The LTM8057 and LTM8058 from Linear Technology Corp. are 1.5W output µModule® (micromodule) dc-to-dc converters with 2 kVAC galvanic isolation (production tested to 3 kVDC) in a 9 mm x 11.25 mm x 4.9 2mm BGA (ball grid array) package. The LTM8057 and LTM8058 include an isolated transformer, control circuitry, power switches and a modest amount of input and output capacitance. These µModule converters are UL60950 recognized components under file #464570. Both devices operate from an input voltage range of 3.1 V to 31 V, delivering a regulated output voltage on the secondary side, adjustable from 2.5 V to 12 V (LTM8057) and 1.2 V to 12 V (LTM8058). The LTM8058 includes a low noise linear post regulator that reduces the output ripple to 20 µVRMS at 300mA. Creepage and clearance distances support a working voltage up to 250V in a pollution degree 2 environment* for breaking ground loops in testers, servers, industrial automation, control and servo systems.
The LTM8057 maintains output voltage regulation accuracy of ±5% from -40 °C to +125 °C. The LTM8058's linear post regulator improves output voltage regulation to ±2.5% over the same temperature range. Additionally, the post regulator delivers the advantage of a low output ripple noise, improving the performance of high accuracy mixed signal converters and precision operational amplifiers. High DC/DC conversion efficiency and diligent package design support full output power at ambient temperatures up to 110°C.
The LTM8057 and LTM8058 are available in three temperature grades, E and I from -40 °C to +125 °C and MP for the -55 °C to +125 °C operating junction temperature range. All versions are available from stock. Pricing starts at $10.90 and $11.45 each for 1,000-piece quantities for the LTM8057 and LTM8058, respectively.