MAX6457UKD0A+T Maxim Integrated Products, MAX6457UKD0A+T Datasheet

IC SUPPLY VOLT MONITR SOT23-5

MAX6457UKD0A+T

Manufacturer Part Number
MAX6457UKD0A+T
Description
IC SUPPLY VOLT MONITR SOT23-5
Manufacturer
Maxim Integrated Products
Type
Simple Reset/Power-On Resetr
Datasheet

Specifications of MAX6457UKD0A+T

Number Of Voltages Monitored
1
Output
Open Drain or Open Collector
Reset
Active Low
Reset Timeout
50 µs Typical
Voltage - Threshold
Adjustable/Selectable
Operating Temperature
-40°C ~ 125°C
Mounting Type
Surface Mount
Package / Case
SOT-23-5, SC-74A, SOT-25
Undervoltage Threshold
1.155 V
Overvoltage Threshold
1.255 V
Supply Voltage (max)
28 V
Supply Voltage (min)
4 V
Supply Current (typ)
6.5 uA (Typ)
Operating Temperature Range
+ 125 C
Mounting Style
SMD/SMT
Manual Reset
Not Resettable
Watchdog
No Watchdog
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Other names
MAX6457UKD0A+T
MAX6457UKD0A+TTR
The MAX6457–MAX6460 high supply voltage, low-power
voltage monitors operate over a 4V to 28V supply voltage
range. Each device includes a precision bandgap refer-
ence, one or two low-offset voltage comparators, internal
threshold hysteresis, power-good or reset timeout
options, and one or two high-voltage open-drain outputs.
Two external resistors (three for window detection) set the
trip threshold voltages.
The MAX6457 is a single voltage monitor for undervoltage
or overvoltage detection. A logic-based clear input either
latches the output for overvoltage applications or allows
the device to operate in transparent mode. The MAX6458
includes two comparators (one overvoltage and one
undervoltage) for window detection and a single output to
indicate if the monitored input is within an adjustable volt-
age window. The MAX6459 includes dual overvoltage/
undervoltage comparators with two independent com-
parator outputs. Use the MAX6459 as a window com-
parator with separate undervoltage and overvoltage
outputs or as two independent, single voltage monitors.
The MAX6460 includes a single comparator and an inter-
nal reference, and can also accept an external reference.
The inverting and noninverting inputs of the comparator
are externally accessible to support positive or negative
voltage monitors and to configure the device for active-
high or active-low output logic.
The MAX6457/MAX6458 offer fixed timing options as a
voltage detector with a 50µs typical delay or as a reset cir-
cuit with a 90ms minimum reset timeout delay. The moni-
tored input must be above the adjusted trip threshold (or
within the adjusted voltage window for the MAX6458) for
the selected timeout period before the output changes
state. The MAX6459/MAX6460 offer only a fixed 50µs
timeout period. Internal threshold hysteresis options (0.5%,
5%, and 8.3% for the MAX6457/MAX6458/MAX6459, and
0.5% for the MAX6460) reduce output chatter in noise-
sensitive applications. Each device is available in a small
SOT23 package and specified over the extended temper-
ature range of -40°C to +125°C.
19-2534; Rev 4; 3/09
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
High-Voltage, Low-Current Voltage Monitors in
Undervoltage Monitoring/Shutdown
Overvoltage Monitoring/Protection
Window Voltage Detection Circuitry
Multicell Battery-Stack Powered Equipment
Notebooks, eBooks
Automotive
Industrial
Telecom
Networking
________________________________________________________________ Maxim Integrated Products
General Description
Applications
o Wide Supply Voltage Range, 4V to 28V
o Internal 2.25V ±2.5% Reference
o Low Current (3.5µA, typ at 12V)
o Open-Drain n-Channel Output (28V Compliant)
o Internal Threshold Hysteresis Options
o Two IN-to-OUT Timeout Period Options
o Internal Undervoltage Lockout
o Immune to Short Voltage Transients
o Small SOT23 Packages
o Few External Components
o Fully Specified from -40°C to +125°C
Note: The MAX6457/MAX6458/MAX6459 are available with
factory-trimmed internal hysteresis options. The MAX6457 and
MAX6458 offer two fixed timing options. Select the desired hys-
teresis and timing options using Table 1 or the Selector Guide at
the end of the data sheet, and enter the corresponding letters
and numbers in the part number by replacing “_ _” or “_”. These
devices are offered in tape-and-reel only and must be ordered in
2500-piece increments.
Devices are available in both leaded and lead(Pb)-free/RoHS-
compliant packaging. Specify lead(Pb)-free by replacing “-T”
with “+T” when ordering.
Pin Configurations appear at end of data sheet.
MAX6457UKD_ _-T
MAX6458UKD_ _-T
MAX6459UT_-T
MAX6460UT-T
(0.5%, 5%, 8.3%)
(50µs, 150ms)
CHARGER
BATTERY
PART
BATTERY
5-CELL
STACK
Li+
+21V (NOMINAL)
Typical Operating Circuit
R1
R2
SOT Packages
Ordering Information
IN+
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
TEMP RANGE
GND
MAX6457
V
CC
CLEAR
OUT
IN
R
PULLUP
Features
PIN-PACKAGE
5 SOT23
5 SOT23
6 SOT23
6 SOT23
CONVERTER
DC-DC
SHDN
LOAD
OUT
1

