MAX5917

Provides Safe Hot Swap for +10V to +65V Power Supplies
IEEE 802.3af Compliant (MAX5917A)
Startup into 500F Load (MAX5917A)
280mA Current Limit for MAX5910
567mA Current Limit for MAX5917A
420mA Current Limit for MAX5917B
Zero-Current Load Detection
Integrated 2.2 Power FET
Status Output Reports Fault Conditions
Internal Switch-Protection Circuitry
Built-In Thermal Shutdown

IP Phones Power-Over-LAN Power-Over-MDI Remote Power Distribution Network Routers Network Switches Internet Appliances

VIN, VOUT to GND..................................................................-0.3V to +70.0V
ENABLE to GND......................................................................-0.3V to +12.0V
PGOOD, IFAULT to GND .........................................................-0.3V to +12.0V
UVLO to GND .................................................................-0.3V to (VIN + 0.3V)
PGOOD, IFAULT Sink Current ................................................................10mA
Continuous Power Dissipation (TA = +70°C)
8-Pin SO (derate 5.9mW/°C above +70°C).....................................470mW
16-Pin SO (derate 12.9mW/°C above +70°C)...............................1039mW
Operating Temperature Range ..........................................-40°C to +85°C
Maximum Junction Temperature ......................................................+150°C
Storage Temperature Range ...........................................-60°C to +150°C
Lead Temperature (soldering 10s) ..................................................+300°C

The MAX5910/MAX5917 are fully integrated hot-swap switches for positive supply rails. These devices allow the safe insertion and removal of circuit cards into live backplanes or ports without causing glitches on the backplane power-supply rail. They also monitor various circuit parameters and disconnect the load if a fault condition occurs, alerting the host with a logic-level IFAULT output. The MAX5910/MAX5917 operate over a +10V to +65V input voltage range. They are designed to permit hot plugging of an internet appliance such as an IP phone but are not limited to that application.

During startup, an internal power FET regulates the current between the backplane power source and the load to 280mA for the MAX5910, 567mA for the MAX5917A, and 420mA for the MAX5917B. After startup, the FET is fully enhanced to reduce its on-resistance. To ensure robust operation, the MAX5910/MAX5917 contain builtin safety features that prevent damage to the internal FET. They include an enable input, which responds to positive logic signals (+3.3V or +5V), allowing the host system to disconnect the load.

The MAX5910/MAX5917 Simple Swapper™ hot-swap ICs monitor four parameters for fault conditions: undervoltage lockout (UVLO), power-not-good, zero-current detection, and thermal shutdown. These devices are available in the extended temperature range, -40°C to +85°C. The MAX5910 comes in an 8-pin SO package and the MAX5917A/B is available in a 16-pin SO package.