ME1117
1.0A Adjustable Voltage High Speed LDO Regulators ME1117 Series
General Description
Features
ME1117 series are highly accurate, low noise,
LDO Voltage Regulators that are capable of
providing an output current that is in excess of 1.0 A
with a maximum dropout voltage of 1.3 V at 1.0A.
This series contains six fixed output voltages of 1.2
V, 1.5V,1.8 V, 2.5 V, 3.3 V, and 5.0 V that have no
minimum load requirement to maintain regulation.
Also included is an adjustable output version that can
be programmed from 1.25 V to 20 V with two external
resistors.
On
chip
trimming
adjusts
the
reference/output voltage to within ±2.0% accuracy.
Internal protection features consist of output current
Selection
Guide area compensation, and
limiting,
safe operating
thermal shutdown. The ME1117 series can operate
with up to 20 V input.
Typical Application
Output Current in Excess of 1.0A
Dropout Voltage：1.07V@ IOUT =100mA
Operating Voltage Range：
4.8V～20V（ME1117A33）
Highly Accuracy： ±2％
Adjustable Output Voltage Option
Standby Current：3mA（TPY.）
High Ripple Rejection：60dB@1KHz（ME1117A33）
Line Regulation: 0.1％（TYP.）
Temperature Stability≤0.5%
Current Limit（1.3A）
Thermal Shutdown Protection（160℃）
Package
Consumer and Industrial Equipment Point
of Regulation
Switching Power Supply Post Regulation
Hard Drive Controllers
Battery Chargers
3-pin SOT223、、TO-252-2L
Typical Application Circuit
V09
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Page 1 of 14
ME1117
Selection Guide
ME 1117X X X X X G
Environment mark
Package:
B3:SOT223
K3:TO-252-2L
Output Voltage
Function
Product Type
Product Series
Microne
product series
ME1117A15B3G
VOUT =1.5V； Package：SOT223
ME1117A18B3G
VOUT =1.8V； Package：SOT223
ME1117A25B3G
VOUT =2.5V； Package：SOT223
ME1117A33B3G
VOUT =3.3V； Package：SOT223
ME1117A50B3G
VOUT =3.3V； Package：SOT223
ME1117A33K3G
VOUT =3.3V； Package：TO-252-2L
ME1117A50K3G
VOUT =3.3V； Package： TO-252-2L
ME1117FB3G
NOTE:
V09
product description
VFB =1.25V； Package：SOT223
At present ,there are six kinds of voltage value:1.25V（VFB）、 1.5V、1.8V、2.5V、3.3V、
5.0V。If you need other voltage and package, please contact our sales staff。
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Page 2 of 14
ME1117
Pin Configuration
SOT223
TO252-2L
Pin Assignment
ME1117A
Pin Number
Pin Name
Functions
1
VSS
Ground
2
VOUT
Output
3
VIN
Power Input
Pin Number
Pin Name
Functions
1
VADJ
Adjustable Output
2
VOUT
Output
3
VIN
Power Input
ME1117F
Absolute Maximum Ratings
Parameter
Symbol
Ratings
Units
Input Voltage
VIN
20
V
Output Current
IOUT
1.3
A
Output Voltage
VOUT
Vss-0.3～VIN +0.3
V
750
mW
2000
mW
Power Dissipation
SOT223
TO252-2L
PD
Operating Temperature Range
TOPR
－40～＋125
℃
Storage Temperature Range
TSTG
－40～＋150
℃
Junction Temperature Range
TJ
0～＋150
℃
Lead Temperature
Thermal Resistance
Junction-to-Case
Thermal Resistance
Junction-to-Ambient
(No heat sink;
No air flow)
V09
SOT223
260℃，4sec
TO252-2L
260℃，10sec
SOT223
15
°C/W
TO252-2L
10
°C/W
SOT223
136
°C/W
TO252-2L
92
°C/W
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Page 3 of 14
ME1117
Block Diagram
Electrical Characteristics
ME1117F
(VIN= VOUT+1.5V，CIN=CL=10uF，Ta=25OC ,unless otherwise noted)
Parameter
Symbol
Conditions
VIN= VOUT+1.5V，IOUT =10mA
10mA≤IOUT≤1A ，
VOUT+1.5V ≤VIN≤20V
Min.
