JAJSR90A September 2023 – July 2024 LMQ64480-Q1 , LMQ644A0-Q1 , LMQ644A2-Q1
PRODUCTION DATA
The LMQ644xx is a wide-input, synchronous, buck DC/DC converter for high-current single or dual outputs. The device uses an interleaved, stackable, current-mode control architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current sharing stackable up to six phases for higher output currents up to 36 A.
A high-side switch minimum on-time of 55 ns allows large step-down ratios, enabling the direct conversion from 12-V, 24-V, or automotive inputs to low-voltage rails for reduced system complexity and design cost. The LMQ644xx supports input voltage dips as low as 3 V, at nearly 100% duty cycle. If the minimum on-time or minimum off-time does not support the desired conversion ratio, the frequency is reduced. This action automatically allows regulation to be maintained during load dump and with very low dropout during cranking.
Power the bias of LMQ644xx from the output of the converter for lower input quiescent current and power loss. Achieving 9-μA no-load quiescent current in dual output configuration to extend operating run-time in battery-powered systems.
The LMQ644xx has been designed for low EMI. The device includes the following:
Reduction of noise at the fundamental switching frequency through interleaving
The device also includes the following features: