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LM5118Q1MHX/NOPB
75V Wide Vin Buck-Boost Controller
VIN VCC
VOUT
IEN
1 AMP
3 AMP
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LM5118-Q1SNVSAX9 –JUNE 2017
LM5118-Q1 Wide Voltage Range Buck-Boost Controller Features AEC-Q100 Qualified for Automotive Applications Device Temperature Grade1: –40°Cto
+125°C Ambient Operating Temperature Device HBM ESD Classification Level2 Device CDM ESD Classification Level C6 Ultra-Wide Input Voltage Range From3Vto75V Emulated Peak Current Mode Control Smooth Transition Between Step-Down and Step- Modes Switching Frequency Programmableto 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) Createa Custom Design Using the LM5118-Q1
With the WEBENCH® Power Designer
Applications Automotive Infotainment Automotive Start and Stop Systems Industrial Buck-Boost Supplies
DescriptionThe LM5118-Q1 wide voltage range Buck-Boost
switching regulator controller features all of the
functions necessary to implement a high-
performance, cost-efficient Buck-Boost regulator
usinga minimumof external components. The Buck-
Boost topology maintains output voltage regulation
when the input voltageis either less thanor greater
than the output voltage, makingit especially suitable
for automotive applications. The LM5118-Q1
operates asa buck regulator while the input voltage sufficiently greater than the regulated output
voltage and gradually transitionsto the buck-boost
mode as the input voltage approaches the output.
This dual-mode approach maintains regulation overa
wide rangeof input voltages with optimal conversion
efficiencyin the buck mode anda 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
methodis based upon current mode control using an
emulated current ramp. Emulated current mode
control reduces noise sensitivityof the pulse-width
modulation circuit, allowing reliable controlof the very
small duty cycles necessaryin high input voltage
applications. Additional protection features include
current limit, thermal shutdown and an enable input.
The deviceis availableina power-enhanced, 20-pin
HTSSOP package featuring an exposed die attach
padto aid thermal dissipation.
Device Information(1)(1) Forall available packages, see the orderable addendumat
the endofthe data sheet.
Simplified Schematic Efficiencyvs VIN and IOUT, VOUT=12V
