®
RT9080
2μ
μA IQ, 600mA Low-Dropout Linear Regulator
General Description
Features
The RT9080 is a low-dropout (LDO) voltage regulators with
enable function that operates from 1.2V to 5.5V. It provides
up to 600mA of output current and offers low-power
operation in miniaturized packaging.
The features of low quiescent current as low as 2μA and
almost zero disable current is ideal for powering the battery
equipment to a longer service life. The RT9080 is stable
with the ceramic output capacitor over its wide input range
from 1.2V to 5.5V and the entire range of output load
current (0mA to 600mA).
Ordering Information
RT9080/NPackage Type
J5 : TSOT-23-5
QZ : ZQFN-4L 1x1 (Z-Type)
(ZDFN-4L 1x1)
Lead Plating System
G : Green (Halogen Free and Pb Free)
2μ
μA Ground Current at no Load
PSRR = 75dB at 1kHz
Adjustable Output Voltage Available by Specific
Application
±2% Output Accuracy
600mA (VIN ≥ 2.3V) Output Current with EN
Low (0.1μ
μA) Disable Current
1.2V to 5.5V Operating Input Voltage
Dropout Voltage : 0.31V at 600mA when VOUT ≥ 3V
Support Fixed Output Voltage 0.8V to 3.3V
Stable with Ceramic or Tantalum Capacitor
Current Limit Protection
Over Temperature Protection
TSOT-23-5 and ZQFN-4L 1x1 (ZDFN-4L 1x1) Packages
Available
Applications
Portable, Battery Powered Equipment
Ultra Low Power Microcontrollers
Notebook computers
Output Voltage
08 : 0.8V
:
33 : 3.3V
Special Request : Any voltage between
0.8V and 3.3V under specific business
agreement
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Pin Function
RT9080 : Without SNS Pin
RT9080N : With SNS Pin
Marking Information
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.
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RT9080
Pin Configurations
(TOP VIEW)
VOUT
SNS/NC
5
4
VOUT
1
4
VIN
3
EN
SGND
2
3
GND
2
5
VIN GND EN
TSOT-23-5
ZQFN-4L 1x1 (ZDFN-4L 1x1)
Functional Pin Description
Pin No.
TSOT-23-5 ZQFN-4L 1x1 (ZDFN-4L 1x1)
Pin Name
Pin Function
1
4
VIN
Supply Voltage Input.
2
2
GND
Ground.
3
3
EN
Enable Control Input.
4
--
SNS
Output Voltage Sense. (RT9080N only)
NC
No Internal Connection.
5
1
VOUT
Output of the Regulator.
--
5 (Exposed Pad)
SGND
Substrate of Chip. Leave floating or tie to GND.
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RT9080
Function Block Diagram
VIN
(without sense
function)
Current/Thermal
Sense
GND
SNS
(with sense
function)
+
-
EN
Bandgap
Reference
VOUT
R1
EN
R2
Operation
Basic operation
Enable
The RT9080 is a low quiescent current linear regulator
designed especially for low external components system.
The input voltage range is from 1.2V to 5.5V.
The RT9080 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 RT9080 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 RT9080 provides current limit function to prevent the
device from damages during over-load or shorted-circuit
condition. This current is detected by an internal sensing
transistor.
Over Temperature Protection
The over temperature protection function will turn off the
P-MOSFET when the junction temperature exceeds 150°C
(typ.), and the output current exceeds 80mA. Once the
junction temperature cools down by approximately 20°C,
the regulator will automatically resume operation.
