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Voltage monitors draw 6?A quiescent current

Posted: 31 Mar 2015 ?? ?Print Version ?Bookmark and Share

Keywords:Voltage monitors? low-dropout regulator?

The LTC2965 and LTC2966 low-dropout (LDO) regulators from Linear Technology may be used in commercial, industrial and automotive applications. The 3mm LDOS are 3.5V to 100V single and dual channel voltage monitors that draw 6?A of quiescent current.

Competing voltage monitoring solutions typically call for a low power comparator, a high input voltage LDO to power the comparator and a high value resistive divider to level translate the monitored rail, which both increase board space and power consumption, and decrease monitoring accuracy. The LTC2965 and LTC2966 avoid these pitfalls by integrating all components in a compact 3mm x 3mm package.

Each device includes resistor-programmable threshold inputs to facilitate simple under-voltage, over-voltage or window monitoring of positive or negative rails to within 1.4 per cent accuracy over temperature.

Linear Technology

In addition to high voltage inputs, the LTC2965 and LTC2966 include adjustable-polarity UV/OV comparator outputs that can go as high as 100V. All high voltage pins are rated to 140V, withstanding high voltage transients without damage. Integrated high value resistive dividers with selectable ratios offer improved accuracy, power savings and flexibility compared to solutions using external high value resistors. Threshold programming is achieved using low value discrete resistors in combination with configuration pins for scaling the comparator thresholds and setting output polarity.

A built-in buffered reference provides convenient low voltage biasing for the external resistive dividers. High and low threshold input pins provide for a flexible and wide hysteresis range by simply setting a different voltage on each pin. If the hysteresis value is not critical, one of the inputs can be grounded to select an internal default hysteresis voltage. The small size, wide operating range and low power consumption of the LTC2965 and LTC2966 are suited for a wide variety of applications, including battery-powered equipment, telecom systems and automotive and industrial electronics.

The LTC2965 and LTC2966 are available today in commercial, industrial and automotive versions, with operating temperature ranges from 0C to 70C, -40C to 85C, and -40C to 125C, respectively. The LTC2965 is offered in an 8-pin 3mm x 3mm DFN or MSOP-16 package and the LTC2966 is offered in a 16-pin 3mm x 3mm QFN or 20-lead SO package.

Pricing starts at $2.44 (LTC2966) and $1.98 (LTC2965) (each 1000).

- Graham Prophet
??EE Times Europe

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