Typ.
Max.
Units
×0.98
×0.98
1.25
1.25
×1.02
×1.02
V
Reference Voltage
VREF
Maximum Output
Current
IOUTMAX
VIN= VOUT+1.5V
1000
mA
Minimum Output
Current
IOUTMIN
VIN= VOUT+1.5V
2
mA
Line Regulation
∆ VREF-LINE
IOUT =10mA
VOUT+1.5V ≤VIN≤20V
Load Regulation
∆VREF-LOAD
Adjustment Pin Current
IADJ
0.03
0.2
%
VIN= VOUT+1.5V ,0mA≤IOUT≤1A
9
13
mV
VIN= VOUT+1.5V
12
30
uA
Adjust Pin Current
Change
10mA≤ IOUT≤ 1A,
1.5V ≤ VIN-VOUT ≤ 20V
0.2
5
uA
Thermal Shutdown
Junction Temperature
150
V09
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℃
Page 4 of 14
ME1117
ME1117A12
(VIN= VOUT+1.5V，CIN=CL=10uF，Ta=25OC ,unless otherwise noted)
Parameter
Symbol
Output Voltage
VOUT
Maximum Output
Current
IOUTMAX
Load Regulation
∆VOUT-LOAD
Dropout Voltage
(Note 1)
IOUT=10mA,VIN= VOUT+1.5V
10mA≤IOUT≤1A，
VOUT+1.5V ≤VIN≤20V
Min.
Typ.
Max.
Units
×0.98
×0.98
1.2
1.2
×1.02
×1.02
V
VIN= VOUT+1.5V
1000
VIN= VOUT+1.5V , 0mA≤IOUT≤1A
mA
9
15
mV
VDIF1
IOUT =100mA
1.05
1.10
V
VDIF2
IOUT =500mA
1.20
1.30
V
VDIF3
IOUT =1A
1.30
1.40
V
VIN= VOUT+1.5V
3.3
8
mA
1
6
mV
Quiescent Current
ISS
Line Regulation
∆VOUT-LINE
Ripple Rejection Rate
PSRR
Thermal Shutdown
Conditions
TJ
IOUT =10mA，
VOUT+1.5V ≤VIN≤20V
VIN = 12V
+1Vp-pAC
IOUT=10mA,1kHZ
65
IOUT=100mA,1kHZ
60
Junction Temperature
dB
150
℃
ME1117A15
(VIN= VOUT+1.5V，CIN=CL=10uF，Ta=25OC ,unless otherwise noted)
Parameter
Symbol
Output Voltage
VOUT
Maximum Output
Current
IOUTMAX
Load Regulation
∆VOUT-LOAD
Dropout Voltage
(Note 1)
Max.
Units
×0.98
×0.98
1.5
1.5
×1.02
×1.02
V
1000
VIN= VOUT+1.5V , 0mA≤IOUT≤1A
mA
12
16
mV
1.05
1.10
V
VDIF2
IOUT =500mA
1.20
1.30
V
VDIF3
IOUT =1A
1.30
1.40
V
VIN= VOUT+1.5V
3.3
8
mA
1
6
mV
Line Regulation
∆VOUT-LINE
V09
VIN= VOUT+1.5V
Typ.
IOUT =100mA
ISS
Thermal Shutdown
IOUT=10mA,VIN= VOUT+1.5V
10mA≤IOUT≤1A，
VOUT+1.5V ≤VIN≤20V
Min.
VDIF1
Quiescent Current
Ripple Rejection Rate
Conditions
PSRR
TJ
IOUT =10mA，
VOUT+1.5V ≤VIN≤20V
VIN = 12V
+1Vp-pAC
IOUT=10mA,1k
HZ
65
IOUT=100mA,1
kHZ
60
Junction Temperature
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dB
150
℃
Page 5 of 14
ME1117
ME1117A18
(VIN= VOUT+1.5V，CIN=CL=10uF，Ta=25OC ,unless otherwise noted)
Parameter
Symbol
Output Voltage
VOUT
Maximum Output
Current
IOUTMAX
Load Regulation
∆VOUT-LOAD
Dropout Voltage
(Note 1)
Conditions
IOUT=10mA,VIN= VOUT+1.5V
10mA≤IOUT≤1A，
VOUT+1.5V ≤VIN≤20V
Min.
