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Shown on this slide are some of the key features and benefits of the LT3088 and LT3089. Their wide SOA enables robustness, surge voltage tolerance, and facilitates high VIN/VOUT applications with less output power limitations. The precision 50µA current source reference allows VOUT operation down to 0V, plus the output errors and susceptibility to poor PCB cleaning are reduced. They offer excellent accuracy over temperature performance with a nearly “0” temperature coefficient. A single resistor programs output voltage, enabling easy design; the output voltage equals the reference current multiplied by the resistor value. Outputs may be easily and directly paralleled. This enables higher current capability than a single regulator may provide and spreads heat across a PCB. With a wide range of outputs down to 0V, VOUT can be adjusted below 1.2V with no circuit tricks. Temperature monitor is available on the LT3089 only. It monitors die junction temperature and outputs a current proportional to average die temperature, 25µA at 25°C with a 1µA/°C slope. The current monitor is also on the LT3089 only. This monitors system load current. The LT3089 features programmable current limit which allows the user to set current limit as low as 115% of maximum load without affecting normal operation load regulation. This reduces upstream power supply output current requirements. No CIN or COUT are required which is beneficial for intrinsic safety applications where magnetic or storage elements can arc, spark, or discharge quickly. Packages available include the small DFN and TSSOP packages that provide plenty of current in a small footprint with good thermal performance. The DD-Pak power package is good for mounting directly to the PCB for higher power dissipation. As noted The SOT-223 and DD-Pak for LT3088 is pin compatible with the LT1117.
