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19-1706; Rev 0; 7/01
+65V Simple Swapper Hot-Swap Switches
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 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 SwapperTM 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, -40C to +85C. The MAX5910 comes in an 8-pin SO package and the MAX5917A/B is available in a 16-pin SO package.
Features
o Provides Safe Hot Swap for +10V to +65V Power Supplies o IEEE 802.3af Compliant (MAX5917A) o Startup into 500F Load (MAX5917A) o 280mA Current Limit for MAX5910 o 567mA Current Limit for MAX5917A o 420mA Current Limit for MAX5917B o Zero-Current Load Detection o Integrated 2.2 Power FET o Status Output Reports Fault Conditions o Internal Switch-Protection Circuitry o Built-In Thermal Shutdown
MAX5910/MAX5917
Ordering Information
PART MAX5910ESA MAX5917AESE* MAX5917BESE TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C PIN-PACKAGE 8 SO 16 SO 16 SO
Applications
IP Phones Power-Over-LAN Power-Over-MDI Remote Power Distribution Network Routers Network Switches Internet Appliances
*Future product--contact factory for availability.
Typical Operating Circuit
VIN (+42V) VIN MAX5910 MAX5917 VOUT 10k IFAULT PGOOD ENABLE OFF GND L O A D +3.3V
UVLO ON
10k
Pin Configurations appear at end of data sheet. Simple Swapper is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ Maxim Integrated Products
1
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.
+65V Simple Swapper Hot-Swap Switches MAX5910/MAX5917
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 ............................................10mA Continuous Power Dissipation (TA = +70C) 8-Pin SO (derate 5.9mW/C above +70C)..................470mW 16-Pin SO (derate 12.9mW/C above +70C)............1039mW Operating Temperature Range ...........................-40C to +85C Maximum Junction Temperature .....................................+150C Storage Temperature Range .............................-60C to +150C Lead Temperature (soldering 10s) ..................................+300C
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(VIN = +42V, GND = 0, UVLO = open circuit, VENABLE = +3.3V, and TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER Input Voltage Range Supply Current Output Current Limit SYMBOL VIN IIN ILIM VIN = 10V to 65V (Note 1) MAX5910 VOUT = VIN - 5V, VIN = 10V to 65V MAX5917A MAX5917B MAX5910 Continuous Operating Output Current IOUT (Note 2) MAX5917A MAX5917B VIN = 10V to 65V, MAX5910, IOUT = 200mA MAX5917A, IOUT = 400mA MAX5917B, IOUT = 300mA 250 510 370 CONDITIONS MIN 10 1.2 280 567 420 TYP MAX 65 2.5 310 623 470 240 400 350 mA mA UNITS V mA
DMOS On-Resistance
RDS(ON)
2.2
4
ENABLE Voltage Logic Low ENABLE Voltage Logic High ENABLE High Input Current IFAULT Output Leakage Current PGOOD Output Leakage Current VIN to VOUT Leakage Current PGOOD/IFAULT Output Logic Low PGOOD Threshold PGOOD Hysteresis Zero-Current Detection Threshold
VLOW VHIGH IIH IOH ILPGOOD ILIN/OUT VOL VPG PGHYS IFTH VENABLE = +5V IFAULT = 10V, IOH > (IFTH + IFHYS) PGOOD = 10V, VOUT > VPG ENABLE = 0, VIN = +65V Sink current = 3mA Percentage of VIN, VOUT rising Percentage of VIN Decreasing output current MAX5910 MAX5917A MAX5917B 2 2 2 71 78 10 12 6 12 2.4
0.8 1 1 1 1 0.4 85 25 10 25
V V A A A A V % % mA
2
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+65V Simple Swapper Hot-Swap Switches
ELECTRICAL CHARACTERISTICS (continued)
(VIN = +42V, GND = 0, UVLO = open circuit, VENABLE = +3.3V, and TA = -40C to +85C, unless otherwise noted. Typical values are at TA = +25C.)
