GND

C2

C1

EN

MODE

B1

B2

SW

A1

FB

A2

LM3281

VIN

EN

MODE

GND

SW

VIN

FB

A

B

C

1

2

LM3281

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SNVSA38 – NOVEMBER 2014

5 Pin Configuration and Functions

DSBGA (YFQ)

6 Pins

Top

Figure 1. Pin Out

Pin Functions

PIN

TYPE

DESCRIPTION

NO.

NAME

Connect to the output at the output filter capacitor COUT by lowest inductance path with a

A1

FB

Power

trace rated for 2 A.

Connect to input filter capacitor CIN by lowest inductance path, then connect to supply

A2

VIN

Power

voltage with a trace rated for 2 A.

Selects automatic ECO/PWM mode or forced PWM mode. When MODE is HIGH the

B1

MODE

Logic

LM3281 automatically transitions between PWM and ECO operation. When MODE is LOW

the LM3281 operates in PWM mode only. Do not leave MODE pin floating.

B2

SW

Power

Connect to inductor LSW with a trace rated for 2 A.

Set this digital input logic high for normal operation. For shutdown, set to logic low. Do not

C1

EN

Logic

leave EN pin floating.

Connect to input filter capacitor CIN by lowest inductance path, then to system ground by a

C2

GND

Ground

very low inductance path.

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