Analog Microelectronics, Inc.
1
AME1117 1A Low Dropout Positive
V oltage Regulator
nn
nn
n Typical Application
nn
nn
nGeneral Descriptions
The AME1117 is a 1A low-dropout positive voltage regu-
lator. It is available in fixed and adjustable output
voltage versions. Overcurrent and thermal protection
are integrated onto the chip. Output current will limit
as while it reaches the pre-set current or temperature
limit. The dropout voltage is specified at 1.4V Maxi-
mum at full rated output current. The AME1 1 17 series
provides excellent regulation over line, load and tem-
perature variations.
nn
nn
nApplications
lHigh Efficiency Linear Regulators
l5V to 3.3V V oltage Converter
lBattery Charger
lPost Regulators for Switching Supplies
nn
nn
nFunctional Block Diagram
Figure 1
nn
nn
nKey Features
lLow dropout voltage ..............1.2V at 1A
lAdjustable or fixed voltages 2.5V , 3.3V, 5.0V
lTypical line regulation ....... 0.2%
lTypical load regulation ...... 0.15%
lAdjust pin current less than 90µA
lOvercurrent protection
lThermal protection
lAvailable in TO-220, TO-252, SOT-223
Input range depends on VOUT
Please refer to electrical characteristics.
Figure 2
Thermal
Protection
Bandgap
Reference
Current
Limiting
Amplifier
Input
Output
ADJ/COM
Error
Amp.
10
µ
F Tan4.75V to 12V
Load
10
µ
F Tan
AME1117
GND
Analog Microelectronics, Inc.
2
AME1117 1A Low Dropout Positive
V oltage Regulator
nn
nn
n Pin Configuration
V
IN
ADJ/GND
V
OUT
AME1117
TO-220 Front View SOT-223 Front View
123
AME 1117
ADJ/GND V
OUT
V
IN
123
AME 1117
ADJ/GND V
OUT
V
IN
TO-252 ( DPAK-2)
Front View
TO-252 ( DPAK-2)
Front View
AME1117
123
ADJ/GND
VOUT
VIN
Analog Microelectronics, Inc.
3
AME1117 1A Low Dropout Positive
V oltage Regulator
nn
nn
n Ordering Information
Part Number Marking Output Voltage Package
AME1117ACGT ABEyww ADJ
AME1117BCGT AKEyww 2.5
AME1117CCGT ABFyww 3.3
AME1117DCGT AKFyww 5.0
AME1117ACCT AME1117
ACCT
yyww ADJ
AME1117BCCT AME1117
BCCT
yyww 2.5
AME1117CCCT AME1117
CCCT
yyww 3.3
AME1117DCCT AME1117
DCCT
yyww 5.0
AME1117ACBT AME1117
ACBT
yyww ADJ
AME1117BCBT AME1117
BCBT
yyww 2.5
AME1117CCBT AME1117
CCBT
yyww 3.3
AME1117DCBT AME1117
DCBT
yyww 5.0
SOT-223
TO-220
TO-252
(DPAK-2)
Analog Microelectronics, Inc.
4
AME1117 1A Low Dropout Positive
V oltage Regulator
nn
nn
n Absolute Maximum Ratings
nn
nn
n Electrical Characteristics
AME1117AXXX
Parameter Symbol Min. Typ. Max. Unit
TJ = 25oC1.238 1.250 1.262
Over Tem p. 1. 225 1. 250 1. 275
TJ = 25oC- 0.05 0.3
Over Tem p. - 0. 2 0. 4
TJ = 25oC-1.21.4
O ver Te m p. - 1.3 -
Current lim it IS VIN = 2.75~7V Over Temp. 1.0 - - A
Temp. coefficient TC VIN = 2.75~7V, IO = 10mA ~1A - 0.005 - %/”C
TJ = 25oC-55 -
O ver Te m p. - 90
Adjust pin
current change
Tem perat ure st abi li t y TS VIN = 5V, IO = 100mA , Over Temp. -0.5 %
Minimum load c urrent IO VIN = 5V -510mA
RM S output nois e VN TJ = 25oC-0.003 - %VO
Ripple rejec tion ratio RA VIN = 5V, IO = 1A, O ver Tem p. 60 72 - dB
--0.2
Dropou t voltage V D IO = 10mA ~1A, ∆Vo = ±1%
-
Reference vol t ag e V REF V
Adjust pin current IADJ
Line regulation *
Load regulat ion %
VIN = 5V, IO = 10m A ~1A
Te st conditions
VIN = 2.75~7V, IO = 10m A~ 1A
VIN = 5V, IO = 10m A
∆IADJ VIN = 2.75~7V, IO = 10m A~1A , Over Tem p .
RegLOAD
RegLINE VIN = 4.75~7V, IO = 10m A TJ = 25oC
µA
50.2
V
Symbol Maximum Unit
VIN 7V
TO-220 2.5
TO-252 5
SOT-223 15
TO-220 50
TO-252 90
SOT-223 160
Operat ing Junc tion Tem perat ure Range TJ0 to 125
TSTG -65 t o 150
TLEAD 260
oC/W
Therm al Resist ance
(Junc t ion t o A m bi ent) θJA
oC
Storage Temperat ure Range
Lead Temperat ure (10 sec)
Parameter
Input Volt age
Therm al Resist ance
(Junc t ion t o Cas e) θJC
Analog Microelectronics, Inc.
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AME1117 1A Low Dropout Positive
V oltage Regulator
*Line regulation test circuit
AME1117BXXX
Parameter Symbol Min. Typ. Max. Unit
TJ = 25oC2.475 2.500 2.525
Over Tem p. 2. 450 2. 500 2. 550
TJ = 25oC- 0.05 0.3
Over Tem p. - 0.2 0.4
TJ = 25oC-1.21.4
Over Tem p. - 1.3 -
Current lim it IS VIN = 4.75~ 7V , O ver Tem p. 1. 0 - - A
Qui esc ent Current IQ VIN = 5V , IO = 0A~1A, Over Temp. - 6 13 mA
Temp. Coefficient TC VIN = 4. 75~ 7V, IO = 0A~ 1A - 0. 005 - %/ ”C
Tem perature s t abili ty TS VIN = 5V, IO = 100mA, Over Tem p. - 0.5 - %
RM S ou t pu t noi se V N TJ = 25oC - 0.003 - %VO
Ripple rejec t ion rati o RA VIN = 5V , IO = 1A, Over Tem p. 60 72 - dB
- - 0.2
Dropout vol t age V D IO = 0A~1A, ∆Vo = ±1%
RegLOAD VIN = 5V, IO = 0A~1A
VIN = 4. 75~ 7V, IO = 0A TJ = 25oC
V
Te st conditions
Output voltage VO VIN = 5V , IO = 0A V
Line regulat ion RegLINE %
Load regulat ion
AME1117CXXX
Parameter Symbol Min. Typ. Max. Unit
TJ = 25oC3.270 3.300 3.330
Over Tem p. 3. 234 3. 300 3. 366
TJ = 25oC- 0.05 0.3
Over Tem p. - 0.2 0.4
TJ = 25oC-1.21.4
Over Tem p. - 1.3 -
Current lim it IS VIN = 4.75~ 7V , O ver Tem p. 1. 0 - - A
Qui esc ent Current IQ VIN = 5V , IO = 0A~1A, Over Temp. - 6 13 mA
Temp. c oefficient TC VIN = 4. 75~ 7V, IO = 0A~ 1A - 0. 005 - %/ ”C
Tem perature s t abili ty TS VIN = 5V, IO = 100mA, Over Tem p. - 0.5 - %
RM S ou t pu t noi se V N TJ = 25oC - 0.003 - %VO
Ripple rejec t ion rati o RA VIN = 5V , IO = 1A, Over Tem p. 60 72 - dB
V IO = 0A ~1A, ∆Vo = ±1%
Te st conditions
Output voltage VO
Dropout vol t age V D
%
V VIN = 5V , IO = 0A
Load regulat ion
Line regulat ion
VIN = 5V , IO = 0A~1A
RegLINE
RegLOAD
VIN = 4. 75~ 7V, IO = 0A TJ = 25oC- - 0.2
Analog Microelectronics, Inc.