PARAMETER Zero-Current Detection Threshold Hysteresis IFAULT Output Delay PGOOD Output Delay Thermal Shutdown Temperature Thermal Shutdown Hysteresis Default Undervoltage Lockout Undervoltage Lockout Hysteresis Minimum Undervoltage Lockout Threshold Undervoltage Lockout Input Resistance SYMBOL IFHYS tIFD tPGD TJ TJHYS VUVLO UVLOHYS VUVLO
(MIN)
MAX5910/MAX5917
CONDITIONS Percentage of IFTH (Figure 1) (Figure 2) Die temperature increasing VIN decreasing Percentage of VUVLO UVLO connected to VIN, VIN decreasing Force I = 5A into UVLO pin
MIN
TYP 10
MAX
UNITS %
7 7
12 12 140 3.5
17 17
ms ms
o o
C C
24.5
26.5 11
28.5
V %
7 260
7.5
8
V k
RUVLO
Note 1: Measured at GND pin at the end of the output voltage slew. Note 2: Guaranteed by RDSON test. Limited by package power dissipation.
IOUT VPG IFTH tIFD IFAULT 3.3V VIN tPGD 3.3V
0
PGOOD
0
Figure 1. IFAULT Delay
Figure 2. Power-Good Delay
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+65V Simple Swapper Hot-Swap Switches MAX5910/MAX5917
Typical Operating Characteristics
(VIN = +42V, GND = 0, UVLO = open circuit, VENABLE = 3.3V, RL = 1.8k, TA = +25C, unless otherwise noted).
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX5910 toc01
SUPPLY CURRENT vs. TEMPERATURE
MAX5910 toc02
ON-RESISTANCE vs. TEMPERATURE
MAX5910 toc03
2.0
2.0
3.0
1.6 SUPPLY CURRENT (mA)
1.6 SUPPLY CURRENT (mA)
2.6 ON-RESISTANCE ()
1.2
1.2
2.2
0.8
0.8
1.8
0.4 NO LOAD 0 10 20 30 40 50 60 SUPPLY VOLTAGE (V)
0.4 NO LOAD 0 -40 -15 10 35 60 85 TEMPERATURE (C)
1.4 ILOAD = 150mA 1.0 -40 -15 10 35 60 85 TEMPERATURE (C)
MAX5910 TURN-ON WAVEFORMS (RL = 1.8k, CL = 0)
A 0
MAX5910 toc04
MAX5910 TURN-OFF WAVEFORMS (RL = 1.8k, CL = 0)
MAX5910 toc05
MAX5910 TURN-ON WAVEFORMS (RL = 1.8k, CL = 47F)
MAX5910 toc06
A 0
A 0 B
B B 0 0 C 0 0 C 0 C 0 2ms/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div
2ms/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div
2ms/div
4
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+65V Simple Swapper Hot-Swap Switches MAX5910/MAX5917
Typical Operating Characteristics (continued)
(VIN = +42V, GND = 0, UVLO = open circuit, VENABLE = 3.3V, RL = 1.8k, TA = +25C, unless otherwise noted).
MAX5910 TURN-OFF WAVEFORMS (RL = 1.8k, CL = 47F)
MAX5910 ZERO-CURRENT RESPONSE
MAX5910 toc08
MAX5910 OVER-CURRENT RESPONSE
MAX5910 toc09
MAX5910 toc07
A A 0 A 0 B B 0 C 0 C 0 0 B 0
0 20ms/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div A: IOUT, 100mA/div B: IFAULT, 5V/div C: VOUT, 20V/div 2ms/div
C 0 40ms/div A: IOUT, 200mA/div B: IFAULT, 5V/div C: VOUT, 20V/div (SHORTED TO GND)
MAX5917B TURN-ON WAVEFORMS (RL = 1.8k, CL = 0)
A 0
MAX5910 toc10
MAX5917B TURN-OFF WAVEFORMS (RL = 1.8k, CL = 0)
MAX5910 toc11
MAX5917B TURN-ON WAVEFORMS (RL = 1, CL = 47F)
A 0
MAX5910 toc12
A 0
B 0
B 0 C 0 2ms/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div
B 0 C 0
C 0
2ms/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div
2ms/div
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5
+65V Simple Swapper Hot-Swap Switches MAX5910/MAX5917
Typical Operating Characteristics (continued)
(VIN = +42V, GND = 0, UVLO = open circuit, VENABLE = 3.3V, RL = 1.8k, TA = +25C, unless otherwise noted).
