LT1640AL/LT1640AH Negative Voltage Hot Swap Controller FEATURES DESCRIPTIO n Allows Safe Board Insertion and Removal The LT 1640AL/LT1640AH are 8-pin, negative voltage TM from a Live 48V Backplane Hot Swap controllers that allow a board to be safely n Operates from 10V to 80V inserted and removed from a live backplane. Inrush cur- n Programmable Inrush Current rent is limited to a programmable value by controlling the n Allows 50mA of Reverse Drain Pin Current gate voltage of an external N-channel pass transistor. The n Programmable Electronic Circuit Breaker pass transistor is turned off if the input voltage is less than n Programmable Overvoltage Protection the programmable undervoltage threshold or greater than n Programmable Undervoltage Lockout the overvoltage threshold. A programmable electronic n Power Good Control Output circuit breaker protects the system against shorts. The PWRGD (LT1640AL) or PWRGD (LT1640AH) signal can U be used to directly enable a power module. The LT1640AL APPLICATIO S is designed for modules with a low enable input and the LT1640AH for modules with a high enable input. n Central Office Switching n 48V Distributed Power Systems The LT1640AL/LT1640AH are available in 8-pin PDIP and n Negative Power Supply Control SO packages. , LTC and LT are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation. TYPICAL APPLICATIO (SHORT PIN) Input Inrush Current GND GND 8 R4 562k V DD CONTACT 1% 3 BOUNCE UV = 37V UV R5 1 LT1640AL PWRGD 9.09k 2 1% OV OV = 71V R6 V SENSE GATE DRAIN EE 10k 1% 4 56 7 * C1 R2 R3 10W C2 150nF 18k R1 25V 5% 3.3nF 5% 0.02W 100V 3 4 5% 48V 2 1 2 Q1 IRF530 ON/OFF 1 9 + + V V 5V IN OUT 8 + * DIODES INC. SMAT70A SENSE C3 + C4 + C5 THESE COMPONENTS ARE APPLICATION 7 0.1m F 100m F TRIM 100m F SPECIFIC AND MUST BE SELECTED BASED 100V 6 100V 16V UPON OPERATING CONDITIONS AND DESIRED SENSE 4 5 PERFORMANCE. SEE APPLICATIONS V V IN OUT INFORMATION. 1640A F07b 1640A TA01 LUCENT JW050A1-E 1 U ULT1640AL/LT1640AH ABSOLUTE MAXIMUM RATINGS (Note 1), All Voltages Referred to V EE Supply Voltage (V V ) .................... 0.3V to 100V Operating Temperature Range DD EE PWRGD, PWRGD Pins ........................... 0.3V to 100V LT1640ALC/LT1640AHC ........................ 0 C to 70 C DRAIN Pin ................................................. 2V to 100V LT1640ALI/LT1640AHI ...................... 40 C to 85 C SENSE, GATE Pins .................................... 0.3V to 20V Storage Temperature Range ................ 65 C to 150 C UV, OV Pins .............................................. 0.3V to 60V Lead Temperature (Soldering, 10 sec)................. 300 C Maximum Junction Temperature ......................... 125 C / PACKAGE ORDER I FOR ATIO ORDER PART ORDER PART NUMBER NUMBER TOP VIEW TOP VIEW PWRGD 1 8 V PWRGD 1 8 V DD DD LT1640ALCN8 LT1640AHCN8 OV 2 7 DRAIN OV 2 7 DRAIN LT1640ALCS8 LT1640AHCS8 UV 3 6 GATE UV 3 6 GATE LT1640ALIN8 LT1640AHIN8 V 4 5 SENSE V 4 5 SENSE EE LT1640ALIS8 EE LT1640AHIS8 N8 PACKAGE S8 PACKAGE N8 PACKAGE S8 PACKAGE 8-LEAD PDIP 8-LEAD PLASTIC SO 8-LEAD PDIP 8-LEAD PLASTIC SO S8 PART MARKING S8 PART MARKING T = 125 C, q = 120 C/W (N8) T = 125 C, q = 120 C/W (N8) JMAX JA JMAX JA T = 125 C, q = 150 C/W (S8) 1640AL T = 125 C, q = 150 C/W (S8) 1640AH JMAX JA JMAX JA 640ALI 640AHI Consult factory for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. (Note 2), V = 48V, V = 0V unless otherwise noted. A DD EE SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS DC V Supply Operating Range l 10 80 V DD I Supply Current UV = 3V, OV = V , SENSE = V l 1.3 5 mA DD EE EE V Circuit Breaker Trip Voltage V = (V V ) l 40 50 60 mV CB CB SENSE EE I GATE Pin Pull-Up Current Gate Drive On, V = V l 30 45 60 m A PU GATE EE I GATE Pin Pull-Down Current Any Fault Condition 24 50 70 mA PD I SENSE Pin Current V = 50mV 20 m A SENSE SENSE D V External Gate Drive (V V ), 15V V 80V l 10 13.5 18 V GATE GATE EE DD (V V ), 10V V < 15V l 68 15 V GATE EE DD V UV Pin High Threshold Voltage UV Low to High Transition l 1.213 1.243 1.272 V UVH V UV Pin Low Threshold Voltage UV High to Low Transition l 1.198 1.223 1.247 V UVL V UV Pin Hysteresis 20 mV UVHY I UV Pin Input Current V = V l 0.02 0.5 m A INUV UV EE V OV Pin High Threshold Voltage OV Low to High Transition l 1.198 1.223 1.247 V OVH V OV Pin Low Threshold Voltage OV High to Low Transition l 1.165 1.203 1.232 V OVL V OV Pin Hysteresis 20 mV OVHY I OV Pin Input Current V = V l 0 .03 0.5 m A INOV OV EE 2 U WU U WWW