Linear Technology LT4363 Datasheet Download Page 19

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LT4363

4363fb

For more information

www.linear.com/LT4363

Typical applicaTions

2.5A, 48V Hot Swap with Overvoltage Output Regulation at 72V

2.5A, 28V Hot Swap with Overvoltage Output Regulation at 36V

TMR

0.1µF

SNS

15mΩ

FDB3632

OUT

48V, 2.5A

4363 TA03

LT4363DE-2

GND TMR

OUT

SNS

D1*

SMAT70A

4.02k

221k

GATE

10Ω

SHDN

*DIODES INC.

UV = 35V

OV = 80V

FLT

ENOUT

300µF

13k

10k

604k

47nF

0.1µF

TMR

0.1µF

SNS

15mΩ

IRLR2908

28V

OUT

28V, 2.5A

4363 TA04

LT4363DE-2

GND TMR

OUT

SNS

D1*

SMAJ58A

4.02k

110k

GATE

10Ω

SHDN

*DIODES INC.

UV = 18V

OV = 36V

FLT

ENOUT

300µF

10k

261k

47nF

0.1µF

Summary of Contents for LT4363

Page 1: ...lieu of a Schottky diode for reverse input protection reducing voltage drop and power loss A shutdown pin reduces the quiescent current to less than 7 A during shutdown Typical Application Features De...

Page 2: ...14 13 12 11 10 9 OUT SNS NC GATE NC VCC NC SHDN FB TMR NC ENOUT FLT GND UV GND TJMAX 125 C JA 80 C W LT4363 2 LT4363 2 LT4363 2 12 11 10 9 8 7 13 GND 1 2 3 4 5 6 TMR ENOUT FLT GND UV OV FB OUT SNS GAT...

Page 3: ...LT4363MPS 1 TRPBF LT4363S 1 16 Lead Plastic SO 55 C to 125 C LT4363CS 2 PBF LT4363CS 2 TRPBF LT4363S 2 16 Lead Plastic SO 0 C to 70 C LT4363HS 2 PBF LT4363HS 2 TRPBF LT4363S 2 16 Lead Plastic SO 40 C...

Page 4: ...d VCC 7V to 80V TMR Rising l 3 5 4 3 5 4 V VUV UV Input Threshold UV Rising l 1 24 1 275 1 31 V VUV HYST UV Input Hysteresis 12 mV VOV OV Input Threshold OV Rising l 1 24 1 275 1 31 V VOV HYST OV Inpu...

Page 5: ...VCC V 0 I CC A 1000 800 600 400 200 0 4363 G01 80 70 60 50 20 40 10 30 VCC V 0 I CC A 6 5 4 3 2 1 0 4363 G03 80 70 60 50 20 40 10 30 OUT SNS 0V TEMPERATURE C 50 I CC A 8 7 5 6 4 2 3 1 0 0 50 25 25 100...

Page 6: ...0 50 25 25 100 4363 G10 125 75 VCC SNS OUT IGATE 1 A IGATE 0 A VCC V 0 V GATE V 16 10 8 14 12 6 4 2 0 4363 G11 80 70 60 20 8 16 4 12 VCC SNS OUT IGATE 0 A IGATE 1 A VCC V 0 V TMR V 5 4 3 2 1 4363 G12...

Page 7: ...Time vs Temperature Specifications are at VCC 12V TA 25 C unless otherwise noted TEMPERATURE C 50 0 50 25 25 100 125 75 t OFF OV ns 350 200 100 300 150 250 50 0 4363 G19 TEMPERATURE C 50 0 50 25 25 1...

Page 8: ...ol Input The LT4363 can be shutdown to a low current mode by pulling the SHDN pin below the threshold of 0 4V Pull this pin above 2 1V or disconnect it to allow the internal current source to turn the...

Page 9: ...ion www linear com LT4363 Block Diagram SNS VCC SHDN OV LT4363 2 ONLY IA 50mV 25mV 2 A 1 375V 14V 1 275V 1 275V 4 3V 1 275V 0 5V OUT TMR GND GATE UV 4363 BD VCC ITMR FLT ENOUT FB CHARGE PUMP CONTROL L...

