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LTC4260

4260fc

For more information

www.linear.com/LTC4260

applicaTions inForMaTion

BACKPLANE PLUG-IN

CARD

2.05k

9
8

18
13
20
14
12

5.76k

12V

SDA

SCL

ALERT

GND

SENSE

LTC4260GN

INTV

ADR0 ADR1

ADR2

100k

Si7880DP

0.003Ω

10Ω

22nF

6.65k

2.94k

0.68µF

100k

1000µF

0.1µF

25V

GATE

GND

ADIN
GPIO

BD_PRST

TIMER

4260 F12

SOURCE

OV
SDAO
SDAI
SCL

ALERT

Figure 12. 12A, 12V Card Resident Application

Figure 13. 3A, –48V Card Resident Application

BACKPLANE

PLUG-IN

CARD

2.67k

1.74k

8
7

18
13
20
14
12

4260 F13

49.9k

GND

–48V

SENSE

LTC4260GN

INTV

ADR0 ADR1

ADR2

100k

FDB3632

0.01Ω

10Ω

6.8nF

43.7k

OUTPUT

3.57k

68nF

330µF

100V

–48V

0.1µF

CMPTA42

OPTIONAL 5V

R14

0.1µF

GATE

GND

ADIN
GPIO

BD_PRST

TIMER

SOURCE

SDAI
SDA0
SCL
ON

SCL

SDA

3.3V

MOC207

–48V

INTV

10k

INTV

5.1k

R12

10k

R15

100Ω

R13

3.4k

R10

3.4k

–48V

SMBT70A

*MAXIMUM LOAD ON INTV

IS 4.5mA

Содержание LTC4260

Страница 1: ...o Live Backplane n 8 Bit ADC Monitors Current and Voltage n I2C SMBus Interface n Wide Operating Voltage Range 8 5V to 80V n High Side Drive for External N Channel MOSFET n Input Overvoltage Undervolt...

Страница 2: ...age Temperature Range GN SW Packages 65 C to 150 C UH Package 65 C to 125 C Lead Temperature Soldering 10 sec GN SW Packages Only 300 C Supply Voltages VDD 0 3V to 100V Input Voltages SENSE VDD 10V or...

Страница 3: ...resis l 70 90 120 mV IOV IN OV Pin Input Current VOV 3 5V l 0 1 A VUV TH UV Pin Threshold Voltage VUV Rising l 3 43 3 5 3 56 V VUV HYST UV Pin Hysteresis l 310 380 440 mV IUV IN UV Pin Input Current V...

Страница 4: ...0 5 3 s tPHL SENSE VDD SENSE High to GATE Low VDD SENSE 200mV CGATE 10nF l 0 4 1 s ADC Resolution No Missing Codes Note 4 l 8 Bits Integral Nonlinearity VDD SENSE Note 5 SOURCE ADIN l l l 0 5 0 5 0 5...

Страница 5: ...Maximum Ratings may cause permanent damage to the device Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime Note 2 All currents into devi...

Страница 6: ...75 100 TEMPERATURE C 50 0 34 UV HYSTERESIS V 0 35 0 36 0 37 0 38 0 39 25 0 25 50 4260 G03 75 100 TEMPERATURE C 50 1 220 ON BD_PRST LOW HIGH THRESHOLD V 1 225 1 230 1 235 1 240 1 245 25 0 25 50 4260 G0...

Страница 7: ...75 100 IGATE A 0 GATE DRIVE V GATE V SOURCE V 8 10 12 20 4260 G10 6 4 0 5 10 15 2 16 14 VDD 80V VDD 48V VDD 12V VDD V 5 GATE DRIVE V GATE V SOURCE V 12 14 16 20 30 4260 G11 10 8 10 15 25 35 85 C 25 C...

Страница 8: ...turn on rate and compensates the active current limit During turn off there is a 1mA pull down current During a short circuit or undervoltage lockout VDD or INTVCC a 600mA pull down current source be...

Страница 9: ...n also serves as the ADC input to monitor output voltage The pin provides a return for the gate pull down circuit and as a supply for the charge pump circuit TIMER TimerInput Connectacapacitorbetweent...

Страница 10: ...V 2V PWRGD FET ON PG RST BP BOARD PRESENT 1 235V 0 2V LOGIC TM2 UVLO2 ON UVLO1 FB OV GN UH ONLY BD_PRST ON 10 A SDAI SDAO SCL ALERT ADR0 ADR1 ADR2 GND UH ONLY EXPOSED PAD VDD ADIN 1 OF 27 8 3 8V VCC U...

Страница 11: ...erheating At this point the TIMER pin ramps down us ing the 2 A current source until the voltage drops below tSU DAT tSU STO tSU STA tBUF tHD STA tSP tSP tHD DATO tHD DATI tHD STA START CONDITION STOP...

Страница 12: ...ol registers are set or cleared as described in the register section After the power on reset pulse the LTC4260 will go through the following turn on sequence First the UV and OV pins must indicate th...

