ADM1270:High Voltage Input Protection Device0 pages
Preliminary Technical Data
High Voltage Input Protection Device
ADM1270
FEATURES
Controls supply voltages from 4 V to 60 V
Gate drive for low voltage drop reverse supply protection
Gate drive for P-channel FETs
In-rush current limiting control
Adjustable current limit
Foldback current limiting
Automatic retry or latch-off on current fault
Programmable current-limit timer for SOA
Power-good and Fault outputs
Analog UV and OV protection
16-lead 3x3mm LFCSP package
16-lead QSOP package
APPLICATIONS
FUNCTIONAL BLOCK DIAGRAM
VCC/SENSE+
LDO
VCAP
IOUT
UV
1V
Gate Drive/Logic
1V
ISET
Ref
Select
FLB
Current Limit
FB_PG
Current
Limit
Control
TIMER_OFF
Timer On
Timer
GENERAL DESCRIPTION
The ADM1270 is designed to control the in-rush current
during powering on of a system via an external P-channel FET.
GATE
OV
Industrial Modules
Battery Powered/Portable Instrumentation
The ADM1270 is a current limiting controller that is intended to
provide inrush current limiting and overcurrent protection for
modular or battery powered systems. When circuit boards are
inserted into a live backplane, discharged supply bypass
capacitors draw large transient currents from the backplane
power bus as they charge. These transient currents can cause
permanent damage to connector pins, as well as dips on the
backplane supply that can reset other boards in the system.
SENSE-
RPFG
Timeout
EN
TIMER
VCB
GROUND
FAULT
PWRGD
Figure 1.
To protect the system from a reverse polarity input supply, there
is a provision made to control an additional external P-channel
FET. This feature is used to prevent reverse current flow that
could damage the load or the ADM1270.
The ADM1270 is available in a 3x3 16-lead LFCSP and a 16-lead
QSOP package.
Rev. PrE
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