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WL2801E
Low noise, High PSRR, High speed, CMOS LDO
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.
Features
z Input voltage
: 2.7V~5.5V
z Output range : 1.2V~3.3V
z Output current : 200mA (Up to 300mA Typ.)
z PSRR
: 75dB @ 217Hz
z Dropout voltage : 170mV @ IOUT=200mA
z Quiescent current : 70ȝA Typ.
z Shut-down current : < 0.1ȝA
z Recommend capacitor : 1uF
Applications
z MP3/MP4 Players
z Cellphones, radiophone, digital cameras
z Bluetooth, wireless handsets
z Others portable electronics device
WL2801E
Http://www.willsemi.com
SOT-23-5L
VOUT
NC
54
123
VIN GND EN
Pin Configuration (Top View)
****
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

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Typical Application
VIN
1uF
ON
OFF
15
2
34
VOUT
1uF
Pin Description
WL2801E
PIN Symbol Description
1 VIN Input
2 GND Ground
3 EN Enable (Active high)
4 NC Not connected
5 VOUT Output
Block Diagram
Will Semiconductor Ltd.
2 Dec. 2011 – Rev.3.0

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Absolute Maximum Ratings
Parameter
Power Dissipation
VIN Range
VEN Range
VOUT Range
Lead Temperature Range
Storage Temperature Range
Operating Junction Temperature Range
WL2801E
Value
Internal limited
-0.36.5
-0.3VIN
-0.3VIN
260
-55 ~ 150
150
Unit
mW
V
V
V
oC
oC
oC
Recommend Operating Ratings
Parameter
Operating Supply voltage
Operating Temperature Range
Thermal Resistance, RșJA
Value
2.75.5
-4085
250
Unit
V
oC
oC/W
Electronics Characteristics (Ta=25oC, VIN=VOUT+1V, CIN=COUT=1uF, unless otherwise noted)
Parameter
Symbol
Condition
Min. Typ. Max. Unit
Output Voltage
Current Limit
VOUT
ILIM
VOUT <2V, VIN=2.7V, IOUT=1mA
VOUṮ2V, IOUT=1mA
VEN=VIN
0.97
VOUT
VOUT
1.03
VOUT
0.98
VOUT
VOUT
1.02
VOUT
Ref. to Output Voltage vs.
Output Current Chart
V
mA
Dropout Voltage
Line Regulation
Load Regulation
Quiescent Current
Short Current
Shut-down Current
Power Supply Rejection Rate
VDROP
ƸVLINE
ƸVLoad
IQ
ISHORT
ISHDN
PSRR
VOUT=2.8V, IOUT=200mA
VOUT=2.8V, IOUT=300mA
VIN=2.7~5.5V, IOUT=1mA
VOUT=2.8V , IOUT=1~300mA
VOUT=2.8V, IOUT=0
VEN=VIN,
VOUT Short to GND with 1ȍ
VEN=0V
VIN=(VOUT+1V)DC+0.5VP-P
F=217Hz ,Iout=10mA
VIN=(VOUT+1V)DC+0.5VP-P
F=10KHz, Iout=10mA
170 200
mV
250 300
0.01 0.15 %/V
20 30 mV
70 100 ȝA
170 mA
0.1 1.0 ȝA
75
dB
65
EN logic high voltage
EN logic low voltage
EN Input Current
Output Noise Voltage
VENH
VENL
IEN
eNO
VIN=5.5V, IOUT=1mA
1.2
V
VIN=5.5V, VOUT=0V
0.4 V
VEN= 0 to 5.5V
1.0 ȝA
10Hz to 100KHz, COUT=1ȝF
100 ȝVRMS
Will Semiconductor Ltd.
3 Dec. 2011 – Rev.3.0

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WL2801E
Typical characteristics (Ta=25oC, VIN=VOUT+1V, CIN=COUT=1uF, unless otherwise noted)
90 80
80 70
70 60
60
50
50
40
40
30
30
20
10
V =2.8V
OUT
I =0mA
O
20
10
V =1.2V
OUT
I =0mA
O
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
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
2.25
2.00
1.75
1.50
I =1mA
O
1.25
1.00
I =200mA
O
0.75
0.50
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
Input Voltage(V)
Output voltage vs. Supply voltage
3.0
T = -40oC
A
2.5
2.0
1.5
1.0
0.5
0.0
0
VIN = 3.8V
VIN = 4.2V
VIN = 5.5V
200 400 600 800 1000 1200 1400
Output Current (mA)
Output voltage vs. Output current
1.4
1.2 I =1mA
O
1.0 I =200mA
O
0.8
0.6
0.4
0.2
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
1.4
T = -40oC
1.2 A
1.0
0.8
0.6
0.4
0.2
0.0
0
VIN = 2.7V
VIN = 4.2V
VIN = 5.5V
100 200 300 400 500 600
Output Current (mA)
Output voltage vs. Output current
700
Will Semiconductor Ltd.
4 Dec. 2011 – Rev.3.0

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WL2801E
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0
T = 25oC
A
1.4
1.2
T = 25oC
A
1.0
0.8
0.6
VIN = 3.8V
VIN = 4.2V
VIN = 5.5V
200 400 600 800 1000 1200 1400
Output Current (mA)
Output voltage vs. Output current
0.4
0.2
0.0
0
VIN = 2.7V
VIN = 4.2V
VIN = 5.5V
100 200 300 400
Output Current (mA)
Output voltage vs. Output current
500
3.0
T = 85oC
A
2.5
2.0
1.5
1.0
0.5
0.0
0
VIN = 3.8V
VIN = 4.2V
VIN = 5.5V
200 400 600 800 1000 1200 1400
Output Current (mA)
Output voltage vs. Output current
100
90
80
70
60
50
40
30
20
10
0
10
V = 3.8V+0.5V
IN P-P
V = 2.8V
OUT
I = 10mA
OUT
100 1000
Frequency(HZ)
PSRR
10000
1.4
T = 85oC
1.2 A
1.0
0.8
0.6
0.4
0.2
0.0
0
100
90
80
70
60
50
40
30
20
10
0
10
VIN = 2.7V
VIN = 4.2V
VIN = 5.5V
100 200 300 400
Output Current (mA)
Output voltage vs. Output current
500
V = 3.0V+0.5V
IN P-P
V = 1.2V
OUT
I = 10mA
OUT
100 1000
Frequency(HZ)
PSRR
10000
Will Semiconductor Ltd.
5 Dec. 2011 – Rev.3.0