Each output is a synchronous buck converter operating at high efficiency. The operating efficiencies for delivering full current at a 1.8V load from input supplies of 12, 5 and 3.3 are 88, 91 and 93%, respectively.
The two 4A outputs can be current shared as a single 8A output with precision voltage regulation of ±1.5% over line and load variations and operates over a temperature range from -40 to +125°C. The LTM4642’s small footprint, high efficiency and dual-regulator design enables system designers to reduce PCB area or fit this point-of-load regulator into tight spaces on densely populated boards. Applications for the LTM4642 include industrial, robotic, medical, instrumentation and telecomms systems.
The LTM4642 can be synchronised to a supplied clock with a frequency ranging from 600kHz to 1.4MHz. Output ripple voltage is reduced because of the device’s 180° out-of-phase operation. Low package thermal impedance enables full load current up to +95°C ambient temperature with no airflow and +100°C with 200LFM when converting 12V to a 1V output.
The LTM4642 is priced at $19.43 each in 1,000 unit quantities.