ADI Launches Regulator Suited for High Step-Down Ratios
Published2017.06.28 13:19Analog Devices has introduced new high-efficiency 4MHz synchronous dual-output buck regulators, the LTC3636 and LTC3636-1, which integrate a phase-locked switching frequency with a proprietary fixed frequency/on-time, current-mode control circuit topology.
The new products deliver a continuous output current of up to 6A from each channel or generate a two-phase single output of up to 12A. Through a compact 4mm x 5mm QFN package, they provide output voltages as low as approximately 0.6V.
The LTC3636/-1 operates in an input voltage range of 3.1V to 20V, with the output voltage sensing range being 0.6V to 5V for the LTC3636 and 1.8V to 12V for the LTC3636-1, making them ideal for dual-cell lithium-ion battery applications and 5V and 12V intermediate bus systems.
Each channel of the LTC3636/-1 delivers 95% efficiency through internal switches with RDS(ON) as low as 32mΩ and 18mΩ. The proprietary control architecture enables the duty cycle to be maintained at approximately 5% and the switching frequency at up to 2.25MHz, making it suitable for high step-down ratio applications such as converting 12VIN to 1.8VOUT.
For applications requiring noise minimization, the LTC3636/-1 can be configured to operate in forced continuous mode, which reduces supply ripple and potential RF interference. Additionally, it supports various features including die temperature monitoring, power good voltage monitoring, output voltage tracking, independent soft-start capability per channel, short-circuit protection, and input overvoltage and overtemperature protection.
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