US1061CM データシートの表示（PDF） - Unisem

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US1061CM

DUAL 6A AND 1A LOW DROPOUT POSITIVE FIXED OUTPUT REGULATOR

Unisem 

US1261

PIN DESCRIPTIONS

PIN #

2

5

4

PIN SYMBOL

Vout2

Vout1

Vin

3

Gnd

1

Vctrl

PIN DESCRIPTION

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 4

Vctrl 1

5 Vout1

THERMAL

SHUTDOWN

1.20V +

3 Gnd

Rev. 1.7

3/22/99

1261blk1-1.1

2 Vout2

Figure 1 - Simplified block diagram of the US1261

3-3

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