LM25118, LM25118-Q1

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SNVS726D – JULY 2011 – REVISED AUGUST 2014

Pin Functions (continued)

PIN

DESCRIPTION

NUMBER

NAME

High side gate driver supply used in bootstrap operation. The bootstrap capacitor supplies current to charge the

18

HB

high side MOSFET gate. This capacitor should be placed as close to the controller as possible and connected

between HB and HS.

Buck MOSFET gate drive output. Connect to the gate of the high side buck MOSFET through a short, low

19

HO

inductance path.

Buck MOSFET source pin. Connect to the source terminal of the high side buck MOSFET and the bootstrap

20

HS

capacitor.

EP

Exposed thermal pad. Solder to the ground plane under the IC to aid in heat dissipation.

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