Features • LM5118Q is an Automotive Grade product that is AEC-Q100 grade 1 qualified (-40°C to 125°C operating junction temperature) • Ultra-wide input voltage range from 3V to 75V • Emulated peak current mode control • Smooth transition between step-down and step- up modes • Switching frequency programmable to 500KHz • 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 Description The 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 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 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 regulator’s control method is based upon current mode control utilizing 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 TSSOP-20 package featuring an exposed die attach pad to aid thermal dissipation.

LM5118   5.00 <= V in Lower  V   <= V in Upper  V   <= 75.00 V out 1.23 <=  V <= 70.00 I out    A <= 20.00 Ambient Temperature  °C <= 100 What are WEBENCH® tools? Also Recommended LM3478 Buck Or Boost Input Voltage With A SEPIC Configuration LM5116 100V Emulated Current Mode Buck Controller MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

Typical Application click for larger image	Block Diagram *click for larger image
Typical Performance click for larger image

Datasheet

Title		Size	Date	Other Language
	LM5118/LM5118Q Wide Voltage Range Buck-Boost Controller	524 Kbytes	17-Jul-09

Featured Application Notes

Title		Size	Date	Other Language
	AN-1819: Application Note 1819 LM5118 Evaluation Board	390 Kbytes	30-Apr-08

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	AN-1596: Application Note 1596 LM5116 Evaluation Board	299 Kbytes	18-May-07
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Design Tools

Title	Size	Date
LM5118 Quick Start Component Calculator	247 Kbytes	23-Jun-2008

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM5118MH	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5118MHX	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5118Q1MH	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5118Q1MHX	ABCD150XV1	0	3868	0	0	2595000	2	736338335

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

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