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RT9080
Absolute Maximum Ratings
(Note 1)
VIN, VOUT, SNS, EN to GND ------------------------------------------------------------------------------------------- −0.3V to 6.5V
VOUT to VIN ---------------------------------------------------------------------------------------------------------------- −6.5V to 0.3V
Power Dissipation, PD @ TA = 25°C
TSOT-23-5 ------------------------------------------------------------------------------------------------------------------- 0.43W
ZQFN-4L 1x1 (ZDFN-4L 1x1) -------------------------------------------------------------------------------------------- 0.39W
Package Thermal Resistance (Note 2)
TSOT-23-5, θJA ------------------------------------------------------------------------------------------------------------- 230.6°C/W
ZQFN-4L 1x1 (ZDFN-4L 1x1), θJA -------------------------------------------------------------------------------------- 256°C/W
ZQFN-4L 1x1 (ZDFN-4L 1x1), θJC ------------------------------------------------------------------------------------- 204°C/W
Lead Temperature (Soldering, 10 sec.) ------------------------------------------------------------------------------- 260°C
Junction Temperature ----------------------------------------------------------------------------------------------------- 150°C
Storage Temperature Range -------------------------------------------------------------------------------------------- −65°C to 150°C
ESD Susceptibility (Note 3)
HBM (Human Body Model) ---------------------------------------------------------------------------------------------- 2kV
MM (Machine Model) ------------------------------------------------------------------------------------------------------ 150V
Recommended Operating Conditions
(Note 4)
Input Voltage, VIN --------------------------------------------------------------------------------------------------------- 1.2V to 5.5V
Junction Temperature Range -------------------------------------------------------------------------------------------- −40°C to 125°C
Ambient Temperature Range -------------------------------------------------------------------------------------------- −40°C to 85°C
Electrical Characteristics
(VOUT + 1 < VIN < 5.5V, TA = 25°C, unless otherwise specified)
Parameter
Min
Typ
Max
Unit
0.8
--
3.3
V
ILOAD = 1mA
2
--
2
%
0.8V VOUT 1.05V
--
1.05
1.33
1.05V VOUT 1.2V
--
0.8
1.13
1.2V VOUT 1.5V
--
0.71
1.03
1.5V VOUT 1.8V
--
0.57
0.93
1.8V VOUT 2.1V
--
0.57
0.83
2.1V VOUT 2.5V
--
0.41
0.73
2.5V VOUT 3V
--
0.36
0.63
3V VOUT
--
0.31
0.53
ILOAD = 0mA, VOUT ≦ 5.5V
--
2
4
A
Shutdown GND Current
(Note 6)
VEN = 0V
--
0.1
0.5
A
Shutdown Leakage Current
(Note 6)
VEN = 0V, VOUT = 0V
--
0.1
0.5
A
VEN = 5.5V
--
--
0.1
A
Output Voltage Range
Symbol
VOUT
DC Output Accuracy
Dropout Voltage
(ILOAD = 600mA)
(Note 5)
VCC Consumption Current
EN Input Current
Test Conditions
VDROP
IQ
IEN
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V
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RT9080
Parameter
Symbol
LINE
Line Regulation
Test Conditions
ILOAD = 1mA
Min
Typ
Max
1.2V VIN 1.5V
--
0.3
0.6
1.5V VIN 1.8V
--
0.15
0.3
1.8V VIN 5.5V
--
0.13
0.35
Unit
%
Load Regulation
LOAD
1mA < ILOAD < 600mA
--
0.5
1
%
Power Supply Rejection
Ratio
PSRR
VIN = 3V, ILOAD = 50mA,
COUT = 1F, VOUT = 2.5V, f = 1kHz
--
75
--
dB
VOUT = 0.8V
--
26
--
VOUT = 1.2V
--
37
--
VOUT = 1.8V
--
39
--
VOUT = 3.3V
--
42
--
COUT = 1F,
ILOAD = 150mA,
BW = 10Hz to
100kHz,
VIN = VOUT + 1V
Output Voltage Noise
Output Current Limit
VRMS
ILIM
VOUT = 90%VOUT(Normal)
610
1100
--
Logic-High
VIH
VIN = 5V
0.9
--
--
Logic-Low
VIL
VIN = 5V
--
--
0.4
Thermal Shutdown
Temperature
TSD
ILOAD = 30mA, VIN 1.5V
--
150
--
C
Thermal Shutdown
Hysteresis
TSD
--
20
--
C
--
80
--
Enable Input
Voltage
Discharge Resistance
EN = 0V, VOUT = 0.1V
mA
V
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.
Note 5. The dropout voltage is defined as VIN − VOUT, when VOUT is 98% of the normal value of VOUT.
Note 6. The specification is tested at wafer stage and guarantee by design after assembly.
