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.