2MHz, 1.2A (IOUT) 36V Step-Down DC/DC Converter in 3mm x 3mm DFN Package

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Linear Technology Corporation announces the LT3505, a current mode PWM step-down DC/DC converter with an internal 1.75A power switch, packaged in a tiny 8-lead 3mm x 3mm DFN package. Its wide input range of 3.6V to 36V and capability to withstand 40V transients makes the LT3505 ideal for regulating power from a wide variety of sources, including unregulated wall transformers, 24V industrial supplies and automotive batteries. For automotive applications, the LT3505's minimum input voltage of 3.6V enables it to operate with sub-4V inputs, paramount for meeting automotive "cold crank" requirements. Similarly, its 40V input capability enables it to withstand transients found in load-dump conditions. Its 200kHz to 3MHz switching frequency is user programmable, enabling it to maximize efficiency while using tiny, low cost inductors and ceramic capacitors, resulting in low predictable output ripple.

The LT3505's low VCESAT (350mV @1A) internal switch offers efficiencies of over 90%, maximizing battery run-time. Its internal reference enables output voltages as low as 0.78V. Internal cycle-by-cycle current limit provides protection against shorted outputs while soft-start eliminates input current surge during start-up. The low current (
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