1

2

3

4

5

6

7

8

9

10

0.05

0.1

0.15

0.2

0.25

0.3

0.35

0.4

0.45

0.5

0.55

0.6

Iq_v

25°C

-40°C

125°C

LP3470A

VCC

GND

RESET

Microcontroller

VCC

RESET

LDO

IN

OUT

SRT

VCC1

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Now

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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

LP3470A

SNVSBF5B – JULY 2019 – REVISED NOVEMBER 2019

LP3470A Ultra Low Power Voltage Supervisor With Programmable Delay and 1% Reset

Threshold

1

1 Features

1

•

Pin-to-pin compatible with LP3470

•

5-Pin SOT-23 package

•

Open-drain RESET output

•

Programmable reset time-out period using an

external capacitor

•

Immune to short VCC transients

•

±1% Reset threshold accuracy (typical)

•

Ultra-low quiescent current (0.3 µA typical)

•

RESET valid down to VCC = 0.95 V

2 Applications

•

Critical µP and µC power monitoring

•

Intelligent instruments

•

Computers

•

Portable and battery-powered equipment

•

Building automation: building security system,

video surveillance

•

Factory automation: field transmitters, position

and proximity sensors

•

Motor drives

3 Description

The

LP3470A

device

is

a

micropower

voltage

supervisory circuit designed to monitor voltages

within 1% of reset threshold overtemperature and is

pin-to-pin compatible with existing TI device LP3470.

The LP3470A device provides accurate, nano-power

voltage monitoring with programmable delay.

The LP3470A asserts a reset signal whenever the

VCC supply voltage falls below a reset threshold. The

reset time-out period is adjustable using an external

capacitor. Reset remains asserted for an interval

(programmed by an external capacitor) after VCC has

risen above the threshold voltage plus hysteresis.

For information on available reset threshold voltage

options, see Mechanical, Packaging, and Orderable

Information.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LP3470A

SOT-23 (5)

1.60 mm × 2.90 mm

(1) For

all

available

packages,

see

the

Package

Option

Addendum at the end of the data sheet.

Basic Operating Circuit

Typical Supply Current for LP3470A