4

3

2

1

A

B

C

D

ACB

ACB

BGND

FB

PVIN

PVIN

BP

MODE

SW

SW

EN

VCON

PGND

PGND

SGND

VDD

4

3

2

1

A

B

C

D

ACB

ACB

BGND

FB

PVIN

PVIN

BP

MODE

SW

SW

EN

VCON

PGND

PGND

SGND

VDD

Top View

Bottom View

LM3243

www.ti.com

SNVS782C – OCTOBER 2010 – REVISED AUGUST 2015

5

Pin Configuration and Functions

TMD Package

16-Pin DSBGA

Pin Functions

PIN

TYPE

DESCRIPTION

NO.

NAME

A1

PGND

Ground

Power ground to the internal NFET switch.

B1

C1

SGND

Ground

Signal analog and control ground (low current).

D1

VDD

Power

Analog supply input.

A2

Switching node connection to the internal PFET switch and NFET synchronous rectifier. Connect

SW

Analog

B2

specification of the LM3243.

Enable input. Set this digital input HIGH for normal operation. For shutdown, set low. Pin has an

C2

EN

Digital/Input

800-k

Ω internal pulldown resistor.

D2

VCON

Analog

A3

PVIN

Power

Power supply voltage input to the internal PFET switch and ACB.

B3

Bypass mode input. Set the pin HIGH for forced Bypass mode operation. Set the pin LOW for

C3

BP

Digital

automatic analog bypass mode (recommended).

PWM/PFM mode selection input. Setting the pin HIGH allows for PFM or PWM, depending on

D3

MODE

Digital/Input

the load current. Setting the pin LOW forces the part to be in PWM only.

A4

ACB

Output

Analog Current Bypass (ACB). Connect to the output at the output filter capacitor.

B4

C4

BGND

Ground

ACB ground (high current).

D4

FB

Analog

Feedback analog input. Connect to the output at the output filter capacitor.

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Product Folder Links: LM3243