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MAX6457UKD0A+T Summary of contents

Page 1

... Multicell Battery-Stack Powered Equipment Notebooks, eBooks Automotive Industrial Telecom Networking ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. SOT Packages o Wide Supply Voltage Range 28V o Internal 2.25V ±2.5% Reference o Low Current (3.5µ ...

Page 2

High-Voltage, Low-Current Voltage Monitors in SOT Packages ABSOLUTE MAXIMUM RATINGS , OUT, OUTA, OUTB, CLEAR to GND ..........-0.3V to +30. IN+, IN- to GND..........................................-0. REF to GND..............-0.3V to the lower of +6V and (V Input Currents ...

Page 3

High-Voltage, Low-Current Voltage Monitors in ELECTRICAL CHARACTERISTICS (continued 28V -40°C to +125°C, unless otherwise specified. Typical values are PARAMETER SYMBOL Output Voltage Low V OL Output Leakage Current I LKG ...

Page 4

High-Voltage, Low-Current Voltage Monitors in SOT Packages (GND = 10kΩ, and T = +25°C, unless otherwise noted.) PULLUP A SUPPLY CURRENT vs. SUPPLY VOLTAGE +125° +25° ...

Page 5

High-Voltage, Low-Current Voltage Monitors in (GND = 10kΩ, and T = +25°C, unless otherwise noted.) PULLUP A OUTPUT SHORT-CIRCUIT SINK CURRENT vs. TEMPERATURE 12V ...

Page 6

High-Voltage, Low-Current Voltage Monitors in SOT Packages PIN MAX6457 MAX6458 MAX6459 MAX6460 1 1 — — — 1 — — — — — — — — ...

Page 7

High-Voltage, Low-Current Voltage Monitors MAX6457 IN+ TIMEOUT OPTION HYSTERESIS OPTION 1.228V GND Figure 1. MAX6457 Functional Diagram V CC IN+ UV IN- OV HYSTERESIS OPTION 1.228V "UV": UNDERVOLTAGE "OV": OVERVOLTAGE GND Figure 3. MAX6459 Functional Diagram _______________________________________________________________________________________ ...

Page 8

High-Voltage, Low-Current Voltage Monitors in SOT Packages Detailed Description Each of the MAX6457–MAX6460 high-voltage (4V to 28V), low-power voltage monitors include a precision bandgap reference, one or two low-offset-voltage com- parators, internal threshold hysteresis, internal timeout period, and one or ...

Page 9

High-Voltage, Low-Current Voltage Monitors in >V TH+ IN+ <V TH CLEAR OUT Figure 7. Timing Diagram (MAX6457) Hysteresis adds noise immunity to the voltage monitors and prevents oscillation due to repeated triggering ...

Page 10

High-Voltage, Low-Current Voltage Monitors in SOT Packages V SUPPLY IN+ MAX6457– R2 100kΩ MAX6460 OUT CLEAR (OUTA FOR MAX6459) 1µF GND Figure 9. Overvoltage Shutdown Circuit (with External Pass MOSFET) Applications Information Undervoltage Lockout Figure 8 shows ...

Page 11

High-Voltage, Low-Current Voltage Monitors in remains high. When V exceeds V CC asserts low while OUTA remains high are given by the following equations: TRIPHIGH ⎛ TOTAL ⎜ TRIPLOW TH - ⎝ ...

Page 12

High-Voltage, Low-Current Voltage Monitors in SOT Packages Table 1. Factory-Trimmed Internal Hysteresis and Timeout Period Options PART MAX6457UKD_ _ -T MAX6458UKD_ _ -T MAX6459UT_ -T MAX6460UT-T PIN LATCHED PART COUNT OUTPUT MAX6457UKD0A-T 5 MAX6457UKD3A-T 5 MAX6457UKD0B-T 5 MAX6457UKD3B-T 5 MAX6457UKD0C-T ...

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High-Voltage, Low-Current Voltage Monitors in × TOTAL = TRIPLOW Ω 167 223 273 ...

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High-Voltage, Low-Current Voltage Monitors in SOT Packages Chip Information TRANSISTOR COUNT: 785 PROCESS: BiCMOS 14 ______________________________________________________________________________________ Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. PACKAGE TYPE PACKAGE CODE 5 SOT23 U5-1 6 SOT23 U5-1 ...

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... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 15 © 2009 Maxim Integrated Products ...

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