eorex
EP1201
250mA Ultra Low Dropout Linear Regulator
Features
Description
• Maximum Output Current: 250mA
• Highly Accurate: Output Voltage±2%
• Low Power Consumption: 2uA Typ.
• Small input/output differential:
0.4V at 160mA (VOUT=3.3V)
0.12V at 100mA (VOUT=5.0V)
• SOT-23 Package
The EP1201 series is a group of positive voltage
output, three-pin regulators, that provides a high
current even when the input/output voltage
differential is small. Low power consumption
and high accuracy is achieved through CMOS
and programmable fuse technologies.
The EP1201 consists of a high-precision voltage
reference, an error correction circuit, and a
current limited output driver. Transient responses
to load variations have improved in comparison to
the existing series. SOT-23(150mW) package is
available.
Applications
• Battery Powered Equipment
• Palmtops
• Portable Cameras and Video Recorders
• Reference Voltage Sources
Typical Application
Jul. 2006
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EP1201
Pin Assignment
Ordering Information
Pin Description
Pin
Name
Function
1
GND
Ground
2
VOUT
Output Voltage
3
VIN
Input Voltage
Absolute Maximum Rating
Symbol
Item
Rating
Units
VIN
Input Voltage
12
V
IOUT
Output Current
500
mA
VOUT
Output Voltage
GND-0.3~ VIN+0.3
V
150
mW
PD
Continuous Total Power Dissipation
TOPR
Operating Ambient Temperature Range
-30 ~ +80
°C
TSTG
Storage Temperature Range
-40 ~ +125
°C
250
°C/W
θJA
Thermal Resistance (Junction-to-Ambient)
Jul. 2006
SOT-23
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EP1201
Electrical Characteristics
Symbol
VOUT(E)
(Note 1)
IOUT(max)
VD
Parameter
Output Voltage
Maximum Output
Current
Dropout
Voltage
(Note 2)
VD1
VD2
VD1
VD2
REGLINE
REGLOAD
Line Regulation
(∆VOUT/∆VIN∆VOUT)
Load Regulation
(∆VOUT)
IS
Supply Current
VIN
Input Voltage
Output Voltage
Temperature
Characteristics
(∆VOUT/∆TOPR∆VOUT)
Conditions
Min.
Typ.
Max.
EP1201-18
VIN=2.8V, IOUT=40mA
1.764
1.800
1.836
EP1201-33
VIN=4.3V, IOUT=40mA
3.234
3.300
3.366
EP1201-18
VIN=2.8V,
VOUT(E)≥1.62V
80
EP1201-33
VIN=4.3V,
VOUT(E)≥2.97V
150
200
370
IOUT=80mA
450
710
IOUT=80mA
200
360
IOUT=160mA
450
700
EP1201-18
IOUT=40mA,
2.8V≤VIN≤10V
0.2
0.3
EP1201-33
IOUT=40mA,
4.3V≤VIN≤10V
0.2
0.3
EP1201-18
VIN=2.8V,
1mA≤ IOUT ≤40mA
10
30
EP1201-33
VIN=4.3V,
1mA≤ IOUT ≤80mA
20
50
EP1201-18
VIN=2.8V
3.0
5.0
EP1201-33
VIN=4.3V
2.0
5.0
EP1201-33
V
mA
IOUT=40mA
EP1201-18
Units
mV
%/V
mV
EP1201-18
1.8
10
EP1201-33
1.8
10
EP1201-18
IOUT=40mA,
-40°C≤TOPR≤85°C
±100
EP1201-33
IOUT=40mA,
-40°C≤TOPR≤85°C
±100
μA
V
ppm/°C
Note 1:VOUT(E) = Effective output voltage (i.e. the output voltage when “VOUT+1.0V” is provided while
maintaining a certain IOUT value.
(Note 3)
(Note 4)
Note 2:VD = { VIN1
- VOUT1
}
Note 3:The input voltage at the time VOUT1 is output input voltage has been gradually reduced.
Note 4: A voltage equal to 98% of the output voltage when a stabilized (VOUT+ 1.0V) is input.
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Supply Current (μA)
Supply Current (μA)
Input/Output Voltage Differential (V)
Output Voltage (V)
Output Voltage (V)
Output Voltage (V)
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EP1201
Typical Performance Characteristics
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EP1201
Typical Performance Characteristics (Continued)
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EP1201
Typical Performance Characteristics (Continued)
Functional Block Diagram
Functional Description
A minimum of 10µF capacitor must be connected from VOUT to ground to insure stability. Typically a large
storage capacitor is connected from VIN to ground to ensure that the input voltage does not sag below
the minimum dropout voltage during the load transient response. This pin must always be 0.7V higher
than VOUT in order for the device to regulate properly.
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EP1201
Marking Information
Appendix
Identification Code
Part Number
VOUT
BB
EP1201
1.5V
BC
EP1201
1.8V
BD
EP1201
2.5V
BE
EP1201
2.8V
BF
EP1201
3.3V
Date Code Convention
Year 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014
Y
W
Mark
Year
5
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1
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4
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Mark
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Week
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Mark
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U
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EP1201
Package Description
SOT-23
DIM
A
A1
A2
b
c
D
E
H
e
e1
L
L1
θ
θ1
θ2
MIN.
1.05
0.05
1.00
0.25
0.08
2.70
1.50
2.60
1.80
0.85
0.50
0.30
0°
3°
6°
MILLIMETERS
NOM.
−
−
1.10
−
−
2.90
1.60
2.80
1.90
0.95
0.60
−
5°
5°
8°
MAX.
1.35
0.15
1.20
0.50
0.20
3.00
1.70
3.00
2.00
1.05
0.70
0.60
10°
7°
10°
Jul. 2006
MIN.
0.041
0.002
0.039
0.010
0.003
0.106
0.059
0.102
0.071
0.033
0.020
0.012
0°
3°
6°
INCHES
NOM.
−
−
0.043
−
−
0.114
0.063
0.110
0.075
0.037
0.024
−
5°
5°
8°
MAX.
0.053
0.006
0.047
0.020
0.008
0.118
0.067
0.118
0.079
0.041
0.028
0.024
10°
7°
10°
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