
6
9
12
15
18
21
24
27
30
33
61
58
55
52
49
46
43
VCC = 3.5V to 36V, VOUT = 2.5V
2.40
64
VOUT = 2.5V, ILOAD = 10mA
40
3
36
6
9
12
18
21
24
27
30
33
36
Input Voltage (V)
Supply Voltage (V)
Quiescent Current vs. Temperature
SHDN Input Leakage Current vs. VCC
80
60
50
40
30
20
10
VCC = 4V, VOUT = 2.5V, ILOAD = 10mA
0
SHDN Leakage Current (nA)1
100
70
Quiescent Current (μA)
15
80
60
40
20
EN = 0V
0
-50
-25
0
25
50
75
100
Temperature (°C)
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9079-02 February 2016
125
3
6
9
12
15
18
21
24
27
30
33
36
Supply Voltage (V)
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RT9079
SHDN Input Leakage Current vs. Temperature
EN Voltage vs. Supply Voltage
2.0
1.4
1.2
EN Voltage (V)
SHDN Leakage Current (μA)1
1.6
1.0
0.8
0.6
VCC = 36V
0.4
1.5
High Threshold
1.0
Low Threshold
0.5
VCC = 3.5V
0.2
0.0
0.0
-50
-25
0
25
50
75
100
125
3
6
9
12
18
21
24
27
EN Voltage vs. Temperature
33
36
Dropout Voltage vs. Temperature
0.5
1.5
Dropout Voltage (V)
2.0
High Threshold
1.0
Low Threshold
0.5
0.4
0.3
0.2
0.1
VCC = 36V
ILOAD = 10mA
0
0.0
-50
-25
0
25
50
75
100
-50
125
-25
0
25
50
75
100
125
Temperature (°C)
Temperature (°C)
Current Limit vs. Temperature
PSRR vs. Frequency
350
0
300
VCC = 12V
VOUT = 2.5V, ILOAD = 50mA
-20
250
VCC = 36V
200
150
PSRR (dB)
Current Limit (mA)
30
Supply Voltage (V)
Temperature (°C)
EN Voltage (V)
15
VCC = 5V
-40
-60
VCC = 12V
100
-80
50
VOUT = 2.5V
0
-50
-25
0
25
50
75
100
Temperature (°C)
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
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6
125
-100
10
100
1000
10000
100000
1000000
Frequency (Hz )
is a registered trademark of Richtek Technology Corporation.
DS9079-02 February 2016
RT9079
Load Transient Response
Load Transient Response
VOUT_ac
(50mV/Div)
VOUT_ac
(50mV/Div)
I LOAD
(50mA/Div)
I LOAD
(50mA/Div)
VCC = 12V, VOUT = 2.5V, ILOAD = 10mA to 100mA
VCC = 24V, VOUT = 2.5V, ILOAD = 10mA to 100mA
Time (250μs/Div)
Time (250μs/Div)
Load Transient Response
Load Transient Response
VOUT_ac
(100mV/Div)
VOUT_ac
(100mV/Div)
I LOAD
(100mA/Div)
I LOAD
(50mA/Div)
VCC = 12V, VOUT = 2.5V, ILOAD = 10mA to 200mA
VCC = 12V, VOUT = 2.5V, ILOAD = 10mA to 100mA
Time (250μs/Div)
Time (10μs/Div)
Line Transient Response
Line Transient Response
VOUT_ac
(20mV/Div)
VOUT_ac
(20mV/Div)
V CC
(5V/Div)
V CC
(10V/Div)
VCC = 4.4V to 15V, VOUT = 2.5V, ILOAD = 100mA
Time (100μs/Div)
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9079-02 February 2016
VCC = 3.5V to 36V, VOUT = 2.5V, ILOAD = 100mA
Time (100μs/Div)
is a registered trademark of Richtek Technology Corporation.
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RT9079
Power On from EN
V CC
(10V/Div)
Power Off from EN
EN
(2V/Div)
V CC
(10V/Div)
EN
(2V/Div)
VOUT
(1V/Div)
VOUT
(1V/Div)
I LOAD
(50mA/Div)
VCC = 24V, VOUT = 2.5V, ILOAD = 100mA
Time (100μs/Div)
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I LOAD
(50mA/Div)
VCC = 24V, VOUT = 2.5V, ILOAD = 100mA
Time (25μs/Div)
is a registered trademark of Richtek Technology Corporation.
DS9079-02 February 2016
RT9079
Applications Information
For continuous operation, do not exceed absolute
maximum junction temperature. The maximum power
dissipation depends on the thermal resistance of the IC
package, PCB layout, rate of surrounding airflow, and
difference between junction and ambient temperature. The
maximum power dissipation can be calculated by the
following formula :
PD(MAX) = (TJ(MAX) − TA) / θJA
where TJ(MAX) is the maximum junction temperature, TA is
the ambient temperature, and θJA is the junction to ambient
thermal resistance.
For recommended operating condition specifications, the
maximum junction temperature is 125°C. The junction to
ambient thermal resistance, θJA, is layout dependent. For
TSOT-23-5 package, the thermal resistance, θJA, is
230.6°C/W on a standard JEDEC 51-7 four-layer thermal
test board. The maximum power dissipation at TA = 25°C
can be calculated by the following formula :
1.0
Maximum Power Dissipation (W)1
Thermal Considerations
Four-Layer PCB
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0
25
50
75
100
125
Ambient Temperature (°C)
Figure 1. Derating Curve of Maximum Power Dissipation
PD(MAX) = (125°C − 25°C) / (230.6°C/W) = 0.43W for
TSOT-23-5 package
The maximum power dissipation depends on the operating
ambient temperature for fixed T J(MAX) and thermal
resistance, θJA. The derating curve in Figure 1 allows the
designer to see the effect of rising ambient temperature
on the maximum power dissipation.
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9079-02 February 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
9
RT9079
Outline Dimension
H
D
L
B
C
b
A
A1
e
Symbol
Dimensions In Millimeters
Dimensions In Inches
Min
Max
Min
Max
A
0.700
1.000
0.028
0.039
A1
0.000
0.100
0.000
0.004
B
1.397
1.803
0.055
0.071
b
0.300
0.559
0.012
0.022
C
2.591
3.000
0.102
0.118
D
2.692
3.099
0.106
0.122
e
0.838
1.041
0.033
0.041
H
0.080
0.254
0.003
0.010
L
0.300
0.610
0.012
0.024
TSOT-23-5 Surface Mount Package
Richtek Technology Corporation
14F, No. 8, Tai Yuen 1st Street, Chupei City
Hsinchu, Taiwan, R.O.C.
Tel: (8863)5526789
Richtek products are sold by description only. Richtek reserves the right to change the circuitry and/or specifications without notice at any time. Customers should
obtain the latest relevant information and data sheets before placing orders and should verify that such information is current and complete. Richtek cannot
assume responsibility for use of any circuitry other than circuitry entirely embodied in a Richtek product. Information furnished by Richtek is believed to be
accurate and reliable. However, no responsibility is assumed by Richtek or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Richtek or its subsidiaries.
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DS9079-02 February 2016