MAX5913A

Obsolete

+48V Quad Hot-Swap Controllers For Power-Over-LAN

Highly Integrated Board Solution Reduces Board Space, Cost, and System Design Time

Data Sheet (Rev. 1) Product Selection Table

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Overview

Wide Operating Input Voltage Range: +35V to +72V
IEEE® 802.3af Compatible
Four Independent Power Switch Controllers
Open-Circuit Detector
On-Board Charge Pumps to Drive External n-Channel FETs
Current Sense with External Resistor
Foldback Current Limiting
+32V Input Undervoltage Lockout
On-Chip +12V, 100mA Voltage Relay Drivers

The MAX5913A/MAX5914A are quadruple hot-swap controllers. The MAX5913A/MAX5914A independently control four external n-channel switches to hot-swap system loads from a single V_CC supply line. The devices allow the safe insertion and removal of power devices from live network ports. The operating supply voltage range is between +35V and +72V. The devices are intended for applications in Power-Over-Media-Dependent Interface (MDI), but are not limited to such usage.

The MAX5913A/MAX5914A feature an internal undervoltage lockout (UVLO) function that prevents the FET from turning on, if V_CC does not exceed the default value of +32V. The devices also feature a +12V relay driver with 100mA current drive capable of driving low-voltage +3.3V relays. The MAX5913A features an active-low relay driver that sinks current when the relay output is enabled. The MAX5914A features an active-high relay driver output that sources 1mA to drive an external FET relay driver when the relay output is enabled. Control circuitry ensures the relays and the FETs are off until V_CC reaches the UVLO threshold. The MAX5913A/MAX5914A use an external sense resistor to enable all the internal current-sense functions.

The MAX5913A/MAX5914A feature a programmable analog current-limit circuit. If the switch remains in current limit for more than a programmable time, the n-channel FET latches off and the supply can be restarted either by autoretry or by an external command after the preset off-time has elapsed.

The MAX5913A/MAX5914A are available in a 44-pin MQFP package and are specified for the extended -40°C to +85°C operating temperature range.

Applications