LMS33460
3V Under Voltage Detector
General Description
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.
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.
Features
nUltra low Power
n3.0V detection
nV
IN
Range: 0.8V to 7.0V
nOpen drain output
nUltra-small SC70-5 package
nExtended Temperature range (−40˚C to 85˚C)
nUltra Low Quiescent current (1µA typ)
Applications
nLow battery voltage detector
nPower Fail Indicator
nProcessor Reset Generator
nBattery Backup Control
nBattery Operated Equipment
nHand-held Instruments
Circuit Block Diagram
20020001
Typical Application
20020003
March 2001
LMS33460 3V Under Voltage Detector
© 2004 National Semiconductor Corporation DS200200 www.national.com
Typical Application (Continued)
20020003
Connection Diagram
SC70-5
20020002
Top View
Ordering Information
Package Part Number Package Marking Transport Media NSC
Drawing
5-Pin SC70-5 LMS33460MG C33 1k Units Tape and Reel MAA05A
LMS33460MGX 3k Units Tape and Reel
LMS33460
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage to GND 8.0V
Output Voltage to GND 8.0V
Output Continuous Output Current 30mA
Vapor Phase IR Convection Reflow 240˚C
ESD Rating (Note 4)
Human Body Model 2500V
Machine Model 200V
T
JMAX
(Note 3) 150˚C
θ
JA
(Note 3) 478˚C/W
Temperature Range
Operating Junction −40˚C to +85˚C
Storage Temperature Range −65˚C to +150˚C
Electrical Characteristics
Unless otherwise specified, all limits guaranteed for T
J
= 25˚C. Boldface limits apply at the temperature extremes.
Symbol Parameter Conditions Min Typ Max Units
V
DET
Detector Threshold V
IN
Falling 2.85 3.0 3.15 V
V
HYS
Detector Voltage Hysteresis V
IN
Rising 0.095 0.155 0.215 V
I
IN
Input Supply Current V
IN
= 2.87V – 1.0 2.2 µA
V
IN
= 4.7V – 1.2 3.6 µA
V
IN
= 7.0V (Note 3) – 25 200 µA
V
IN(MAX)
Maximum Operating Voltage – – 7.0 V
V
IN(MIN)
Maximum Operating Voltage
(Note 2)
0.7
1.0
1.1
1.3
V
I
OUT(LOW)
Output Current Low V
OUT
= 0.05V, V
IN
= 1.1V
V
OUT
= 0.50V, V
IN
= 1.5V
0.01
2
0.6
11
mA
T
pdHL
Output Delay Time
Output Transition
High to Low
C
L
= 10pF, R
L
= 470kΩ
– 70 130 µsec
∆V
DET
/∆T Detect Voltage Temperature
Coefficient
–±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, 1.5kΩin series with 100pF. Machine model, 0Ωin series with 200pF.
LMS33460
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Typical Characteristics
(T
A
= 25˚C, R
L
= 470kΩand C
L
= 10pF unless otherwise
noted).
Supply Current vs. Input Voltage Detector Threshold vs. Temperature
20020004 20020005
Output Current vs. Input Voltage Output Delay Time vs. Temperature
20020006 20020007
LMS33460
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Application Circuit Information
The LMS33460 is a micro power under voltage sensing
circuit with an open drain output configuration, which re-
quires a pull resistor.
The LMS33460 features a voltage reference, a comparator
with precise thresholds and built in hysteresis to prevent
erratic reset operation.
20020008
FIGURE 1. Propagation Delay
LMS33460
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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.
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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. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body, or
(b) support or sustain life, and whose failure to perform when
properly used in accordance with instructions for use
provided in the labeling, can be reasonably expected to result
in a significant injury to the user.
2. A critical component is any component of a life support
device or system whose failure to perform can be reasonably
expected to cause the failure of the life support device or
system, or to affect its safety or effectiveness.
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National Semiconductor certifies that the products and packing materials meet the provisions of the Customer Products Stewardship
Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned
Substances’’ as defined in CSP-9-111S2.
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LMS33460 3V Under Voltage Detector
