Datasheet

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General Description

The MAX5904–MAX5909 dual hot-swap controllers

provide complete protection for dual-supply systems.

These devices hot swap two supplies ranging from +1V

to +13.2V, provided one supply is at or above 2.7V,

allowing the safe insertion and removal of circuit cards

into live backplanes.

The discharged filter capacitors of the circuit card pro-

vide low impedance to the live backplane. High inrush

currents from the backplane to the circuit card can burn

up connectors and components, or momentarily col-

lapse the backplane power supply leading to a system

reset. The MAX5904 family of hot-swap controllers pre-

vents such problems by gradually ramping up the output

voltage and regulating the current to a preset limit when

the board is plugged in, allowing the system to stabilize

safely. After the startup cycle is completed, two on-chip

comparators provide VariableSpeed/BiLevel™ protec-

tion against short-circuit and overcurrent faults, as well

as immunity against system noise and load transients. In

the event of a fault condition, the load is disconnected.

The MAX5905/MAX5907/MAX5909 must be unlatched

after a fault, and the MAX5904/MAX5906/MAX5908 auto-

matically restart after a fault.

The MAX5904 family offers a variety of options to reduce

component count and design time. All devices integrate

an on-board charge pump to drive the gates of low-cost,

external n-channel MOSFETs. The devices offer integrat-

ed features like startup current regulation and current

glitch protection to eliminate external timing resistors and

capacitors. The MAX5906–MAX5909 provide an open-

drain status output, an adjustable startup timer, an

adjustable current limit, an uncommitted comparator,

and output undervoltage/overvoltage monitoring.

The MAX5904/MAX5905 are available in 8-pin SO pack-

ages. The MAX5906–MAX5909 are available in space-

saving 16-pin QSOP packages.

Applications

PCI-Express

Applications

Basestation Line Cards

Network Switches or Routers

Solid-State Circuit Breaker

Power-Supply Sequencing

Hot Plug-In Daughter Cards

RAID

Features

♦ Safe Hot-Swap for +1V to +13.2V Power

Supplies

Requires One Input ≥ 2.7V

♦ Low 25mV Default Current-Limit Threshold

♦ Inrush Current Regulated at Startup

♦ Circuit Breaker Function

♦ Adjustable Circuit Breaker/Current-Limit

Threshold

♦ VariableSpeed/BiLevel Circuit-Breaker Response

♦ Autoretry or Latched Fault Management

♦ On/Off Sequence Programming

♦ Status Output Indicates Fault/Safe Condition

♦ Output Undervoltage and Overvoltage Monitoring

and/or Protection

MAX5904–MAX5909

Low-Voltage, Dual Hot-Swap Controllers/Power

Sequencers

________________________________________________________________ Maxim Integrated Products 1

GATE2

ONGND

IN2

SENSE2SENSE1

GATE1

IN1

NARROW SO

TOP VIEW

MAX5904

MAX5905

Pin Configurations

Ordering Information

19-2238; Rev 3; 9/05

EVALUATION KIT

AVAILABLE

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

PKG

CODE

MAX5904ESA*

-40°C to +85°C8 SO S8-4

MAX5904USA 0°C to +85°C8 SO S8-4

MAX5905ESA*

-40°C to +85°C8 SO S8-4

MAX5905USA 0°C to +85°C8 SO S8-4

MAX5906EEE*

-40°C to +85°C 16 QSOP

E16-1

MAX5906UEE 0°C to +85°C 16 QSOP

E16-1

MAX5907EEE*

-40°C to +85°C 16 QSOP

E16-1

MAX5907UEE 0°C to +85°C 16 QSOP

E16-1

MAX5908EEE*

-40°C to +85°C 16 QSOP

E16-1

MAX5908UEE 0°C to +85°C 16 QSOP

E16-1

MAX5909EEE*

-40°C to +85°C 16 QSOP

E16-1

MAX5909UEE 0°C to +85°C 16 QSOP

E16-1

Selector Guide and Typical Operating Circuits appear at end

of data sheet.

VariableSpeed/BiLevel is a trademark of Maxim Integrated

Products, Inc.

