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MAX1807 Datasheet

  • MAX1807

  • Micropower Adjustable Overvoltage Protection Controllers

  • 1頁

  • Maxim   Maxim

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19-1791; Rev 0; 10/00
Micropower Adjustable Overvoltage
Protection Controllers
General Description
The MAX1807/MAX1808 monitor up to five supply rails
for an overvoltage condition and provide a latched out-
put when any one of the five supplies exceeds the trip
thresholds. The latched output drives an external P-
channel load switch to remove power when an over-
voltage condition is detected. The latch is reset when a
logic low is input to ON or the power supply is cycled.
The MAX1807 provides a 28V open-drain fault output
that can be used to trigger an alert, trip a resetable
fuse, or for other purposes. The MAX1808 includes a
low-battery comparator with hysteresis to drive the DP
output high, turning off the external P-channel switch
when the input voltage is too low.
The MAX1807/MAX1808 are available in a miniature 10-
pin 碌MAX package.
Features
o
Five 3% Accurate Overvoltage Comparators
o
Series PFET Gate Driver with VGS Limiter
o
21碌A(chǔ) Quiescent Supply Current
o
4碌A(chǔ) Shutdown Current
o
4.4V to 28V Operating Voltage Range
o
3% Accurate Comparator with 10% Hysteresis for
Low-Battery Detection (MAX1808)
o
28V Open-Drain N-Channel Output (MAX1807)
o
Small 10-Pin 碌MAX Package
MAX1807/MAX1808
________________________Applications
Notebook Computers
Power-Supply Modules
Multi-Output Power Supplies
PART
MAX1807EUB
MAX1808EUB
Ordering Information
TEMP. RANGE
-40擄C to +85擄C
-40擄C to +85擄C
PIN-PACKAGE
10 碌MAX
10 碌MAX
Pin Configuration and Typical Operating Circuit appear at
end of data sheet.
Functional Diagram
V
DD
ON
1V REF
TH
(MAX1808)
+
_
-
+
_
+
_
+
_
+
_
+
_
2.5V
INTERNAL
SUPPLY REF OK
POWER-ON
RESET
(60碌s)
PMOS
POWER
DRIVER
DP
IN1
IN2
IN3
IN4
IN5
R
S
Q
FAULT
(MAX1807)
MAX1807
MAX1808
GND
________________________________________________________________
Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim鈥檚 website at www.maxim-ic.com.

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