WL2801E
WL2801E
Low noise, High PSRR, High speed, CMOS LDO
Http://www.willsemi.com
Descriptions
The WL2801E series is a high accuracy, low noise,
high speed, low dropout CMOS Linear regulator with
high ripple rejection. The devices offer a new level of
cost effective performance in cellular phones, laptop
and notebook computers, and other portable devices.
The current limiter's fold-back circuit also operates
as a short circuit protection and an output current
limiter at the output pin.
The WL2801E regulators are available in standard
SOT-23-5L packages. Standard products are Pb-free
and Halogen-free.
5
4
2
3
VOUT
NC
SOT-23-5L
Features
z
z
z
z
z
z
z
z
Input voltage
Output range
Output current
PSRR
Dropout voltage
: 2.7V~5.5V
: 1.2V~3.3V
: 200mA (Up to 300mA Typ.)
: 75dB @ 217Hz
: 170mV @ I
OUT
=200mA
1
VIN GND EN
Pin Configuration (Top View)
Quiescent current : 70 A Typ.
Shut-down current : < 0.1 A
Recommend capacitor : 1uF
****
Applications
z
z
z
z
MP3/MP4 Players
Cellphones, radiophone, digital cameras
Bluetooth, wireless handsets
Others portable electronics device
For detail marking information, please see page 9.
Marking
Order Information
For detail order information, please see page 9.
Will Semiconductor Ltd.
1
Dec. 2011 – Rev.3.0
WL2801E
Typical Application
Pin Description
PIN
VIN
1uF
1
2
3
ON
OFF
4
5
1uF
VOUT
1
2
3
4
5
Symbol
VIN
GND
EN
NC
VOUT
Description
Input
Ground
Enable (Active high)
Not connected
Output
Block Diagram
Will Semiconductor Ltd.
2
Dec. 2011 – Rev.3.0
WL2801E
Absolute Maximum Ratings
Parameter
Power Dissipation
V
IN
Range
V
EN
Range
V
OUT
Range
Lead Temperature Range
Storage Temperature Range
Operating Junction Temperature Range
Value
Internal limited
-0.3
-0.3
-0.3
260
-55 ~ 150
150
6.5
V
IN
V
IN
Unit
mW
V
V
V
o
o
o
C
C
C
Recommend Operating Ratings
Parameter
Operating Supply voltage
Operating Temperature Range
Thermal Resistance, R
JA
Value
2.7
250
5.5
-40 85
Unit
V
o
o
C
C/W
Electronics Characteristics
(Ta=25
o
C, V
IN
=V
OUT
+1V, C
IN
=C
OUT
=1uF, unless otherwise noted)
Parameter
Symbol
Condition
V
OUT
<2V, V
IN
=2.7V, I
OUT
=1mA
Output Voltage
V
OUT
V
OUT
Min.
0.97
V
OUT
0.98
V
OUT
Typ.
V
OUT
Max.
1.03
V
OUT
1.02
V
OUT
Unit
V
2V,
I
OUT
=1mA
V
OUT
Current
Limit
I
LIM
V
EN
=V
IN
V
OUT
=2.8V, I
OUT
=200mA
V
OUT
=2.8V, I
OUT
=300mA
Ref. to Output Voltage vs.
Output Current Chart
170
250
0.01
20
70
170
0.1
75
1.0
200
300
0.15
30
100
mA
Dropout Voltage
Line Regulation
Load Regulation
Quiescent Current
Short Current
Shut-down Current
V
DROP
V
LINE
V
Load
I
Q
I
SHORT
I
SHDN
mV
%/V
mV
V
IN
=2.7~5.5V, I
OUT
=1mA
V
OUT
=2.8V , I
OUT
=1~300mA
V
OUT
=2.8V, I
OUT
=0
V
EN
=V
IN,
V
OUT
Short to GND with 1
V
EN
=0V
V
IN
=(V
OUT
+1V)
DC
+0.5V
P-P
A
mA
A
Power Supply Rejection Rate
PSRR
F=217Hz ,Iout=10mA
V
IN
=(V
OUT
+1V)
DC
+0.5V
P-P
F=10KHz, Iout=10mA
dB
65
1.2
0.4
1.0
100
V
V
EN logic high voltage
EN logic low voltage
EN Input Current
Output Noise Voltage
V
ENH
V
ENL
I
EN
e
NO
V
IN
=5.5V, I
OUT
=1mA
V
IN
=5.5V, V
OUT
=0V
V
EN
= 0 to 5.5V
10Hz to 100KHz, C
OUT
=1
F
A
V
RMS
Will Semiconductor Ltd.