MAX5917B TURN-OFF WAVEFORMS (RL = 1.8k, CL = 47F)
A 0
MAX5910 toc13
MAX5917B TURN-ON WAVEFORMS (RL = 300, CL = 500F)
MAX5917B TURN-OFF WAVEFORMS (RL = 300, CL = 500F)
MAX5910 toc14
MAX5910 toc15
A 0
A 0 B
B 0 C 0
B 0 0
C 0 20ms/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div
C 0 10ms/div A: ENABLE, 5V/div B: VOUT, 20V/div C: PGOOD, 5V/div 100ms/div
MAX5917B ZERO-CURRENT RESPONSE
MAX5910 toc16
MAX5917B OVER-CURRENT RESPONSE
MAX5910 toc17
MAX5910 IOUT vs. TEMPERATURE
MAX5910 toc18
A A 0 0 0 C IOUT (mA) 40ms/div A: IOUT, 200mA/div B: IFAULT, 5V/div C: VOUT, 20V/div (SHORTED TO GND) B B 0
300
290
280
270
0
C 0 2ms/div A: IOUT, 100mA/div B: IFAULT, 5V/div C: VOUT, 20V/div
260
250 -40 -15 10 35 60 85 TEMPERATURE (C)
6
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+65V Simple Swapper Hot-Swap Switches MAX5910/MAX5917
Typical Operating Characteristics (continued)
(VIN = +42V, GND = 0, UVLO = open circuit, VENABLE = 3.3V, RL = 1.8k, TA = +25C, unless otherwise noted).
MAX5917B IOUT vs. TEMPERATURE
MAX5910 toc19
MAX5917A IOUT vs. TEMPERATURE
MAX5910 toc20
MAX5910 IOUT vs. (VIN - VOUT)
MAX5910 toc21
450
600 590 580
350 300 250 IOUT (mA) 200 150 100 50 0
430
IOUT (mA)
410
IOUT (mA)
570 560 550
390
370
540 530 -40 -15 10 35 60 85 -40 -15 10 35 60 85 TEMPERATURE (C) TEMPERATURE (C)
350
0
0.4
0.8
1.2
1.6
2.0
VIN - VOUT (V)
MAX5917B IOUT vs. (VIN - VOUT)
MAX5910 toc22
MAX5917A IOUT vs. (VIN - VOUT)
MAX5910 toc23
500
600 500 400
400
IOUT (mA)
IOUT (mA)
300
300 200
200
100
100 0 0 0.4 0.8 1.2 1.6 2.0 0 0.4 0.8 1.2 1.6 2.0 VIN - VOUT (V) VIN - VOUT (V)
0
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7
+65V Simple Swapper Hot-Swap Switches MAX5910/MAX5917
Pin Description
PIN MAX5910 MAX5917A/B NAME FUNCTION 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. Voltage Input Terminal. Bypass VIN to GND with a 0.1F capacitor to improve noise immunity. No Connection. Not internally connected. 3.3V Logic Input (TTL compatible), Active-High. Turns the internal FET on or off. Drive ENABLE high to enable VOUT. Drive ENABLE low to disable VOUT. Open-Drain Logic Output, Active-High. PGOOD signals that the output is within specification. When the output is less than 70% of the input, the PGOOD signal is pulled low. Connect a 10k pullup resistor (R) to 3.3V. Open-Drain Logic Output, Active-Low. IFAULT is asserted when the output current falls below the IFTH nominal threshold or when the switch is off. Connect a 10k pullup resistor (R) to 3.3V. Ground Voltage Output Terminal
1
2
UVLO
2 3 4
3 1, 6, 8, 9, 15, 16 7
VIN N.C. ENABLE
5
10
PGOOD
6 7 8
11 4, 5, 12, 13 14
IFAULT GND VOUT
Detailed Description
The MAX5910/MAX5917 are fully integrated hot-swap switches for positive power-supply rails. The devices allow safe insertion and removal of circuit cards into live backplanes or ports without causing glitches on the backplane power-supply rail. During startup these devices act as current regulators using their on-board FET to limit the amount of current drawn by the load to 280mA for MAX5910, 567mA for MAX5917A, and 420mA for MAX5917B. If the required load current exceeds that current limit, the internal switch behaves like a constant current source. The MAX5910/MAX5917 monitor the input voltage, the output voltage, the output current, and the die temperature. They assert IFAULT and PGOOD accordingly if they detect an error condition. A zero-current load detection feature activates if the load current drops below IF TH for over 12ms. The MAX5910/MAX5917 also include an ENABLE input allowing the host system to turn the FET on or off.
