RT9067
Ultra Low Power, 14V, 200mA LDO Regulator
General Description
Features
The RT9067 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.
The features of low quiescent current as low as 2µA and
zero disable current is ideal for powering the battery
equipment to a longer service life. The RT9067 is stable
2A Ground Current at no Load
±2% Output Accuracy
200mA Output Current with EN
Zero Disable Current
Maximum Operating Input Voltage 14V
Dropout Voltage: 0.4V at 100mA
Support Fixed Output Voltage 2.5V, 3.3V, 4.2V, 5V,
9V
Stable with Ceramic or Tantalum Capacitor
Current Limit Protection
Over-Temperature Protection
RoHS Compliant and Halogen Free
with ceramic output capacitors over its wide input range
from 3.5V to 14V and entire range of output load current
(0mA to 200mA).
Ordering Information
RT9067-
Applications
Package Type
B : SOT-23-5
X5 : SOT-89-5
Portable, Battery Powered Equipments
Ultra Low Voltage Microcontrollers
Notebook Computers
Lead Plating System
G : Green (Halogen Free and Pb Free)
Output Voltage
25 : 2.5V
33 : 3.3V
42 : 4.2V
50 : 5V
90 : 9V
Marking Information
For
marking
information,
contact
our
sales
representative directly or through a Richtek distributor
located in your area.
Note :
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
RT9067
EN
EN
VOUT
VOUT
COUT
VCC
VCC
CIN
GND
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February 2016
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RT9067
Pin Configurations
(TOP VIEW)
VOUT
NC
5
4
2
VOUT
VCC
5
4
3
1
2
3
NC
GND
EN
VCC GND EN
SOT-23-5
SOT-89-5
Functional Pin Description
Pin No.
Pin Name
Pin Function
SOT-23-5
SOT-89-5
1
4
VCC
Supply Voltage Input.
2
2
GND
Ground.
3
3
EN
Enable Control Input.
4
1
NC
No Internal Connection.
5
5
VOUT
Output of the Regulator.
Function Block Diagram
VCC
VOUT
Current/Thermal
Sense
+
GND
EN
Bandgap
Reference
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R1
R2
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RT9067
Operation
Basic Operation
The RT9067 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 minimum required output capacitance for stable
operation is 1F effective capacitance after consideration
of the temperature and voltage coefficient of the capacitor.
Output Transistor
The RT9067 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 PMOSFET to support good line regulation and load
regulation at output voltage.
Enable
The RT9067 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
zero.
Current Limit Protection
The RT9067 provides current limit function to prevent
the device from damages during over-load or shortedcircuit 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
150C (typ.) and the output current exceeds 30mA.
Once the junction temperature cools down by
approximately
20C,
the
regulator
automatically
resumes operation.
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RT9067
Absolute Maximum Ratings
(Note 1)
VCC, EN to GND -------------------------------------------------------------------------------------------------- 0.3V to 15V
VOUT to GND
RT9067-90 ---------------------------------------------------------------------------------------------------------- 0.3V to 15V
RT9067-25/ RT9067-33/RT9067-50 -------------------------------------------------------------------------- 0.3V to 6V
VOUT to VCC --------------------------------------------------------------------------------------------------------------------------------------------------------------- 15V to 0.3V
Power Dissipation, PD @ TA = 25°C
SOT-23-5 ------------------------------------------------------------------------------------------------------------------- 0.45W
SOT-89-5 ----------------------------------------------------------------------------------------------------------- 0.87W
Package Thermal Resistance (Note 2)
SOT-23-5, JA---------------------------------------------------------------------------------------------------------------------------------------------------------------- 218.1°C/W
SOT-89-5, JA --------------------------------------------------------------------------------------------------------------------------------------------------------------- 113.9°C/W
Lead Temperature (Soldering, 10 sec) ------------------------------------------------------------------------------ 260°C
Junction Temperature -------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range ----------------------------------------------------------------------------------- 60°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ------------------------------------------------------------------------------------- 2kV
Recommended Operating Conditions
(Note 4)
Supply Input Voltage, VCC ------------------------------------------------------------------------------------------------------------------------------------- 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 = 25C, 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
%
ILOAD = 100mA, VCC > 4.5V
--
0.4
1.2
V
--
--
1.5
V
ILOAD = 0mA, VOUT ≦ 5.5V
--
2
--
μA
ILOAD = 0mA, VOUT > 5.5V
--
3.5
--
μA
Shutdown GND Current
VEN = 0V
--
0.1
--
μA
Shutdown Leakage Current
VEN = 0V, VOUT = 0V
--
0.1
--
μA
VEN = 14V
--
0.1
--
μA
Dropout Voltage
VDROP
ILOAD = 100mA,
VCC > 3.5V and < 4.5V
VCC Consumption Current
EN Input Current
IQ
IEN
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DS9067-05
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RT9067
Parameter
Symbol
VLINE
Line Regulation
Test Conditions
Min
Typ
Max
Unit
ILOAD = 1mA, 5.5V < VCC < 14V
--
--
0.4
%
ILOAD = 1mA, 3.5V < VCC < 5.5V
--
0.1
0.3
%
--
0.5
1
%
210
350
490
mA
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
V
ILOAD = 30mA
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. JA is measured at TA = 25C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. JC is
measured at the exposed pad of the package.
