AH1117
1A Bipolar Linear Regulator
DESCRIPTION
FEATURES
AH1117 is a series of low dropout three-terminal
regulators with a typical dropout of 1.3V at 1A load
current.
Besides fixed voltage version ( Vout = 1.2V,
1.5,,1.8V, 2.5V, 3.3V, 5V), AH1117 has an adjustable
version that can provide an output voltage from
1.25 to 12V with two external resistors.
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Maximum output current is 1A
Range of operation input voltage: Max 15V
Line regulation: 0.1%/V (typ.)
Load regulation: 10mV (typ.)
Environment Temperature: -20°C~85°C
APPLICATIONS
AH1117 offers thermal shut down functions to
assure stability of chip and power system. Trimming
technique is used to guarantee output voltage
accuracy within ±2%.
AH1117 is available in SOT-223, TO-252 power
packages.
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DVB
Computer Mother Board, Graphic Card
LCD Monitor and LCD TV
DVD Decode Board
ADSL Modem
Post Regulators for Switching Supplies
ORDERING INFORMATION
PIN CONFIGURATION
AH1117 □
1 □
2 □
3 □
4 □
5
Code
AH1117CLTR□
4 □
4
Product Classification
Marking
1117:
Product Code
B: Fab Code
1117 H
XX:
XXYYZZ
Output Voltage
YY: Lot No.
ZZ: Date Code
AH1117COTR□
4 □
4
Product Classification
1117:
Product Code
B:Fab Code
1117 H XX:
XXYYZZ Output Voltage
YY:Lot No.
1
□
2
□
3
□
4
□
5
□
Description
Temperature&Rohs:
C:-40~85°C ,Pb Free Rohs Std.
Package type:
L:SOT-223
O:TO-252
Packing type:
TR:Tape&Reel (Standard)
Output voltage:
e.g. 12=1.2V 15=1.5V
18=1.8V 25=2.5V
33=3.3V
50=5.0V
AD=Output adjustable
Voltage accuracy:
Blank(default)=±2%
ZZ:Date Code
Vss/Adj Ground Pin/Adjustable
Supply Voltage Input
Vin
Output Voltage
Vout
1
AH1117
ABSOLUTE MAXIMUM RATING
Parameter
Value
15V
150°C
-40°C – 85°C
20°C / W
10°C / W
-40°C - 150°C
260°C, 10S
Max Input Voltage
Max Operating Junction Temperature(Tj)
Ambient Temperature(Ta)
SOT-223
Package Thermal Resistance
TO-252
Storage Temperature(Ts)
Lead Temperature & Time
Note: Exceed these limits to damage to the device. Exposure to absolute maximum rating conditions may affect
device reliability.
RECOMMENDED WORK CONDITIONS
Parameter
Value
Max. 12V
-20°C –125°C
Input Voltage Range
Operating Junction Temperature(Tj)
TYPICAL APPLICATION
AH1117
AH1117
Application circuit of AH1117 fixed version
2
AH1117
ELECTRICAL CHARACTERISTICS
Tj=25°C
Symbol
Vref
Parameter
Reference Voltage
Conditions
AH1117-ADJ
10mA≤Iout≤1A , Vin=3.25V
AH1117-1.2V
0≤Iout≤1A , Vin=3.2V
AH1117-1.8V
0≤Iout≤1A , Vin=3.8V
AH1117-2.5V
Vout
Output Voltage
0≤Iout≤1A , Vin=4.5V
AH1117-3.3V
0≤Iout≤1A , Vin=5.3V
AH1117-5.0V
0≤Iout≤1A , Vin=7.0V
AH1117-12.0V
0≤Iout≤1A , Vin=14V
AH1117-1.2V
Iout=10mA, 2.7V≤Vin≤10V
AH1117-ADJ
Iout=10mA, 2.75V≤Vin≤12V
AH1117-1.8V
Iout=10mA, 3.3V≤Vin≤12V
ΔVout
Line Regulation
AH1117-2.5V
Iout=10mA, 4.0V≤Vin≤12V
AH1117-3.3V
Iout=10mA, 4.8V≤Vin≤12V
AH1117-5.0V
Iout=10mA, 6.5V≤Vin≤12V
AH1117-12.0V
Iout=10mA, 13.5V≤Vin≤20V
AH1117-ADJ
Vin =2.7V, 10mA≤Iout≤1A
AH1117-ADJ
Vin =2.75V, 10mA≤Iout≤1A
AH1117-1.8V
Vin=3.3V, 10mA≤Iout≤1A
ΔVout
Load Regulation
AH1117-2.5V
Vin=4.0V, 10mA≤Iout≤1A
AH1117-3.3V
Vin=4.8V, 10mA≤Iout≤1A
AH1117-5.0V
Vin=6.5V, 10mA≤Iout≤1A
AH1117-12.0V
Vin=13.5V, 10mA≤Iout≤1A
3
Min
Typ
Max
Unit
1.225
1.25
1.275
V
1.176
1.2
1.224
V
1.764
1.8
1.836
V
2.45
2.5
2.55
V
3.234
3.3
3.366
V
4.9
5
5.1
V
11.76
12
