Dual Voltage Detector
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TPS3806J20 TPS3806I33
SLVS393A – JULY 2001 – REVISED NOVEMBER 2004
Dual Voltage Detector with Adjustable Hys...
Description
www.ti.com
TPS3806J20 TPS3806I33
SLVS393A – JULY 2001 – REVISED NOVEMBER 2004
Dual Voltage Detector with Adjustable Hysteresis
FEATURES
Dual Voltage Detector With Adjustable Hysteresis 3.3-V/Adjustable and 2-V/Adjustable
Assured Reset at VDD = 0.8 V Supply Current: 3 µA Typical at VDD = 3.3 V Independent Open-Drain Reset Outputs Temperature Range: -40°C to +85°C 6-Pin SOT-23 Package
DESCRIPTION
The TPS3806 integrates two independent voltage detectors for battery voltage monitoring. During power-on, RESET and RSTSENSE are asserted when supply voltage VDD or the voltage at LSENSE input become higher than 0.8 V. Thereafter, the supervisory circuit monitors VDD and LSENSE, keeping RESET and RSTSENSE active as long as VDD and LSENSE remain below the threshold voltage, VIT. As soon as VDD or LSENSE rise above the threshold voltage VIT, RESET or RSTSENSE is deasserted, respectively. The TPS3806 device has a fixed-sense threshold voltage VIT set by an internal voltage divider at VDD and an adjustable second-LSENSE input. In addition, an upper voltage threshold can be set at HSENSE to allow a wide adjustable hysteresis window.
The devices are available in a 6-pin SOT-23 package. The TPS3806 device is characterized for operation over a temperature range of -40°C to +85°C.
TPS3806 DBV PACKAGE
(TOP VIEW)
RSTSENSE 1
6 HSENSE
GND 2
5 LSENSE
RESET 3
4 VDD
3.6 V Li-lon
Cell
VDD RESET R1 TPS3806I33
LSENSE RSTSENSE
R2 HSENSE
GND
R3
R4 R5
Typical Operating Circuit
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