General Description
The Supertex HV300 (and HV310), Hotswap Controller, Negative Supply control power supply connection during insertion of cards or modules into live backplanes. They may be used in traditional ‘negative 48V’ powered systems or for higher voltage busses up to negative 90V.
Operation during the initial power up prevents turn-on glitches, and after complete charging of load capacitors (typically found in filters at the input of DC-DC converters) the HV300 (and HV310) issues a power good signal. This signal is typically used to enable the DC-DC converter.

FEATUREs
❏ HV300, PWRGD=Active HIGH
❏ HV310, PWRGD=Active LOW
❏ -10V to -90V Input Voltage Range
❏ Few External Components
❏ 0.33mA Typical Standby Supply Current
❏ Programmable Over/Under Voltage Limits with Hysteresis
❏ Programmable Current Limit
❏ Active control during all phases of start-up
❏ Programmable timing
❏ 8 Lead SOIC

APPLICATIONs
❏ Central Office Switching
❏ Servers
❏ 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