Emulated regulator controller offers best-in-class input range
Switching regulator provides 10 A from 3 to 75 V input for automotive, telecom, and battery-powered systems
Having a best-in-class operating voltage range of 3 to 75 V, the LM5118 emulated current-mode-controlled buck-boost dc/dc regulator controller targets automotive, telecom, and battery-powered systems. The controller features programmable switching frequency to 500 kHz, shutdown current, and transition between buck and buck-boost modes. It features peak efficiency of 95%.
The two-switch configuration enables design engineers to assemble a power converter with a wide input voltage range. It is well suited for powering a dashboard display, electronic controls such as antilock braking or fuel injection control, and microcontrollers used in cars. To ensure seamless control from electronic modules, the system operates at 4 V.
The device operates as a buck regulator when 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. It 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. The controller includes drivers for the high-side buck MOSFET and the low-side boost MOSFET. The emulated current-mode control reduces noise sensitivity of the PWM circuit. Additional protection features include current limit, thermal shutdown, and an enable input. It uses a 20-pin thermally enhanced TSSOP package. ($2.92 ea/1,000 — available now.)
National Semiconductor , Santa Clara , CA
Sales 800-272-9959
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