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AME1117 1A Low Dropout Positive
V oltage Regulator
Figure 3
OUT
ADJ
IN
V
IN
V
OUT
10
µ
Tan 164
100
10
µ
Tan
AME1117DXXX
Parament Symbol Min. Typ. Max. Unit
TJ = 25oC4.950 5.000 5.050
Over Tem p. 4. 900 5.000 5. 100
TJ = 25oC--0.3
Over Tem p. - - 0.4
TJ = 25oC- 0.05 0.3
Over Tem p. - 0. 2 0. 4
TJ = 25oC-1.21.4
Over Tem p. - 1. 3 -
Current lim it IS VIN = 7~10V , Over Temp. 1. 0 - - A
Quiescent Current IQ VIN = 7V, IO = 0A~1A, Over Temp. - 6 13 mA
Temp. coefficient TC VIN = 7~ 10V, IO = 0A~ 1A - 0. 005 - %/ ”C
Tem perature s t abil i t y TS VIN = 7V, IO = 100m A, O ver Tem p. - 0. 5 - %
RMS out put noise VN TJ = 25oC - 0.003 - %VO
Ripple reject ion rat io RA VIN = 7V, IO = 1A , Over Tem p. 60 72 - dB
V Dropout volt age VD IO = 0A~1A, ∆Vo = ±1%
Test conditions
VIN = 7V, IO = 0A
VIN = 7~9V, IO = 0A Li ne regulat i on RegLINE %
VIN = 7V, IO = 0A~1A
Output voltage VVO
Load regulat i on RegLOAD
Analog Microelectronics, Inc.
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AME1117 1A Low Dropout Positive
V oltage Regulator
nn
nn
n Performance Characteristics
3. Temperature Stablilty
2. Short Circuit Current 4. Dropout Voltage
1. Load Regulation
0.0
0.5
1.0
1.5
2.0
2.5
3.0
12345678910
Input/ Output Di ff er ential V oltage( V)
Output Short Circuit Current (A
)
0.90
0.95
1.00
1.05
1.10
1.15
1.20
1.25
0 0.2 0.4 0.6 0.8 1
Load Cur r ent ( A)
Drop-out Voltage (V
)
-0.25
-0.20
-0.15
-0.10
-0.05
0.00
-50-30-101030507090
Temperatur e (”C)
Output Voltage deviation (%
1.238
1.240
1.242
1.244
1.246
1.248
1.250
1.252
-50 -25 0 25 50 75 100 125
Temperature (”C)
Reference Voltage (V
)
Analog Microelectronics, Inc.
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AME1117 1A Low Dropout Positive
V oltage Regulator
5. Adjust Pin Current 7. Load Transient Response
6. Minimum Operating Current 8. Line T ransient Response
Time (µS)
0
1
2
3
4
5
6
7
0123456789
Input/Output Di f fer ential V oltage( V)
Minimum Operation Current (m
A
0
5
10
15
20
25
30
35
40
45
-50 -25 0 25 50 75 100 125
Temperature(”C)
Adjust Pin Current (µA)
Analog Microelectronics, Inc.
9
AME1117 1A Low Dropout Positive
V oltage Regulator
nn
nn
n Application Descriptions
Like most regulators, the AME1117 regulates the
output by comparing the output voltage to an inter-
nally generated reference voltage. On the adjust-
able version, the VREF is available externally as
1.25V between VOUT and ADJ. The voltage ratio
formed by R1 and R2 should be set to conduct
10mA (minimum output load). The output voltage
is given by the following equation:
1. Output voltage adjustment
V
OUT
= V
REF
(1+ R2
R1 ) + I
ADJ
x R2
On fixed versions of AME1 117, the voltage divider
is provided internally .
Figure 4
2. Thermal protection
AME1 1 17 has thermal protection which limits
junction temperature to 150OC. However , device
functionality is only guaranteed to a maximum
junction temperature of +125OC.