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
RT9067
EN
VIN
3.5V to 14V
EN
VOUT
CIN
1μF
VCC
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DS9067-05
February 2016
VOUT
COUT
(Effective Capacitance
1μF)
GND
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RT9067
Typical Operating Characteristics
Output Voltage vs. Output Current
3.3
3.28
3.28
Output Voltage (V)
Output Voltage (V)
Output Voltage vs. Temperature
3.30
3.26
Vcc = 4.3V, Load = 0.1mA
Vcc = 4.3V, Load = 20mA
3.24
Vcc = 4.3V
3.26
Vcc = 14V
3.24
3.22
3.22
VOUT = 3.3V
VOUT=3.3V
3.2
3.20
-50
-25
0
25
50
75
100
0
125
20
40
60
Temperature (℃)
Quiescent Current vs. Temperature
2.5
3.28
2
Quiescent Current (μA)
Output Voltage (V)
Output Voltage vs. Input Voltage
3.3
3.26
3.24
Load = 0mA
Load = 0.1mA
Load = 10mA
Load = 20mA
3.22
5
6
1
0.5
VOUT = 3.3V
7
8
9
10
11
12
13
Vcc = 4.3V
Vcc = 14V
1.5
0
3.2
4
-50
14
-25
0
25
50
75
100
125
Temperature (℃)
Input Voltage (V)
SHDN Input Leakage Current vs. VIN
Quiescent Current vs. Input Voltage
2
20
1.8
16
Shutdown Current (nA)
Quiescent Current (μA)
80 100 120 140 160 180 200
Output Current (mA)
1.6
1.4
1.2
12
8
4
VOUT = 3.3V
EN = 0V
0
1
4
5
6
7
8
9
10
11
12
13
Input Voltage (V)
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14
4
6
8
10
12
14
Input Voltage (V)
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February 2016
RT9067
SHDN Input Leakage Current vs. Temp.
Enable Threshold vs. Input Voltage
2
High Threshold
0.8
1.6
Vcc = 14V
Vcc = 4.3V
EN Voltage (V)
Shutdown Leakage Current (μA)
1
0.6
0.4
0.2
1.2
Low Threshold
0.8
0.4
EN = 0V
0
-50
-25
0
25
50
75
100
0
125
4
6
8
Temperature (℃)
Enable Threshold vs. Temperature
12
0.5
0.4
Dropout Voltage (V)
1.6
High Threshold
1.2
0.8
Low Threshold
0.3
0.2
0.1
0.4
Vcc = 14V
Load = 50mA
0
0
-50
-25
0
25
50
75
100
-50
125
-25
25
50
75
100
125
Ground Current vs. Load Current
Current Limit vs. Temperature
250
450
Vcc = 4.3V
400
300
Vcc = 14V
250
200
150
100
GND Current (μA)
200
350
Current Limit (A)
0
Temperature (℃)
Temperature (℃)
150
100
50
50
Rising, Ta = +125℃
Rising, Ta = +25℃
Rising, Ta = -40℃
VOUT = 3.3V
0
-50
-25
0
25
50
75
100
Temperature ( °C )
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Dropout Voltage vs. Temperature
2
EN Voltage (V)
10
Input Voltage (V)
February 2016
125
0
0.001
0.01
0.1
1
10
100
1000
LOAD Current (mA)
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RT9067
PSRR vs. Frequency
Load Transient Response
0
Vcc = 4.3V, VOUT = 3.3V, Load = 100mA
PSRR (dB)
-20
VOUT_ac
(50mV/Div)
-40
-60
ILOAD
(50mA/Div)
-80
10
100
1000
Vcc = 12V, VOUT = 3.3V, ILOAD = 10mA to 100mA
10000
Frequency (Hz)
Time (250μs/Div)
Line Transient Response
Load Transient Response
VOUT_ac
(100mV/Div)
VIN
(5V/Div)
VOUT_ac
(20m/Div)
Vcc = 6V to 12V, VOUT = 3.3V, ILOAD = 100mA
ILOAD
(100mA/Div)
Time (250μs/Div)
Time (100μs/Div)
Power On from EN
Power Off from EN
Vcc
(10V/Div)
Vcc
(10V/Div)
EN
(2V/Div)
VOUT
(2V/Div)
EN
(2V/Div)
ILOAD
(100mA/Div)
VOUT
(2V/Div)
Vcc = 12V, VOUT = 3.3V, ILOAD = 100mA
Time (25μs/Div)
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Vcc = 4.3V, VOUT = 3.3V, ILOAD = 10mA to 150mA
ILOAD
(100mA/Div)
Vcc = 12V, VOUT = 3.3V, ILOAD = 100mA
Time (25μs/Div)
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February 2016
RT9067
