MAX1807 Datasheet, PDF (1/10 Pages) Maxim Integrated Products – Micropower Adjustable Overvoltage Protection Controllers

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 µMAX package.
Features
o Five 3% Accurate Overvoltage Comparators
o Series PFET Gate Driver with VGS Limiter
o 21µA Quiescent Supply Current
o 4µA 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 µMAX Package
________________________Applications
Notebook Computers
Power-Supply Modules
Multi-Output Power Supplies
PART
MAX1807EUB
MAX1808EUB
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
10 µMAX
10 µMAX
Pin Configuration and Typical Operating Circuit appear at
end of data sheet.
Functional Diagram
ON
TH
(MAX1808)
IN1
IN2
IN3
IN4
IN5
2.5V
INTERNAL
1V REF SUPPLY REF OK
+
_
+
_-
+
_
+
_
+
_
+
_
POWER-ON
RESET
(60µs)
RQ
S
MAX1807
MAX1808
V_DD
PMOS
POWER
DP
DRIVER
FAULT
(MAX1807)
GND
________________________________________________________________ Maxim Integrated Products 1
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