ADM7155

Data Sheet

Rev. C | Page 6 of 24

PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS

3

BYP

4

GND

1

VREG

2

VOUT

6REF

5 REF_SENSE

8VIN

7EN

ADM7155

TOP VIEW

(Not to Scale)

NOTES

1. THE EXPOSED PAD IS LOCATED ON THE BOTTOM OF

THE PACKAGE. THE EXPOSED PAD ENHANCES

THERMAL PERFORMANCE, AND IT IS ELECTRICALLY

CONNECTED TO GND INSIDE THE PACKAGE. CONNECT

THE EP TO THE GROUND PLANE ON THE BOARD TO

ENSURE PROPER OPERATION.

Figure 3. 8-Lead LFCSP Pin Configuration

ADM7155

TOP VIEW

(Not to Scale)

VIN

8

EN

7

REF

6

REF_SENSE

5

NOTES

1. THE EXPOSED PAD IS LOCATED ON THE BOTTOM OF

THE PACKAGE. THE EXPOSED PAD ENHANCES

THERMAL PERFORMANCE, AND IT IS ELECTRICALLY

CONNECTED TO GND INSIDE THE PACKAGE. CONNECT

THE EP TO THE GROUND PLANE ON THE BOARD TO

ENSURE PROPER OPERATION.

Figure 4. 8-Lead SOIC Pin Configuration

Table 6. Pin Function Descriptions

Pin No.

Mnemonic

Description

1

VREG

Regulated Input Supply Voltage to LDO Amplifier. Bypass VREG to GND with a 10 μF or greater

capacitor.

2

VOUT

Regulated Output Voltage. Bypass VOUT to GND with a 10 μF or greater capacitor.

3

BYP

Low Noise Bypass Capacitor. Connect a 1 μF capacitor from the BYP pin to GND to reduce noise. Do not

connect a load to ground.

4

GND

Ground Connection.

5

REF_SENSE

Reference Sense. Connect Pin 5 to the REF pin. Do not connect Pin 5 to VOUT or GND.

6

REF

Low Noise Reference Voltage Output. Bypass REF to GND with a 1 μF capacitor. Short REF_SENSE to REF

for fixed output voltages. Do not connect a load to ground.

7

EN

Enable. Drive EN high to turn on the regulator; drive EN low to turn off the regulator. For automatic

startup, connect EN to VIN.

8

VIN

Regulator Input Supply Voltage. Bypass VIN to GND with a 10 μF or greater capacitor.

EP

Exposed Pad. The exposed pad is located on the bottom of the package. The exposed pad enhances

thermal performance, and it is electrically connected to GND inside the package. Connect the EP to the

ground plane on the board to ensure proper operation.