PCI-Express is a registered trademark of PCI-SIG Corp.

Pin Configurations continued at end of data sheet.

*Contact factory for availability.

Summary of content (24 pages)

PAGE 1
KIT ATION EVALU E L B AVAILA 19-2238; Rev 3; 9/05 Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers The MAX5904–MAX5909 dual hot-swap controllers provide complete protection for dual-supply systems. These devices hot swap two supplies ranging from +1V to +13.2V, provided one supply is at or above 2.7V, allowing the safe insertion and removal of circuit cards into live backplanes. The discharged filter capacitors of the circuit card provide low impedance to the live backplane.
PAGE 2
MAX5904–MAX5909 Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers ABSOLUTE MAXIMUM RATINGS IN_ to GND...........................................................................+14V GATE_ to GND..........................................+0.3V to (VIN_ + 6.2V) ON, PGOOD, COMP+, COMPOUT, TIM to GND.....-0.3V to the higher of (VIN1 + 0.3V) and (VIN2 + 0.3V) SENSE_, MON_, LIM_ to GND ...................-0.3V to (VIN_ + 0.3V) Current into Any Pin .........................................................
PAGE 3
Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers (VIN_ = +1V to +13.2V provided at least one supply is higher than +2.7V, VON = +2.7V, TA = 0°C to +85°C, unless otherwise noted. Typical values are at VIN1 = +5V, VIN2 = +3.3V, and TA = +25°C.) (Note 1) PARAMETER SYMBOL Channel 1 ON Threshold VON1,TH Channel 2 ON Threshold VON2,TH CONDITIONS Low to high MIN TYP MAX 0.80 0.825 0.85 1.95 25 2.
PAGE 4
MAX5904–MAX5909 Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers ELECTRICAL CHARACTERISTICS (VIN_ = +1V to +13.2V provided at least one supply is higher than +2.7V, VON = +2.7V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VIN1 = +5V, VIN2 = +3.3V, and TA = +25°C.) (Note 1) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS POWER SUPPLIES IN_ Input Voltage Range (Note 2) Supply Current VIN_ IIN Other VIN = +2.7V IIN1 + IIN2 1.0 1.2 13.2 V 2.
PAGE 5
Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers (VIN_ = +1V to +13.2V provided at least one supply is higher than +2.7V, VON = +2.7V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at VIN1 = +5V, VIN2 = +3.3V, and TA = +25°C.) (Note 1) PARAMETER ON Input Bias Current SYMBOL IBON CONDITIONS VIN1 = VIN2 = +13.2V MIN VON < 4.5V 0.03 VON > 4.5V 100 0.
PAGE 6
Typical Operating Characteristics (Typical Operating Circuits, Q1 = Q2 = Fairchild FDB7090L, VIN1 = +5V, VIN2 = +3.3V, TA = +25°C, unless otherwise noted. Channels 1 and 2 are identical in performance. Where characteristics are interchangeable, channels 1 and 2 are referred to as X and Y.) 1.8 1.6 IINX 0.8 0.6 IINY 0.4 10 12 VINY = 5.0V A) VON = 3.3V B) VON = 1.5V C) VON = 0V 14 0.2 2 4 6 8 10 12 -40 14 GATE-CHARGE CURRENT vs. TEMPERATURE 140 VINX = 13.
PAGE 7
Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers SLOW-COMP. THRESHOLD 1 TURN-OFF TIME (ms) VINX = 13.2V VINX = 5V 3 VON = 0V VINY = 2.7V VGATEX = VINX + 6.2V 2 VINX = 1V TURN-OFF TIME (ms) 5 10 MAX5904 toc11 10 MAX5904 toc10 FAST-COMP. THRESHOLD 0.1 0.01 SLOW-COMP. THRESHOLD 1 0.001 1 0 0.1 0.0001 -40 -15 10 35 60 85 0 25 50 75 20 25 30 35 40 45 50 55 60 65 70 75 80 100 125 150 175 200 TEMPERATURE (°C) VIN - VSENSE (mV) VIN - VSENSE (mV) SLOW-COMPARATOR THRESHOLD vs.
