RT9073-18GU5 [RICHTEK]
IC REG LINEAR 1.8V 250MA SC70-5;
| 型号： | RT9073-18GU5 |
| 厂家： | 
RICHTEK TECHNOLOGY CORPORATION |
| 描述： | IC REG LINEAR 1.8V 250MA SC70-5 |
| 文件： | 总14页 (文件大小：229K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
RT9073
1μA IQ, 250mA Low-Dropout Linear Regulator
General Description
Features
1μA Ground Current at no Load
PSRR = 75dB at 1kHz
The RT9073 is a low-dropout (LDO) voltage regulators with
enable function that operates from 1.2V to 5.5V. It provides
up to 250mA of output current and offers low-power
operation in miniaturized packaging.
Adjustable Output Voltage Available by Specific
Application
2% Output Accuracy
The features of low quiescent current as low as 1μA and
almost zero disable current is ideal for powering the battery
equipment to a longer service life. The RT9073 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 250mA).
250mA (VIN ≥ 2.3V) Output Current with EN
Low (0.1μA) Disable Current
1.2V to 5.5V Operating Input Voltage
Dropout Voltage : 0.45V (typ.) at 250mA when VOUT
≥ 3V
Support Fixed Output Voltage 0.9V, 1.05V, 1.2V, 1.5V,
1.8V, 1.9V, 2.5V, 2.7V, 2.8V, 2.9V, 3V, 3.3V
Stable with Ceramic or Tantalum Capacitor
Current Limit Protection
Ordering Information
RT9073/N-
Package Type
B : SOT-23-5
U5 : SC-70-5
Over Temperature Protection
SOT-23-5 and SC-70-5 Packages Available
Lead Plating System
G : Green (Halogen Free and Pb Free) Applications
Output Voltage
09 : 0.9V
Portable, Battery Powered Equipment
Ultra Low Power Microcontrollers
Notebook Computers
1K : 1.05V
12 : 1.2V
15 : 1.5V
18 : 1.8V
Marking Information
19 : 1.9V
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
25 : 2.5V
27 : 2.7V
28 : 2.8V
29 : 2.9V
30 : 3.0V
33 : 3.3V
Special Request : Any Voltage
Between 0.9V and 3.3V under
specific business agreement
Pin Function
RT9073 : With SNS Pin
RT9073N : Without SNS Pin
Note :
Richtek products are :
RoHS compliant and compatible with the current require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Copyright 2017 Richtek Technology Corporation. All rights reserved.
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is a registered trademark of Richtek Technology Corporation.
DS9073-06 June 2017
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1
RT9073
Pin Configuration
(TOP VIEW)
VOUT
SNS/NC
VOUT SNS/NC
5
4
5
4
3
2
2
3
VIN
EN
GND
VIN GND EN
SOT-23-5
SC-70-5
Functional Pin Description
Pin No.
Pin Name
Pin Function
SOT-23-5
SC-70-5
1
2
3
1
2
3
VIN
Supply voltage input.
Ground.
GND
EN
Enable control input.
Output voltage sense.
SNS
NC
4
5
4
5
No internal connection. (RT9073N only)
Output of the regulator.
VOUT
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DS9073-06 June 2017
RT9073
Functional Block Diagram
VIN
VOUT
(without sense
function)
Current/Thermal
Sense
GND
SNS
(with sense
function)
R1
R2
Bandgap
Reference
EN
Operation
Basic operation
Current Limit Protection
The RT9073 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 RT9073 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.
The minimum required output capacitance for stable
operation is 1μF effective capacitance after consideration
of the temperature and voltage coefficient of the capacitor.
Over Temperature Protection
The over temperature protection function will turn off the
P-MOSFET when the junction temperature exceeds 150°C
(typ.), VIN ≥ 1.5V and the output current exceeds 30mA.
Once the junction temperature cools down by
approximately 20°C, the regulator will automatically
resume operation.
Output Transistor
The RT9073 builds in a P-MOSFET output transistor which
provides a low switch-on resistance for low dropout voltage
applications.
Error Amplifier
The ErrorAmplifier 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 RT9073 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.
