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TLV803E データシート(PDF) 20 Page - Texas Instruments

部品番号 TLV803E
部品情報  TLV803E, TLV809E, TLV810E Low Power 250-nA IQ and Small Size Supply Voltage Supervisors
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メーカー  TI [Texas Instruments]
ホームページ  http://www.ti.com
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TLV803E データシート(HTML) 20 Page - Texas Instruments

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TLV810EA29
VDD
GND
RESET
VDD
GND
ENABLE
Battery Charger
3 V
20
TLV803E, TLV809E, TLV810E
SLVSES2F – AUGUST 2018 – REVISED JUNE 2020
www.ti.com
Product Folder Links: TLV803E TLV809E TLV810E
Submit Documentation Feedback
Copyright © 2018–2020, Texas Instruments Incorporated
9.3 Typical Application
A typical use case for the push-pull active-high device variant TLV810E is overvoltage monitoring. The TLV810E
can monitor a power supply, a MCU power rail, or a battery during charging for example. The VDD pin monitors
the voltage rail and once VDD rises above VIT+, the RESET output deactivates to logic low after the reset delay
time tD. If VDD falls below VIT-, the RESET output activates to logic high after the propagation delay (tPD_HL). The
voiltage thresholds and the reset delay time depends on the device variant. See Device Comparison for device
variant naming nomenclature.
Figure 35. TLV810E Overvoltage Monitor Circuit for Battery Charger
9.3.1 Design Requirements
In this application design, the TLV810E device is monitoring a 3 V battery connected to a battery charger. The
battery charger turns on when the battery voltage is below 2.93 V and turns off once the battery charges to 2.96
V and remains above 2.96 V for at least 200 ms. The design must be low power and not consume more than 500
nA typical.
9.3.2 Detailed Design Procedure
Select the TLV810EA29 to accomplish this design. The TLV810EA29 is a push-pull active-high device with a VIT-
= 2.9 V and VIT+ = 2.9 + 1.2% = 2.93 V. Because the device is a push-pull output and the device threshold meets
the design requirements, no external resistors are needed. The TLV810EA29 device variant comes with 200 ms
reset delay time meaning VDD must be above VIT+ for at least 200 ms for the RESET output to transistion to
logic low to turn off the battery charger. This device meets the low power requirement because the TLV810E only
consumes 250 nA typical.


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