PAGE 8
MAX5904–MAX5909 Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers Typical Operating Characteristics (continued) (Typical Operating Circuits, Q1 = Q2 = Fairchild FDB7090L, VIN1 = +5V, VIN2 = +3.3V, TA = +25°C, unless otherwise noted. Channels 1 and 2 are identical in performance. Where characteristics are interchangeable, channels 1 and 2 are referred to as X and Y.
PAGE 9
Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers PIN MAX5904/ MAX5905 MAX5906– MAX5909 NAME FUNCTION — 10 LIM2 5 11 ON 6 12 GATE2 Channel 2 Gate-Drive Output. Connect to gate of external n-channel MOSFET. 7 13 SENSE2 Channel 2 Current-Sense Input. Connect RSENSE2 from IN2 to SENSE2. 8 14 IN2 — 15 INC+ Uncommitted Comparator Noninverting Input — 16 OUTC Uncommitted Comparator Open-Drain Output. Actively held low when VINC+ is less than 1.236V.
PAGE 10
OUT1 Q1 RSENSE1 MON1 GATE1 SENSE1 IN1 1.236V 3mA VSC, TH INC+ RLIM1 UVLO ON 2.4V SLOW COMP. FAST COMP. 543mV N RTIM OUTC TIM STARTUP OSCILLATOR TO STARTUP LOGIC BLOCKS 0.4V 0.825V PGOOD CHARGE PUMP OSCILLATOR 543mV 100µA 687mV N CHARGE PUMP 687mV TO STARTUP LOGIC BLOCKS CURRENT CONTROL AND STARTUP LOGIC UVLO 100µA 2.025V DEVICE CONTROL LOGIC TIMING OSCILLATOR BIAS AND REFERENCES FAST DISCHARGE 2.4V SLOW DISCHARGE CURRENT CONTROL AND STARTUP LOGIC SLOW COMP.
PAGE 11
Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers ON PGOOD tSTART + tPGDLY VGATE 4.8V TO 5.8V VOUT VTH Undervoltage Lockout (UVLO) VGATE VOUT CBOARD = LARGE VSU,TH Fast-Comparator Normal Operation In normal operation, if the load current reaches the fastcomparator threshold, a fault is generated, PGOOD is pulled low, and the MOSFET gates are discharged with a strong 3mA pulldown current. This happens in the event of a serious current overload or a dead short.
PAGE 12
Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers MAX5904–MAX5909 Timing Diagrams VON VON_,TH VGATE_ VOUT_ INTERNAL SIGNAL tSTART INTERNAL SIGNAL tPGDLY PGOOD Figure 3.
PAGE 13
Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers OVERCURRENT CONDITION (VIN_ - VSENSE_ ≥ VSC_TH AND VIN_ - VSENSE_ < VFC_TH) tSCD IOUT VGATE_ DISCHARGE RATE DEPENDS ON OUTPUT LOADING VOUT_ PGOOD Figure 4. Power-Down when an Overcurrent Fault Occurs SHORT-CIRCUIT CONDITION (VIN_ - VSENSE_ ≥ VFC_TH) tFCD IOUT VGATE_ VOUT_ PGOOD Figure 5.
PAGE 14
Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers MAX5904–MAX5909 Timing Diagrams (continued) UV/OV CONDITION INTERNAL SIGNAL MON_ GLITCH FILTER, 20µS VGATE_ DISCHARGE RATE DEPENDS ON OUTPUT LOADING VOUT_ PGOOD Figure 6. Power-Down when an Undervoltage/Overvoltage Fault Occurs (MAX5906/MAX5907) UV/OV CONDITION INTERNAL SIGNAL MON_ GLITCH FILTER, 20µS VGATE_ VGATE_ AND VOUT_ STAY ON VOUT_ PGOOD Figure 7.
PAGE 15
Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers VIN_ VUVLO VGATE_ VOUT_ tD,UVLO INTERNAL SIGNAL tSTART INTERNAL SIGNAL tPGDLY PGOOD Figure 8. Power-Up with Undervoltage Lockout Delay (VON = 2.
PAGE 16
