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 12V, 5V and 3.3V 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 is guaranteed from -40°C 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.
The LTM4642 can be synchronized to a supplied clock with a frequency ranging from 600 kHz to 1.4 MHz. 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 operates from -40°C to 125°C and is priced at $19.43 (1000).
Linear Technology; www.linear.com/product/LTM4642