Richtek RT9073A-XXGQZ, RT9073A-XXGY Schematic [ru]

®
μμ
1
μA IQ, 250mA Low-Dropout Linear Regulator
μμ
RT9073A
General Description
The RT9073A 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.
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 RT9073A 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).
Ordering Information
RT9073A-
Package Type QZ : ZQFN-4L 1x1 (Z-Type) (ZDFN-4L 1x1) Y : SC-82
Lead Plating System G : Green (Halogen Free and Pb Free)
Output Voltage
09 : 0.9V
1K : 1.05V
12 : 1.2V
15 : 1.5V
18 : 1.8V
19 : 1.9V
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
Features
μμ

1
μA Ground Current at no Load

μμ

PSRR = 75dB at 1kHz

±±

±2% Output Accuracy

±±

250mA (V


Low (0.1


1.2V to 5.5V Operating Input Voltage


Dropout Voltage : 0.5V at 250mA when V


Support Fixed Output V oltage 0.9V , 1.05V , 1.2V , 1.5V,

≥≥
2.3V) Output Current with EN
≥≥
IN
μμ
μA) Disable Current
μμ
OUT
≥≥
3V
≥≥
1.8V, 1.9V, 2.5V, 2.7V, 2.8V, 2.9V, 3V, 3.3V

