AIC1117A
1A Low Dropout Positive Adjustable Regulator
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC www.analog.com.tw
DS-1117A-00 May 21, 01 TEL: 886-3-5772500 FAX: 886-3-5772510 1
n FEATURES
l Dropout Voltage 1.3V at 1A Output Current.
l Fast Transient Response.
l Line Regulation typically at 0.015%.
l Load Regulation typically at 0.1%.
l Internal Thermal and Current Limiting.
l Adjustable Output Voltage or Fixed 2.85V, 3.3V,
5V.
l Standard 3-Pin Power Packages.
n APPLICATIONS
l Post Regulator for Switching Supply.
l Active SCSI Termination.
l Battery Chargers.
l Constant-Current Regulators.
l Motherboard Clock Supplies.
n DESCRIPTION
The AIC1117A is a low dropout three terminal
regulator with 1A output current capability. The
output voltage is adjustable with the use of a
resistor divider or fixed 2.85V, 3.3V, 5V. Dropout
is guaranteed at a maximum of 1.5V at
maximum output current. Its low dropout voltage
and fast transient response make it ideal for low
voltage microprocessor applications. Internal
current and thermal limiting provides protection
against any overload condition that would create
excessive junction temperatures.
n TYPICAL APPLICATION CIRCUIT
C2
10µF
VOUT
3.3V
VIN
5V
+
+ VREF
RF2
205Ω
1%
ADJ
AIC1117A
C1
10µF
23
1 RF1125Ω
1%
VREF=VOUT - VADJ=1.25V (typ.)
VOUT=VREF x (1+RF2/RF1)+ IADJ x RF2
IADJ=55µA (typ.)
(1) C1 needed if device is far away from filter
capacitors.
(2) C2 required for stability.
Adjustable Voltage Regulator
C2
10µF
VOUT
3.3V
VIN
5V
+
+
GND
C1
10µF
AIC1117A-33
Fixed Voltage Regulator