Step-down convertor takes power switch onboard

A new current mode PWM step-down DC/DC convertor comes with an internal 1.9A power switch, packaged in a tiny 8-lead thermally enhanced MSOP package.

Linear Technology has developed the LT1936, a current mode PWM step-down DC/DC convertor with an internal 1.9A power switch, packaged in a tiny 8-lead thermally enhanced MSOP package.

Its wide input range of 3.6 to 36V makes the LT1936 suitable for regulating power from a wide variety of sources, including unregulated wall transformers, 24V industrial supplies and automotive batteries.

For automotive applications, the device can easily operate with sub-4V inputs, which is required for automotive "cold crank" conditions.

Its 500kHz operating frequency allows the use of tiny, low cost inductors and ceramic capacitors, resulting in low, predictable output ripple.

The LT1936's low-saturation-voltage (410mV at 1.2A) internal switch ensures efficiencies as high as 88%, maximising battery run-time.

Cycle-by-cycle current limit provides protection against shorted outputs, and soft-start eliminates input current surge during start up.

A low current (sub-2uA) shutdown mode provides easy power management in battery-powered systems.

The LT1936EMS8E is available from stock in a thermally enhanced MSOP-10 package.

A higher temperature grade version, the LT1936IMS8E, is also available from stock.

Pricing starts at $2.85 each and $3.42 each, respectively, for 1000-piece quantities.

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