AIC1117
800mA Low Dropout Positive Regulator
FEATURES
Dropout Voltage 1.2V at 800mA Output Current.
Fast Transient Response.
Line Regulation, typical at 0.015%.
Load Regulation, typical at 0.1%.
Current Limiting and Thermal Protection.
Adjustable Output Voltage or Fixed at 1.8V, 2.5V,
2.85V, 3.3V, and 5V.
Standard 3-Pin Power Packages.
DESCRIPTION
The AIC1117 is a low dropout, three terminals
regulator designed to provide output current
up to 800mA. The device is available in an
adjustable version and fixed output voltage of
1.8V, 2.5V, 2.85V, 3.3V and 5V. Dropout
voltage of maximum of 1.4V is guaranteed at
800mA output current. The quality of low
dropout voltage and fast transient response
make this device ideal for low voltage
microprocessor applications.
The AIC1117 requires output capacitance of a
minimum of 10µF for stability. Built-in output
current limiting and thermal limiting provide
maximal protection to the AIC1117 against
fault conditions.
APPLICATIONS
Active SCSI Terminators.
Post Regulators for Switching Supplies.
Battery Chargers.
PC Add-On Card.
TYPICAL APPLICATION CIRCUIT
V
IN
5V
3
AIC1117
1 ADJ
C1 +
10µF
2
V
REF
V
OUT
3.3V
RF1
125Ω
+
1%
C2
RF2
10µF
205Ω
(Note1)
1%
V
REF
=V
OUT
- V
ADJ
=1.25V (typ.)
V
OUT
=V
REF
x (1+RF2/RF1)+ I
ADJ
x RF2
I
ADJ
=55µA (typ.)
(1) C1 needed if device is far away from filter
capacitors.
(2) C2 required for stability.
Adjustable Voltage Regulator
3
2
V
IN
5V
AIC1117-33
1
V
OUT
3.3V
C1 +
10µF
GND
+
C2
10µF
(Note1)
Fixed Voltage Regulator
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
DS-1117G-01
062007
1
AIC1117
ABSOLUTE MAXIMUM RATINGS
VIN pin to ADJ/ GND pin
Operating Temperature Range
Storage Temperature Range
Maximum Junction Temperature
Lead Temperature (Soldering, 10 sec)
Thermal Resistance (Junction to Case)
TO-220
TO-252
SOT-223
TO-263
Thermal Resistance Junction to Ambient
TO-252
SOT-223
TO-220
(Assume no ambient airflow, no heatsink) TO-263
7V
–40°C to 85°C
–65°C to 150°C
125°C
260°C
3°C /W
12.5°C /W
15°C /W
3°C /W
100°C/W
60°C /W
155°C /W
50°C /W
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT.
3
AIC1117
ELECTRICAL CHARACTERISTICS
(V
IN
=5V, T
A
=25°C, I
O
=10mA, unless otherwise specified) (Note2)
PARAMETER
Reference Voltage
TEST CONDITIONS
AIC1117 (ADJ), T
J
=25°C
0°C≤T
J
≤125°C
AIC1117-18, V
IN
=3.3V
AIC1117-25, V
IN
=5V
MIN.
1.238
1.225
1.78
2.47
2.82
3.26
4.95
TYP.
1.25
1.25
1.8
2.5
2.85
3.30
5.00
0.015
0.035
0.1
0.2
1.2
MAX.
1.262
1.275
1.82
2.53
2.88
3.33
5.05
0.2
0.2
0.3
UNIT
V
Output Voltage
AIC1117-28, V
IN
=5V
AIC1117-33, V
IN
=5V
AIC1117-50, V
IN
=7V
2.65≤V
IN
≤7V,
V
OUT
=1.25V
V
Line Regulation
T
J
=25°C
0°C≤T
J
≤125°C
T
J
=25°C
10mA
≤I
O
≤800mA
0°C≤T
J
≤125°C
%
Load Regulation
%
0.4
1.4
V
A
55
120
µA
µA
%
10
14
mA
mA
%
dB
Dropout Voltage
Current Limit
Adjusted Pin Current (I
ADJ
)
Adjusted Pin Current Change
(∆I
ADJ
)
Temperature Stability
Minimum Load Current
GND Current
RMS Output Noise (% of V
OUT
)
Ripple Rejection Ratio
∆V
OUT
,
∆V
REF
=1%
10mA≤I
O
≤800mA
0.85
2.65≤V
IN
≤7V
10mA≤I
O
≤
800mA
2.65≤V
IN
≤7V
10mA≤I
O
≤800mA
I
O
=0.5A
0.2
0.5
5
5
2.65≤V
IN
≤7V
10Hz
≤
f
≤
10KHz
120Hz input ripple
C
OUT
=25µF
60
10
0.003
72
Note 1:
To avoid output oscillation, aluminum electrolytic output capacitor is recommended and ceramic
capacitor is not suggested.
Note 2:
Specifications are production tested at T
A
=25°C. Specifications over the -40°C to 85°C operating
temperature range are assured by design, characterization and correlation with Statistical Quality
Controls (SQC).
4
AIC1117
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum Differential Voltage (V)
1.8
5
Minimum Load Current (mA)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
200
400
600
800
1000
T
A
=0°C
T
A
=50°C
T
A
=125°C
T
A
=125°C
4
3
T
A
=25°C
2
T
A
=0°C
1
0
Output Current (mA)
1
2
3
4
5
6
7
8
9
Fig. 1 AIC1117 (ADJ) Dropout Voltage
Input/
Output
Differential (V)
Fig. 2 Minimum Load Current (Adjustable Version)
0.09
1.6
Thermal Regulation (%/W)
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01
0.5
I
OUT
=500mA (30mS Puls)
T
A
=125°C
Output Voltage Deviation (%)
1.2
0.8
0.4
0.0
-0.4
-0.8
-1.2
-1.6
I
OUT
=0.5A
1.0
1.5
2.0
2.5
3.0
3.5
Power (Watt)
Fig. 3 AIC1117 (ADJ) Power vs. Thermal Regulation
-20
Temperature (°C)
Fig. 4 AIC1117 (ADJ) Temperature Stability
0
20
40
60
80
100
120
140
-20
Ripple Rejection Ratio (dB)
-30
-40
C
OUT
=3.3µF
C
OUT
=10µF
-50
-60
-70
-80
1
10
2
3
4
5
6
7
C
OUT
=25µF
10
10
Frequency (Hz)
10
10
10
10
Fig. 5 AIC1117 (ADJ) Ripple Rejection Ratio (dB)
5
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