HV300
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Engineering Specification
HV300 Negative Supply Hot Swap Controller
(Active High PWRGD)
Ordering Information
V
EE
Min
-90V
Max
-10V
8 Pin
Plastic DIP
HV300P
Package Options
8 Pin
SOIC
HV300LG
Dice
HV300X
Features
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-10V to -90V Input Voltage Range
0.55mA Typical Operating Supply Current
0.33mA Standby Mode Operating Supply Current
Programmable Input Under Voltage Limit with Hysteresis
Programmable Input Over Voltage Limit with Hysteresis
Programmable Current Limit
Programmable Start Delay, Ramp to Current Limit and PWRGD
PWRGD Status Output for Controlling Loads
Well Defined Gate Regulation Over Input Voltage Range
True Current Loop Control
Few External Components
General Description
The Supertex HV300, an 8-pin negative supply Hot Swap Controller
for live backplane systems, is designed to facilitate the safe insertion
or removal of circuit cards.
After an initial delay, the inrush current is limited by means of
controlling the gate of an external N-channel MOSFET that will ramp
up the current to a maximum value programmed by an external
resistor. The current ramp rate and initial time delay are
programmable by means of an external capacitor connected to the
RAMP pin. When the load capacitor reaches full charge and the
controller emerges from current limit mode an additional time delay
occurs. Thereafter the external N-channel MOSFET is switched to
full on, the open drain PWRGD output pull down is released and the
controller transitions to a low power standby mode.
Other features include programmable over voltage and under voltage
detection of the input voltage and an internal voltage regulator to
create a well-regulated gate drive voltage. The unique control loop
scheme provides full current control and limiting during start up.
Applications
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Central Office Switching
POTS Line Cards
ISDN Line Cards
xDSL Line Cards
PBX Systems
Powered Ethernet for VoIP
Distributed Power Systems
Negative Power Supply Control
Antenna and Fixed Wireless Systems
Absolute Maximum Ratings
V
EE
reference to V
DD
pin
V
PWRGD
referenced to V
EE
Voltage
Operating Ambient Temperature Range
Operating Junction Temperature Range
Storage Temperature Range
+0.5V to -100V
-0.5V to +100V
-40°C to +85°C
-40°C to +125°C
-65°C to +150°C
Functional Block Diagram
VDD
Internal
Supply
Regulator
UVLO
and
POR
Band Gap
Reference
Vref
Vdd
UV
PWRGD
Vref
LOGIC
OV
Vdd
Vref
Switch
Vref
VEE
SENSE
RAMP
GATE
Prepared by the Telecom Group
1 of 5
Rev. E
7/19/2001
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Supertex, Inc.
1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
SUPERTEX [ Supertex, Inc ]