Page 10: ...will then return to a high impedance state For the latch off version LT4363 1 both the GATE and FLT pins remain low even after TMR has reached the 0 5V threshold Allow sufficient time for TMR to disch...

Page 11: ...of fault and the VDS voltage drop across the MOSFET This scheme takes better advantage of the MOSFET s available SafeOperatingArea SOA thanwouldafixedtimercurrent The TMR pin is biased to 0 5V under n...

Page 12: ...tween the onset of current limiting and turn off is given by tLIM CTMR 0 875V ITMR Because ITMR is a function of VCC VOUT the exact time in current limit depends upon the input waveform and the timere...

Page 13: ...lows the use of standard threshold voltage N channel MOSFETs For systems with VCC less than 9V a logic level MOSFET is required since the gate drive can be as low as 4 5V The SOA of the MOSFET must en...

Page 14: ...level of the MOSFET Calculating Transient Stress To select a MOSFET suitable for any given application the SOA stress must be calculated for each input transient whichshallnotinterruptoperation Itisth...

Page 15: ...gure 5 threshold during a fault The pass transistor is not allowed toturnbackonevenafterthecooldownperiodhasfinished ThispreventsthepasstransistorfromcyclingbetweenON and OFF states when the input vol...

Page 16: ...red voltage due to R7 and C1 at the VCC pin is below 100V The inclusion of R7 in series with the VCC pin will increase the minimum required voltage at VIN due to the extravoltagedropacrossit Thisvolta...

Page 17: ...0ms With 0 1 F of bypass capacitance C2 along with 1k of R7 high voltage transients up to 200V with a pulse width less than 10 s are filtered out at the VCC pin Next calculate the resistive divider va...

Page 18: ...otal overcurrent fault time when VOUT 2V is tOC 47nF 0 875V 40 A 1 028ms The power dissipation in Q1 is P 14V 2V 50mV 10m 60W These conditions are well within the Safe Operating Area of the FDB33N25 C...

Page 19: ...4363DE 2 GND TMR 9 12 OUT 2 SNS 3 FB 1 D1 SMAT70A R2 4 02k R1 221k R7 1k GATE 4 R3 10 SHDN 6 UV DIODES INC UV 35V OV 80V 8 VCC 5 OV 7 FLT ENOUT 10 11 CL 300 F R5 13k R6 10k R4 604k C1 47nF C2 0 1 F CT...

Page 20: ...57 6k GATE 4 VCC 5 R3 10 DIODES INC SANYO 25CE22GA OPTIONAL COMPONENT FOR REDUCED STANDBY CURRENT SHDN 6 UV 8 OV 7 FLT ENOUT 10 11 CL 22 F Q2 IRLR2908 D1 SMAJ58CA R7 10k R5 1M Q3 2N3904 D2 1N4148 D3...

Page 21: ...XPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE MOLD FLASH MOLD FLASH IF PRESENT SHALL NOT EXCEED 0 15mm ON ANY SIDE 5 EXPOSED PAD SHALL BE SOLDER PLATED 6 SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOC...

Page 22: ...04 MAX 0 254 010 0 6 TYP DETAIL A DETAIL A GAUGE PLANE 5 10 201 MIN 3 20 3 45 126 136 0 889 0 127 035 005 RECOMMENDED SOLDER PAD LAYOUT 0 42 0 038 0165 0015 TYP 0 65 0256 BSC 4 039 0 102 159 004 NOTE...

Page 23: ...hanged to 4mA from 3mA IGATE UP At 12V changed from 10 20 35 A to 15 30 45 A At 48V changed from 10 25 40 A to 20 40 65 A Current Limit Sense Voltage At 12V improved from 43mV 58mV to 45mV 55mV At 48V...

Page 24: ...4mm 4mm QFN 28 SSOP 28 Packages LTC3890 Low IQ Dual 2 Phase Synchronous Step Down Controller 4V VIN 60V 0 8V VOUT 24V 50 A Quiescent Current LT4256 1 Positive 48V Hot Swap Controller with Open Circuit...

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