LTC4284 Series

High Power Negative Voltage Hot Swap Controller with Energy Monitor

Catalog

High Power Negative Voltage Hot Swap Controller with Energy Monitor

Part	Current - Supply	Supplier Device Package	Package / Case	Operating Temperature [Max]	Operating Temperature [Min]	Applications	Mounting Type	Features	Number of Channels	Voltage - Supply [Max]	Voltage - Supply [Min]	Programmable Features	Type
Analog Devices LTC4284HUHG#PBF	2.5 mA	44-QFN (5x8)	44-WFQFN Exposed Pad	125 °C	-40 °C	Telecom	Surface Mount	I2C OVP UVLO	1	12 V	10.8 VDC	Auto Retry Current Limit Fault Timeout Latched Fault OVP UVLO	Hot Swap Controller Monitor
Analog Devices LTC4284CUHG#TRPBF	2.5 mA	44-QFN (5x8)	44-WFQFN Exposed Pad	70 °C	0 °C	Telecom	Surface Mount	I2C OVP UVLO	1	12 V	10.8 VDC	Auto Retry Current Limit Fault Timeout Latched Fault OVP UVLO	Hot Swap Controller Monitor
Analog Devices LTC4284IUHG#TRPBF	2.5 mA	44-QFN (5x8)	44-WFQFN Exposed Pad	85 °C	-40 °C	Telecom	Surface Mount	I2C OVP UVLO	1	12 V	10.8 VDC	Auto Retry Current Limit Fault Timeout Latched Fault OVP UVLO	Hot Swap Controller Monitor
Analog Devices LTC4284IUHG#PBF	2.5 mA	44-QFN (5x8)	44-WFQFN Exposed Pad	85 °C	-40 °C	Telecom	Surface Mount	I2C OVP UVLO	1	12 V	10.8 VDC	Auto Retry Current Limit Fault Timeout Latched Fault OVP UVLO	Hot Swap Controller Monitor
Analog Devices LTC4284HUHG#TRPBF	2.5 mA	44-QFN (5x8)	44-WFQFN Exposed Pad	125 °C	-40 °C	Telecom	Surface Mount	I2C OVP UVLO	1	12 V	10.8 VDC	Auto Retry Current Limit Fault Timeout Latched Fault OVP UVLO	Hot Swap Controller Monitor

Catalog

High Power Negative Voltage Hot Swap Controller with Energy Monitor

Key Features

• Drives Two Gates for High Power Applications

• Configurable Parallel, Staged Start or Single Modes

• Protects MOSFET with SOA Timer

• Programmable 15mV to 30mV Current Limit Sense Voltage with <3.3% Accuracy and Adjustable Foldback

• 8-Bit to 16-Bit Gear-Shift ADC with 0.7% Accuracy

• Monitors Voltages, Currents, Power and Energy

• Nonvolatile Configuration and Fault Recording

• Floating Topology for Rugged High Voltage Operation

• Selectable Inrush Control: dV/dt or Current Limit

• I2C/SMBus or Single-Wire Broadcast Interfaces

• Min/Max ADC Measurement Logging with Alerts

• Reboots on I2C Command with Programmable Delay

• Adjustable Input UV/OV Thresholds and Hysteresis

• 44-Pin 5mm × 8mm QFN Package

Description

The LTC4284 negative voltage hot swap controller drives external N-channel MOSFETs to allow a board to be safely inserted and removed from a live backplane. The dual-gate, multi-mode drivers optimize the MOSFET safe operating area (SOA) for a variety of power levels. The SOA timer limits MOSFET temperature rise for reliable protection against overstresses.An I2C interface and onboard gear-shift ADC allow monitoring of board current, voltage, power, energy, and fault status. An available single-wire broadcast mode simplifies the interface by eliminating two isolators. The included EEPROM provides black-box capturing and nonvolatile configuration of fault behavior.Additional features respond to input UV/OV, interrupt the host when a fault has occurred, notify when output power is good, detect insertion of a board, turn off the MOSFETs if an external supply monitor fails to indicate power good within a timeout period, and auto-reboot after a programmable delay following a host commanded turn-off.APPLICATIONSTelecom Infrastructure–48V Distributed Power SystemsServers and Data CentersPower Monitors