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1 Features

1? AEC-Q100 Qualified for Automotive Applications

– Device Temperature Grade 1: –40°C to

+125°C Ambient Operating Temperature

– Device HBM ESD Classification Level 2

– Device CDM ESD Classification Level C6

? Ultra-Wide Input Voltage Range From 3 V to 75 V

? Emulated Peak Current Mode Control

? Smooth Transition Between Step-Down and Step-

Up Modes

? Switching Frequency Programmable to 500 KHz

? Oscillator Synchronization Capability

? Internal High Voltage Bias Regulator

? Integrated High and Low-Side Gate Drivers

? Programmable Soft-Start Time

? Ultra-Low Shutdown Current

? Enable Input Wide Bandwidth Error Amplifier

? 1.5% Feedback Reference Accuracy

? Thermal Shutdown

? Package: 20-Pin HTSSOP (Exposed Pad)

? Create a Custom Design Using the LM5118-Q1

With the WEBENCH? Power Designer

2 Applications

? Automotive Infotainment

? Automotive Start and Stop Systems

? Industrial Buck-Boost Supplies

3 Description

The LM5118-Q1 wide voltage range Buck-Boost

switching regulator controller features all of the

functions necessary to implement a highperformance,

cost-efficient Buck-Boost regulator

using a minimum of external components. The Buck-

Boost topology maintains output voltage regulation

when the input voltage is either less than or greater

than the output voltage, making it especially suitable

for automotive applications. The LM5118-Q1

operates as a buck regulator while the input voltage

is sufficiently greater than the regulated output

voltage and gradually transitions to the buck-boost

mode as the input voltage approaches the output.

This dual-mode approach maintains regulation over a

wide range of input voltages with optimal conversion

efficiency in the buck mode and a glitch-free output

during mode transitions. This easy-to-use controller

includes drivers for the high-side buck MOSFET and

the low-side boost MOSFET. The regulators control

method is based upon current mode control using an

emulated current ramp. Emulated current mode

control reduces noise sensitivity of the pulse-width

modulation circuit, allowing reliable control of the very

small duty cycles necessary in high input voltage

applications. Additional protection features include

current limit, thermal shutdown and an enable input.

The device is available in a power-enhanced, 20-pin

HTSSOP package featuring an exposed die attach

pad to aid thermal dissipation.