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RT9073
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
SOT-23-5 -------------------------------------------------------------------------------------------------------------------- 0.45W
SC-70-5 ---------------------------------------------------------------------------------------------------------------------- 0.29W
Package Thermal Resistance (Note 2)
SOT-23-5, θJA --------------------------------------------------------------------------------------------------------------- 218.1°C/W
SC-70-5, θJA ---------------------------------------------------------------------------------------------------------------- 342.3°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) ------------------------------------------------------------------------------------------------------ 200V
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
Output Voltage Range
DC Output Accuracy
Symbol
Test Conditions
Min
0.9
2
--
Typ
--
Max
3.3
Unit
V
VOUT
ILOAD = 1mA
--
2
%
0.9V VOUT 1.2V
1.2V VOUT 1.5V
1.5V VOUT 1.8V
1.8V VOUT 2.5V
2.5V VOUT 3V
3V VOUT
0.5
0.3
0.2
0.15
0.1
0.08
1.25
1
0.65
0.4
--
--
0.24
0.18
0.15
0.12
1.45
1.2
Dropout Voltage
(ILOAD = 50mA) (Note 5)
VDROP
V
--
--
--
0.9V VOUT 1.2V
1.2V VOUT 1.5V
1.5V VOUT 1.8V
1.8V VOUT 2.5V
2.5V VOUT 3V
3V VOUT
--
--
--
0.81
0.68
0.51
0.45
0.9
Dropout Voltage
(ILOAD = 250mA) (Note 5)
VDROP
V
--
0.8
--
0.6
--
0.6
ILOAD = 0mA, VOUT 5.5V,
VIN VOUT + VDROP
VCC Consumption Current
IQ
--
1
3
A
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DS9073-06 June 2017
RT9073
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Shutdown GND Current
VEN = 0V
--
0.1
0.5
A
Shutdown Leakage Current
EN Input Current
VEN = 0V, VOUT = 0V
VEN = 5.5V
--
0.1
0.5
A
A
IEN
--
--
--
--
--
--
--
--
--
--
--
--
0.1
0.6
0.3
0.1
0.15
1
1.2V VIN 1.5V
1.5V VIN 1.8V
1.8V VIN 2.1V
2.1V VIN 5.5V
Line Regulation
Load Regulation
LINE
ILOAD = 10mA
%
LOAD
5mA < ILOAD < 250mA
%
Power Supply Rejection
Ratio
VIN = 3V, ILOAD = 50mA,
COUT = 1F, VOUT = 2.5V, f = 1kHz
PSRR
--
75
--
dB
V
OUT = 0.9V
--
--
39
46
48
58
350
270
--
--
--
C
OUT = 1F,
ILOAD = 30mA,
BW = 10Hz to
100kHz,
VOUT = 1.2V
VOUT = 1.8V
VOUT = 3.3V
Output Voltage Noise
VRMS
--
--
VIN = VOUT + 2V
--
--
Output Current Limit
ILIM
Peak output current
260
150
1.2
--
500
390
--
mA
mA
Fold-Back Current Limit
VOUT = 0.5V x VOUT(normal)
VIN = 5V
Logic-High
Logic-Low
VIH
VIL
Enable Input
Voltage
V
VIN = 5V
--
0.4
Thermal Shutdown
Temperature
TSD
ILOAD = 30mA, VIN 1.5V
--
--
150
20
--
--
C
C
Thermal Shutdown
Hysteresis
TSD
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
.
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RT9073
Typical Application Circuit
RT9073
V
IN
VIN
EN
VOUT
SNS
V
OUT
C
1µF
C
IN
OUT
(Effective Capacitance 1µF)
EN
GND
Figure 1. Application with Sense Function
RT9073N
V
IN
VIN
EN
VOUT
V
OUT
C
1µF
C
IN
OUT
(Effective Capacitance 1µF)
EN
GND
Figure 2. Application without Sense Function
RT9073
V
IN
VIN
EN
V
VOUT
SNS
OUT
C
1µF
IN
NC
C
OUT
R1
R2
(Effective Capacitance 1µF)
EN
GND
Figure 3. Adjustable Output Voltage Application Circuit
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DS9073-06 June 2017
RT9073
Typical Operating Characteristics
Output Voltage vs. Temperature
Output Voltage vs. Temperature
0.91
0.90
0.89
0.88
0.87
0.86
3.32
3.31
3.30
ILOAD = 1mA
ILOAD = 250mA
3.29
ILOAD = 1mA
ILOAD = 250mA
3.28
3.27
3.26
3.25
VIN = 5V VOUT = 3.3V
50 75 100 125
VIN = 5V VOUT = 0.9V
-50
-25
0
25
50
75
100
125
-50
-25
0
25
Temperature (°C)
Temperature (°C)
Output Voltage vs. Input Voltage
