Advanced Power

Electronics Corp.

APU8852

PIN DESCRIPTIONS

PIN SYMBOL

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.

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.

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.

Adj (Adjustable only)

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

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

The output of the regulator. A minimum of 2.2uF with max ESR of 1Ω capacitor

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

BLOCK DIAGRAM

3

VOUT

VIN

GND

EN

Figure 3 - APU8852Y5 Adjustable output block diagram.

Figure 4 - APU8852Y5 Fixed Mode output block diagram.

+

-

Thermal

Shutdown

Current

Limit

+

1

4

2

5

3

VIN

CBYP

GND

VOUT

EN

+

-

Thermal

Shutdown

Current

Limit

+

1

4

2

5

3

VIN

ADJ

GND

VOUT

EN