®
RT9020
500mA, Low Dropout, Low Noise Ultra-Fast With Soft Start
CMOS LDO Regulator
General Description
The RT9020 is a high-performance, 500mA LDO regulator,
offering extremely high PSRR and ultra-low dropout, ideal
for portable RF and wireless applications with demanding
performance and space requirements.
The RT9020 quiescent current is as low as 25μA, further
prolonging the battery life. The RT9020 also works with
low-ESR ceramic capacitors, reducing the amount of board
space necessary for power applications, critical in hand-
held wireless devices.
The RT9020 consumes typical 0.7μA in shutdown mode
and has fast turn-on time less than 70μs (without C
SS
).
The other features include ultra-low dropout voltage, high
output accuracy, current limiting protection, and high ripple
rejection ratio. Tiny packages SOT-23-5 and SC-70-5 are
available.
Features
Wide Operating Voltage Ranges : 2.2V to 5.5V
Low Dropout : 250mV at 500mA
5mA Discharge Current of V
OUT
when IC Shutdown
Ultra-Low-Noise for DSC Application
Ultra-Fast Response in Line/Load Transient
Current Limiting Protection
Thermal Shutdown Protection
High Power Supply Rejection Ratio
μ
Output Only 1μF Capacitor Required for Stability
TTL-Logic-Controlled Shutdown Input
RoHS Compliant and 100% Lead (Pb)-Free
Moisture Sensitivity Level : Level 3
Applications
Digital Still Camera
CDMA/GSM Cellular Handsets
Portable Information Appliances
Laptop, Palmtops, Notebook Computers
Mini PCI & PCI-Express Cards
PCMCIA & New Cards
Ordering Information
RT9020
-
Package Type
B : SOT-23-5
U5 : SC-70-5
Lead Plating System
P : Pb Free
G : Green (Halogen Free and Pb Free)
Fixed Output Voltage
12 : 1.2V
15 : 1.5V
16 : 1.6V
:
32 : 3.2V
33 : 3.3V
1B : 1.25V
1H : 1.85V
2H : 2.85V
Note :
Richtek products are :
½
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
Pin Configuration
TOP VIEW
VOUT
5
2
SS
4
3
VIN GND EN
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.
SOT-23-5 / SC-70-5
½
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9020-07 July 2017
www.richtek.com
1
RT9020
Typical Application Circuit
V
IN
VIN
C
IN
1uF/
X7R
VOUT
C
OUT
1uF/
X7R
V
OUT
RT9020
EN
GND
SS
Chip Enable
C
SS
0.5nF
Functional Pin Description
Pin Number
1
2
3
4
5
Pin Name
VIN
GND
EN
SS
VOUT
Supply input.
Common ground.
Enable input logic, active high. When the EN goes to a logic low, the device will
be shutdown.
Soft start.
Regulator output.
Pin Function
Functional Block Diagram
SS
EN
1µA
POR
OTP
V
REF
Current
Limit
VIN
-
+
MOS
Driver
VOUT
GND
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
2
DS9020-07 July 2017
RT9020
Absolute Maximum Ratings
(Note 1)
6V
6V
0.4W
0.3W
250°C/W
Supply Input Voltage ------------------------------------------------------------------------------------------------------
EN Input Voltage -----------------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
SOT-23-5 --------------------------------------------------------------------------------------------------------------------
SC-70-5 ----------------------------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 2)
SOT-23-5,
θ
JA
---------------------------------------------------------------------------------------------------------------
SC-70-5,
θ
JA
---------------------------------------------------------------------------------------------------------------- 333°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)
Supply Input Voltage ------------------------------------------------------------------------------------------------------ 2.2V to 5.5V
