RT9050
300mA, 0.5% Accuracy Low Dropout, Ultra Low Noise
Voltage Regulator
General Description
The RT9050 is a high-performance, 300mA LDO regulator,
offering extremely high PSRR and ultra-low dropout. The
RT9050 is Ideal for portable RF and wireless applications
with demanding performance and space requirements.
The RT9050 provides quiescent current to be as low as
25μA to extend the battery life. The RT9050 also works
with low-ESR ceramic capacitors, reducing the amount of
board space necessary for power applications, especially
for hand-held wireless devices.
The RT9050 consumes typical 0.7μA in shutdown mode
and has fast turn-on time to be less than 40μs. The other
features include ultra-low dropout voltage, high output
accuracy, current limiting protection, and high ripple
rejection ratio. The RT9050 is available in the SOT-23-5
package.
Features
Wide Operating Voltage Range : 3.8V to 5.5V
Low Dropout : 150mV at 300mA
Ultra-Low-Noise without Bypass Capacitor
Ultra-Fast in Line/Load Transient Response
Current Limit Protection
Thermal Shutdown Protection
High Power Supply Rejection Ratio
Only 1μF Output Capacitor Required for Stability
μ
TTL-Logic-Controlled Shutdown Input
RoHS Compliant and Haloge Free
Applications
CDMA/GSM Cellular Handsets
Portable Information Appliances
Laptop, Palmtops, Notebook Computers
Hand-Held Instruments
Mini PCI & PCI-Express Cards
PCMCIA & New Cards
Ordering Information
RT9050
-
Package Type
B : SOT-23-5
Lead Plating System
G : Green (Halogen Free and Pb Free)
Fixed Output Voltage
33 : 3.3V
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.
Pin Configurations
(TOP VIEW)
VOUT
5
2
NC
4
3
VIN GND EN
SOT-23-5
Typical Application Circuit
V
IN
C
IN
1µF/X7R
VIN
VOUT
V
OUT
C
OUT
1µF/X7R
Marking Information
For marking information, contact our sales representative
directly or through a Richtek distributor located in your
area.
RT9050
EN
GND
Chip Enable
R
pull_down
100k
DS9050-01 April 2011
www.richtek.com
1
RT9050
Functional Pin Description
Pin No.
1
2
3
4
5
Pin Name
VIN
GND
EN
NC
VOUT
Power Supply Input.
Ground Pin.
Chip Enable (Active High). It is recommended to add a 100kΩ resistor between the EN
and GND.
No Internal Connection.
Regulator Output.
Pin Function
Function Block Diagram
POR
OTP
V
REF
Current
Limit
VIN
-
+
EN
MOS
Driver
VOUT
GND
Absolute Maximum Ratings
(Note 1)
6V
6V
0.4W
250°C/W
260°C
150°C
−
65°C to 150°C
2kV
200V
Supply Input Voltage ------------------------------------------------------------------------------------------------------
EN Input Voltage -----------------------------------------------------------------------------------------------------------
Power Dissipation, P
D
@ T
A
= 25°C
SOT-23-5 --------------------------------------------------------------------------------------------------------------------
Package Thermal Resistance (Note 2)
SOT-23-5,
θ
JA
---------------------------------------------------------------------------------------------------------------
Lead Temperature (Soldering, 10 sec.) -------------------------------------------------------------------------------
Junction Temperature -----------------------------------------------------------------------------------------------------
Storage Temperature Range --------------------------------------------------------------------------------------------
ESD Susceptibility (Note 3)
HBM --------------------------------------------------------------------------------------------------------------------------
MM ----------------------------------------------------------------------------------------------------------------------------
Recommended Operating Conditions
(Note 4)
Supply Input Voltage ------------------------------------------------------------------------------------------------------ 3.8V to 5.5V
Junction Temperature Range --------------------------------------------------------------------------------------------
−40°C
to 125°C
Ambient Temperature Range --------------------------------------------------------------------------------------------
−40°C
to 85°C
www.richtek.com
2
DS9050-01 April 2011
RT9050
Electrical Characteristics
(V
IN
= V
OUT
+ 0.5V, V
EN
= V
IN
, C
IN
= C
OUT
= 1μF/X7R (Ceramic), T
A
= 25°C, unless otherwise specified)
Parameter
Output Noise Voltage
Output Voltage Accuracy
Quiescent Current
Shutdown Current
Current Limit
Dropout Voltage
Load Regulation
EN Threshold
(Note 6)
(Note 7)
(Note 5)
Symbol
V
ON
ΔV
OUT
I
Q
I
SHDN
I
LIM
V
DROP
ΔV
LOAD
Test Conditions
1mA
≤
I
OUT
≤
150mA, T
J
= 25°C
I
OUT
= 0mA
V
EN
= 0V
R
LOAD
= 0Ω
I
OUT
= 300mA
1mA < I
OUT
< 300mA
Min
--
−0.5
--
--
300
--
--
0
1.6
--
Typ
30
0
25
0.7
400
125
--
--
--
0.1
−50
0.01
170
30
Max
--
+0.5
50
1.5
600
240
1
0.6
5.5
1
--
0.2
--
--
Unit
μV
RMS
%
μA
μA
mA
mV
%
V
μA
dB
%/V
°C
Logic-Low Voltage V
IL
Logic-High Voltage V
IH
I
EN
PSRR
ΔV
LINE
T
SD
ΔT
SD
I
OUT
= 100mA, f = 10kHz
V
IN
= (V
OUT
+ 0.5V) to 5.5V,
I
OUT
= 1mA
Enable Pin Current
Power Supply Rejection Rate
Line Regulation
Thermal Shutdown Temperature
Thermal Shutdown Hysteresis
--
--
--
--
Note 1.