Stable with Ceramic or Tantalum Capacitor


Current Limit Protection


Over Temperature Protection


ZQFN-4L 1x1 (ZDFN-4L 1x1), SC-82 Packages

Available
Applications
Portable, Battery Powered Equipment
Ultra Low Power Microcontrollers
Notebook computers
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 require-
ments of IPC/JEDEC J-STD-020.
Suitable for use in SnPb or Pb-free soldering processes.
Copyright 2015 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation.
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1
RT9073A
Pin Configurations
1
VOUT VIN
SGND
GND EN
2
ZQFN-4L 1x1 (ZDFN-4L 1x1)
Functional Pin Description
4
5
3
(TOP VIEW)
VIN
VOUT
4
EN
3
2
GND
SC-82 (SSOT-24)
Pin No.
ZQFN-4L 1x1 (ZDFN-4L 1x1) SC-82 (SSOT-24)
1 3 VOUT Output of the Regulator.
2 2 GND Ground.
3 1 EN Enable Control Input.
4 4 VIN Supply Voltage Input.
5 (Exposed Pad) -- SGND Substrate of Chip. Leave floating or tie to GND.
Pin Name Pin Function
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2
Function Block Diagram
RT9073A
VIN
GND
EN
Bandgap
Reference
Current/Thermal
Sense
Operation
Basic operation
The RT9073A 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.
Output Tra nsistor
The RT9073A 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.
VOUT
+
-
R1
R2
Current Limit Protection
The RT9073A 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.), 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.
Enable
The RT9073A 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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3
RT9073A
Absolute Maximum Ratings (Note 1)
VIN, VOUT, EN to GND--------------------------------------------------------------------------------------------------- 0.3V to 6.5V
VOUT to VIN ---------------------------------------------------------------------------------------------------------------- 6.5V to 0.3V
Power Dissipation, P
ZQFN-4L 1x1 (ZDFN-4L 1x1) -------------------------------------------------------------------------------------------- 1.07W
SC-82 ------------------------------------------------------------------------------------------------------------------------ 0.28W
Package Thermal Resistance (Note 2)
ZQFN-4L 1x1 (ZDFN-4L 1x1), θJA-------------------------------------------------------------------------------------- 92.7°C/W
ZQFN-4L 1x1 (ZDFN-4L 1x1), θJC------------------------------------------------------------------------------------- 62.3°C/W
SC-82, θJA------------------------------------------------------------------------------------------------------------------- 345.6°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
@ TA = 25°C
D
Recommended Operating Conditions
Input Voltage, VIN --------------------------------------------------------------------------------------------------------- 1.2V to 5.5V
Junction Temperature Range -------------------------------------------------------------------------------------------- 40°C to 125°C
Ambient Temperature Range -------------------------------------------------------------------------------------------- 40°C to 85°C
(Note 4)
Electrical Characteristics
(V
+ 1 < VIN < 5.5V, TA = 25°C, unless otherwise specified)
OUT
Parameter Symbol Test Conditions Min Typ Max Unit
Output Voltage Range V
DC Output Accuracy I
Dropout Voltage (I
= 50mA)
LOAD
(Note 5)
Dropout Voltage (I
LOAD
=
250mA) (Note 5)
VCC Consumption Current IQ I
0.9 -- 3.3 V
OUT
= 1mA 2 -- 2 %
LOAD
1.2V -- 0.5 0.65
OUT
1.5V -- 0.3 0.4
OUT
1.8V -- 0.2 0.24
OUT
2.5V -- 0.15 0.18
OUT
3V -- 0.1 0.15
OUT
-- 0.08 0.12
OUT
1.2V -- 1.25 1.45
OUT
1.5V -- 1 1.2
OUT
1.8V -- 0.81 0.9
OUT
2.5V -- 0.68 0.8
OUT
3V -- 0.51 0.6
OUT
-- 0.45 0.6
OUT
5.5V -- 1 3 A
OUT
V
DROP
V
DROP
0.9V V
1.2V V
1.5V V
1.8V V
2.5V V
3V V
0.9V V
1.2V V
1.5V V
1.8V V
2.5V V
3V V
= 0mA, V
LOAD
V
V
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RT9073A
Parameter Symbol Test Conditions Min Typ Max Unit
Shutdown GND Current
Shutdown Leakage Current
V
EN Input Current IEN V
Line Regulation LINE I
VEN = 0V -- 0.1 0.5 A
= 0V, V
EN
= 5.5V -- -- 0.1 A
EN
= 10mA
LOAD
