US1060CM 데이터 시트보기 (PDF) - Unisem

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US1060CM

DUAL 6A AND 1A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR

Unisem 

US1260

PIN DESCRIPTIONS

PIN #

3

2

5

7

6

PIN SYMBOL

Vfb2

Vfb1

Vout2

Vout1

Vin

4

Gnd

1

Vctrl

PIN DESCRIPTION

A resistor divider from this pin to the Vout #2 pin and ground sets the output

voltage. See application ckt for the divider setting for 1.5V output.

A resistor divider from this pin to Vout #1 pin and ground sets the output

voltage.See application ckt for the divider setting for 2.5V output.

The output #2 (high current) of the regulator. A minimum of 100uF capacitor

must be connected from this pin to ground to insure stability.

The output #1 (low current) of the regulator. A minimum of 100uF capacitor

must be connected from this pin to ground to insure stability.

The power input pin of the regulator. Typically a large storage capacitor is

connected from this pin to ground to insure that the input voltage does not sag

below the minimum drop out voltage during the load transient response. This

pin must always be higher than both Vout pins by the amount of the dropout

voltage(see datasheet) in order for the device to regulate properly.

This pin is connected to GND. It is also the TAB of the package.

The control input pin of the regulator. This pin via a 10Ω resistor is connected

to the 5V supply to provide the base current for the pass transistor of both

regulators. This allows the regulator to have very low dropout voltage

which allows one to generate a well regulated 2.5V supply from the 3.3V input.

A high frequency, 1 uF capacitor is connected between this pin and Vin pin to

insure stability.

BLOCK DIAGRAM

Vin 6

Vctrl 1

7 Vout1

2 Vfb1

THERMAL

SHUTDOWN

1.20V +

4 Gnd

1260blk1-1.1

3 Vfb2

5 Vout2

Figure 1 - Simplified block diagram of the US1260

Rev. 1.9

3/22/99

3-3

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