Typ.
Max.
Units
×0.98
×0.98
1.8
1.8
×1.02
×1.02
V
VIN= VOUT+1.5V
1000
VIN= VOUT+1.5V , 0mA≤IOUT≤1A
mA
13
18
mV
VDIF1
IOUT =100mA
1.05
1.10
V
VDIF2
IOUT =500mA
1.20
1.30
V
VDIF3
IOUT =1A
1.30
1.40
V
VIN= VOUT+1.5V
3.5
8
mA
1
6
mV
Quiescent Current
ISS
Line Regulation
∆VOUT-LINE
Ripple Rejection Rate
PSRR
Thermal Shutdown
IOUT =10mA，
VOUT+1.5V ≤VIN≤20V
VIN = 12V
+1Vp-pAC
IOUT=10mA,1kHZ
65
IOUT=100mA,1kHZ
60
Junction Temperature
dB
150
℃
ME1117A25
(VIN= VOUT+1.5V，CIN=CL=10uF，Ta=25OC, unless otherwise noted)
Parameter
Symbol
Output Voltage
VOUT
Maximum Output
Current
IOUTMAX
Load Regulation
∆VOUT-LOAD
Dropout Voltage
(Note 1)
VIN= VOUT+1.5V
VIN=VOUT+1.5V
0mA≤IOUT≤1000mA
Typ.
Max.
Units
×0.98
×0.98
2.5
2.5
×1.02
×1.02
V
1000
,
mA
17
25
mV
IOUT =100mA
1.05
1.10
V
VDIF2
IOUT =800mA
1.20
1.30
V
VDIF3
IOUT =1A
1.30
1.40
V
VIN= VOUT+1.5V
3.5
8
mA
2
6
mV
ISS
Line Regulation
∆VOUT-LINE
Ripple Rejection Rate
PSRR
V09
IOUT=10mA,VIN= VOUT+1.5V
10mA≤IOUT≤1A，
VOUT+1.5V ≤VIN≤20V
Min.
VDIF1
Quiescent Current
Thermal Shutdown
Conditions
IOUT =10mA，
VOUT+1.5V ≤VIN≤20V
VIN = 12V
+1Vp-pAC
IOUT=10mA,1kHZ
65
IOUT=100mA,1kHZ
60
Junction Temperature
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dB
150
℃
Page 6 of 14
ME1117
ME1117A33
(VIN= VOUT+1.5V，CIN=CL=10uF，Ta=25OC, unless otherwise noted)
Parameter
Symbol
Output Voltage
VOUT
Maximum Output
Current
IOUTMAX
Load Regulation
∆VOUT-LOAD
Dropout Voltage
(Note 1)
Conditions
IOUT=10mA,VIN= VOUT+1.5V
10mA≤IOUT≤1A，
VOUT+1.5V ≤VIN≤20V
Min.
Typ.
Max.
Units
×0.98
×0.98
3.3
3.3
×1.02
×1.02
V
VIN= VOUT+1.5V
1000
VIN= VOUT+1.5V , 0mA≤IOUT≤1A
mA
24
33
mV
VDIF1
IOUT =100mA
1.07
1.10
V
VDIF2
IOUT =800mA
1.20
1.30
V
VDIF3
IOUT =1A
1.30
1.40
V
VIN= VOUT+1.5V
3.5
8
mA
2
6
mV
Quiescent Current
ISS
Line Regulation
∆VOUT-LINE
Ripple Rejection Rate
PSRR
Thermal Shutdown
IOUT =10mA，
VOUT+1.5V ≤VIN≤20V
VIN = 12V
+1Vp-pAC
IOUT=10mA,1kHZ
65
IOUT=100mA,1kHZ
60
Junction Temperature
dB
150
℃
ME1117A50
(VIN= VOUT+1.5V，CIN=CL=10uF，Ta=25OC, unless otherwise noted)
Parameter
Symbol
Output Voltage
VOUT
Maximum Output
Current
IOUTMAX
Load Regulation
∆VOUT-LOAD
Dropout Voltage
(Note 1)
Quiescent Current
IOUT=10mA,VIN= VOUT+1.5V
10mA≤IOUT≤1A，
VOUT+1.5V ≤VIN≤20V
VIN= VOUT+1.5V
VIN= VOUT+1.5V , 0mA≤IOUT≤1A
Min.
