TPS38 datasheet(15/53 Pages) TI

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8 Detailed Description

8.1 Overview

The TPS38-Q1 is a family of high voltage and low quiescent current reset IC with fixed threshold voltage.

Voltage divider is integrated to eliminate the need for external resistors and eliminate leakage current that

comes with resistor dividers. However, it can also support external resistor if required by application, the lowest

threshold 800 mV (bypass internal resistor ladder) is recommenced for external resistors use case to take

advantage of faster detection time and lower ISENSE current.

VDD, SENSE and RESET pins can support 65 V continuous operation; both VDD and SENSE voltage levels can

be independent of each other, meaning VDD pin can be connected at 2.7 V while SENSE pins are connected to

a higher voltage. One thing of note, the TPS38-Q1 does not have clamps within the device so external circuits or

devices must be added to limit the voltages to the absolute max limit.

Additional features include programmable sense time delay (CTS1, CTS2) and reset delay time and manual

reset (CTR1 / MR, CTR2 / MR).

8.2 Functional Block Diagram

CTS2

VDD

SubReg

POR

CTR2 / MR

Sense

Delay

CTR1 / MR

CTS1

VRef Divider1

VRef Divider2

GND

Voltage

Divider

Voltage

Divider

RESET2

Output

Logic select

(High/Low)

Output

Logic select

(High/Low)

SENSE1

SENSE2

Manual

Reset

Delay

*Device Op ons

Boxes shaded in blue

See Device Nomenclature

RESET1

VDD

OV or UV

Select

REFERENCE

Sense

Delay

Manual

Reset

Delay

OV or UV

Select

Figure 8-1. Functional Block Diagram 1

1 Refer to Section 5 for complete list of topologies and output logic combination

www.ti.com

TPS38-Q1

SNVSBI8C – AUGUST 2020 – REVISED DECEMBER 2021

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