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1 Features

? Undervoltage monitoring for power rails

– Reliable monitoring with high threshold

accuracy (1 typical)

– Fixed voltage threshold options from 0.9V to 5V

– Adjustable voltage option available (0.405)

– Separate Sense pin for monitoring and VDD pin

for power

– Device temperature grade 1: -40°C to +125°C

? Miniature solution with ultra-low power

consumption

– 0.6μA typical quiescent current

– Compact 6-pin SOT-23 package (2.99mm x

1.6mm)

? Highly configurable reset time delay to prevent

unsafe power on

– Adjustable from 1.25ms to 10s

? Separate Manual Reset Input (MR) to assert

RESET output on demand

2 Applications

? Rack server motherboard

? Electricity meter

? DC-input BLDC motor drive

? AC drive power stage module

? Surgical equipment

? Single board computer

3 Description

The TPS3808E family of microprocessor supervisory

circuits monitors system voltages from 0.4V to 5V,

asserting an open-drain RESET signal when the

SENSE voltage drops below a preset threshold

or when the manual reset (MR) pin drops to a

logic low. The RESET output remains low for the

user-adjustable delay time after the SENSE voltage

and manual reset (MR) return above the respective

thresholds.

The TPS3808E device uses a precision reference to

achieve 0.5 threshold accuracy. The reset delay

time can be set to 20ms by disconnecting the CT

pin, 300ms by connecting the CT pin to VDD using

a resistor, or can be user-adjusted between 1.25ms

and 10s by connecting the CT pin to an external

capacitor. The TPS3808E device has a very low

typical quiescent current of 0.6μA, and is designed

for battery-powered applications. The TPS3808E is

available in the SOT-23 (6) , and is fully specified over

a temperature range of –40°C to 125°C (TJ).