ADP3051 Ver la hoja de datos (PDF) - Analog Devices

Número de pieza

componentes Descripción

Fabricante

ADP3051

500 mA PWM Step-Down DC-DC with Synchronous Rectifier

Analog Devices 

PIN CONFIGURATION AND FUNCTION DESCRIPTIONS

ADP3051

NC 1

8 GND

ADP3051

PGND 2

7 SHDN

SW 3 TOP VIEW 6 COMP

(Not to Scale)

IN 4

5 FB

Figure 2. 8-Lead MSOP Pin Configuration

Table 3. Pin Function Descriptions

Pin No. Mnemonic Description

1

NC

No Connect. Not internally connected.

2

PGND

Power Ground. Connect PGND to GND at a single point. Use separate power ground and quiet ground planes for

the power and sensitive analog circuitry, respectively. See the Circuit Board Layout Considerations section.

3

SW

Switching Output. SW connects to the drain of the internal power switch and synchronous rectifier. Connect the

output inductor between SW and the load.

4

IN

Power Source Input. IN is the source of the high side P-channel MOSFET switch, and supplies the internal power to

the ADP3051. Bypass IN to GND with a 0.1 µF or greater ceramic capacitor, placed as close as possible to IN.

5

FB

Feedback Voltage Sense Input. FB senses the output voltage. To set the output voltage, connect a resistive volt-

age divider from the output voltage to FB. The feedback threshold is 0.8 V. See the Setting the Output Voltage

section.

6

COMP

Feedback Loop Compensation Node. COMP is the output of the internal transconductance error amplifier. Place a

series RC network from COMP to GND to compensate the regulator. See the Compensation Design section.

7

SHDN

Shutdown Input. Drive SHDN low to turn off the ADP3051; drive SHDN to within 0.5 V of VIN to turn on the

ADP3051. See the Shutdown section.

8

GND

Ground.

Rev. 0 | Page 5 of 16

Share Link: