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Linear regulator offers fast transient response

Posted: 23 Jun 2011 ?? ?Print Version ?Bookmark and Share

Keywords:ÿlinear regulator? low dropout? fast transient response?

Linear Technology Corp. has rolled out the LT3015, a 1.5A negative low dropout linear regulator featuring fast transient response, low noise, and precision current limit.

With its wide input voltage range of -1.8V to -30V and adjustable output voltage from -1.220V to -29.5V, the device's common emitter NPN power transistor design requires a single supply and enables a low dropout voltage of 310mV (typical at full load). Output voltage noise is 60?Vrms over a 10Hz to 100kHz bandwidth.

The LT3015 features operating current of 1.1mA and The LT3015's reference-amplifier topology provides precision DC characteristics, as well as good loop stability with a wide range of output capacitors, including small, low cost ceramic output capacitors. It is stable with a 10?F output capacitors that can be used without the necessary addition of series resistance (ESR) as is common with many other regulators. The LT3015 exhibits bidirectional shutdown capability that allows the device to operate with either positive or negative logic levels.

Due to the LT3015's high shutdown threshold accuracy, the SHDN pin can be used to set a programmable undervoltage lockout (UVLO) threshold for the regulator input supply. Internal protection circuitry for the IC includes reverse-output protection, precision current limiting with fold back to keep the power transistor in its safe operating area, and thermal limiting with hysteresis.

The LT3015 is available in a low profile (0.75mm) 3 x 3mm 8-lead DFN with backside thermal pad, a 12-lead MSOP package with backside thermal pad, a through-hole power TO-220 package, and a surface mount power DD-Pak package. E- and I-grade operating junction temperature is -40C to 125C, and the MP grade is specified from -55C to 125C.

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