Linear Technology's Ultra-low Supply Current Monitors Suitable for Compact, Single-cell Applications

(Product News, 29 May 2008)

Linear Technology Corp. has released the LTC2934 and LTC2935 ultra-low power supply monitors that only draw 500nA of quiescent current. Battery life is of the utmost importance in portable applications, where it is essential to reduce the amount of supply current the device draws during normal and standby operation. It is important to minimize quiescent current in supporting power components like voltage monitors in an effort to prolong battery life. These LTC2934 and LTC2935 single-channel voltage monitors fulfill these functions in tiny 2x2mm DFN or ThinSOT packages, making them ideal for compact, single-cell applications.

The LTC2935 has three binary inputs that allow selection of one of eight integrated reset thresholds, from 3.3V down to 2.25V in 150mV increments. The device's internal precision attenuators allow the part to maintain only 0.5µA of supply current and accuracy. The LTC2934 allows an external resistive divider to finely set the reset threshold anywhere from 1.6V to 6V. The reset thresholds in both devices are ±1.5 percent accurate over temperature which helps to minimize supply overdesign. An early warning of a threatening low voltage condition is provided via a power-fail output. The supervisory circuits monitor VCC and pull the reset output low if the supply voltage drops below the configured reset threshold. The LTC2934 includes two reset timeout-periods of 15ms or 200ms, settable via a time-out selection pin, while the LTC2935 offers a fixed 200ms timeout. A manual reset pin is also provided on both devices for optional use of a pushbutton switch to force a system reset.

Click here for more information on Linear Technology's LTC2934 Ultra-low Power Adjustable Supervisor with Power-Fail Output

Click here for more information on Linear Technology's LTC2935 Ultra-low Power Supervisor with Power-Fail Output and Selectable Thresholds

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