Load Regulation LOAD 1mA < I
Power Supply Rejection Ratio
Output Voltage Noise
PSRR
VIN = 3V, I
= 1F, V
C
OUT
= 1F,
C
OUT
I
= 30mA,
LOAD
BW = 10Hz to 100kHz, V
= V
IN
OUT
Output Current Limit I
Fold-Back Current Limit V
Enable Input Voltage
Logic-High V
Logic-Low VIL V
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
Peak output current 260 350 500 mA
LIM
= 0.5 x V
OUT
V
IH
T
I
SD
-- 20 -- C
T
SD
= 5V 1.2 -- --
IN
= 5V -- -- 0.4
IN
= 30mA, VIN 1.5V -- 150 -- C
LOAD
= 0V -- 0.1 0.5 A
OUT
1.2V V
1.5V -- -- 0.6
IN
1.5V VIN 1.8V -- -- 0.3
1.8V VIN 2.1V -- -- 0.1
2.1V VIN 5.5V -- -- 0.15
< 200mA -- -- 1 %
LOAD
= 50mA,
LOAD
+ 2V
= 2.5V, f = 1kHz
OUT
= 0.9V -- 39 --
V
OUT
V
= 1.2V -- 46 --
OUT
V
= 1.8V -- 48 --
OUT
V
= 3.3V -- 58 --
OUT
OUT(normal)
190 270 350 mA
-- 75 -- dB
V
%
RMS
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. θ
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 V
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is measured at T
JA
measured at the exposed pad of the package.
©
= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7. θJC is
A
IN
V
, when V
OUT
is 98% of the normal value of V
OUT
OUT
.
5
RT9073A
Typical Application Circuit
V
IN
EN
C
IN
1µF
RT9073A
4
VIN
3
EN
GND
2
VOUT
1
C
1µF
OUT
V
OUT
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Typical Operating Characteristics
)
)
RT9073A
Output Voltage vs. Te mperature
3.32
3.31
3.30
3.29
3.28
3.27
Output Voltage (V)
3.26
3.25
-50 -25 0 25 50 75 100 125
I
LOAD
I
LOAD
= 1mA
= 250mA
VIN = 5V, V
Temperature (°C)
Output Volta ge vs. Inp ut Voltage
0.904
0.902
0.900
0.898
OUT
= 3.3V
Output Voltage vs. Te mperature
0.91
0.90
I
= 1mA
0.89
0.88
LOAD
I
LOAD
= 250mA
Output Voltage (V)
0.87
0.86
-50 -25 0 25 50 75 100 125
VIN = 5V, V
Temperature (°C)
Output Voltage vs. Output Current
3.33
3.32
3.31
OUT
= 0.9V
Outout Voltage (V)
0.896
0.894
0.892
V
= 0.9V, I
0.890
OUT
11.522.53 3.544.555.5
LOAD
Input Voltage (V)
Ground Current vs. Input Voltage
2.1
1.8
1.5
1.2
0.9
0.6
Ground Current (μA
0.3
V
0
11.522.53 3.544.555.5
Input Voltage (V)
OUT
= 1mA
= 0.9V
3.3
Output Voltage (V)
3.29
VIN = 5V, V
3.28 0 30 60 90 120 150 180 210 240
Output Current (mA)
Ground Current vs. Temperature
1.5
1.4
1.3
1.2
1.1
1
Ground Current (μA
0.9
VIN = 5V, V
0.8
-50 -25 0 25 50 75 100 125
Temperature (°C)
OUT
OUT
= 3.3V
= 3.3V
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RT9073A
Shutdown Current vs. Input Voltage
0.50
0.45
0.40
0.35
0.30
0.25
0.20
0.15
0.10
Shutdown Current (μA) 1
0.05
0.00
1.2 1.6 2 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6
Input Voltage (V)
V
= 0.9V, VEN = 0V
OUT
EN Threshold vs. Input Voltage
0.70
0.65
0.60
0.55
0.50
0.45
EN Threshold (V)
0.40
0.35
0.30
1.2 1.6 2 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 5.6
EN_H
EN_L
Input Voltage (V)
Shutdown Current vs. Temperature
0.30
0.25
0.20
0.15
0.10
V
Shutdown Current (μA) 1
0.05
0.00
-50 -25 0 25 50 75 100 125
IN
V
IN
Temperature (°C)
EN Threshold vs. Temperature
1.00
0.80
EN_H
0.60
0.40
EN Threshold (V)
0.20
0.00
-50 -25 0 25 50 75 100 125
Temperature (°C)
EN_L
VEN = 0V
= 5V
= 3.5V
VIN = 5V
Dropout Voltage vs. Temperature
0.40
VIN = 3.3V
0.35
0.30
0.25
0.20
0.15
0.10
Dropout Voltage (V)
0.05
0.00
-50 -25 0 25 50 75 100 125
Temperature (°C)
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I
LOAD
I
I
LOAD
LOAD
= 100mA
= 50mA
Dropout Voltage (V)
= 20mA
Dropout Voltage vs . Output Current
1.6
V
= 0.9V
OUT
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0 0 50 100 150 200 250
Output Current (mA)
TA = 125°C
= 85°C
T
A
T
= 25°C
A
TA = −40°C
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8
RT9073A
)
Dropout Voltage vs . Output Current
1.4
V
= 1.5V
OUT
1.2
1.0
0.8
0.6
0.4
Dropout Voltage (V)
0.2
0.0 0 50 100 150 200 250
TA = 125°C
T
= 85°C
A
= 25°C
T
A
TA = −40°C
Output Current (mA)
Current Limit vs. Temperature
530
VIN = 5V
480
430
380
V
OUT
= 0.9V
Dropout Voltage vs. Output Current
1.2
V
= 2.5V
OUT
1.0
0.8
TA = 125°C
T
= 85°C
0.6
0.4
A
T
= 25°C
A
TA = −40°C
Dropout Voltage (V)
0.2
0.0 0 50 100 150 200 250
Output Current (mA)
