LMS33460 3V Under Voltage Detector General Description Features The LMS33460 is an under voltage detector with a 3.0V threshold and extremely low power consumption. The LMS33460 is specifically designed to accurately monitor power supplies. It is especially suited to battery powered systems where low quiescent current and small size are required. This IC generates an active output whenever the input voltage drops below 3.0 Volts. n n n n n n n This part uses a precision on-chip voltage reference and a comparator to measure the input voltage. Built in hysteresis helps to prevent erratic operation in the presence of noise. The UVD is available in the ultra-miniature SC70-5 package. Ultra low Power 3.0V detection VIN Range: 0.8V to 7.0V Open drain output Ultra-small SC70-5 package Extended Temperature range (−40˚C to 85˚C) Ultra Low Quiescent current (1µA typ) Applications n n n n n n Low battery voltage detector Power Fail Indicator Processor Reset Generator Battery Backup Control Battery Operated Equipment Hand-held Instruments Circuit Block Diagram 20020001 Typical Application 20020003 © 2004 National Semiconductor Corporation DS200200 www.national.com LMS33460 3V Under Voltage Detector March 2001 LMS33460 Typical Application (Continued) 20020003 Connection Diagram SC70-5 20020002 Top View Ordering Information Package 5-Pin SC70-5 Part Number Package Marking Transport Media NSC Drawing LMS33460MG C33 1k Units Tape and Reel MAA05A LMS33460MGX www.national.com 3k Units Tape and Reel 2 Human Body Model Machine Model If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Input Voltage to GND 2500V 200V TJMAX (Note 3) 150˚C θJA (Note 3) 478˚C/W 8.0V Output Voltage to GND 8.0V Output Continuous Output Current 30mA Vapor Phase IR Convection Reflow 240˚C Temperature Range Operating Junction −40˚C to +85˚C Storage Temperature Range ESD Rating (Note 4) −65˚C to +150˚C Electrical Characteristics Unless otherwise specified, all limits guaranteed for TJ = 25˚C. Boldface limits apply at the temperature extremes. Symbol Parameter Conditions Min Typ Max Units V VDET Detector Threshold VIN Falling 2.85 3.0 3.15 VHYS Detector Voltage Hysteresis VIN Rising 0.095 0.155 0.215 V IIN Input Supply Current VIN = 2.87V – 1.0 2.2 µA VIN = 4.7V – 1.2 3.6 µA VIN = 7.0V (Note 3) – 25 200 µA – – 7.0 V 0.7 1.0 1.1 1.3 V VIN(MAX) Maximum Operating Voltage VIN(MIN) Maximum Operating Voltage (Note 2) IOUT(LOW) Output Current Low TpdHL Output Delay Time Output Transition High to Low CL = 10pF, RL = 470kΩ ∆VDET/∆T VOUT = 0.05V, VIN = 1.1V VOUT = 0.50V, VIN = 1.5V Detect Voltage Temperature Coefficient 0.01 2 0.6 11 mA – 70 130 µsec – ± 120 – PPM/˚C Note 1: Absolute maximum ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device beyond its rated operating conditions. Note 2: Temperature range specifications is guaranteed by design. Note 3: Quiescent current will increase substantially above 5.5 volts, but is very low in the normal range below 5.5 volts. Note 4: Human body model, 1.5kΩ in series with 100pF. Machine model, 0Ω in series with 200pF. 3 www.national.com LMS33460 Absolute Maximum Ratings (Note 1) LMS33460 Typical Characteristics (TA = 25˚C, RL = 470kΩ and CL = 10pF unless otherwise noted). Supply Current vs. Input Voltage Detector Threshold vs. Temperature 20020005 20020004 Output Current vs. Input Voltage Output Delay Time vs. Temperature 20020006 www.national.com 20020007 4 The LMS33460 is a micro power under voltage sensing circuit with an open drain output configuration, which requires a pull resistor. 20020008 FIGURE 1. Propagation Delay 5 www.national.com LMS33460 The LMS33460 features a voltage reference, a comparator with precise thresholds and built in hysteresis to prevent erratic reset operation. Application Circuit Information LMS33460 3V Under Voltage Detector Physical Dimensions inches (millimeters) unless otherwise noted 5-Pin SC70-5 NSC Package Number MAA05A National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves the right at any time without notice to change said circuitry and specifications. For the most current product information visit us at www.national.com. LIFE SUPPORT POLICY NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein: 1. 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