Maxim Integrated Products Inc. (Sunnyvale, CA) presented its new MAX5042 two-switch, clamped pulse-width modulated (PWM) converter, for designers of small, isolated power supplies, which packs both a hot-swap controller and high-side and low-side power MOSFETs in a thermally enhanced, 56-pin QFN.
The hot-swap controller limits inrush current and the two-switch topology lowers the voltage on the MOSFETs. The device operates over an input-voltage range of 20 V to 76 V with the capability of stepping down a 48 V bus. Switching frequencies in excess of 500 kHz are possible via external control. Accommodating power supplies up to 50 W, the chip also allows both flyback and forward-converter topologies with voltage-mode or current-mode operation.
Other features include a look-ahead PWM signal for secondary-side, synchronous rectification; high-voltage startup regulators; external-frequency synchronization; remote shutdown; and thermal shutdown. Otherwise similar to the MAX5042, the MAX5043 is available without the hot-swap controller. Both devices operate in temperatures from -40 °C to +125 °C. Prices for the MAX5042 and MAX5043 are $5.25 and $4.67 each, respectively, for 1,000-unit quantities.
