RT9077

®
RT9077
Low Power, 14V, 200mA LDO Regulator
General Description
Features
The RT9077 is a low-dropout (LDO) voltage regulator with
enable function offering benefits of up to 14V input voltage,
low-dropout, low-power operation, 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 RT9077 is stable with ceramic
output capacitors over its wide input range from 3.5V to
14V and entire range of output load current (0mA to 200mA).
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Applications
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Portable, Battery Powered Equipments
Ultra Low Voltage Microcontrollers
Notebook Computers
Maximum Operating Input Voltage 14V
±2% Output Accuracy
200mA Output Current with EN
μA Zero Disable Current
Less than 0.1μ
Dropout Voltage : 0.4V at 100mA
Support Fixed Output Voltage 2.5V, 3.3V, 4.2V, 5V,
8V, 9V
Stable with Ceramic or Tantalum Capacitor
Current Limit Protection
Over-Temperature Protection
RoHS Compliant and Halogen Free
Ordering Information
RT9077-
Package Type
J5 : TSOT-23-5
Pin Configurations
Lead Plating System
G : Green (Halogen Free and Pb Free)
(TOP VIEW)
VOUT
NC
5
4
2
Output Voltage
25 : 2.5V
33 : 3.3V
42 : 4.2V
50 : 5V
80 : 8V
3
VCC GND EN
90 : 9V
TSOT-23-5
Note :
Marking Information
Richtek products are :
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.

