®
RT9073A
1μA I
Q
, 250mA Low-Dropout Linear Regulator
μ
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).
Features
μ
1μA Ground Current at no Load
PSRR = 75dB at 1kHz
±
2% Output Accuracy
250mA (V
IN
≥
2.3V) Output Current with EN
Low (0.1μA) Disable Current
μ
1.2V to 5.5V Operating Input Voltage
Dropout Voltage : 0.45V (typ.) at 250mA when V
OUT
≥
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
Over Temperature Protection
ZQFN-4L 1x1 (ZDFN-4L 1x1), SC-82 Packages
Available
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
Note :
Richtek products are :
½
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.
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.
is a registered trademark of Richtek Technology Corporation.
½
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
DS9073A-03 June 2017
www.richtek.com
1
RT9073A
Pin Configuration
(TOP VIEW)
VOUT
1
4
VIN
VIN
4
VOUT
3
2
SGND
GND
2
5
3
EN
EN
GND
ZQFN-4L 1x1 (ZDFN-4L 1x1)
SC-82 (SSOT-24)
Functional Pin Description
Pin No.
ZQFN-4L 1x1 (ZDFN-4L 1x1) SC-82 (SSOT-24)
1
2
3
4
5 (Exposed Pad)
3
2
1
4
--
Pin Name
VOUT
GND
EN
VIN
SGND
Pin Function
Output of the regulator.
Ground.
Enable control input.
Supply voltage input.
Substrate of chip. Leave floating or tie to GND.
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9073A-03 June 2017
RT9073A
Functional Block Diagram
VIN
GND
Current/Thermal
Sense
R1
-
+
VOUT
EN
Bandgap
Reference
R2
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.
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 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.
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.
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.), V
IN
≥
1.5V and the output current exceeds 30mA.
Once the junction temperature cools down by
approximately 20°C, the regulator will automatically
resume operation.
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9073A-03 June 2017
www.richtek.com
3
RT9073A
Absolute Maximum Ratings
(Note 1)
−0.3V
to 6.5V
−6.5V
to 0.3V
0.44W
0.28W
226°C/W
VIN, VOUT, EN to GND ---------------------------------------------------------------------------------------------------
VOUT to VIN ----------------------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
ZQFN-4L 1x1 (ZDFN-4L 1x1) --------------------------------------------------------------------------------------------
SC-82 ------------------------------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 2)
ZQFN-4L 1x1 (ZDFN-4L 1x1),
θ
JA
--------------------------------------------------------------------------------------
ZQFN-4L 1x1 (ZDFN-4L 1x1),
θ
JC
------------------------------------------------------------------------------------- 43°C/W
SC-82,
θ
JA
------------------------------------------------------------------------------------------------------------------- 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
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
(V
OUT
+ 1 < V
IN
< 5.5V, T
A
= 25°C, unless otherwise specified)
Parameter
Output Voltage Range
DC Output Accuracy
Symbol
V
OUT
Test Conditions
I
LOAD
= 1mA
0.9V
V
OUT
1.2V
1.2V
V
OUT
1.5V
1.5V
V
OUT
1.8V
1.8V
V
OUT
2.5V
2.5V
V
OUT
3V
3V
V
OUT
0.9V
V
OUT
1.2V
1.2V
V
OUT
1.5V
1.5V
V
OUT
1.8V
1.8V
V
OUT
2.5V
2.5V
V
OUT
3V
3V
V
OUT
I
LOAD
= 0mA, V
OUT
5.5V
V
IN
V
OUT
+ V
DROP
Min
0.9
2
--
--
--
--
--
--
--
--
--
--
--
--
--
Typ
--
--
0.5
0.3
0.2
0.15
0.1
0.08
1.25
1
0.81
0.68
0.51
0.45
1
Max
3.3
2
0.65
0.4
0.24
0.18
0.15
0.12
1.45
1.2
0.9
0.8
0.6
0.6
3
Unit
V
%
Dropout Voltage (I
LOAD
= 50mA)
(Note 5)
V
DROP
V
Dropout Voltage (I
LOAD
= 250mA)
(Note 5)
V
DROP
V
V
CC
Consumption Current
I
Q
A
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9073A-03 June 2017
RT9073A
Parameter
Shutdown GND Current
Shutdown Leakage
Current
EN Input Current
I
EN
Symbol
V
EN
= 0V
V
EN
= 0V, V
OUT
= 0V
V
EN
= 5.5V
1.2V
V
IN
1.5V
Line Regulation
LINE
I
LOAD
= 10mA
1.5V
V
IN
1.8V
1.8V
V
IN
2.1V
2.1V
V
IN
5.5V
Load Regulation
Power Supply Rejection
Ratio
LOAD
PSRR
1mA < I
LOAD
< 200mA
V
IN
= 3V, I
LOAD
= 50mA,
C
OUT
= 1F, V
OUT
= 2.5V, f = 1kHz
C
OUT
= 1F,
I
LOAD
= 30mA,
BW = 10Hz to
100kHz,
V
IN
= V
OUT
+ 2V
I
LIM
V
IH
V
IL
T
SD
T
SD
Peak output current
V
OUT
= 0.5 x V
OUT(normal)
V
IN
= 5V
V
IN
= 5V
I
LOAD
= 30mA, V
IN
1.5V
V
OUT
= 0.9V
V
OUT
= 1.2V
V
OUT
= 1.8V
V
OUT
= 3.3V
Test Conditions
Min
--
--
--
--
--
--
--
--
--
--
--
--
--
260
190
1.2
--
--
--
Typ
0.1
0.1
--
--
--
--
--
--
75
39
46
48
58
350
270
--
--
150
20
Max
0.5
0.5
0.1
0.6
0.3
0.1
0.15
1
--
--
--
--
--
500
350
--
0.4
--
--
mA
mA
V
C
C
V
RMS
%
dB
%
Unit
A
A
A
Output Voltage Noise
Output Current Limit
Fold-Back Current Limit
Enable Input
Voltage
Logic-High
Logic-Low
Thermal Shutdown
Temperature
Thermal Shutdown
Hysteresis
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
JA
is measured in the natural convection at T
A
= 25°C on a two-layer Richtek Evaluation Board for ZQFN-4L 1x1 (ZDFN-
4L 1x1) Package.
θ
JA
is measured at T
A
= 25°C on a high effective thermal conductivity four-layer test board per JEDEC 51-7 for SC-82
Package.
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
IN
−
V
OUT
, when V
OUT
is 98% of the normal value of V
OUT
.
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9073A-03 June 2017
www.richtek.com
5
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