The power dissipation and junction temperature
for AME1117 in DPAK package are given by
PD = (VIN - VOUT) x IOUT
TJUNCTION = TAMBIENT + ( PD x θJA)
Note: TJUNCTION must not exceed 125OC
3. Current Limit Protection
AME1117 is protected against overload conditions.
Current protection is triggered at typically 1.5A.
AME1117 requires a capacitor from VOUT to GND
to provide compensation feedback to the internal
gain stage. This is to ensure stability at the output
terminal. Typically, a 10µF tantalum or 50µF alu-
minum electrolytic is sufficient.
Note: It is important that the ESR for this
capacitor does not exceed 0.5Ω.
The output capacitor does not have a theoretical
upper limit and increasing its value will increase
stability. COUT = 100µF or more is typical for high
current regulator design.
For the adjustable version, the best load regulation
is accomplished when the top of the resistor di-
vider (R1) is connected directly to the output pin of
the AME1 1 17. When so connected, RP is not mul-
tiplied by the divider ratio.
For fixed output versions, the top of R1 is internally
connected to the output. The ground pin can be
connected to the low side of the load in order to
eliminate ground loop errors.
4. Stability and Load Regulation
Figure 5
C1
V
OUT
= V
REF
(1+ R2
R1 ) + I
ADJ
x R2
OUT
ADJ
IN
V
REF
I
ADJ
50
µ
A
V
IN
V
OUT
R1
R2
OUT
ADJ
IN
V
IN
R1
R2
R
L
R
P
Parasitic
Line Resistance
Connect
R2 to load
(Connect
R1 to case)
Analog Microelectronics, Inc.
10
AME1117 1A Low Dropout Positive
V oltage Regulator
5. Thermal Consideration
The AME1117 series contain thermal limiting cir-
cuitry designed to protect itself from over-tem-
perature conditions. Even for normal load condi-
tions, maximum junction temperature ratings must
not be exceeded. As mentioned in thermal protec-
tion section, we need to consider all sources of
thermal resistance between junction and ambient.
It includes junction-to-case, case-to-heat-sink in-
terface and heat sink thermal resistance itself.
Junction-to-case thermal resistance is specified
from the IC junction to the bottom of the case di-
rectly below the die. Proper mounting is required
to ensure the best possible thermal flow from this
area of the package to the heat sink. The case of
all devices in this product series is electrically con-
nected to the output. Therefore, if the case of the
device must be electrically isolated, a thermally con-
ductive spacer is recommended.
Analog Microelectronics, Inc.
11
AME1117 1A Low Dropout Positive
V oltage Regulator
nn
nn
n Advanced Applications
Adjustable Output V oltage
Paralleling Regulators
* V
O
= Vref (1 + R2/R1) + Iadj X R2
** Optional for improved ripple rejection
AME1117
10
µ
F
V
IN
= 5V
10
µ
F
10
µ
F
*
V
O
= 1.5 ~ 3.45V
R1
2K
**
R2 1K
V
IN
V
OUT
ADJ
* 20m
Ω
is ballast resistance
The inter-connection of #18 wire could act as ballast resistance.
AME1117
10
µ
F
V
IN
10
µ
F
V
O
AME1117
*
20m
Ω
*
20m
Ω
I
O
= 0 to 2A
V
IN
V
OUT
GND
V
IN
V
OUT
GND
Analog Microelectronics, Inc.
12
AME1117 1A Low Dropout Positive
V oltage Regulator
Regulator with Reference
Regulator with Reverse Diode Protection
AME1117
10
µ
F
V
IN
100
µ
F
*
V
O
V
OUT
V
IN
GND
* V
O
= Vref + V
Z
(V
Z
is breakdown voltage of Zener Diode)
** Optional for improved ripple rejection
AME1117
10
µ
F
V
IN
10
µ
F
10
µ
F
*
V
O
Zener Diode or
Voltage Reference
**
1K
V
IN
V
OUT
ADJ
Analog Microelectronics, Inc.