RoHS compliant and compatible with the current require-

Suitable for use in SnPb or Pb-free soldering processes.
ments of IPC/JEDEC J-STD-020.
Simplified Application Circuit
RT9077
EN
EN
VOUT
VOUT
VCC
VCC
1µF
1µF
GND
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS9077-00
November 2015
is a registered trademark of Richtek Technology Corporation.
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RT9077
Pin Description
Pin No.
Pin Name
Pin Function
1
VCC
Supply Voltage Input.
2
GND
Ground.
3
EN
Enable Control Input.
4
NC
No Internal Connection.
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 RT9077 is a low quiescent current linear regulator
designed especially for low external component systems.
The input voltage range is from 3.5V to 14V.
The RT9077 delivers the output power when it is set to
enable state. When it works in disable state, there is
almost no output power and the operation quiescent
current is less than 0.1μA (typ.).
Output Transistor
The RT9077 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.
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Current Limit Protection
The RT9077 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 30mA. Once the
junction temperature cools down by approximately 150°C,
the regulator automatically resumes operation.
is a registered trademark of Richtek Technology Corporation.
DS9077-00
November 2015
RT9077
Absolute Maximum Ratings
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(Note 1)
VCC, EN to GND -----------------------------------------------------------------------------------------------------------VOUT to GND
RT9077-90 -------------------------------------------------------------------------------------------------------------------RT9077-25/ RT9077-33/ RT9077-50 -----------------------------------------------------------------------------------VOUT to VCC --------------------------------------------------------------------------------------------------------------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 15V
−0.3V to 15V
−0.3V to 6V
−15V to 0.3V
0.43W
230.6°C/W
150°C
260°C
−60°C to 150°C
2kV
(Note 4)
Supply Input Voltage ------------------------------------------------------------------------------------------------------- 3.5V to 14V
Junction Temperature Range --------------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VOUT + 1 < VCC < 14V, TA = 25°C, unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Supply Voltage
VCC
3.5
--
14
V
Output Voltage Range
VOUT
2.5
--
12
V
DC Output Accuracy
VOUT
ILOAD = 1mA
2
--
2
%
0.4
1.2
V
VDROP
--
--
1.5
V
VCC Consumption Current
IQ
ILOAD = 100mA, VCC > 4.5V
ILOAD = 100mA,
VCC > 3.5V and < 4.5V
ILOAD = 20mA
--
Dropout Voltage
--
70
100
A
Shutdown GND Current
VEN = 0V
--
0.1
1
A
Shutdown Leakage Current
VEN = 0V, VOUT = 0V
--
0.1
1
A
VEN = 14V
--
0.1
--
A
ILOAD = 1mA, 5.5V < VCC < 14V
--
--
0.4
%
ILOAD = 1mA, 3.5V < VCC < 5.5V
--
0.1
0.2
%
--
0.5
1
%
210
350
490
mA
EN Input Current
IEN
Line Regulation
VLINE
Load Regulation
VLOAD
1mA < ILOAD < 200mA
Output Current Limit
ILIM
VOUT = 0.5 x VOUT(normal)
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 © 2015 Richtek Technology Corporation. All rights reserved.
DS9077-00
November 2015
V
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RT9077
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
RT9077
EN
VIN
3.5V to 14V
VOUT
CIN
1µF
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VCC
COUT
1µF
VOUT
GND
is a registered trademark of Richtek Technology Corporation.
DS9077-00
November 2015
RT9077
Typical Operating Characteristics
Output Voltage vs. Output Current
3.30
3.28
3.28
Output Voltage (V)
Output Voltage (V)
Output Voltage vs. Temperature
3.30
ILOAD = 20mA
ILOAD = 0.1mA
3.26
3.24
3.22
VCC = 4.3V
3.26
VCC = 14V
3.24
3.22
VCC = 4.3V, VOUT = 3.3V
3.20
VOUT = 3.3V
3.20
-50
-25
0
25
50
75
100
125
0
20
40
Temperature (°C)
80
100 120 140 160 180 200
Output Current (mA)
Output Voltage vs. Input Voltage
Quiescent Current vs. Temperature
120
3.30
ILOAD =
ILOAD =
ILOAD =
ILOAD =
3.28
3.26
0mA
0.1mA
10mA
20mA
Quiescent Current (μA)
Output Voltage (V)
60
3.24
3.22
4
5
6
7
8
9
10
11
12
13
80
60
40
20
VCC = 4V, VOUT = 3.3V, ILOAD = 20mA
VOUT = 3.3V
3.20
100
0
-50
14
-25
0
25
50
75
100
125
Temperature (°C)
Input Voltage (V)
SHDN Input Leakage Current vs. Input Voltage
Quiescent Current vs. Input Voltage
81.5
20
Shutdown Current (nA)
Quiescent Curren (μA)
71.5
61.5
51.5
41.5
31.5
21.5
16
12
8
4
11.5
VOUT = 3.3V, ILOAD = 20mA
1.5
4
5
6
7
8
9
10
11
12
13
Input Voltage (V)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS9077-00
EN = 0V
0
November 2015
14
4
6
8
10
12
14
Input Voltage (V)
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RT9077
EN Voltage vs. Input Voltage
1.0
2.0
0.8
1.6
0.6
VCC = 14V
VCC = 4.3V
0.4
High Threshold
EN Voltage (V)
Shutdown Leakage Current (μA)1
SHDN Input Leakage Current vs. Temperature
1.2
Low Threshold
0.8
0.4
0.2
EN = 0V
0.0
0.0
-50
-25
0
25
50
75
100
4
125
6
8
Temperature (°C)
EN Voltage vs. Temperature
12
0.5
Dropout Voltage (V)
1.6
High Threshold
1.2
0.8
Low Threshold
0.4
0.4
0.3
0.2
0.1
VCC = 14V
0.0
ILOAD = 50mA
0
-50
-25
0
25
50
75
100
125
-50
Input Voltage (V)
-25
0
25
50
75
100
125
Temperature (°C)
PSRR vs. Frequency
Current Limit vs. Temperature
0
450
VCC = 4.3V
400
350
-20
300
VCC = 14V
250
200
150
PSRR (dB)
Current Limit (A)
14
Dropout Voltage vs. Temperature
2.0
EN Voltage (V)
10
Input Voltage (V)
-40
-60
100
50
VOUT = 3.3V
0
-50
-25
0
25
50
75
100
Temperature ( °C )
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125
VCC = 4.3V, VOUT = 3.3V, ILOAD = 100mA
-80
10
100
1000
10000
Frequency (Hz)
is a registered trademark of Richtek Technology Corporation.
DS9077-00
November 2015
RT9077
Load Transient Response
Load Transient Response
VOUT_ac
(100mV/Div)
VOUT_ac
(50mV/Div)
I LOAD
(50mA/Div)
VCC = 12V, VOUT = 3.3V, ILOAD = 10mA to 100mA
I LOAD
(100mA/Div)
VCC = 4.3V, VOUT = 3.3V, ILOAD = 10mA to 150mA
Time (500μs/Div)
Time (250μs/Div)
Line Transient Response
Power On from EN
V CC
(10V/Div)
EN
(2V/Div)
VIN
(5V/Div)
VOUT
(2V/Div)
VOUT_ac
(20mV/Div)
VCC = 6V to 12V, VOUT = 3.3V, ILOAD = 100mA
Time (250μs/Div)
I LOAD
(100mA/Div)
VCC = 12V, VOUT = 3.3V, ILOAD = 100mA
Time (25μs/Div)
Power Off from EN
V CC
(10V/Div)
EN
(2V/Div)
VOUT
(2V/Div)
I LOAD
(100mA/Div)
VCC = 12V, VOUT = 3.3V, ILOAD = 100mA
Time (25μs/Div)
Copyright © 2015 Richtek Technology Corporation. All rights reserved.
DS9077-00
November 2015
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
7
RT9077
Applications Information
Enable
The RT9077 goes into shutdown mode when the EN pin
is in a logic low condition. During this condition, the
RT9077 has an EN pin to turn on or turn off the regulator,
When the EN pin is in logic high, the regulator will be
turned on. The shutdown current is almost 0μA typical.
The EN pin may be directly tied to VCC to keep the part
on. The Enable input is CMOS logic and cannot be left
floating.
Current Limit
The RT9077 contains an independent current limiter, which
monitors and controls the pass transistor's gate voltage,
limiting the output current to 0.35A (typ.). The output can
be shorted to ground indefinitely without damaging the
part.
Thermal Considerations
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 :
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 :
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.
1.0
Maximum Power Dissipation (W)1
Like any low dropout linear regulator, the RT9077's external
input and output capacitors must be properly selected for
stability and performance. Use a 1μF or larger input
capacitor and place it close to the IC's VCC and GND pins.
Any output capacitor meets the minimum 1mΩ ESR
(Equivalent Series Resistance) requirement may be used.
Place the output capacitor close to the IC's VOUT and
GND pins. Increasing capacitance and decreasing ESR
can improve the circuit’ s PSRR and line transient
response.
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) = (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.
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is a registered trademark of Richtek Technology Corporation.
DS9077-00
November 2015
RT9077
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.
DS9077-00
November 2015
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