Typ.
Max.
Units
×0.98
×0.98
5.0
5.0
×1.02
×1.02
V
1000
mA
35
50
mV
VDIF1
IOUT =100mA
1.05
1.10
V
VDIF2
IOUT =800mA
1.20
1.30
V
VDIF3
IOUT =1A
1.30
1.40
V
VIN= VOUT+1.5V
3.8
8
mA
2
10
mV
ISS
Line Regulation
∆VOUT-LINE
Ripple Rejection Rate
PSRR
Thermal Shutdown
Conditions
IOUT =10mA
VOUT+1.5V ≤VIN≤20V
VIN = 12V
+1Vp-pAC
IOUT=10mA,1kHZ
65
IOUT=100mA,1kHZ
60
Junction Temperature
dB
150
℃
Note ：1 .VDIF：VIN1 –VOUT (E)’
VIN1 ：The input voltage when VOUT(E)’ appears as input voltage is gradually decreased.
VOUT (E)’=A voltage equal to 99% of the output voltage whenever an amply stabilized Iout and {V OUT
(T)+1.5V} is input.
V09
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Page 7 of 14
ME1117
Type Characteristics
（1） Output Voltage VS. Output Current
（VIN=VOUT+1.5V）
（2） Output Voltage VS. Input Voltage
（Vout=3.3V , IOUT=10mA）
ME1117A33
ME1117A33
Output Voltage VS.Output Current
Output Voltage VS.Input Voltage(Vout=3.3V,Iout=10mA)
3.350
Output Voltage(V)
Output Voltage(V)
3.45
3.35
3.25
3.15
T=25℃
3.05
T=75℃
2.95
2.85
3.300
3.250
T=25℃
T=75℃
3.200
3.150
0
200
400
600
800
1000
4
6
8
10
Output Current (mA)
16
18
20
（4）Load Regulation VS.Temp(Iout from 10mA to 1A)
ME1117A33
ME1117A33
Dropout Voltage VS.Output Current
Load Regulation VS.Temp(Iout from 10mA to 1A)
1.00
1.8
1.5
△ Vout/Vout*100%
Dropout Voltage(V)
14
Input Voltage(V)
（3） Dropout Voltage VS. Output Current
1.2
0.9
0.6
T=25℃
0.3
T=75℃
0
0
200
400
600
800
0.50
0.00
-0.50
-1.00
1000
-40
-25
0
Output Current(mA)
25
50
75
100
125
Temperature(℃)
（5）Output Voltage VS. Temperature
（6）Output Voltage Change VS. Temperature
ME1117A33
ME1117A33
Output Voltage VS.Temperature
Output Voltage (Vout=3.3V)VS. Temperature
4.0
1.50
3.5
1.00
△ Vout/Vout*100%
Output Voltage(V)
12
3.0
2.5
2.0
1.5
1.0
0.50
0.00
-0.50
-1.00
-1.50
-2.00
0.5
-40
-25
0
25
50
75
100
125
150
-25
0
25
50
75
100
125
Temperature(℃)
Temperature(℃)
V09
-40
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Page 8 of 14
150
ME1117
（7）Adj Pin Current VS.Temperature
（8）Ripple Rejection vs. Frequency
ME1117F
ME1117A33
Adj Pin Current VS.Temperature
Ripple Rejection VS. Frequency
Ripple Rejection (dB)
Adj Pin Current(uA)
24
18
12
6
70
60
50
40
30
20
0
-40
-25
0
25
50
75
100
125
150
10
1000
10000
100000
Frequency(Hz)
Temperature(℃)
（9）Line Transient Response
ME1117A33
Ch1：Output Voltage Ch3：Input Voltage
VIN=8V～12V,IOUT=0mA,Ta = 25 °C
V09
100
（10）Load Transient Response
ME1117A33
Ch1：Output Voltage Ch2：Load Current
VIN=4.8V, IOUT=0mA ～240mA,Ta = 25 °C
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Page 9 of 14
ME1117
Applications Information
Introduction
The ME1117 features a significant reduction in dropout
voltage along with enhanced output voltage accuracy
and temperature stability when compared to older
industry standard three−terminal adjustable regulators.
