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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