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RT9080
Typical Application Circuit
RT9080N
VIN
CIN
1µF
EN
VIN
VOUT
VOUT
COUT
(Effective Capacitance
SNS
1µF)
EN
GND
Figure 1. Application with Sense Function
RT9080
VIN
CIN
1µF
EN
VIN
VOUT
VOUT
COUT
(Effective Capacitance
1µF)
EN
GND
Figure 2. Application without Sense Function
RT9080N
VIN
CIN
1µF
VIN
VOUT
VOUT
R1
SNS
EN
EN
NC
COUT
(Effective Capacitance
1µF)
R2
GND
Figure 3. Adjustable Output Voltage Application Circuit
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RT9080
Typical Operating Characteristics
Output Voltage vs. Temperature
3.40
0.88
3.38
0.86
3.36
Output Voltage (V)
Output Voltage (V)
Output Voltage vs. Temperature
0.90
0.84
0.82
0.80
VIN = 1.2V
VIN = 2.1V
VIN = 5.5V
0.78
0.76
0.74
3.34
3.32
VIN = 3.8V
VIN = 4.5V
VIN = 5.5V
3.30
3.28
3.26
3.24
0.72
3.22
VOUT = 0.8V, ILOAD = 1mA
0.70
VOUT = 3.3V, ILOAD = 1mA
3.20
-50
-25
0
25
50
75
100
125
-50
-25
0.90
1.00
0.88
0.95
0.86
0.90
Output Voltage (V)
Output Voltage (V)
50
75
100
125
Output Voltage vs. Load Current
Output Voltage vs. Input Voltage
0.84
0.82
0.80
0.78
0.76
0.74
0.85
0.80
VIN = 3V
VIN = 5V
0.75
0.70
0.65
0.60
0.72
0.55
VOUT = 0.8V, ILOAD = 1mA
0.70
ILOAD = 0mA to 600mA
0.50
1.2
2.06
2.92
3.78
4.64
5.5
0
50 100 150 200 250 300 350 400 450 500 550 600
Input Voltage (V)
Load Current (mA)
Ground Current vs. Load Current
350
VOUT = 0.8V
250
200
150
TA = −40°C
TA = 25°C
TA = 125°C
100
50
0
0.01
Ground Current vs. Load Current
VOUT = 3.3V
300
GND Current (μA)
300
GND Current (μA)
25
Temperature (°C)
Temperature (°C)
350
0
250
200
TA = −40°C
TA = 25°C
TA = 125°C
150
100
50
0.1
1
10
100
Load Current (mA)
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1000
0
0.01
0.1
1
10
100
1000
Load Current (mA)
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RT9080
Shutdown Current vs. Input Voltage
Shutdown Leakage Current vs. Temperature
0.045
VOUT = 0.8V, EN = 0V
Shutdown Leakage Current (μA)1
Shutdown Current (μA)1
0.10
0.08
0.06
0.04
0.02
0.00
1
2
3
4
5
VOUT = 0.8V, EN = 0V
0.040
0.035
0.030
0.025
0.020
VIN = 1.8V
VIN = 5.5V
0.015
0.010
0.005
0.000
-50
6
-25
0
Enable Threshold vs. Input Voltage
Enable High
Enable High
EN Voltage (V)
EN Voltage (V)
Enable Low
0.5
0.4
0.3
0.2
0.66
0.65
0.64
Enable Low
0.63
0.1
0.62
0.0
0.61
VIN = 5.5V
1
2
3
4
5
-50
6
-25
0
Input Voltage (V)
25
50
75
100
125
Temperature (°C)
Dropout Voltage vs. Temperature
ILOAD = 1mA
ILOAD = 400mA
ILOAD = 10mA ILOAD = 500mA
ILOAD = 100mA ILOAD = 600mA
ILOAD = 200mA
ILOAD = 300mA
Current Limit vs. Temperature
1200
VOUT = 3.3V
VOUT = 0.8V
1000
VOUT = 3.3V
Current Limit (mA)
Dropout Voltage (mV)
125
0.67
0.6
350
100
Enable Threshold vs. Temperature
0.7
400
75
0.68
0.8
450
50
Temperature (°C)
Input Voltage (V)
500
25
300
250
200
150
100
800
600
400
200
50
0
VIN = 5V
0
-50
-25
0
25
50
75
100
Temperature (°C)
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125
-50
-25
0
25
50
75
100
125
Temperature ( °C )
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RT9080
Fold-back Current Limit vs. Temperature
SNS Input Current vs. Temperature
1400
0.9
0.8
SNS Input Current (μA)
Current Limit (mA)