Fold-Back Current Limit vs. Temperature
420
VIN = 5V
370
V
= 0.9V
OUT
320
V
= 3.3V
Current Limit (mA)
330
V
OUT
= 3.3V
270
OUT
Fold-Back Current Limit (mA
280
-50 -25 0 25 50 75 100 125
Temperature (°C)
Ground Current vs. Load Current
200
VIN = 5V
150
100
TA = −40°C
TA = 25°C
= 125°C
T
GND Current (μA)
50
0
0.01 0.1 1 10 100 1000 10000
Load Current (mA)
A
(100mA/Div)
V
(2V/Div)
V
EN
(2V/Div)
V
OUT
(2V/Div)
I
LOAD
220
-50 -25 0 25 50 75 100 125
Temperature (°C)
Power On from EN
IN
V
Time (50μs/Div)
IN
= 5V
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RT9073A
V
IN
(2V/Div)
V
EN
(2V/Div)
V
OUT
(2V/Div)
I
LOAD
(100mA/Div)
V
IN
(200mV/Div)
Power Off from EN
Time (25μs/Div)
Load Transient
Line Transient
V
IN
(2V/Div)
V
OUT
(5mV/Div)
V
IN
= 5V
V
= 2.4V to 5.5V, V
IN
OUT
= 0.9V, I
LOAD
= 10mA
Time (250μs/Div)
PSRR vs. Frequency
0
V
-20
-40
IN
V
IN
V
IN
= 3.5V, I
= 3V, I
= 3.5V, I
LOAD
LOAD
LOAD
= 150mA
= 50mA
= 50mA
I
LOAD
(100mA/Div)
300 270 240 210 180 150 120
90 60 30
-30
-60
Noise(μV)
-90
-120
-150
-180
-210
-240
-270
-300
V
= 5V, V
IN
OUT
= 3.3V, I
= 10mA to 250mA
LOAD
Time (250μs/Div)
Output Noise
Output Noise
V
= 2.9V, V
IN
= 1μF, f = 10Hz to 100kHz
C
OUT
0
012345678910
OUT
= 0.9V, I
LOAD
= 100mA
sec (m)
-60
PSRR (dB)
-80
V
= 2.5V, C
-100
OUT
10 100 1000 10000 100000 1000000
OUT
Frequency (Hz)
Output Noise
Output Noise
300
V
= 5.3V, V
IN
270 240
C
= 1μF, f = 10Hz to 100kHz
OUT
210 180 150 120
90 60 30
0
-30
-60
Noise(μV)
-90
-120
-150
-180
-210
-240
-270
-300 012345678910
OUT
= 3.3V, I
LOAD
= 100mA
sec (m)
= 2.2μF
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Application Information
RT9073A
Like any low dropout linear regulator, the RT9073A’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) 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.
Enable
The RT9073A 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.
Current Limit
The RT9073A 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 250mA named
fold-back current limit when the output voltage is further
decreased. 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 :
resistance, θJA, is layout dependent. For ZQFN-4L 1x1
(ZDFN-4L 1x1) package, the thermal resistance, θJA, is
92.7°C/W on a standard JEDEC 51-7 four-layer thermal
test board. For SC-82 (SSOT-24) package, the thermal
resistance, θJA, is 345.6°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 :
P
= (125°C − 25°C) / (92.7°C/W) = 1.07W for
D(MAX)
ZQFN-4L 1x1 (ZDFN-4L 1x1) package
P
= (125°C − 25°C) / (345.6°C/W) = 0.28W for
D(MAX)
SC-82 (SSOT-24) package
The maximum power dissipation depends on the operating
ambient temperature for fixed T
and thermal
J(MAX)
resistance, θJA. The derating curve in Figure 1 allows the
designer to see the effect of rising ambient temperature
on the maximum power dissipation.
1.6
1.2
ZQFN-4L 1x1 (ZDFN-4L 1x1)
0.8
0.4
Maximum Power Dissipation (W) 1
SC-82 (SSOT-24)
0.0 0 25 50 75 100 125
Ambient Temperature (°C)
Four-Layer PCB
Figure 1. Derating Curve of Maximum Power Dissipation
P
where T
the ambient temperature, and θ
D(MAX)
= (T
J(MAX)
TA) / θ
J(MAX)
JA
is the maximum junction temperature, T
is the junction to ambient
JA
is
A
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
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11
RT9073A
Outline Dimension
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.
Dimensions In Millimeters Dimensions In Inches
Symbol
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
1
2
DETAIL A
1
2
e
0.625 0.025
L 0.200 0.300 0.008 0.012
H
H1
0.039 0.002
0.064 0.003
Z-Type 4L QFN 1x1 Package
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RT9073A
D
e
C
b
A
e
B
b1
A1
H
L
Dimensions In Millimeters Dimensions In Inches
Symbol
Min Max Min Max
A 0.800 1.100 0.031 0.043
A1 0.000 0.100 0.000 0.004
B 1.150 1.350 0.045 0.053
b 0.150 0.400 0.006 0.016
b1 0.350 0.500 0.014 0.020
C 1.800 2.450 0.071 0.096
D 1.800 2.200 0.071 0.087
e 1.300 0.051
H 0.080 0.260 0.003 0.010
L 0.200 0.460 0.008 0.018
SC-82 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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