LT4250LIN8#PBF Linear Technology, LT4250LIN8#PBF Datasheet
LT4250LIN8#PBF
Specifications of LT4250LIN8#PBF
Available stocks
Related parts for LT4250LIN8#PBF
LT4250LIN8#PBF Summary of contents
Page 1
... LT4250H for modules with a high enable input. The LT4250L/LT4250H are available in 8-pin PDIP and SO packages L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Hot Swap is a trademark of Linear Technology Corporation ...
Page 2
... T = 125°C, θ = 150°C/W (S8) JMAX JA ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL LT4250LCN8#PBF LT4250LCN8#TRPBF LT4250LCS8#PBF LT4250LCS8#TRPBF LT4250LIN8#PBF LT4250LIN8#TRPBF LT4250LIS8#PBF LT4250LIS8#TRPBF LT4250HCN8#PBF LT4250HCN8#TRPBF LT4250HCS8#PBF LT4250HCS8#TRPBF LT4250HIN8#PBF LT4250HIN8#TRPBF LT4250HIS8#PBF LT4250HIS8#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. ...
Page 3
ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T SYMBOL PARAMETER DC V Supply Voltage Operating Range DD I Supply Current DD V Undervoltage Lockout UVL V Current Limit Trip Voltage CL I GATE Pin Pull-Up Current PU I ...
Page 4
LT4250L/LT4250H TYPICAL PERFORMANCE CHARACTERISTICS Supply Current vs Supply Voltage 1 25°C A 1.7 1.6 1.5 1.4 1.3 1.2 1 SUPPLY VOLTAGE (V) 4250 G01 Gate Voltage vs Temperature 15 48V ...
Page 5
PIN FUNCTIONS PWRGD/PWRGD (Pin 1): Power Good Output Pin. This pin will latch a power good indication when and V is within GATE GH can be connected directly to the enable pin of ...
Page 6
LT4250L/LT4250H BLOCK DIAGRAM – REF – + 50mV OV V SENSE AND CC UVLO REFERENCE GENERATOR LOGIC – + – 500μs GATE DELAY DRIVER + GATE V CC REF OUTPUT PWRGD/PWRGD DRIVE + ...
Page 7
TEST CIRCUIT PWRGD/PWRGD DRAIN V OV LT4250L/LT4250H UV GATE SENSE EE Figure 1a. Test Circuit 1 TIMING DIAGRAM 2V 1.255V PHLOV GATE 1V Figure ...
Page 8
LT4250L/LT4250H APPLICATIONS INFORMATION Hot Circuit Insertion When circuit boards are inserted into a live –48V back- plane, the bypass capacitors at the input of the board’s power module or switching power supply can draw huge transient currents as they charge ...
Page 9
APPLICATIONS INFORMATION DRAIN voltage has finished ramping, the GATE pin then ramps to its final value. Current Limit/Electronic Circuit Breaker The LT4250 features a current limit function that protects against short circuits or excessive supply currents. If the current limit ...
Page 10
LT4250L/LT4250H APPLICATIONS INFORMATION A circuit that automatically resets the circuit breaker after a current fault is shown in Figure 10. Transistors Q2 and Q3 along with R7, R8, C4 and D1 form a programmable one-shot circuit. Before a short occurs, ...
Page 11
APPLICATIONS INFORMATION Undervoltage and Overvoltage Detection The UV (Pin 3) and OV (Pin 2) pins can be used to detect undervoltage and overvoltage conditions at the power sup- ply input. The UV and OV pins are internally connected to analog ...
Page 12
LT4250L/LT4250H APPLICATIONS INFORMATION –48V RTN (SHORT PIN) –48V RTN * –48V * DIODES INC. SMAT70A –48V RTN (SHORT PIN) –48V RTN 549k 6.49k * –48V * DIODES INC. SMAT70A LT4250L DD PWRGD R4 GATE + 3 UV ...
Page 13
... MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm) Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...
Page 14
... UV/0V Pins, Power-Good Output www.linear.com ● LUCENT JW050A1 OUT 8 + SENSE + 2 7 ON/OFF TRIM + C5 C6 100μF 0.1μF 6 – SENSE 100V 100V 4 5 – – OUT CASE 3 4250 F15 LT 0309 REV A • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2001 5V C7 100μF 16V 4250lhfa ...