LTC2953CDD-2 12-Lead DFN Push Button On/Off Controller with Voltage Monitoring
The LTC2953CDD-2 is a push button on/off controller that manages system power through a momentary front panel switch. A debounced interrupt output reports button activity to the processor, so the same button can be used for menu functions and for a controlled shutdown, while the enable output actually switches the supply.
The part runs from 2.7 V to 27 V and draws 14 microamps, which keeps it alive from a small always-on rail in battery powered and portable equipment. The push button input withstands plus or minus 10 kilovolts of human body model ESD, so it can be routed to an exposed panel switch without extra protection.
A power fail comparator with a 0.5 V reference warns the processor before the input collapses, and a separate undervoltage lockout comparator latches the system off gracefully rather than letting it run through brownout. The supply monitor input is compared against the same 0.5 V reference, with 1.5 percent threshold tolerance, and the reset output stays low until the monitored rail has been good for 200 ms.
This is the -2 version, whose enable output is a high voltage open-drain pin rated to 50 V. It can drive the gate of a circuit breaker MOSFET or the shutdown pin of a hot swap controller directly, without an external level shift, which suits -48 V and telecom style power paths. A capacitor on the PDT pin sets how long the button must be held before power is removed, and the KILL input provides an immediate hardware shutdown from a processor or a thermal sensor.
The LTC2953CDD-2 is the commercial grade part in the 12-Lead (3mm x 3mm) Plastic DFN package, specified from 0 to 70 degrees C. It is RoHS compliant and lead free, every order ships with full traceability, and samples and volume pricing are available on request.
Company Profile
Shenzhen Mingjiada Electronics Co., Ltd. is an independent distributor of electronic components from established manufacturers. Founded in Shenzhen in 1996, Mingjiada has established branches in Hong Kong, Japan, Russia, and Taiwan.
Certified under ISO9001:2014 for quality management systems and ISO14001:2014 for environmental management systems. With an experienced team in sales, R&D and management, we specialize in distributing products from more than 500 established suppliers.
Adhering to the principle of "maximizing benefits for customers," we offer comprehensive product ranges and provide high-quality, responsive service through professional logistics and customer service teams.
Frequently Asked Questions
Are your LTC2953CDD-2 products new stock?
Yes. Every part we ship is new stock sourced through established supply channels, with full traceability.
Which package does the LTC2953CDD-2 use?
It is supplied in the 12-Lead (3mm x 3mm) Plastic DFN package, the commercial grade version specified from 0 to 70 degrees C.
What supply voltage range does the LTC2953CDD-2 support?
It operates from 2.7 V to 27 V with an absolute maximum VIN of 33 V, and draws 14 microamps typical.
What is the difference between the LTC2953-1 and LTC2953-2?
The -1 has a low leakage enable output for driving a DC/DC converter shutdown pin; the -2 has a high voltage enable output rated to 50 V for circuit breaker control.
How long must the button be held to power down?
A capacitor on the PDT pin sets the hold time, with an internal minimum delay, so accidental short presses do not remove power.
Does the LTC2953CDD-2 monitor the supply?
Yes. It has an adjustable supply monitor with 1.5 percent threshold tolerance and a 200 ms reset, plus a power fail comparator and a UVLO comparator.
How do you ship my order? Is it safe?
We use express carriers including DHL, FedEx, UPS, TNT, and EMS. We can also use your preferred forwarder. Products are carefully packaged to ensure safety, and we take responsibility for any damage to your order.
Your message must be between 20-3,000 characters!
English
