Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC2953-1 push-button controller
Edited by the Electronicstalk Editorial
Team on 11 October 2007
Push-button controller tracks voltages
The LTC2953-1 uses a power-fail input (PFI) comparator and undervoltage lockout comparator to trigger software and hardware control outputs when the input supply drops below threshold voltages.
Linear Technology has released 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 LTC2953-1 uses a power-fail input (PFI) comparator and undervoltage lockout (UVLO) comparator to trigger software and hardware control outputs when the input supply drops below two separate threshold voltages
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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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 LTC2953-1 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 push-button functions in a 3 x 3mm DFN-12 package and is designed for power path control, portable supervisors, PDAs and notebook computers.
Drawing only 14uA of supply current, the LTC2953-1 operates over a 2.7 to 27V input supply range, serving single or multi-battery applications as well as industrial supply lines that operate from 24V (+/-10% tolerance).
The rugged pushbutton input is designed to operate in noisy environments and can withstand ESD strikes up to +/-10kV.
A UVLO comparator latches power off and the reset output remains low until the supply monitor input has been in compliance for 200ms.
The internal UVLO, PFI and voltage monitor comparators are accurate to 1.5% over the full temperature range.
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.
The LTC2953-2 is a pin-compatible pushbutton controller with an active-low enable output. Request a free brochure from Linear Technology Corp ...
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