AME, Inc.
AME1117
1A Low Dropout Positive
Voltage Regulator
n
General 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 AME1117 series
provides excellent regulation over line, load and tem-
perature variations.
n
Key Features
l
Low dropout voltage ..............1.2V at 1A
l
Adjustable or fixed voltages 2.5V, 3.3V, 5.0V
l
Typical line regulation ....... 0.2%
l
Typical load regulation ...... 0.15%
l
Adjust pin current less than 90µA
l
Overcurrent protection
l
Thermal protection
l
Available in TO-220, TO-252, SOT-223
n
Applications
l
High Efficiency Linear Regulators
l
5V to 3.3V Voltage Converter
l
Battery Charger
l
Post Regulators for Switching Supplies
n
Functional Block Diagram
In p u t
n
Typical Application
AM E1117
C u rre n t
L im itin g
A m p lifie r
GND
4.75V to 12V
10µF Tan
10µF Tan
Load
T h e rm a l
P ro te ctio n
O u tp u t
E rro r
Am p.
Bandgap
R e fe re n c e
A D J/C O M
Input range depends on V
OUT
Please refer to electrical characteristics.
Figure 1
Figure 2
1
AME, Inc.
AME1117
1A Low Dropout Positive
Voltage Regulator
n
Absolute Maximum Ratings
Parameter
Input Voltage
TO-220
Thermal Resistance
(Junction to Case)
TO-252
SOT-223
TO-220
Thermal Resistance
(Junction to Ambient)
TO-252
SOT-223
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (10 sec)
T
J
T
STG
T
LEAD
θ
JA
θ
JC
Symbol
V
IN
Maximum
7
2.5
5
15
50
90
160
0 to 125
-65 to 150
260
o
o
Unit
V
C/W
C
n
Electrical Characteristics
AME1117AXXX
Parameter
Reference voltage
Line regulation *
Load regulation
Dropout voltage
Current limit
Temp. coefficient
Adjust pin current
Adjust pin
current change
Temperature stability
Minimum load current
RMS output noise
Ripple rejection ratio
Symbol
V
REF
Reg
LINE
Reg
LOAD
V
D
I
S
T
C
I
ADJ
∆
I
ADJ
T
S
I
O
V
N
R
A
Test conditions
V
IN
= 5V, I
O
= 10mA
V
IN
= 4.75~7V, I
O
= 10mA
V
IN
= 5V, I
O
= 10mA~1A
I
O
= 10mA~1A,
∆
Vo =
±
1%
V
IN
= 2.75~7V
V
IN
= 2.75~7V, I
O
= 10mA~1A
V
IN
T
J
= 25
o
C
= 2.75~7V, I
O
= 10mA~1A
Over Temp.
Min.
Typ.
Max.
Unit
V
T
J
= 25
o
C 1.238 1.250 1.262
Over Temp. 1.225 1.250 1.275
T
J
= 25
o
C
T
J
= 25
o
C
Over Temp.
T
J
= 25
o
C
Over Temp.
Over Temp.
-
-
-
-
-
1.0
-
-
-
-
-
-
-
60
0.2
0.5
5
0.003
72
10
-
-
-
0.05
0.2
1.2
1.3
-
0.005
55
0.2
0.3
0.4
1.4
-
-
-
-
90
5
%
mA
%V
O
dB
µ
A
V
A
%/”C
%
V
IN
= 2.75~7V, I
O
= 10mA~1A, Over Temp.
V
IN
= 5V, I
O
= 100mA, Over Temp.
V
IN
= 5V
T
J
= 25
o
C
V
IN
= 5V, I
O
= 1A, Over Temp.
4
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
