150°C, 45V LDO has 3 µA quiescent current for automotive, industrial designs

December 15, 2014 // By Graham Prophet
A wider temperature range, FMEA-compliant, H grade version of the LT3007 high voltage, micropower, PNP-based LDO has an ultralow 3µA quiescent current. The device's H grade 150°C junction temperature rating enables high temperature or high power automotive and industrial applications.

A high input voltage capability, 2.0V to 45V with an adjustable output voltage ranging from 0.6V to 44.5V, enables operation in a wide range of applications. The LT3007's pinout is FMEA (Failure Mode Effects Analysis) compliant, so the output stays at or below the regulation voltage during an adjacent pin short event, or if a pin is left floating. The device's 3 µA quiescent and shutdown currents (<1 µA) enable ultralow standby power consumption, suiting the IC for applications not requiring shutdown, or those needing moderate output drive capability and high input voltage, such as remote monitoring and low-current battery-powered memory for "keep alive" systems requiring extended run times.

The LT3007 delivers up to 20 mA output current with a corresponding low dropout voltage of only 300 mV. Output voltage tolerance is tightly regulated to within ±2% over line, load and temperature. The IC optimises stability and transient response with low ESR, ceramic output capacitors as small as 2.2 µF. Internal protection circuitry includes reverse-battery protection, reverse output and reverse output-to-input protection, current limiting and thermal limiting.

The LT3007 is offered in E, I and H grades in an 8-lead SOT-23 package with three pins fused to ground for enhanced thermal performance in both fixed and adjustable versions. Pricing starts at $1.75 (1000) for the H grade.

Linear Technology; www.linear.com/product/LT3007