Normal Operation
Startup
When power is first applied with ENABLE high, or when ENABLE is asserted, the MAX5910/MAX5917A/ MAX5917B limit the current to the load to 280mA/ 567mA/420mA. PGOOD is asserted high 12ms after the output voltage exceeds the power-good threshold. PGOOD is pulled low if VOUT is less than 70% VIN.
Zero-Current Load Fault
A zero-current load detection feature activates if the load current drops below IFTH for more than 12ms. The MAX5910/MAX5917 flag the zero-current condition but do not disconnect the load. IFAULT is deasserted whenever the load current exceeds the IFTH + IFHYS zero-current detection threshold. If VIN UVLO, where UVLO is the desired voltage at which the UVLO fault occurs, the internal FET is turned off and IFAULT and PGOOD are pulled low. The default UVLO voltage is 26.5V, but it can be adjusted using an external resistive-divider (see the Changing the Undervoltage Lockout Setting section).
Undervoltage Lockout Fault
8
_______________________________________________________________________________________
+65V Simple Swapper Hot-Swap Switches
Thermal Shutdown Fault
The MAX5910/MAX5917 monitor their internal die temperature. If the temperature of the die exceeds +140C, the internal FET is turned off and IFAULT and PGOOD are pulled low. The output is enabled again only when the die temperature is below the thermal shutdown temperature by 3.5C typically.
VOUT MAX5910 VOUT IFAULT PGOOD GND R R
MAX5910/MAX5917
VIN
VIN UVLO
Power-Good (PGOOD)
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.
ENABLE N.C.
+3.3V
Applications Information
Choosing a Device
The MAX5910 can output 280mA, the MAX5917B can output 420mA, and the MAX5917A can output up to 567mA. In applications where high power is expected, use the MAX5917 for its superior heat dissipation properties, and always solder all of its GND pins to a large section of circuit board copper.
Figure 3. UVLO is Set Internally to its +26.5V Default Value
VIN 0.1F
VIN UVLO
VOUT MAX5910 VOUT IFAULT PGOOD GND 10k 10k
Logic Control
The enable input (ENABLE) responds to 3.3V logic signals and will force the internal FET off if ENABLE is pulled low. This feature allows the host to disconnect the load from the power bus if required. Drive ENABLE high to enable VOUT.
ENABLE N.C.
+3.3V
Changing the Undervoltage Lockout Setting
The undervoltage lockout (UVLO) value defaults to 26.5V if the UVLO pin is left open circuit (Figure 3). Connect UVLO to VIN to set the undervoltage lockout to a minimum of 7.5V (Figure 4). This lockout voltage can also be changed with a resistive-divider from VIN to GND. The center node of the divider is connected to the UVLO pin (Figure 5). The values of R1 and R2 must satisfy the condition R1//R2 << 260k and R2 << 1.65M. R2 can be calculated as follows: R2 = R1 [(VUVLO / 7.5V) - 1] where VIN (UVLO) is the desired lockout voltage.
Figure 4. Minimum +7.5V UVLO Configuration
VIN 0.1F R2
VIN UVLO
VOUT MAX5910 VOUT IFAULT PGOOD GND 10k 10k
ENABLE R1 N.C.
+3.3V
Figure 5. Adjusting UVLO with an External Resistive-Divider
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9
+65V Simple Swapper Hot-Swap Switches MAX5910/MAX5917
Functional Diagram
CHARGE PUMP RSENSE IN OSC. VREF ON/OFF RUV1 1.236V RUV2 THERMAL SHUTDOWN UVLO
VIN + 8V
OUT IREG RPG1
BANDGAP REFERENCE
PG RPG2 VIN GND CONTROL LOGIC IFAULT PGOOD
GND
RUV3 GND
UVLO
ENABLE
Pin Configurations
TOP VIEW
UVLO
1
8 7
VOUT GND IFAULT PGOOD
N.C. 1 UVLO 2 VIN 3 GND 4
16 N.C. 15 N.C. 14 VOUT
VIN 2 N.C. 3
MAX5910
6 5
MAX5917A/B
13 GND 12 GND 11 IFAULT 10 PGOOD 9 N.C.
ENABLE 4
GND 5 N.C. 6
8 SO
ENABLE 7 N.C. 8
16 SO
10
______________________________________________________________________________________
+65V Simple Swapper Hot-Swap Switches MAX5910/MAX5917
Chip Information
TRANSISTOR COUNT: 1003 PROCESS: SG3ISO
Package Information
SOICN.EPS
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.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11 (c) 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.

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