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| LP3809 Micro-Power Voltage Detectors, Reset Of MCU With Delay Time General Description The LP3809 is a micro-power voltage detector supervising the power supply voltage level for microprocessors (P) 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 3A. 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. Features 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 Pin Configurations Ordering Information LP3809 - F:PB-Free Package B3: SOT-23 Output Voltage: 12: 1.2V 13: 1.3V Pin No. Type A Type B SOT-23 1 RESET GND 2 GND RESET 3 VDD VDD Type A: Type A B: Type B 50: 5.5V Typical Application Circuit Note: 1. Output Voltage range from 1.2V to 5.0V in 0.1V increments. 2. 2.7V output order is LP3809A-27B3F. LP3809-datasheet Oct.-2004 1-1 LP3809 Functional Pin Description Pin Name Pin Function GND RESET VDD Ground Active Low Open-Drain Reset Output Power Pin Function Block Diagram Absolute Maximum Ratings Supply Input Voltage---------------------------------------------------------------------------------------------------6V Power Dissipation, PD @ TA = 25C SOT-23 --------------------------------------------------------------------------------------------------------------------400mW Package Thermal Resistance SOT-23, JA -------------------------------------------------------------------------------------------------------------250C/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-------------------------------------------------40C to 85C Electrical Characteristics Parameter Quiescent Current Reset Threshold Threshold Voltage Accuracy VDD Drop to Reset Delay Reset Active Time RESET Output Voltage Low Thermal Shutdown Temperature Symbol IQ VTH VTH Trd LP3809A/B VOL TSD Drop = VTH -125mV VDD 1.02xVTH 3 = VDD < VTH ISINK >3.5mA Test Conditions VEN 1.2V, IOUT = 0mA TA = 27C 1.2 -1.5 20 210 0.4 165 Min Typ 3 1.5 1.5 Max Units A V % uS mS V C LP3809-datasheet Oct.-2004 2-2 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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