Junction Temperature Range --------------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------------
−40°C
to 85°C
Electrical Characteristics
(V
IN
= V
OUT
+ 0.5V, V
EN
= V
IN
, C
IN
= C
OUT
= 1μF (Ceramic), T
A
= 25°C unless otherwise specified)
Parameter
Input Voltage Range
Output Noise Voltage
Output Voltage Accuracy
(Fixed Output Voltage)
Quiescent Current
Standby Current
Current Limit
Dropout Voltage
(Note 6)
(Note 5)
Symbol
V
IN
V
ON
V
OUT
I
Q
I
STBY
I
LIM
V
DROP
Test Conditions
V
OUT
= 1.5V, C
OUT
= 1F, I
OUT
=
0mA, C
SS
= 1nF
I
OUT
= 10mA
V
EN
= 5V, I
OUT
= 0mA
V
EN
= 0V
R
LOAD
= 0, 2.2V
V
IN
< 2.6V
R
LOAD
= 0, 2.7V
V
IN
5.5V
I
OUT
= 400mA, 2.2V
V
IN
< 2.7V
I
OUT
= 500mA, 2.7V
V
IN
5.5V
1mA < I
OUT
< 400mA
2.2V
V
IN
< 2.7V
1mA < I
OUT
< 500mA
2.7V
V
IN
5.5V
V
OUT
= 2.5V, C
SS
= 1nF
Min
2.2
--
2
--
--
0.4
0.5
--
--
--
--
--
Typ
--
40
0
25
0.7
0.7
0.8
160
250
--
--
0.7
Max
5.5
--
+2
50
1.5
1.05
1.05
320
400
0.6
Unit
V
V
RMS
%
A
A
A
mV
Load Regulation (Note 7)
(Fixed Output Voltage)
Soft Start Time
V
LOAD
%
1
1
ms
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9020-07 July 2017
www.richtek.com
3
RT9020
Parameter
EN Threshold
Symbol
Test Conditions
Min
0
1.6
0.1
I
OUT
= 10mA
V
IN
= (V
OUT
+0.5) to 5.5V,
I
OUT
= 1mA
--
--
--
--
Typ
--
--
1
55
0.01
170
30
Max
0.6
5.5
5
--
0.2
--
--
Unit
V
A
dB
%/V
C
Logic-Low Voltage V
IL
Logic-High Voltage V
IH
I
EN
PSRR
V
LINE
T
SD
T
SD
Enable Pin Current
Power Supply
Rejection Rate
Line Regulation
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
f = 10kHz
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 at T
A
= 25°C on a low effective thermal conductivity single-layer test board per JEDEC 51-3.
Note 3.
Devices are ESD sensitive. Handling precaution recommended.
Note 4.
The device is not guaranteed to function outside its operating conditions.
Note 5.
Quiescent, or ground current, is the difference between input and output currents. It is defined by I
Q
= I
IN
- I
OUT
under no
load condition (I
OUT
= 0mA). The total current drawn from the supply is the sum of the load current plus the ground pin
current.
Note 6.
The dropout voltage is defined as V
IN
-V
OUT
, which is measured when V
OUT
is V
OUT(NORMAL)
- 100mV.
Note 7.
Regulation is measured at constant junction temperature by using a 2ms current pulse. Devices are tested for load
regulation in the load range from 10mA to 500mA.
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
4
DS9020-07 July 2017
RT9020
Typical Operating Characteristics
(C
IN
= C
OUT
= 1uF/X7R, C
SS
= 1nF, unless otherwise specified)
Output Voltage vs. Temperature
3.40
3.35
3.30
3.25
3.20
3.15
3.10
-50
-25
0
25
50
75
100
125
Dropout Voltage vs. Load Current
300
250
V
IN
= 5.0V
V
OUT
= 3.3V
T
J
= 125°C
Dropout Voltage (mV)
Output Voltage (V)
200
T
J
= 25°C
150
100
50
0
0
100
200
300
400
500
T
J
= -40°C
Temperature
(°C)
Load Current (mA)
Quiescent Current vs. Temperature
50
Soft Start Time
10000
10
V
IN
= 4.5V, V
OUT
= 3.3V
V
IN
= 5.0V, V
OUT
= 3.3V
Quiescent Current (uA)
(ms)
Soft Start Time (us)
40
8000
8
30
6000
6
20
4000
4
10
2000
2
0
-50
-25
0
25
50
75
100
125
0
0
1
2
3
4
5
6
7
8
9
10
Temperature
(°C)
C
ss
(nF)
Start Up
V
IN
= 4.5V, V
OUT
= 3.1V, C
SS
= 22nF, No Load
EN Pin Shutdown Response
V
IN
= 4.5V, V
OUT
= 3.3V, No Load
V
EN
(5V/Div)
V
EN
(5V/Div)
V
OUT
(1V/Div)
I
IN
(50mA/Div)
Time (10ms/Div)
V
OUT
(2V/Div)
I
IN
(50mA/Div)
Time (5ms/Div)
Copyright
©
2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS9020-07 July 2017
www.richtek.com
5
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