Single package pin providing soft-start and short-circuit timer

Details Single package pin providing soft-start and short-circuit timer Single package pin providing soft-start and short-circuit timer

1999-08-26

2000-08-08

Sterrett, Jeffrey

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323280, G05F 1575

Patent

active

061006785

ABSTRACT:
Circuits and methods for implementing both a soft-start function and a short-circuit timer function in voltage regulator controller circuits using only a single package pin are provided. The soft-start and short-circuit timer functions are performed by measuring the voltage across an external capacitor as the capacitor is charged and discharged by a function control circuit. The soft-start function is performed by charging the capacitor from a completely discharged state using a current source in the function control circuit and by using the capacitor voltage as a current limit signal to gradually increase the current drawn from a voltage source to the normal operating level. The short-circuit timer function is performed by using the charge and discharge times of the capacitor to delay the shutdown of the voltage regulator in response to a short-circuit detection.

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Linear Technology Corporation, 1630 McCarthy Blvd., Milpitas CA 95035, "LTC1155, Dual High Side Micropower MOSFET Driver", <http://www.linear-tech.com>. Mar. 1999.
Linear Technology Corporation, 1630 McCarthy Blvd., Milpitas CA 95035, "LTC1435, High Efficiency Low noise Synchronous Step-Down Switching Regulator", <http://www.linear-tech.com>. Aug. 1996.
Linear Technology Corporation, 1630 McCarthy Blvd., Milpitas CA 95035, "LTC1438/LTC1439, Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators", <http://www.linear-tech.com>. Jan. 1997.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086, "Max1630-1635, Multi-Output, Low-Noise Power-Supply Controllers for Notebook Computers", <http://www.maxim-ic.com>. Apr. 1997.
Semtech Corporation, 652 Mitchell Road, Newbury Park, CA 91320, "SC1144, Programmable, High Performance Multi-Phase, PWM Controller", <http://www.semtech.com>. Aug. 1999.

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