Output Voltage vs. Output Current
0.904
0.902
0.900
0.898
0.896
0.894
0.892
0.890
3.33
3.32
3.31
3.3
3.29
3.28
VOUT = 0.9V, ILOAD = 1mA
3.5 4.5 5.5
VIN = 5V VOUT = 3.3V
1
1.5
2
2.5
3
4
5
0
30
60
90
120 150 180 210 240
Input Voltage (V)
Output Current (mA)
Ground Current vs. Input Voltage
Ground Current vs. Temperature
2.1
1.8
1.5
1.2
0.9
0.6
0.3
0
1.5
1.4
1.3
1.2
1.1
1
0.9
0.8
VOUT = 0.9V
4.5 5.5
VIN = 5V, VOUT = 3.3V
1
1.5
2
2.5
3
3.5
4
5
-50
-25
0
25
50
75
100
125
Temperature (°C)
Input Voltage (V)
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RT9073
Shutdown Current vs. Temperature
Shutdown Current vs. Input Voltage
0.30
0.25
0.20
0.15
0.10
0.05
0.00
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
VEN = 0V
VOUT = 0.9V, VEN = 0V
VIN = 5V
VIN = 3.5V
-50
-25
0
25
50
75
100
125
1.2 1.6
2
2.4 2.8 3.2 3.6
4
4.4 4.8 5.2 5.6
Temperature (°C)
Input Voltage (V)
EN Threshold vs. Input Voltage
EN Threshold vs. Temperature
0.70
0.65
0.60
0.55
0.50
0.45
0.40
0.35
0.30
1.00
0.80
0.60
0.40
0.20
0.00
EN_H
EN_L
EN_H
EN_L
VIN = 5V
100 125
1.2 1.6
2
2.4 2.8 3.2 3.6
4
4.4 4.8 5.2 5.6
-50
-25
0
25
50
75
Temperature (°C)
Input Voltage (V)
Dropout Voltage vs. Temperature
Dropout Voltage vs. Output Current
0.40
0.35
0.30
0.25
0.20
0.15
0.10
0.05
0.00
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
VOUT = 3.3V
VOUT = 0.9V
ILOAD = 100mA
TA = 125°C
TA = 85°C
TA = 25°C
TA = −40°C
ILOAD = 50mA
ILOAD = 20mA
-50
-25
0
25
50
75
100
125
0
50
100
150
200
250
Temperature (°C)
Output Current (mA)
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DS9073-06 June 2017
RT9073
Dropout Voltage vs. Output Current
Dropout Voltage vs. Output Current
1.2
1.0
0.8
0.6
0.4
0.2
0.0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
VOUT = 1.5V
VOUT = 2.5V
TA = 125°C
TA = 85°C
TA = 25°C
TA = −40°C
TA = 125°C
TA = 85°C
TA = 25°C
TA = −40°C
0
50
100
150
200
250
0
50
100
150
200
250
Output Current (mA)
Output Current (mA)
Current Limit vs. Temperature
Fold-Back Current Limit vs. Temperature
530
480
430
380
330
280
420
370
320
270
220
VIN = 5V
VIN = 5V
V
= 0.9V
= 3.3V
OUT
V
OUT
= 0.9V
V
OUT
V
= 3.3V
75
OUT
-50
-25
0
25
50
100
125
-50
-25
0
25
50
75
100
125
Temperature (°C)
Temperature (°C)
Ground Current vs. Load Current
SNS Input Current vs. Temperature
200
150
100
50
700
600
500
400
VIN = 5V
V
V
= 0.9V
= 3.3V
OUT
OUT
TA = −40°C
TA = 25°C
TA = 125°C
VIN = 5V
100 125
0
0.01
0.1
1
10
100
1000
10000
-50
-25
0
25
50
75
Load Current (mA)
Temperature (°C)
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RT9073
Power On from EN
Power Off from EN
VIN
(2V/Div)
VIN
(2V/Div)
VEN
(2V/Div)
VEN
(2V/Div)
VOUT
(2V/Div)
VOUT
(2V/Div)
ILOAD
(100mA/Div)
ILOAD
(100mA/Div)
VIN = 5V
VIN = 5V
Time (50μs/Div)
Time (25μs/Div)
Load Transient
Line Transient
VIN
(200mV/Div)
VIN
(2V/Div)
VOUT
(5mV/Div)
ILOAD
(100mA/Div)
VIN = 5V, VOUT = 3.3V, ILOAD = 10mA to 250mA
VIN = 2.4V to 5.5V, VOUT = 0.9V, ILOAD = 10mA
Time (250μs/Div)
Time (250μs/Div)
PSRR vs. Frequency
Output Noise
0
-20
-40
-60
-80
300
270
240
210
180
150
120
90
VIN = 2.9V, VOUT = 0.9V, ILOAD = 100mA
OUT = 1μF, f = 10Hz to 100kHz
C
VIN = 3.5V, ILOAD = 150mA
VIN = 3V, ILOAD = 50mA
VIN = 3.5V, ILOAD = 50mA
60
30
0
-30
-60
-90
-120
-150
-180
-210
-240
-270
-300
-100
10
100
1000
10000
100000 1000000
0
1
2
3
4
5
6
7
8
9
10
Frequency (Hz)
sec (m)
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DS9073-06 June 2017
RT9073
Application Information
Like any low dropout linear regulator, the RT9073’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 VINandGND
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.