12.24
V
0.1
0.2
%/V
0.1
0.2
%/V
0.1
0.2
%/V
0.1
0.2
%/V
0.1
0.2
%/V
0.1
0.2
%/V
0.1
0.2
%/V
10
30
mV
10
30
mV
10
30
mV
10
30
mV
10
30
mV
10
30
mV
10
30
mV
AH1117
ELECTRICAL CHARACTERISTICS continued
Tj=25°C
Symbol
Parameter
Conditions
Typ
Max
Unit
Iout=100mA
1.23
1.3
V
Iout=1A
1.3
1.5
V
Vdrop
Dropout Voltage
Ilimit
Current Limit
Vin-Vout=2V, Tj=25°C
Imin
Minimum Load Current
AH1117-ADJ
Iq
IAdj
Quiescent Current
Adjust Pin Current
Ichange
Iadj change
ΔV/ΔT
Temperature coefficient
θJC
Thermal Resistance
Min
1
A
2
10
mA
AH1117-1.2V, Vin =10V
2
3.5
mA
AH1117-1.8V, Vin =12V
2
3.5
mA
AH1117-2.5V,Vin =12V
2
3.5
mA
AH1117-3.3V, Vin =12V
2
3.5
mA
AH1117-5.0V, Vin =12V
2
3.5
mA
AH1117-12.0V, Vin =20V
2
3.5
mA
55
120
uA
0.2
10
uA
AH1117-ADJ
Vin =5V, 10mA≤Iout≤1A
AH1117-ADJ
Vin =5V, 10mA≤Iout≤1A
±100
SOT-223
20
TO-252
10
ppm
°C/W
Note1: All test are conducted under ambient temperature 25°C and within a short period of time 20ms
Note2: Load current smaller than minimum load current of AH1117-ADJ will lead to unstable or oscillation output.
BLOCK DIAGRAM
4
AH1117
DETAILED DESCRIPTION
AH1117 is a series of low dropout voltage, three terminal regulators. Its application circuit is very simple:
the fixed version only needs two capacitors and the adjustable version only needs two resistors and two capacitors to
work. It is composed of some modules including start-up circuit, bias circuit, bandgap, thermal shutdown, current limit,
power transistors and its driver circuit and so on.
The thermal shut down modules can assure chip and its application system working safety when the junction
temperature is larger than 140°C.
The bandgap module provides stable reference voltage, whose temperature coefficient is compensated by careful design
considerations. The temperature coefficient is under 100 ppm/°C. And the accuracy of output voltage is guaranteed by
trimming technique.
TYPICAL APPLICATION
AH1117 has an adjustable version and six fixed versions (1.2V, 1.5V,1.8V, 2.5V, 3.3V and 5V )
Fixed Output Voltage Version
AH1117
LC1117
Vin
Vin
10uF
Vout
Vout
Gnd
10uF
Application circuit of AH1117 fixed version
1) Recommend using 10uF tan capacitor as bypass capacitor (C1) for all application circuit.
2) Recommend using 10uF tan capacitor to assure circuit stability.
Adjustable Output Voltage Version
AH1117-ADJ provides a 1.25V reference voltage. Any output voltage between 1.25V~12V can be achievable by
choosing two external resistors (schematic is shown below), R1 and R2
AH1117
Application Circuit of AH1117-ADJ
The output voltage of adjustable version follows the equation: Vout=1.25×(1+R2/R1)+IAdj×R2. We can ignore
IAdj because IAdj (about 50uA) is much less than the current of R1 (about 2~10mA).
5
AH1117
1)
To meet the minimum load current (>10mA) requirement, R1 is recommended to be 125ohm or lower. As
AH1117-ADJ can keep itself stable at load current about 2mA, R1 is not allowed to be higher than
625ohm.
2)
Using a bypass capacitor (CADJ) between the ADJ pin and ground can improve ripple rejection. This bypass
capacitor prevents ripple from being amplified as the output voltage is increased. The impedance of CADJ
should be less than R1 to prevent ripple from being amplified. As R1 is normally in the range of
100Ω~500Ω, the value of CADJ should satisfy this equation: 1/(2π×fripple×CADJ)