Output Voltage
The typical application circuit for adjustable output
regulator is shown in following Figure. They develop
and maintain the nominal 1.25 V reference voltage
between the output and adjust pins. The reference
voltage is programmed to a constant current source by
resistor R1, and this current flows through R2 to
ground to set the output voltage. The programmed
current level is usually selected to be greater than the
specified 3.0mA minimum that is required for
regulation. Since the adjust pin current, IADJ, is
significantly lower and constant with respect to the
programmed load current, it generates a small output
voltage error that can usually be ignored.
stability and transient response with the additional
benefit of reducing output noise. The output ripple
will increase linearly for fixed and adjustable devices
as the ratio of output voltage to the reference voltage
increases.
Protection Diodes
The ME1117 has two internal low impedance diode
paths that normally do not require protection when
used in the typical regulator applications. The first
path connects between VOUT and VIN , and it can
withstand a peak surge current of about 15 A. Only
when VIN is shorted to ground and COUT is greater
than 100uF, it becomes possible for device damage
to occur. Under these conditions, diode D1 is
required to protect the device. The second path
connects between CADJ and VOUT, and it can
withstand a peak surge current of about 150mA.
Protection diode D2 is required if the output is
shorted to ground and CADJ is greater than 10uF.
External Capacitors
Input bypass capacitor CIN may be required for
regulator stability. This capacitor will reduce the
circuit’s sensitivity when powered from a complex
source. A 10uF ceramic or tantalum capacitor should
be adequate for most applications. Frequency
compensation for the regulator is provided by capacitor
COUT and its use is mandatory to ensure output
stability. A minimum capacitance value of 4.7uF with
an equivalent series resistance (ESR) that is within the
limits of 0.25 ohm to 2.2 ohm is required. Higher values
of output capacitance can be used to enhance loop
V09
Thermal Considerations
This series contains an internal thermal limiting
circuit that is designed to protect the regulator in the
event that the maximum junction temperature is
exceeded. When activated, typically at 175°C, the
regulator output switches off and then back on as the
die cools.
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Page 10 of 14
ME1117
Other Application Circuit
（1） Constant Current Regulator
（2）Slow Turn−On Regulator
（3）Regulator with Shutdown
（4）Digitally Controlled Regulator
Resistor R2 sets the maximum output voltage. Each
transistor reduces the output voltage when turned on.
（5）Battery Backed−Up Power Supply
（6）Adjusting Output of Fixed Voltage Regulators
The 50 ohm resistor that is in series with the
ground pin of the upper regulator level shifts
its output 300 mV higher than the lower
regulator. This keeps the lower regulator off
until the input source is removed.
V09
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Page 11 of 14
ME1117
Packaging Information
● SOT223
V09
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Page 12 of 14
ME1117
● TO252-2L
V09
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Page 13 of 14
ME1117
The information described herein is subject to change without notice.
Nanjing Micro One Electronics Inc is not responsible for any problems caused by circuits or diagrams
described herein whose related industrial properties, patents, or other rights belong to third parties.
The application circuit examples explain typical applications of the products, and do not guarantee the
success of any specific mass-production design.
Use of the information described herein for other purposes and/or reproduction or copying without the
express permission of Nanjing Micro One Electronics Inc is strictly prohibited.
The products described herein cannot be used as part of any device or equipment affecting the human
body, such as exercise equipment, medical equipment, security systems, gas equipment, or any
apparatus installed in airplanes and other vehicles, without prior written permission of Nanjing Micro
One Electronics Inc.
Although Nanjing Micro One Electronics Inc exerts the greatest possible effort to ensure high quality
and reliability, the failure or malfunction of semiconductor products may occur. The user of these
products should therefore give thorough consideration to safety design, including redundancy,
fire-prevention measures, and malfunction prevention, to prevent any accidents, fires, or community
damage that may ensue.
V09
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Page 14 of 14
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