LP3470A Ultra-low-power active-low reset IC with programmable delay and 1% reset threshold | TI.com

LP3470A
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Ultra-low-power active-low reset IC with programmable delay and 1% reset threshold

 

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.

Features

  • 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

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Parametrics

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Part number Order Threshold voltage 1 (Typ) (V) Number of supplies monitored VCC (Max) (V) VCC (Min) (V) Output driver type/reset output Time delay (ms) Features Rating Operating temperature range (C) Watchdog timer WDI (sec)
LP3470A Order now 2.63
2.75
2.93
3.08
3.65
4
4.38
4.63    
1     10     0.9     Active-low
Open-drain    
Programmable     Manual reset     Catalog     -40 to 125     None    
TPS3840 Order now Trimmable
1.8
2
2.2
2.5
2.7
2.8
2.9
3
4.3
4.5    
1     10     1.5     Active-high
Active-low
Open-drain
Push-pull    
Programmable     Manual reset     Catalog     -40 to 125     None