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 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.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM5118 Wide Voltage Range Buck-Boost Controller datasheet (Rev. J) | PDF | HTML | 30 Jun 2017 |
| White paper | Understanding Functional Safety FIT Base Failure Rate Estimates per IEC 62380 and SN 29500 (Rev. A) | PDF | HTML | 30 Apr 2024 | |
| White paper | Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) | 10 Apr 2019 | ||
| Technical article | Learn how to keep your car battery steady and running longer | PDF | HTML | 28 Mar 2017 | |
| Analog Design Journal | Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics | 21 Jul 2016 | ||
| Application note | Maintaining Output Voltage Regulation During Automotive Cold-Crank with LM5118 | 27 Jul 2015 | ||
| EVM User's guide | AN-1819 LM5118 Evaluation Board (Rev. B) | 17 Jan 2014 | ||
| White paper | Wide VIN power management ICs simplify white paper (Rev. A) | 19 Sep 2013 | ||
| User guide | AN-2178 LM5118 Four Switch Conversion (Rev. E) | 06 May 2013 |
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