13
AME1117 1A Low Dropout Positive
V oltage Regulator
nn
nn
n Package Dimension
TO-220
SOT-223
MIN MAX MIN MAX
A 4.06 4.83 0.160 0.190
b 0.63 1.02 0.025 0.040
C1 0.35 0.60 0.0138 0.0236
D 14.22 14.99 0.056 0.590
E 9.66 10.54 0.385 0.415
e - 2.79 - 0.110
e1 4.83 5.33 0.190 0.210
e3 1.14 1.40 0.045 0.055
f 1.14 1.40 0.045 0.055
H1 5.94 6.55 0.234 0.258
K 2.29 2.92 0.090 0.115
CP 3.71 3.96 0.146 0.156
Q 2.62 2.87 0.103 0.113
L 12.70 14.27 0.500 0.5618
a 3D7D3D7D
b1 1.14 1.52 0.0449 0.06
R
Notes :
1. Dimension C1 apply for tin plate finish.
2. For solder dip lead finish dim ension C1 should be
0.015"-0.027" (0 .38 - 0.69 )
6.17 REF. 0.243 RE F.
SYMBOLS MILLIMETERS INCHES
MIN MAX MIN MAX
A 1.50 1.80 0.0591 0.0709
A10.02 0.10 0.0008 0.0039
B 0.60 0.838 0.0236 0.033
B12.895 3.15 0.1140 0.1240
C 0.24 0.381 0.0094 0.0150
D 6.299 6.706 0.2480 0.2640
E 3.30 3.708 0.1299 0.1460
e
e1
H 6.70 7.30 0.2638 0.2874
L
L1
L2
a0?10?0?10?
0.91 MIN 0.0360 MIN
2.00 MA X
0.06 BSC 0.0024 BSC
0.0787 MA X
2.30 BSC
4.60 BSC 0.090 BSC
0.181 BSC
MILLIMETERS INCHES
SYMBOLS
α
Analog Microelectronics, Inc.
14
AME1117 1A Low Dropout Positive
V oltage Regulator
TO-252 (DPAK)
nn
nn
n Package Dimension
TO-252 (DPAK)
MIN MAX MIN MAX
A 0.45 0.58 0.0177 0.023
B 1.60 1.95 0.06 0.0768
C 0.51 - 0.02 -
D 0.45 0.60 0.0177 0.0236
E 6.40 6.80 0.252 0.2677
F 5.40 5.80 0.2126 0.2283
G 2.20 2.85 0.0866 0.1122
H - * 2.30 - * 0.0906
I - 0.90 - 0.0354
J - 0.97 - 0.038
K 5.20 5.50 0.20 0.22
L 0.89 2.03 0.035 0.08
* : T y pical v alue
NOTES :
1. CONTROLLING DIME NSION : MILLIM ETERS.
2. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS
MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE
MATERIAL.
SYMBOLS MILLIMETERS INCHES
MIN MAX MIN MAX
A 0.45 0.58 0.0177 0.023
B 1.60 1.95 0.06 0.0768
C 0.51 - 0.02 -
D 0.45 0.60 0.0177 0.0236
E 6.40 6.80 0.252 0.2677
F 5.40 5.80 0.2126 0.2283
G 2.20 2.85 0.0866 0.1122
H - * 2.30 - * 0.0906
I - 0.90 - 0.0354
J - 0.97 - 0.038
K 5.20 5.50 0.20 0.22
L 0.89 2.03 0.035 0.08
* : T y pical valu e
NOTES :
1. CONTROLLING DIME NSION : MILLIM ETERS.
2. MAXIMUM LEAD THICKNESS INCLUDES LEAD FINISH THICKNESS
MINIMUM LEAD THICKNESS IS THE MINIMUM THICKNESS OF BASE
MATERIAL.
SYMBOLS MILLIMETERS INCHES
Life Support Policy:
These products of Analog Microelectronics, Inc. are not authorized for use as critical components in life-
support devices or systems, without the express written approval of the president
of Analog Microelectronics, Inc.
Analog Microelectronics, Inc. reserves the right to make changes in the circuitry and specifications of its
devices and advises its customers to obtain the latest version of relevant information.
Analog Microelectronics, Inc. , December, 2001
Document: 1014-DS1117-C
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