lm5118mhx National Semiconductor Corporation, lm5118mhx Datasheet - Page 3

• Manufacturer Part Number: lm5118mhx
• Description: Wide Voltage Range Buck-boost Controller
• Manufacturer: National Semiconductor Corporation

Pin
16
17
18
19
20
VCCX
Name
VCC
HO
HB
HS
EP
Description
Output of the bias regulator. Locally decouple to PGND using a low ESR/ESL capacitor located as close to
the controller as possible.
Optional input for an externally supplied bias supply. If the voltage at the VCCX pin is greater than 3.9V, the
internal VCC regulator is disabled and the VCC pin is internally connected to VCCX pin supply. If VCCX is not
used, connect to AGND.
High side gate driver supply used in bootstrap operation. The bootstrap capacitor supplies current to charge
the 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
inductance path.
Buck MOSFET source pin. Connect to the source terminal of the high side buck MOSFET and the bootstrap
capacitor.
Solder to the ground plane under the IC to aid in heat dissipation.
3
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