3
Dec. 2011 – Rev.3.0
WL2801E
Typical characteristics
(Ta=25
o
C, V
IN
=V
OUT
+1V, C
IN
=C
OUT
=1uF, unless otherwise noted)
90
80
80
70
Quiescent Current (uA)
Quiescent Current(uA)
70
60
50
40
30
20
10
V
OUT
=2.8V
I
O
=0mA
60
50
40
30
20
10
V
OUT
=1.2V
I
O
=0mA
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
Quiescent current vs. Supply voltage
3.00
2.75
2.50
1.4
1.2
Input Voltage(V)
Quiescent current vs. Supply voltage
I
O
=1mA
I
O
=200mA
Output Voltage(V)
1.75
1.50
1.25
1.00
0.75
0.50
I
O
=1mA
I
O
=200mA
Output Voltage(V)
2.25
2.00
1.0
0.8
0.6
0.4
0.2
0.25
0.00
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
0.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage(V)
Output voltage vs. Supply voltage
Input Voltage(V)
Output voltage vs. Supply voltage
3.0
2.5
2.0
1.5
1.0
0.5
0.0
1.4
T
A
= -40 C
o
1.2
Output Voltage (V)
1.0
0.8
0.6
0.4
0.2
0.0
0
100
200
300
400
T
A
= -40 C
o
Output Voltage (V)
VIN = 3.8V
VIN = 4.2V
VIN = 5.5V
0
200
400
600
800
VIN = 2.7V
VIN = 4.2V
VIN = 5.5V
500
600
700
1000 1200 1400
Output Current (mA)
Output voltage vs. Output current
Will Semiconductor Ltd.
4
Output Current (mA)
Output voltage vs. Output current
Dec. 2011 – Rev.3.0
WL2801E
3.0
T
A
= 25 C
2.5
Output Voltage (V)
2.0
1.5
1.0
0.5
0.0
VIN = 3.8V
VIN = 4.2V
VIN = 5.5V
0
200
400
600
800
1000 1200 1400
Output Voltage (V)
o
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
100
200
300
VIN = 2.7V
VIN = 4.2V
VIN = 5.5V
400
500
T
A
= 25 C
o
Output Current (mA)
Output voltage vs. Output current
3.0
T
A
= 85 C
2.5
Output Voltage (V)
2.0
1.5
1.0
0.5
0.0
VIN = 3.8V
VIN = 4.2V
VIN = 5.5V
0
200
400
600
800
1000 1200 1400
Output Voltage (V)
o
Output Current (mA)
Output voltage vs. Output current
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
100
200
300
VIN = 2.7V
VIN = 4.2V
VIN = 5.5V
400
500
T
A
= 85 C
o
Output Current (mA)
Output voltage vs. Output current
100
90
80
70
PSRR(dB)
PSRR(dB)
100
90
80
70
60
50
40
30
20
10
0
10
Output Current (mA)
Output voltage vs. Output current
60
50
40
30
20
10
0
10
100
V
IN
= 3.8V+0.5V
P-P
V
OUT
= 2.8V
I
OUT
= 10mA
1000
Frequency(HZ)
10000
V
IN
= 3.0V+0.5V
P-P
V
OUT
= 1.2V
I
OUT
= 10mA
100
1000
Frequency(HZ)
10000
PSRR
PSRR
Will Semiconductor Ltd.
5
Dec. 2011 – Rev.3.0
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