Crank it down
14 April 2009
Step-down DC/DC converter suitable for high temperature applications.
The H-grade version of the LT3509, a dual channel, current mode PWM step-down DC/DC converter with two internal 36 V, 1 A power switches in an MSOP-16E package were released by Linear Technology. The H-grade version is tested to a maximum junction temperature of +150°C, compared to the E- and I-grade versions' +125°C maximum junction temperature. All electrical specifications are identical for the E-, I- and H- grade versions. The LT3509 H-grade is suitable for automotive and industrial applications which are subjected to high ambient temperatures.
For automotive applications, the LT3509's minimum input voltage of 3.6 V enables it to operate with sub-4 V, inputs paramount for automotive cold crank requirements. Similarly, the device's 36 V continuous input capability with 60 V transient protection enables it to withstand transients found in load-dump scenarios. The LT3509's 300 kHz to 2.2 MHz switching frequency is user programmable, enabling it to maximise efficiency while using low cost inductors and ceramic capacitors, resulting in low, predictable output ripple.
Each channel of the LT3509 is capable of delivering up to 700 mA of output current with efficiencies up to 88%. Its input range of 3.6 V to 36 V, with transient protection to 60 V, makes it suitable for regulating power from a variety of sources, including unregulated wall transformers, 24 V industrial supplies and automotive batteries.
The LT3509HMSE is available from stock in a 16-lead thermally enhanced MSOP package.
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