MAX6457–MAX6460
General Description
High-Voltage, Low-Current Voltage Monitors
in SOT Packages
Benefits and Features
●
●
●
●
●
●
●
●
●
●
●
●
Wide Supply Voltage Range, 4V to 28V
Internal 2.25V ±2.5% Reference
Low Current (3.5μA, typ at 12V)
Open-Drain n-Channel Output (28V Compliant)
Internal Threshold Hysteresis Options
(0.5%, 5%, 8.3%)
Two IN-to-OUT Timeout Period Options
(50μs, 150ms)
Internal Undervoltage Lockout
Immune to Short Voltage Transients
Small SOT23 Packages
Few External Components
Fully Specified from -40°C to +125°C
AEC-Q100 Qualified (MAX6459UTA/V+ only)
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
5 SOT23
5 SOT23
6 SOT23
6 SOT23
6 SOT23
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 reference,
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
voltage window. The MAX6459 includes dual overvoltage/
undervoltage comparators with two independent compar-
ator outputs. Use the MAX6459 as a window comparator
with separate undervoltage and overvoltage outputs or as
two independent, single voltage monitors. The MAX6460
includes a single comparator and an internal 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 moni-
tors 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 circuit with a 90ms minimum reset timeout delay.
The monitored 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 temperature range of -40°C to +125°C.
Ordering Information
PART
MAX6457UKD_
_-T
MAX6458UKD_
_-T
MAX6459UTA/V-T
MAX6459UT_/V+
MAX6460UT-T
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 let-
ters 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.
/V denotes an automotive qualified part.
Pin Configurations
appears at end of data sheet.
Typical Operating Circuit
BATTERY
CHARGER
+21V (NOMINAL)
IN
OUT
DC-DC
CONVERTER
SHDN
V
CC
R1
IN+
R2
GND
CLEAR
Applications
●
●
●
●
●
●
●
●
●
Undervoltage Monitoring/Shutdown
Overvoltage Monitoring/Protection
Window Voltage Detection Circuitry
Multicell Battery-Stack Powered Equipment
Notebooks, eBooks
Automotive
Industrial
Telecom
Networking
MAX6457
OUT
5-CELL
Li+
BATTERY
STACK
R
PULLUP
LOAD
19-2048; Rev 7; 7/17
MAX6457–MAX6460
High-Voltage, Low-Current Voltage Monitors
in SOT Packages
Absolute Maximum Ratings
V
CC
, OUT, OUTA, OUTB,
CLEAR
to GND ........-0.3V to +30.0V
IN+, IN- to GND
........................................ -0.3V to (V
CC
+ 0.3V)
REF to GND ...........-0.3V to the lower of +6V and (V
CC
+ 0.3V)
Input Currents (V
CC
, IN+, IN-)
...........................................20mA
Sink Current (OUT, OUTA, OUTB) .....................................20mA
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SOT23 (derate 7.1 mW/°C above +70°C) .........571mW
6-Pin SOT23 (derate 8.7 mW/°C above +70°C) .........696mW
Junction Temperature ......................................................+150°C
Operating Temperature Range ......................... -40°C to +125°C
Storage Temperature Range ............................ -65°C to +150°C
Lead Temperature (soldering, 10s) ................................. +300°C
Soldering Temperature (reflow)
Lead(Pb)-free...............................................................+260°C
Containing lead (Pb) ....................................................+240°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
(V
CC
= 4V to 28V, T
A
= -40°C to +125°C, unless otherwise specified. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Operating Voltage Range
Supply Current
SYMBOL
V
CC
I
CC
(Note 2)
V
CC
= 5V, no load
V
CC
= 12V, no load
V
CC
= 24V, no load
V
TH+
V
IN
rising
T
A
= -40°C to +85°C, V
CC
≥ 4V
T
A
= +85°C to +125°C, V
CC
≥ 4V
MAX645_U_D_A
Threshold Voltage
V
TH-
V
IN
falling
MAX645_U_D_B
MAX645_U_D_C
MAX64_ _U_D_A
MAX64_ _U_D_B
MAX64_ _U_D_C
V
IN
I
IN
(Note 2)
V
IN
= 1.25V, V
CC
= +28V
MAX645_UKD0_
MAX6459UT_
MAX6460UT
MAX6457 and MAX6458 only,
D3 option
V
CC
rising from GND to V
CC
≥ 4V in less than 1µs
(Note 3)
V
IL
V
IH
2
90
0
-55
50
150
2
0.4
210
T
A
= -40°C to +85°C
T
A
= +85°C to +125°C
T
A
= -40°C to +85°C
T
A
= +85°C to +125°C
T
A
= -40°C to +85°C
T
A
= +85°C to +125°C
1.195
1.170
1.180
1.155
1.133
1.111
1.093
1.071
0.5
5
8.3
V
CC
+55
V
nA
µs
ms
ms
V
%V
TH+
CONDITIONS
MIN
4
2
3.5
6.5
1.228
TYP
MAX
28
5
7.5
12.5
1.255
1.255
1.255
1.255
1.194
1.194
1.151
1.151
V
µA
UNITS
V
Threshold Voltage
Hysteresis
IN Operating Voltage Range
IN Leakage Current
OUT Timeout Period
t
TP
Startup Time
CLEAR
Input Logic Voltage
(MAX6457)
www.maximintegrated.com
Maxim Integrated │
2
MAX6457–MAX6460
High-Voltage, Low-Current Voltage Monitors
in SOT Packages
Typical Operating Characteristics
(GND = 0, R
PULLUP
= 10kΩ, and T
A
= +25°C, unless otherwise noted.)
MAX6457-60 toc01
MAX6457-60 toc02
TRIP THRESHOLD VOLTAGE (V)
8
I
CC
(µA)
6
4
2
0
T
A
= +125°C
T
A
= +25°C
1.21
1.19
1.17
1.15
1.13
1.11
V
TH
- (FALLING)
TRIP THRESHOLD VOLTAGE (V)
10
1.23
V
TH
+ (RISING)
1.23
1.21
1.19
1.17
1.15
1.13
1.11
V
TH
- (FALLING)
V
TH
+ (RISING)
T
A
= -40°C
4
10
16
V
CC
(V)
22
28
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TRIP THRESHOLD VOLTAGE (V)
1.23
1.21
1.19
1.17
1.15
1.13
1.11
V
TH
- (FALLING)
V
TH
+ (RISING)
MAX6457-60 toc04
10,000
1000
V
OL
(mV)
100
10
1
0.1
T
A
= +125°C
T
A
= +25°C
T
A
= -40°C
V
CC
= 12V
0.01
0.1
1
I
SINK
(mA)
10
100
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
www.maximintegrated.com
Maxim Integrated │
4
MAX6457-60 toc05
1.25
TRIP THRESHOLD VOLTAGE
vs. TEMPERATURE (8.3% HYSTERESIS)
100,000
OUTPUT LOW VOLTAGE
vs. OUTPUT SINK CURRENT
MAX6457-60 toc03
12
SUPPLY CURRENT vs. SUPPLY VOLTAGE
1.25
TRIP THRESHOLD VOLTAGE
vs. TEMPERATURE (0.5% HYSTERESIS)
1.25
TRIP THRESHOLD VOLTAGE
vs. TEMPERATURE (5% HYSTERESIS)
Embedded System
京公网安备 11010802033920号
EEWORLD
