Connection Diagrams

Ordering Information

Ordering Number

Package Type

NSC Package Drawing

Supplied As

LM5109MA

SOIC-8

M08A

Shipped in anti static rails

LM5109MAX

SOIC-8

M08A

2500 shipped as Tape & Reel

LM5109SD

LLP-8

SDC08A

1000 shipped as Tape & Reel

LM5109SDX

LLP-8

SDC08A

4500 shipped as Tape & Reel

Pin Description

Pin #

Name

Description

Application Information

SO-8

LLP-8

11

V

DD

Positive gate drive supply

Locally decouple to V

as close to IC as possible.

2

2

HI

High side control input

The LM5109 HI input is compatible with TTL input thresholds.

Unused HI input should be tied to ground and not left open

3

3

LI

Low side control input

The LM5109 LI input is compatible with TTL input thresholds.

Unused LI input should be tied to ground and not left open.

44

V

SS

Ground reference

All signals are referenced to this ground.

5

5

LO

Low side gate driver output

Connect to the gate of the low side N-MOS device.

6

6

HS

High side source connection

Connect to the negative terminal of the bootstrap capacitor

and to the source of the high side N-MOS device.

7

7

HO

High side gate driver output

Connect to the gate of the low side N-MOS device.

8

8

HB

High side gate driver positive

supply rail

Connect the positive terminal of the bootstrap capacitor to HB

and the negative terminal of the bootstrap capacitor to HS.

The bootstrap capacitor should be placed as close to IC as

possible.

Note: For LLP-8 package it is recommended that the exposed pad on the bottom of the LM5109 be soldered to ground plane on the PCB board and the

ground plane should extend out from underneath the package to improve heat dissipation.

20150502

20150503

FIGURE 2.

www.national.com

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