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ADM1070ART
-48 V Hot Swap Controller
REV.0
–48 V Hot Swap Controller
FUNCTIONAL BLOCK DIAGRAM
FEATURES
Allows Safe Board Insertion and Removal from a Live
–48 V Backplane
Typically Operates from –36 V to –80 V
Tolerates Transients up to –200 V (Limited by External
Components)
Accurate Programmable Linear Current Limit for
In-Rush Control and Short Circuit Protection
Programmable Timeout in Current Limit
Limited Consecutive Retry:
Auto-Restart after Current Limit Timeout
Shutdown after Seven Consecutive Auto Restarts
Provides Immunity from Step Induced Current Spikes
Default Timing Provided with no TIMER Capacitor
Single Pin Undervoltage/Overvoltage Detection
Programmable Operating Voltage Window
Programmable Undervoltage/Overvoltage Time Filter
Small 6-Lead SOT-23 Package
APPLICATIONS
Central Office Switching
–48 V Distributed Power Systems
Negative Power Supply Control
Hot Board Insertion
Electronic Circuit Breaker
High Availability Servers
Programmable Current Limiting Circuit
–48 V Power Supply Modules
GENERAL DESCRIPTIONThe ADM1070 is a negative voltage hot swap controller that
allows a board to be safely inserted and removed from a live
–48 V backplane. The part achieves this by providing robust
current limiting, protection against transient and nontransient
short circuits and overvoltage and undervoltage conditions. The
ADM1070 typically operates from a negative voltage of up to
–80 V and can tolerate transient voltages of up to –200 V.
In-rush current is limited to a programmable value by control-
ling the gate drive of an external N-channel FET. The current
limit can be controlled by the choice of the sense resistor,
RSENSE. Added control of the in-rush current is provided by an
on-chip timer that uses pulsewidth modulation to allow the
maximum current to flow for only 3% of the time. An autorestart
occurs after a current limit timeout. After seven successive
autorestarts, the fault will be latched and the part goes into
shutdown with the result that the external FET is disabled until
the power is reset.
The ADM1070 also features single-pin undervoltage and over-
voltage detection. The FET is turned off if a nontransient
voltage less than the undervoltage threshold, typically –36 V, or
greater than the overvoltage threshold, typically –77 V, is detected
on the UV/OV Pin. The operating voltage window of the
ADM1070 is programmable and is determined by the ratio R1/R2.
Time filtering on the undervoltage and overvoltage detection
and current limiting is programmable via the TIMER Pin. An
external capacitor connected between the TIMER Pin and VEE
determines the undervoltage/overvoltage time filter and the
timeout in current limit. If the pin is tied to VEE, the time filter
values and the current limit timeout revert to default figures.
The ADM1070 is fabricated using BiCMOS technology for mini-
mal power consumption. The part is available in a small
6-Lead SOT-23 package.
ADM1070–SPECIFICATIONSGATE PIN––FET DRIVER
(VDD = 0 V, VEE = –48 V, RDROP = 16 k�, TA = –40�C to +85�C, unless other-
wise noted.)
ADM1070TIMER PIN––TIMING CONTROL
*Not production tested. Guaranteed by design.
Specifications subject to change without notice.
ABSOLUTE MAXIMUM RATINGS*(All voltages referred to VEE, unless otherwise noted. TA = 25°C, unless other-
wise noted.)
Supply Voltage (VDD–VEE) . . . . . . . . . . . . . –0.3 V to –200.0 V
Maximum Shunt Supply Voltage, VSS . . . . . . . . . . . . . . .16 V
SENSE Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . . –2 V to +16 V
GATE Pin . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +16 V
UV/OV Pin . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +15 V
TIMER Pin . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3 V to +10 V
Maximum Junction Temperature . . . . . . . . . . . . . . . . . 125°C
Temperature Range . . . . . . . . . . . . . . . . . . . . –40°C to +85°C
Continuous Power Dissipation . . . . . . . . . . . . . . . . . 282 mW
Storage Temperature Range . . . . . . . . . . . –65°C to +150°C
Lead Temperature (Soldering, 10 sec) . . . . . . . . . . . . . 300°C
*This is a stress rating only and functional operation of the device at these or any
other conditions above those indicated in the operation sections of this specifica-
tion is not implied. Exposure to absolute maximum rating conditions for extended
periods of time may affect reliability.
THERMAL CHARACTERISTICS6-Lead SOT-23 Package:
�JA = 226.6°C/W, �JC = 91.99°C/W
CAUTIONESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000V readily
accumulate on the human body and test equipment and can discharge without detection. Although the
ADM1070 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended
to avoid performance degradation or loss of functionality.
ORDERING GUIDE
ADM1070
PIN CONFIGURATION
PIN FUNCTION DESCRIPTION3VIN
4TIMER
TPC 1.IIN vs. Temperature
TPC 2.IIN vs. VIN
TPC 3.RZ vs. Temperature
TPC 4.VZ vs. Temperature
TPC 5.Undervoltage Lockout, VLKO vs. Temperature
TPC 6.Circuit Breaker Current Limit Voltage,
VCB vs. Temperature
ADM1070TPC 7.Analog Current Limit Voltage, VACL vs.
Temperature
TPC 8.Fast Current Limit Voltage, VFCL vs. Temperature
TPC 9.IGATE (Source) vs. Temperature
TPC 10.IGATE (FCL, Sink) vs. Temperature (VGATE = 9 V)
TPC 11.VGATE vs. Temperature
TPC 12.VGATEL vs. Temperature
TPC 13.IGATE vs. VGATE
TPC 14.High and Low Timer Thresholds vs. Temperature
TPC 15.UV Threshold vs. Temperature
TPC 16.OV Threshold vs. Temperature
TPC 17.ISENSE vs. Temperature (VSENSE = 50 mV)
TPC 18.ISENSE vs. (VSENSE – VEE)
ADM1070TPC 19.POR Delay vs. Temperature
TPC 20.Voltage Fault Filter Time vs. Temperature
TPC 21.Maximum Current Limit On Time vs.
Temperature
TPC 23.Current Limit PWM vs. Temperature
TPC 22.Continuous Short Circuit Time before Shutdown
vs. Temperature
