APU1205 Ver la hoja de datos (PDF) - Advanced Power Electronics Corp

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componentes Descripción

Fabricante

APU1205

300mA ULTRA LOW DROPOUT POSITIVE ADJUSTABLE AND FIXED REGULATORS

Advanced Power Electronics Corp 

APU1205

APU1205-18 / APU1205-25 / APU1205-28

APU1205-30 / APU1205-33 / APU1205-36

Note 1: Low duty cycle pulse testing with Kelvin con-

nections is required in order to maintain accurate data.

Note 2: Dropout voltage is defined as the minimum dif-

ferential voltage between VIN and VOUT required to main-

tain regulation at VOUT. It is measured when the output

voltage drops 1% below its nominal value.

Note 3: Ground current is the regulator quiescent cur-

rent plus the pass transistor current. The total current

from the supply is the sum of the load current plus the

ground pin current.

Note 4: The specification applies for the junction tem-

perature of 0 to +1258C.

PIN DESCRIPTIONS

PIN #

1

PIN SYMBOL

VIN

PIN DESCRIPTION

The 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 VOUT by at least the amount of the dropout voltage and some margin in order for

the device to regulate properly.

2

Gnd

Ground pin. This pin must be connected to the lowest potential in the system and all

other pins must be at higher potential with respect to this pin.

3

En

Enable pin. A low signal or left open on this pin shuts down the output. This pin must

be tied HI or to VIN for normal operation.

4

Adj

A resistor divider from this pin to the VOUT pin and ground sets the output voltage. To

(Adjustable Only) minimize the error due to the error amplifier, select the values of the resistor dividers

to be less than 10KV.

4

CBYP

A 470 to 1000pF bypass capacitor connected to this pin reduces the output noise.

(Fixed Only)

5

VOUT

The output of the regulator. A minimum of 2.2mF with max ESR of 1V capacitor must

be connected from this pin to ground to insure stability.

5-PIN

SOT-23

APU1205

APU1205-18

APU1205-25

APU1205-28

APU1205-30

APU1205-33

APU1205-36

Output

Voltage

1.25V

1.8V

2.5V

2.8V

3.0V

3.3V

3.6V

Table 1- Nominal output voltage vs. part number.

The output voltage of the adjustable device can be set

using:

( ) Vo = 1.253

1+

R1

R2

Where:

R1 = Resistor connected from output to the Adj pin

R2 = Resistor connected from Adj pin to Gnd

3/4

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