MAX5913A, MAX5914A +48V Quad Hot-Swap Controllers For Power-Over-LAN
20Pages

General Description 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 VCC 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 VCC does not exceed the default value of +32V. The devices also feature a +12V relay driver with 100mA current drive capable of driving lowvoltage +3.3V relays. The MAX5913A features an active-low relay driver that sinks current when the relay output is enabled. The MAX5914A features an activehigh 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 VCC 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 offtime 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 Power-Over-LAN Power-Over-MDI IP Phone Switches/Routers Telecom Line Cards Network Switches/Routers Midspan Power-Over-MDI Features 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 MAX5913A/MAX5914A +48V Quad Hot-Swap Controllers For Power-Over-LAN ________________________________________________________________ Maxim Integrated Products 1 RTRYEN STATOUT OCEN DGND VCC CSP1 DRAIN1 GATE1 OUT1 CSP2 DRAIN2 FAULT STAT1 STAT2 STAT3 STAT4 CSP4 DRAIN4 OUT4 GATE4 CSP3 DRAIN3 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 44 43 42 41 40 39 38 37 36 35 34 33 32 31 30 29 28 27 26 25 24 23 OUT3 GATE3 VRLY RLYD3 RLYD4 DGND RLYD1 RLYD2 AGND OUT2 GATE2 VDD RTIM ON4 RLYON4 ON3 RLYON3 ON2 RLYON2 ON1 RLYON1 DC MQFP TOP VIEW + MAX5913A MAX5914A Pin Configuration Ordering Information 19-3302; Rev 1; 1/11 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. PART TEMP RANGE PIN-PACKAGE MAX5913AEMH+ -40°C to +85°C 44 MQFP MAX5913AEMH+T -40°C to +85°C 44 MQFP MAX5914AEMH+ -40°C to +85°C 44 MQFP MAX5914AEMH+T -40°C to +85°C 44 MQFP Typical Operating Circuit appears at end of data sheet. +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. IEEE is a registered service mark of the Institute of Electrical and Electronics Engineers, Inc.

MAX5913A/MAX5914A +48V Quad Hot-Swap Controllers For Power-Over-LAN _______________________________________________________________________________________ 3 ELECTRICAL CHARACTERISTICS (continued) (VCC = VCSP_ = +48V, VAGND = VDGND = 0V, VDD = +3.3V, VRLY = +12V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VCC = VCSP_ = +48V and TA = +25°C.) Note 1: See Typical Operating Characteristics for Current-Limit Foldback, and refer to Current Sensing and Regulation section. Note 2: The resistor at RTIM can range from 2kÙ to 40kÙ. Note 3: Limits are 100% tested at TA = +25°C...

MAX5913A/MAX5914A +48V Quad Hot-Swap Controllers For Power-Over-LAN 4 _______________________________________________________________________________________ Typical Operating Characteristics (VCSP_ = VCC = +48V, VDD = +3.3V, VRLY = +12V, VAGND = VDGND = 0V, RTIM = open, TA = +25°C, unless otherwise specified.) 2.0 2.4 3.2 2.8 3.6 4.0 33 36 39 42 45 48 51 54 57 60 63 66 69 72 SUPPLY CURRENT vs. INPUT VOLTAGE MAX5913A/14A toc01 INPUT VOLTAGE (V) SUPPLY CURRENT (mA) TA = +85°C TA = +25°C TA = -40°C 3.8 3.4 3.0 2.6 2.2 3.5 3.4 3.3 3.2 3.1 3.0 2.9 2.8 2.7 2.6 2.5 -40 -15 10 35 60 85 SUPPLY...

MAX5913A/MAX5914A +48V Quad Hot-Swap Controllers For Power-Over-LAN _______________________________________________________________________________________ 5 TURN-ON INTO CAPACITIVE LOAD (CL = 0.47ìF) MAX5913A/14A toc10 0 A B 0 C 0 0 D 400ìs/div RLYON = VDD A: VON, 5V/div B: VGATE, 20V/div C: VOUT, 20V/div D: IOUT, 100mA/div TURN-ON INTO CAPACITIVE LOAD (CL = 47ìF) MAX5913A/14A toc11 0 A B 0 C 0 0 D 1ms/div RLYON = VDD, RRTIM = 2kÙ A: VON, 5V/div B: VGATE, 20V/div C: VOUT, 20V/div D: IOUT, 200mA/div TURN-ON INTO CAPACITIVE LOAD (CL = 470ìF) MAX5913A/14A toc12 0 A B 0 C 0 0 D 10ms/div RLYON...

MAX5913A/MAX5914A +48V Quad Hot-Swap Controllers For Power-Over-LAN 6 _______________________________________________________________________________________ Typical Operating Characteristics (continued) (VCSP_ = VCC = +48V, VDD = +3.3V, VRLY = +12V, VAGND = VDGND = 0V, RTIM = open, TA = +25°C, unless otherwise specified.) CURRENT-LIMIT FOLDBACK (VCC = +72V) MAX5913A/14A toc16 0 A B 0 C 0 10ms/div RLYON = VDD, RL = 200Ù, RRTIM = 40kÙ A: VON, 5V/div B: VOUT, 10V/div C: IOUT, 200mA/div CURRENT-LIMIT FOLDBACK (VCC = +57V) MAX5913A/14A toc17 0 0 AB 0 C 10ms/div RLYON = VDD, RL = OPEN, RRTIM =...

MAX5913A/MAX5914A +48V Quad Hot-Swap Controllers For Power-Over-LAN _______________________________________________________________________________________ 7 Typical Operating Characteristics (continued) (VCSP_ = VCC = +48V, VDD = +3.3V, VRLY = +12V, VAGND = VDGND = 0V, RTIM = open, TA = +25°C, unless otherwise specified.) SHORT-CIRCUIT RESPONSE (VCC = +48V EXPANDED TIME SCALE) MAX5913A/14A toc22 0 A 0 B 40ìs/div ON = RLYON = VDD, RL = 1Ù, RRTIM = 2kÙ A: IOUT, 200mA/div B: VGATE, 20V/div PEAK SHORT-CIRCUIT RESPONSE (VCC = +48V EXPANDED TIME SCALE) MAX5913A/14A toc23 0 A B 0 1ìs/div ON =...