Application Information
Like any low dropout linear regulator, the RT9067's
Thermal Considerations
external input and output capacitors must be properly
For continuous operation, do not exceed absolute
selected for stability and performance. Use a 1µF or
maximum junction temperature. The maximum power
larger input capacitor and place it close to the IC's VCC
dissipation depends on the thermal resistance of the IC
and GND pins. Any output capacitor meeting meets the
package, PCB layout, rate of surrounding airflow, and
minimum 1mΩ ESR (Equivalent Series Resistance) and
difference between junction and ambient temperature.
effective capacitance larger than 1F requirement may
The maximum power dissipation can be calculated by
be used. Place the output capacitor close to the IC's
the following formula:
VOUT and GND pins. Increasing capacitance and
PD(MAX) = (TJ(MAX) TA) / JA
decreasing ESR can improve the circuit's PSRR and
where TJ(MAX) is the maximum junction temperature, TA
line transient response.
is the ambient temperature, and JA is the junction to
ambient thermal resistance.
Enable
The RT9067 goes into sleep mode when the EN pin is
in a logic low condition. During this condition, the
RT9067 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 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.
For recommended operating condition specifications,
the maximum junction temperature is 125C. The
junction to ambient thermal resistance, JA, is layout
dependent. For SOT-23-5 packages, the thermal
resistance, JA, is 218.1C/W on a standard JEDEC 517 four-layer thermal test board. For SOT-89-5 packages,
the thermal resistance, JA, is 113.9C/W on a standard
JEDEC 51-7 four-layer thermal test board. The
PSRR
maximum power dissipation at TA = 25C can be
The power supply rejection ratio (PSRR) is defined as
the gain from the input to output divided by the gain from
the supply to the output. The PSRR is found to be
∆Gain Error
PSRR=20 x log(
)
∆Supply
Note that in heavy load measuring, Δsupply will cause
Δtemperature. And Δtemperature will cause Δoutput
voltage. So the temperature effect is include in heavy
load PSRR measuring.
Current Limit
calculated by the following formula :
PD(MAX) = (125C 25C) / (218.1C/W) = 0.4585W for
SOT-23-5 package
PD(MAX) = (125C 25C) / (113.9C/W) = 0.8779W for
SOT-89-5 package
The maximum power dissipation depends on the
operating ambient temperature for fixed TJ(MAX) and
thermal resistance, JA. The derating curve in Figure 1
allows the designer to see the effect of rising ambient
temperature on the maximum power dissipation.
The RT9067 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.
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February 2016
is a registered trademark of Richtek Technology Corporation.
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RT9067
Four-Layer PCB
SOT-89-5
SOT-23-5
Figure 1. Derating Curve of Maximum Power Dissipation
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RT9067
Outline Dimension
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RT9067
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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is a registered trademark of Richtek Technology Corporation.
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