1200
1000
VOUT = 3.3V
800
600
VOUT = 0.8V
400
200
VIN = 5V
0
0.7
0.6
0.5
0.4
0.3
0.2
0.1
VIN = 5V, VOUT = 0.8V, EN = 3V
0.0
-50
-25
0
25
50
75
100
125
-50
0
25
50
75
Temperature ( °C )
Temperature (℃ )
Power On from EN
Power Off from EN
EN
(2V/Div)
EN
(2V/Div)
VOUT
(2V/Div)
VOUT
(2V/Div)
I LOAD
(200mA/Div)
I LOAD
(200mA/Div)
VIN = 4V, VOUT = 3.3V, ILOAD = 600mA
100
125
VIN = 4V, VOUT = 3.3V, ILOAD = 600mA
Time (500μs/Div)
Time (500μs/Div)
Line Transient
Load Transient
VIN = 2.8V to 3.8V, VOUT = 1.8V, ILOAD = 1mA
VIN = 1.8V, VOUT = 0.8V, ILOAD = 1mA to 600mA
I LOAD
(200mA/Div)
VIN
(1V/Div)
VOUT
(2mV/Div)
VOUT
(20mV/Div)
Time (250μs/Div)
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-25
Time (100μs/Div)
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RT9080
PSRR vs. Frequency
0
-20
-20
PSRR (dB)
PSRR (dB)
PSRR vs. Frequency
0
-40
ILOAD = 15mA
ILOAD = 50mA
ILOAD = 150mA
-60
-40
ILOAD = 15mA
ILOAD = 50mA
ILOAD = 150mA
-60
-80
-80
VIN = 2.8V, VOUT = 0.8V, COUT = 1μF
VIN = 2V, VOUT = 0.8V, COUT = 1μF
-100
-100
10
1,000
100,000
10,000,000
10
1,000
Frequency (Hz)
-20
-20
-40
ILOAD = 30mA
ILOAD = 150mA
-80
-40
ILOAD = 30mA
ILOAD = 150mA
ILOAD = 300mA
ILOAD = 600mA
-60
-80
VIN = 5V, VOUT = 3.3V, COUT = 1μF
VIN = 3.8V, VOUT = 3.3V, COUT = 1μF
-100
-100
10
1000
100000
10000000
10
1000
Frequency (Hz)
100000
10000000
Frequency (Hz)
Output Noise
Output Noise
500
500
400
400
300
300
200
200
Noise (μV)
Noise (μV)
10,000,000
PSRR vs. Frequency
0
PSRR (dB)
PSRR (dB)
PSRR vs. Frequency
0
-60
100,000
Frequency (Hz)
100
0
-100
-200
100
0
-100
-200
-300
-300
VIN = 1.8V, VOUT = 0.8V, ILOAD = 600mA,
COUT = 1μF, Frequency = 10Hz to 100kHz
-400
-500
VIN = 4.5V, VOUT = 3.3V, ILOAD = 600mA,
COUT = 1μF, Frequency = 10Hz to 100kHz
-400
-500
0
1
2
3
4
5
6
7
8
sec (m)
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9
10
0
1
2
3
4
5
6
7
8
9
10
sec (m)
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RT9080
Application Information
Enable
The RT9080 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 VIN to keep the
part on. The Enable input is CMOS logic and cannot be
left floating.
Adjustable Output Voltage Setting
Because of the small input current at the SNS pin, the
RT9080N with SNS pin also can work as an adjustable
output voltage LDO. Figure 3 gives the connections for
the adjustable output voltage application. The resistor
divider from VOUT to SNS sets the output voltage when
in regulation.
The voltage on the SNS pin sets the output voltage and is
determined by the values of R1 and R2. In order to keep
a good temperature coefficient of output voltage, the values
of R1 and R2 should be selected carefully to ignore the
temperature coefficient of input current at the SNS pin. A
current greater than 50μA in the resistor divider is
recommended to meet the above requirement. The
adjustable output voltage can be calculated using the
formula given in equation 1 :
VOUT R1 + R2 VSNS
(1)
R2
where VSNS is determined by the output voltage selections
in the ordering information of RT9080N. The maximum
adjustable output voltage can be as high as input voltage
deducted by the dropout voltage.