Stresses listed as the above
“Absolute
Maximum Ratings” may cause permanent damage to the device. These are for
stress ratings. 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 for extended periods may
remain possibility to affect device reliability.
Note 2.
θ
JA
is measured in the natural convection at T
A
= 25°C on a low effective thermal conductivity single layer test board of
JEDEC 51-3 thermal measurement standard.
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.
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 300mA.
Note 8.
The output voltage variation is typical
±
0.5% within recommended operating temperature range.
DS9050-01 April 2011
www.richtek.com
3
RT9050
Typical Operating Characteristics
(C
IN
= C
OUT
= 1μ/X7R, unless otherwise specified)
Output Voltage vs. Temperature
3.34
3.33
30
28
Quiescent Current vs. Temperature
Output Voltage (V)
3.32
3.31
3.30
3.29
3.28
3.27
Quiescent Current (uA)
26
24
22
20
18
16
14
12
10
-50
-25
0
25
50
75
100
125
V
IN
= 4.2V, V
OUT
= 3.3V, I
OUT
= 0mA
3.26
-50
-25
0
25
50
75
100
125
V
IN
= 4.2V
Temperature (°C)
Temperature
(°C)
Dropout Voltage vs. Load Current
200
180
160
EN Pin Shutdown Response
EN Pin Voltage
(V)
V
IN
= 5V, V
OUT
= 3.3V, I
OUT
= 50mA
4
2
0
125°C
25°C
Dropout Voltage (mV)
140
120
100
80
60
40
20
0
0
50
100
150
200
Output Voltage
(V)
−40°C
4
2
0
V
OUT
= 3.3V
250
300
Time (100μs/Div)
Load Current (mA)
Start Up
EN Pin Voltage
(V)
Input Voltage
Deviation (V)
4
2
0
Line Transient Response
V
IN
= 3.6V to 4.6V, I
OUT
= 10mA
4.6
3.6
Output Voltage
(V)
4
2
0
V
IN
= 5V, V
OUT
= 3.3V, I
OUT
= 50mA
Output Voltage
Deviation (mV)
20
0
-20
Time (5μs/Div)
Time (100μs/Div)
www.richtek.com
4
DS9050-01 April 2011
RT9050
Line Transient Response
V
IN
= 3.6V to 4.6V, I
OUT
= 100mA
Noise
V
IN
= 4.5V (By Battery), No Load
300
Input Voltage
Deviation (V)
4.6
3.6
Noise (μV/Div)
200
100
0
-100
-200
-300
Output Voltage
Deviation (mV)
20
0
-20
Time (100μs/Div)
Time (10ms/Div)
Noise
V
IN
= 4.5V (By Battery), I
OUT
= 10mA
300
20
10
0
-10
PSRR
V
IN
= 4.1V to 4.2V
Noise (μV/Div)
200
PSRR(dB)
100
0
-100
-200
-300
-20
-30
-40
-50
-60
-70
I
OUT
= 100mA
I
OUT
= 10mA
10
100
1000
10000
100000
1000000
Time (10ms/Div)
Frequency (Hz)
Load Transient Response
V
IN
= 5V, V
OUT
= 3.3V, I
OUT
= 10mA to 100mA
Load Transient Response
V
IN
= 5V, V
OUT
= 3.3V, I
OUT
= 10mA to 300mA
Output Voltage Load Current
Deviation (mV)
(mA)
Load Current
(mA)
Output Voltage
Deviation (mV)
300
200
100
0
100
0
-100
100
50
0
50
0
-50
Time (100μs/Div)
Time (100μs/Div)
DS9050-01 April 2011
www.richtek.com
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