MAX5904–MAX5909 Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers Output Voltage Monitor The MAX5905–MAX5909 monitor the output voltages with the MON1 and MON2 window comparator inputs. These voltage monitors are enabled after the startup period. Once enabled, the voltage monitor detects a fault if V MON _ is less than 543mV or greater than 687mV. If an output voltage fault is detected PGOOD pulls low.
PAGE 17
Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers PART NUMBER MANUFACTURER IRF7413 between 4kΩ and 500kΩ. The MAX5906–MAX5909 startup period has a default value of 9ms when TIM is left floating. Calculate RTIM with the following equation: DESCRIPTION 11mΩ, 8 SO, 30V International Rectifier IRF7401 22mΩ, 8 SO, 20V IRL3502S 6mΩ, D2PAK, 20V MMSF3300 20mΩ, 8 SO, 30V Motorola MMSF5N02H 30mΩ, 8 SO, 20V MTB60N05H 14mΩ, D2PAK, 50V FDS6670A 10mΩ, 8SO, 30V Fairchild NDS8426A 13.
PAGE 18
MAX5904–MAX5909 Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers QGATE is the MOSFET total gate charge IGATE is the gate charging/discharging current In this case, the inrush current depends on the MOSFET gate-to-drain capacitance (C rss) plus any additional capacitance from gate to GND (CGATE), and on any load current (ILOAD) present during the startup period.
PAGE 19
Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers Input Transients SLOW COMPARATOR The voltage at IN1 or IN2 must be above the UVLO during inrush and fault conditions. When a short-circuit condition occurs on the board, the fast comparator trips causing the external MOSFET gates to be discharged at 3mA. The main system power supply must be able to sustain a temporary fault current, without dropping below the UVLO threshold of 2.4V, until the external MOSFET is completely off.
PAGE 20
MAX5904–MAX5909 Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers RSENSE1 Q1 V1 OUT1 CBOARD1 IN1 R1 ON VEN SENSE1 GATE1 ON OFF MAX5904 MAX5905 C1 GND GND IN2 SENSE2 GATE2 OUT2 V2 Q2 RSENSE2 CBOARD2 VEN VON2, TH t1 = -R1C1 ln (V EN - VON1, TH t2 = -R1C1 ln (V EN - VON2, TH VEN ) VON VON1, TH V1 VEN ) V2 tDELAY = -R1C1 ln t0 t1 ( VV ) > 20µs EN - VON1, TH EN - VON2, TH t2 TDELAY Figure 11.
PAGE 21
Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers IN SENSE SENSE RESISTOR GATE µP INC+ MAX5906–MAX5909 RESET OUTC MAX590_ Figure 12. Power-On Reset Figure 14.
PAGE 22
Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers MAX5904–MAX5909 Typical Operating Circuits BACKPLANE REMOVABLE CARD RSENSE1 Q1 V1 OUT1 0.1µF CBOARD1 IN1 * ON SENSE1 GATE1 ON * MAX5904 MAX5905 GND GND IN2 SENSE2 GATE2 0.1µF OUT2 V2 Q2 RSENSE2 CBOARD2 *OPTIONAL COMPONENTS BACKPLANE REMOVABLE CARD RSENSE1 Q1 V1 OUT1 * CBOARD1 0.
PAGE 23
Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers N E H INCHES MILLIMETERS MAX MIN 0.069 0.053 0.010 0.004 0.014 0.019 0.007 0.010 0.050 BSC 0.150 0.157 0.228 0.244 0.016 0.050 MAX MIN 1.35 1.75 0.10 0.25 0.35 0.49 0.25 0.19 1.27 BSC 3.80 4.00 5.80 6.20 0.40 SOICN .EPS DIM A A1 B C e E H L 1.27 VARIATIONS: 1 INCHES TOP VIEW DIM D D D MIN 0.189 0.337 0.386 MAX 0.197 0.344 0.394 MILLIMETERS MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.
PAGE 24
Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) QSOP.EPS MAX5904–MAX5909 Low-Voltage, Dual Hot-Swap Controllers/Power Sequencers Revision History Pages changed at Rev 3: 1, 2, 3, 4, 5, 24 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied.