POWER LP3809A-14B3F Micro-power voltage detectors, reset of mcu with delay time Datasheet

LP3809
Micro-Power Voltage Detectors,
Reset Of MCU With Delay Time
General Description
Features
The LP3809 is a micro-power voltage
detector supervising the power supply
voltage level for microprocessors (µP) or
digital systems. It provides internally fixed
threshold levels with 0.1V per step ranging
from 1.2V to 5V, which covers most digital
applications. It features low supply current of
3µA. The LP3809 performs supervisory
function by sending out a reset signal
whenever the VDD voltage falls below a
preset threshold level. This reset signal will
last the whole period before VDD recovering.
Once VDD recovered upcrossing the
threshold level, the reset signal will be
released after a certain delay time. Available
in the 5-lead of SOT-23 packages.
Pin Configurations
Built-in Recovery Delay Include 210ms
Internally Fixed Threshold 1.2V to 5V in
0.1V Step
No External Components Required
High Accuracy 1.5%
Low Supply Current 3 A
Low Functional Supply Voltage 0.9V
N-Channel Open-Drain output
Quick Start-Up
Applications
Computers
CPU/MCU/DSP
Portable
Battery-Powered Equipment
Ordering Information
LP3809□ - □ □ □ □ □
Pin No.
Type A
Type B
SOT-23
1
RESET
GND
2
GND
RESET
Type
A: Type A
B: Type B
3
VDD
VDD
F:PB-Free
Package
B3: SOT-23
Output Voltage:
12: 1.2V
13: 1.3V
50: 5.5V
Typical Application Circuit
LP3809-datasheet
Oct.-2004
Note:
1. Output Voltage range from 1.2V to 5.0V in
0.1V increments.
2. 2.7V output order is LP3809A-27B3F.
1-1
LP3809
Functional Pin Description
Pin Name Pin Function
GND
Ground
RESET
Active Low Open-Drain Reset Output
VDD
Power Pin
Function Block Diagram
Absolute Maximum Ratings
Supply Input Voltage---------------------------------------------------------------------------------------------------6V
Power Dissipation, PD @ TA = 25°C
SOT-23 --------------------------------------------------------------------------------------------------------------------400mW
Package Thermal Resistance
SOT-23, θJA -------------------------------------------------------------------------------------------------------------250°C/W
ESD Susceptibility
HBM (Human Body Mode) ---------------------------------------------------------------------------------------------2kV
MM(Machine-Mode)-----------------------------------------------------------------------------------------------------200V
Recommended Operating Conditions
Supply Input Voltage-----------------------------------------------------------------------------0.3V to 6V
Operation Ambient Temperature Range------------------------------------------------−40°C to 85°C
Electrical Characteristics
Parameter
Symbol
Test Conditions
Min
Typ
Max
Units
Quiescent Current
IQ
VEN ≥ 1.2V, IOUT =
0mA
Reset Threshold
VTH
TA = 27°C
Threshold Voltage Accuracy
ΔVTH
VDD Drop to Reset Delay
Trd
Drop = VTH -125mV
20
uS
Reset Active Time
LP3809A/B
VDD ≥ 1.02×VTH
210
mS
RESET Output Voltage Low
VOL
3 = VDD < VTH ISINK
>3.5mA
0.4
V
Thermal Shutdown
Temperature
TSD
165
°C
LP3809-datasheet
Oct.-2004
2-2
3
μA
1.2
1.5
V
-1.5
1.5
%
LP3809
Typical Operating Characteristics
LP3809-datasheet
Oct.-2004
3-3
LP3809
LP3809-datasheet
Oct.-2004
4-4
LP3809
LP3809-datasheet
Oct.-2004
5-5
LP3809
Package Information
LP3809-datasheet
Oct.-2004
6-6
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