Pushbutton controller with supervisory functions

22 August 2007 Power Electronics / Power Management

Linear Technology has introduced the LTC2953-1, a high-reliability pushbutton controller that integrates supervisory voltage monitors and timers for tracking a switching regulator's input and output voltages. The device uses a power-fail input (PFI) comparator and under-voltage lockout (UVLO) comparator to trigger software and hardware control outputs when the input supply drops below two separate threshold voltages. An enable output forces the switching regulator's shutdown pin high when the input voltage drops below the UVLO threshold longer than an adjustable time period. The device also monitors the regulator's output and triggers a reset signal when the output voltage dips below an adjustable threshold due to excessive loading.

In addition to the input and output voltage comparators, this controller also includes a pushbutton input and software interrupt output. The LTC2953-1 combines these dual input, output and pushbutton functions in a tiny 3 mm x 3 mm DFN-12 package and is targeted for power path control, portable supervisors, PDAs and notebook computers.

Drawing only 14 μA of supply current, the LTC2953-1 operates over a wide 2,7 V to 27 V input supply range, serving single- or multibattery applications as well as industrial supply lines that operate from 24 V (±10% tolerance). The rugged pushbutton input is designed to operate in noisy environments and can withstand ESD strikes up to ±10 kV, per the human body model. A UVLO comparator gracefully latches power off, and the reset output remains low until the supply monitor input has been in compliance for 200 ms. The internal UVLO, PFI and voltage monitor comparators are accurate to 1,5% over the full temperature range of 0°C to 70°C and -65°C to 125°C for the commercial and industrial versions, respectively. A single capacitor controls the adjustable power-down timer in order to allow the system time to perform all of the necessary housekeeping procedures before shutting down.

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