LT1640L/LT1640H Negative Voltage Hot Swap Controller FEATURES DESCRIPTIO n Allows Safe Board Insertion and Removal The LT 1640L/LT1640H is an 8-pin, negative voltage Hot TM from a Live 48V Backplane Swap controller that allows a board to be safely inserted n Operates from 10V to 80V and removed from a live backplane. Inrush current is n Programmable Inrush Current limited to a programmable value by controlling the gate n Programmable Electronic Circuit Breaker voltage of an external N-channel pass transistor. The pass n Programmable Overvoltage Protection transistor is turned off if the input voltage is less than the n Programmable Undervoltage Lockout programmable undervoltage threshold or greater than the n Power Good Control Output overvoltage threshold. A programmable electronic circuit breaker protects the system against shorts. The PWRGD U (LT1640L) or PWRGD (LT1640H) signal can be used to APPLICATIO S directly enable a power module. The LT1640L is designed for modules with a low enable input and the LT1640H for n Central Office Switching modules with a high enable input. n 48V Distributed Power Systems n Negative Power Supply Control The LT1640L/LT1640H is available in 8-pin PDIP and 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) GND GND Input Inrush Current 8 R4 562k V DD 1% 3 INRUSH UV R5 1 CURRENT LT1640L PWRGD 9.09k 1A/DIV 2 1% OV UV = 37V R6 V SENSE GATE DRAIN EE 10k GATE V 1% EE 4 56 7 OV = 71V 10V/DIV 1N4148 * R2 C1 R3 150nF 10W C2 18k R1 DRAIN 5% 3.3nF 25V 0.02W 5% 50V/DIV 100V 3 4 5% 48V V EE 2 1 2 Q1 50V/DIV IRF530 ON/OFF 1 9 + + 5V V V IN OUT CONTACT 8 + * DIODES INC. SMAT70A SENSE BOUNCE C3 + C4 + C5 THESE COMPONENTS ARE APPLICATION 7 0.1m F 100m F TRIM 100m F 1640 F06b SPECIFIC AND MUST BE SELECTED BASED 100V 100V 6 16V 5ms/DIV UPON OPERATING CONDITIONS AND DESIRED SENSE 4 5 PERFORMANCE. SEE APPLICATIONS V V IN OUT INFORMATION. 1640 TA01 LUCENT JW050A1-E 1640lhfb 1 U ULT1640L/LT1640H ABSOLUTE MAXIMUM RATINGS (Note 1), All Voltages Referred to V EE Supply Voltage (V V ) .................... 0.3V to 100V Operating Temperature Range DD EE DRAIN, PWRGD, PWRGD Pins ............... 0.3V to 100V LT1640LC/LT1640HC ............................. 0 C to 70 C SENSE, GATE Pins .................................... 0.3V to 20V LT1640LI/LT1640HI .......................... 40 C to 85 C UV, OV Pins .............................................. 0.3V to 60V Storage Temperature Range ................ 65 C to 150 C Maximum Junction Temperature ......................... 125 C Lead Temperature (Soldering, 10 sec)................. 300 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 LT1640LCN8 LT1640HCN8 OV 2 7 DRAIN OV DRAIN 2 7 LT1640LCS8 LT1640HCS8 UV 3 6 GATE UV 3 6 GATE LT1640LIN8 LT1640HIN8 V 4 5 SENSE V 4 5 SENSE EE LT1640LIS8 LT1640HIS8 EE 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) JMAX JA 1640L T = 125 C, q = 150 C/W (S8) 1640H JMAX JA 1640LI 1640HI Consult LTC Marketing 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 1640lhfb 2 U WU U WWW