LM5118MHX/NOPB ,3-75V Wide Vin, Current Mode Non-Synchronous Buck-Boost Controller 20-HTSSOP -40 to 125features all of the• Emulated Peak Current Mode Controlfunctions necessary to implement a high-• Sm ..
LM5118MHX/NOPB ,3-75V Wide Vin, Current Mode Non-Synchronous Buck-Boost Controller 20-HTSSOP -40 to 125 SNVS566J–APRIL 2008–REVISED JUNE 2017• Added Equation 20 ..... 28• Changed Equation 21 . 28• Chang ..
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LM5118MHX/NOPB
75V Wide Vin Buck-Boost Controller
VIN VCC
VOUT
IEN
1 AMP
3 AMP
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LM5118SNVS566J–APRIL 2008–REVISED JUNE 2017
LM5118 Wide Voltage Range Buck-Boost Controller Features 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 With
the WEBENCH® Power Designer
ApplicationsIndustrial Buck-Boost Supplies
DescriptionThe LM5118 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 operatesas buck regulator while the input voltageis 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 method 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