temperature coefficient in Figure 4 is still perfect in such
kind of application.
Output Voltage vs. Temperature
3.30
3.29
3.28
3.27
ILOAD = 1mA
3.26
3.25
3.24
3.23
3.22
3.21
3.20
Enable
The RT9073 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.
-50
-25
0
25
50
75
100
125
Temperature (°C)
Figure 4. Temperature Coefficient ofAdjustable 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.
Adjustable Output Voltage Setting
Because of the small input current at the SNS pin, the
RT9073 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.
RT9073
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 :
VIN
EN
VOUT
SNS
1µF
R1
1µF
56pF/NC
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 :
R1 + R2
VOUT
VSNS
(1)
R2
where VSNS is determined by the output voltage selections
in the ordering information of RT9073.
When we choose 39kΩ and 15kΩ as R1 and R2
respectively, and select a 0.9V output at SNS pin, the
adjustable output voltage will be set to around 3.24V. Its
VOUT VSNS + ISNS R1
(2)
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RT9073
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
RT9073.
The maximum power dissipation depends on the operating
ambient temperature for fixed TJ(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
0.8
Four-Layer PCB
The RT9073 contains an independent current limiter, which
monitors and controls the pass transistor's gate voltage,
limiting the output current to 0.35A (typ.). The current
limiting level is reduced to around 250mAnamed fold-back
current limit when the output voltage is further decreased.
The output can be shorted to ground indefinitely without
damaging the part.
0.6
SOT-23-5
0.4
SC-70-5
0.2
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 :
0.0
0
25
50
75
100
125
Ambient Temperature (°C)
Figure 6. Derating Curve of Maximum PowerDissipation
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 SOT-23-5
package, the thermal resistance, θJA, is 218.1°C/W on a
standard JEDEC 51-7 four-layer thermal test board. For
SC-70-5 package, the thermal resistance, θJA, is 342.3°C/
Won 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) / (218.1°CW) = 0.45W for
SOT-23-5 package
PD(MAX) = (125°C − 25°C) / (342.3°CW) = 0.29W for
SC-70-5 package
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DS9073-06 June 2017
RT9073
Outline Dimension
H
D
L
B
C
A
b
A1
e
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.889
0.000
1.397
0.356
2.591
2.692
0.838
0.080
0.300
1.295
0.152
1.803
0.559
2.997
3.099
1.041
0.254
0.610
0.035
0.000
0.055
0.014
0.102
0.106
0.033
0.003
0.012
0.051
0.006
0.071
0.022
0.118
0.122
0.041
0.010
0.024
b
C
D
e
H
L
SOT-23-5 Surface Mount Package
Copyright 2017 Richtek Technology Corporation. All rights reserved.
©
is a registered trademark of Richtek Technology Corporation.
DS9073-06 June 2017
www.richtek.com
13
RT9073
H
D
L
B
C
A
b
A1
e
Dimensions In Millimeters
Dimensions In Inches
Symbol
Min
Max
Min
Max
A
A1
B
0.800
0.000
1.150
0.150
1.800
1.800
1.100
0.100
1.350
0.400
2.450
2.250
0.031
0.000
0.045
0.006
0.071
0.071
0.044
0.004
0.054
0.016
0.096
0.089
b
C
D
e
0.650
0.026
H
L
0.080
0.210
0.260
0.460
0.003
0.008
0.010
0.018
SC-70-5 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. 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
DS9073-06 June 2017
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