FC1286 Datasheet, PDF (1/4 Pages) First Components International – 1.5A Ultra Low Dropout Positive Adjustable Regulator

FC1286-XX 1.5A Ultra Low Dropout Positive Adjustable Regulator
1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
Description
The FC1286 is 1.5A regulator with extremely low dropout voltage. This product is specifically designed to
provide well regulated supply for applications requiring 2.8V or lower voltages from 3.3V ATX power supplies
where high efficiency of the switch can be achieved without the cost and complexity associated with switching
regulator. One such application is the new graphic chipsets that requires anywhere from 2.4V to 2.7V supply.
Features
Ô¦0.5V maximum dropout voltage at 1.5A load current
Ô¦Built-in thermal shutdown
Ô¦Output current limiting
Ô¦Adjustable or fixed output voltage 1.5V, 1.8V, 2.5V, 3.3V, 5.0V
Ô¦Fast transient response
Ô¦Good noise rejection
Package Dimensions
Typical Application
REF.
A
b
L4
c
L1
E
Millimeter
Min. Max.
REF.
4.40 4.80 c2
0.66 0.91 L2
0.00 0.30 B D
0.36 0.5
e
2.29 2.79 L
9.80 10.4
Millimeter
Min. Max.
1.25 1.45
1.27 REF.
8.6 9.0
1.70 REF.
14.6 15.8
0˚
8˚
Block Diagram
Pin Descriptions
Name
I/O
Description
Adj (Gnd)
A resistor divider from this pin to the Vout pin and ground sets the output voltage. (Gnd only for fixed mode)
Vsense
Vin
Vctrl
I
The pin is the positive side of the reference that allows remote load sensing to achieve excellent load
regulation. A minimum of 10uF capacitor must be connected from this pin to ground to insure stability.
The input pin of regulator. Typically a large storage capacitor is connected from this pin to ground to insure
I
that the input voltage does not sag below the minimum dropout voltage during the load transient response.
This pin must always be higher than Vout in order for the device to regulate.
This pin is the supply pin for the internal control circuit as well as the base drive for the pass transistor. This
I
pin must always by higher than the Vout pin in order the device to regulate. A minimum of 100uF capacitor
must be connected from this pin to ground to insure stability.
Vout
O
The output of the regulator. A minimum of 100uF capacitor must be connected from this pin to ground to
insure stability.