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DC/DC converter offers 60V transient protection

Posted: 12 Feb 2009 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC converter? power switch? protection transient?

Linear Technology Corp. has released the LT3509, a dual-channel current mode PWM step-down DC/DC converter with two internal 36V and 1A power switches.

Each channel is capable of delivering up to 700mA of output current with efficiencies up to 88 percent. Its wide input range of 3.6V to 36V, with transient protection to 60V makes it suitable for regulating power from a wide variety of sources, including unregulated wall transformers, 24V industrial supplies and automotive batteries. For automotive applications, the LT3509's minimum input voltage of 3.6V enables it to operate with sub-4V inputs paramount for automotive "cold crank" requirements. Similarly, the device's 36V continuous input capability with 60V transient protection enables it to withstand transients found in load-dump scenarios. The LT3509's 300kHz to 2.2MHz 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

In addition, the LT3509's low VCESAT (320mV @0.9A) internal switches offer efficiencies up to 88 percent, minimizing wasted heat. An internal 0.80V reference enables sub-1V output voltages required to power the latest generation of low voltage DSPs and microcontrollers. Low dropout internal switches enable duty cycles to reach 95 percent while internal cycle-by-cycle current limit provides protection against shorted outputs. The low current (The LT3509EDE is available in a thermally enhanced 3mm x 4mm DFN-14 whereas the LT3509EMSE is available in a thermally enhanced MSOP-16E package. Pricing starts at $2.95 and $3.05 each, respectively. Industrial temperature grades, LT3509IDE and LT3509IMSE, which are tested and guaranteed to operate from a -40C to 125C operating junction temperature are also available and are priced at $3.39 and $3.51 each, respectively. All versions are available from stock.

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