LMR38020FDDAR

LMR38020FDDAR is the tape-and-reel HSOIC-8 (SO PowerPAD) ordering code for the Texas Instruments LMR38020 synchronous step-down converter, listed as ACTIVE in the datasheet package option addendum. The F in the code is the FPWM variant: forced PWM operation with no spread spectrum, where the S sibling is the spread-spectrum version without FPWM and FS combines both - the letter says nothing about frequency, which is set by the RT resistor across 200 kHz to 2.2 MHz for the whole family. It converts a 4.2 V to 80 V input with a feedback reference of 0.99 V minimum, 1.00 V typical and 1.01 V maximum under FPWM conditions, a high-side switch current limit of 2.6 A minimum, 3.2 A typical and 3.8 A maximum, and a -40 °C to +150 °C junction range. The selection point is a 2 A-class rail straight from 24 V, 48 V or battery buses that cannot tolerate pulse-skipping behaviour: FPWM keeps the switching frequency fixed at light load, which industrial and always-on loads with tight EMI or downstream sampling budgets prefer. Selection advice: do not carry the low quiescent-current figures of the PFM family members onto this code - the FPWM variant trades standby drain for frequency discipline, so budget its supply current from the FPWM electrical table. Parameters verified against the TI LMR38020 datasheet SNVSC40E (device comparison table, package option addendum and electrical characteristics).