When we choose 51kΩ and 16kΩ as R1 and R2
respectively, and select a 0.8V output at SNS pin, the
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adjustable output voltage will be set to around 3.35V. Its
temperature coefficient in Figure 4 is still perfect in such
kind of application.
Output Voltage vs. Temperature
3.35
3.34
Output Voltage (V)
Like any low dropout linear regulator, the RT9080’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 VIN and GND
pins. Any output capacitor meeting the minimum 1mΩ
ESR (Equivalent Series Resistance) and effective
capacitance larger than 1μF 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.
3.33
3.32
3.31
3.30
3.29
ILOAD = 1mA
3.28
-50
-25
0
25
50
75
100
125
Temperature(°C)
Figure 4. Temperature Coefficient of Adjustable Output
Voltage
The minimum recommended 50μA in the resistor divider
makes the application no longer an ultra low quiescent
LDO. Figure 5 is another fine adjustable output voltage
application can keep the LDO still operating in low power
consumption. The fine tune range is recommended to be
less than 50mV (R1 ≤ 91kΩ) in order to keep a good
temperature coefficient of the output voltage.
RT9080N
VIN
VOUT
1µF
R1
SNS
56pF/NC
1µF
EN
GND
Figure 5. Fine Adjustable Output Voltage Application
Circuit
There isn't extra current consumption in the above
application. But the temperature coefficient of output
voltage will be degraded by the input current at SNS pin.
If the tuning range is larger than 50mV, a compensation
capacitor (56pF) is required to keep the stability of output
voltage. The fine adjustable output voltage is calculated
using the formula given in equation2 :
VOUT VSNS + ISNS R1
(2)
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RT9080
where ISNS is the input Current at SNS pin (typical 550nA
at room temperature) and VSNS is determined by the
output voltage selections in the ordering information of
RT9080N.
The maximum power dissipation depends on the operating
ambient temperature for fixed T J(MAX) and thermal
resistance, θJA. The derating curve in Figure 6 allows the
designer to see the effect of rising ambient temperature
on the maximum power dissipation.
Current Limit
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 :
2.0
Maximum Power Dissipation (W)1
The RT9080 contains an independent current limiter, which
monitors and controls the pass transistor's gate voltage,
limiting the output current to 1.1A (typ.). The current
limiting level is reduced to around 0.6A named fold-back
current limit when the output voltage is further decreased.
The output can be shorted to ground indefinitely without
damaging the part.
Four-Layer PCB
1.5
ZQFN-4L 1x1 (ZDFN-4L 1x1)
1.0
0.5
TSOT-23-5
0.0
Ambient Temperature (°C)
Figure 6. 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.
For recommended operating condition specifications the
maximum junction temperature is 125°C and TA is the
ambient temperature. 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. For
ZQFN-4L 1x1 (ZDFN-4L 1x1) package, the thermal
resistance, θJA, is 256°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
PD(MAX) = (125°C − 25°C) / (256°C/W) = 0.39W for
ZQFN-4L 1x1 (ZDFN-4L 1x1) package
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RT9080
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
Copyright © 2016 Richtek Technology Corporation. All rights reserved.
DS9080-00 April 2016
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
13
RT9080
1
1
2
2
DETAIL A
Pin #1 ID and Tie Bar Mark Options
Note : The configuration of the Pin #1 identifier is optional,
but must be located within the zone indicated.
Symbol
Dimensions In Millimeters
Dimensions In Inches
Min.
Max.
Min.
Max.
A
0.300
0.400
0.012
0.016
A1
0.000
0.050
0.000
0.002
A3
0.117
0.162
0.005
0.006
b
0.175
0.275
0.007
0.011
D
0.900
1.100
0.035
0.043
D2
0.450
0.550
0.018
0.022
E
0.900
1.100
0.035
0.043
E2
0.450
0.550
0.018
0.022
e
L
0.625
0.200
0.025
0.300
0.008
0.012
H
0.039
0.002
H1
0.064
0.003
Z-Type 4L QFN 1x1 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.
www.richtek.com
14
DS9080-00 April 2016
工商网监
湘ICP备2023018690号