Страница 13: ...nst excessive power dissipation in theswitchduringactivecurrentlimit theavailablecurrent is reduced as a function of the output voltage sensed by the FB pin The device also features a variable overcur...

Страница 14: ...f UV is below its 3 12VthresholdafterINTVCCcrossesits4 5Vundervoltage lockout threshold an undervoltage fault will be logged in the fault register Board Present Change of State Whenever the BD PRST pi...

Страница 15: ...s means repeated or continuing faults will not generate alerts until the associated FAULT register bit has been cleared Resetting Faults Faults are reset with any of the following conditions First a s...

Страница 16: ...H there is a chance that the supply could collapse before the active current limit circuit brings down the GATE pin In this case the undervoltage monitors turn off the pass FET The undervoltage lockou...

Страница 17: ...R2 R3 R7 and R8 for the UV OV and PG threshold voltages VOVRISING 71 2V VOVFALLING 69 44V using VOV TH 3 5V rising and 3 41V falling VUVRISING 43V VUVFALLING 38 5V using VUV TH 3 5V rising and 3 12V...

Страница 18: ...e SMBus Alert Response Protocol Applications Information Acknowledge The acknowledge signal is used for handshaking between thetransmitterandthereceivertoindicatethatthelastbyte of data was received T...

Страница 19: ...begins by sending a START bit followed by the special Alert Response Address 0001 100 b with the R W bit set to one Any LTC4260 that is pulling its ALERT pin low will acknowledge and begin sending ba...

Страница 20: ...SLAVE TO MASTER A ACKNOWLEDGE LOW A NOT ACKNOWLEDGE HIGH R READ BIT HIGH W WRITE BIT LOW S START CONDITION P STOP CONDITION COMMAND DATA X X X X X b2 b0 0 W 0 0 0 b7 b0 A A A P S ADDRESS 1 0 a4 a0 COM...

Страница 21: ...X L L L 5 8A 1 0 0 0 1 0 1 X L H H 6 8C 1 0 0 0 1 1 0 X L L NC 7 8E 1 0 0 0 1 1 1 X L L H 8 90 1 0 0 1 0 0 0 X NC NC L 9 92 1 0 0 1 0 0 1 X NC H NC 10 94 1 0 0 1 0 1 0 X NC NC NC 11 96 1 0 0 1 0 1 1...

Страница 22: ...A7 6 GPIO Configure Configures Behavior of GPIO Pin FUNCTION A6 A7 GPIO PIN Power Good Default 0 0 GPIO C3 Power Bad 0 1 GPIO C3 General Purpose Output 1 0 GPIO B6 General Purpose Input 1 1 GPIO Hi Z...

Страница 23: ...tage Condition 1 Enable Alert 0 Disable Alert Default B0 Overvoltage Alert Enables Alert for Overvoltage Condition 1 Enable Alert 0 Disable Alert Default Table 5 STATUS Register C 02h Read Only BIT NA...

Страница 24: ...was High and Gate was High or Low D2 Overcurrent Fault Occurred Indicates Overcurrent Fault Occurred 1 Overcurrent Fault Occurred 0 No Overcurrent Faults D1 Undervoltage Fault Occurred Indicates Input...

Страница 25: ...I SCL ALERT ON Figure 12 12A 12V Card Resident Application Figure 13 3A 48V Card Resident Application 16 6 17 UV BACKPLANE PLUG IN CARD R3 2 67k 1 R2 1 74k 1 4 5 9 10 8 7 2 1 24 23 18 13 20 14 12 19 1...

Страница 26: ...0 25 0532 0688 1 35 1 75 008 012 0 203 0 305 TYP 004 0098 0 102 0 249 0250 0 635 BSC 033 0 838 REF 254 MIN RECOMMENDED SOLDER PAD LAYOUT 150 165 0250 BSC 0165 0015 045 005 DIMENSION DOES NOT INCLUDE M...

Страница 27: ...004 012 0 102 0 305 093 104 2 362 2 642 050 1 270 BSC 014 019 0 356 0 482 TYP 0 8 TYP NOTE 3 009 013 0 229 0 330 016 050 0 406 1 270 291 299 7 391 7 595 NOTE 4 45 010 029 0 254 0 737 420 MIN 325 005...

Страница 28: ...LL NOT EXCEED 0 20mm ON ANY SIDE 5 EXPOSED PAD SHALL BE SOLDER PLATED 6 SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE TOP AND BOTTOM OF PACKAGE PIN 1 TOP MARK NOTE 6 0 40 0 10 31 1 2 32 BO...

Страница 29: ...TE DESCRIPTION PAGE NUMBER B 1 12 Revised Conditions and Min value for IGATE FST Corrected typographical error in Layout Considerations section 3 17 C 5 13 Removed erroneous temperature dot from VGPIO...

Страница 30: ...TC4252 48V Hot Swap Controller in MSOP Fast Active Current Limiting with Drain Accelerated Response Supplies from 15V LT4256 Positive 48V Hot Swap Controller with Open Circuit Detect Foldback Current...

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Linear Technology LTC4260, Техническое описание

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