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General Description

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 cur-

rent 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 built-

in 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.

Applications

IP Phones

Power-Over-LAN

Power-Over-MDI

Remote Power Distribution

Network Routers

Network Switches

Internet Appliances

Features

♦ Provides Safe Hot Swap for +10V to +65V Power

Supplies

♦ IEEE 802.3af Compliant (MAX5917A)

♦ Startup into 500µF Load (MAX5917A)

♦ 280mA Current Limit for MAX5910

♦ 567mA Current Limit for MAX5917A

♦ 420mA Current Limit for MAX5917B

♦ Zero-Current Load Detection

♦ Integrated 2.2Ω Power FET

♦ Status Output Reports Fault Conditions

♦ Internal Switch-Protection Circuitry

♦ Built-In Thermal Shutdown

MAX5910/MAX5917

+65V Simple Swapper Hot-Swap Switches

________________________________________________________________ Maxim Integrated Products 1

+3.3V

IFAULT

(+42V)

ENABLE

GND

OUT

PGOOD

UVLO

10kΩ

MAX5910

MAX5917

OFF

Typical Operating Circuit

Ordering Information

19-1706; Rev 0; 7/01

*Future product—contact factory for availability.

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

PART TEMP. RANGE PIN-PACKAGE

MAX5910ESA -40°C to +85°C8 SO

MAX5917AESE* -40°C to +85°C 16 SO

MAX5917BESE -40°C to +85°C 16 SO

Simple Swapper is a trademark of Maxim Integrated Products, Inc.

Pin Configurations appear at end of data sheet.

Summary of content (11 pages)

PAGE 1
9-1706; Rev 0; 7/01 +65V Simple Swapper Hot-Swap Switches 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.
PAGE 2
MAX5910/MAX5917 +65V Simple Swapper Hot-Swap Switches ABSOLUTE MAXIMUM RATINGS 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 ............................................
PAGE 3
+65V Simple Swapper Hot-Swap Switches (VIN = +42V, GND = 0, UVLO = open circuit, VENABLE = +3.3V, and TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.
PAGE 4
Typical Operating Characteristics (VIN = +42V, GND = 0, UVLO = open circuit, VENABLE = 3.3V, RL = 1.8kΩ, TA = +25°C, unless otherwise noted). SUPPLY CURRENT vs. TEMPERATURE 0.8 0.4 2.6 ON-RESISTANCE (Ω) 1.2 3.0 MAX5910 toc02 1.6 SUPPLY CURRENT (mA) 1.6 ON-RESISTANCE vs. TEMPERATURE 2.0 MAX5910 toc01 2.0 1.2 0.8 0.4 ILOAD = 150mA 0 30 40 50 60 1.
PAGE 5
+65V Simple Swapper Hot-Swap Switches MAX5910 TURN-OFF WAVEFORMS (RL = 1.8kΩ, CL = 47µF) MAX5910 OVER-CURRENT RESPONSE MAX5910 ZERO-CURRENT RESPONSE MAX5910 toc07 MAX5910 toc09 MAX5910 toc08 A A 0 A 0 0 B B 0 B C 0 0 C 0 0 C 0 20ms/div 40ms/div 2ms/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div A: IOUT, 200mA/div B: IFAULT, 5V/div C: VOUT, 20V/div (SHORTED TO GND) A: IOUT, 100mA/div B: IFAULT, 5V/div C: VOUT, 20V/div MAX5917B TURN-ON WAVEFORMS (RL = 1.
PAGE 6
Typical Operating Characteristics (continued) (VIN = +42V, GND = 0, UVLO = open circuit, VENABLE = 3.3V, RL = 1.8kΩ, TA = +25°C, unless otherwise noted). MAX5917B TURN-OFF WAVEFORMS (RL = 1.
PAGE 7
+65V Simple Swapper Hot-Swap Switches 590 300 250 370 IOUT (mA) IOUT (mA) 390 570 560 -15 10 35 60 150 100 540 50 0 -40 85 -15 10 35 60 0 85 0.4 1.6 2.0 600 MAX5910 toc23 400 1.2 MAX5917A IOUT vs. (VIN - VOUT) MAX5917B IOUT vs. (VIN - VOUT) 500 0.8 VIN - VOUT (V) TEMPERATURE (°C) TEMPERATURE (°C) MAX5910 toc22 500 400 300 IOUT (mA) -40 200 550 530 350 IOUT (mA) IOUT (mA) 580 410 MAX5910 toc21 350 MAX5910 toc20 600 MAX5910 toc19 430 MAX5910 IOUT vs.
PAGE 8
MAX5910/MAX5917 +65V Simple Swapper Hot-Swap Switches Pin Description PIN MAX5910 MAX5917A/B NAME FUNCTION 1 2 UVLO Undervoltage Lockout Input. Leave UVLO open circuit for the default setting of 26.5V. Alternatively, UVLO can be connected to a resistivedivider to set a desired lockout voltage. See the Changing the Undervoltage Lockout Setting section. 2 3 VIN Voltage Input Terminal. Bypass VIN to GND with a 0.1µF capacitor to improve noise immunity. 3 1, 6, 8, 9, 15, 16 N.C. No Connection.
PAGE 9
+65V Simple Swapper Hot-Swap Switches VIN Power-good (PGOOD) logic output signals when the output has exceeded the PGOOD threshold. When the output voltage is below 70% of the input voltage, PGOOD is pulled low. When the output voltage is larger than 80% of the input voltage for more than 12ms, PGOOD is asserted. Applications Information VOUT VIN Power-Good (PGOOD) MAX5910/MAX5917 Thermal Shutdown Fault The MAX5910/MAX5917 monitor their internal die temperature.
PAGE 10
+65V Simple Swapper Hot-Swap Switches MAX5910/MAX5917 Functional Diagram VIN + 8V CHARGE PUMP RSENSE IN OUT OSC. IREG RPG1 VREF ON/OFF BANDGAP REFERENCE PG RUV1 RPG2 THERMAL SHUTDOWN 1.236V αVIN GND UVLO RUV2 IFAULT CONTROL LOGIC GND PGOOD RUV3 GND UVLO ENABLE Pin Configurations TOP VIEW UVLO 1 VIN 2 N.C. 8 VOUT 7 GND MAX5910 3 6 IFAULT ENABLE 4 5 PGOOD N.C. 1 16 N.C. UVLO 2 15 N.C. VIN 3 14 VOUT GND 4 8 SO MAX5917A/B 13 GND GND 5 12 GND N.C.
PAGE 11
+65V Simple Swapper Hot-Swap Switches SOICN.EPS Package Information Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.