LT1424-9 Datasheet | Linear Technology

LT1424-9 Isolated Flyback Switching Regulator with 9V Output Features s s DESCRIPTIO s s s s s No Transformer “Third Winding” or Optoisolator Required Application Circuit Meets PCMCIA Type II Height Requirement Fixed, Application Specific 9V Output Voltage Regulation Maintained Well into Discontinuous Mode (Light Load) Load pensation Provides Excellent Load Regulation Available in 8-Pin PDIP and SO Packages Operating Frequency: 285k Hz The LT ®1424-9 is a monolithic high power switching regulator specifically designed for the isolated flyback topology. No “third winding” or optoisolator is required; the integrated circuit senses the isolated output voltage directly from the primary side flyback waveform. A high current, high efficiency switch is included on the die along with all oscillator, control and protection circuitry. The LT1424-9 operates with input supply voltages from 3V to 20V and draws only 7m A quiescent current. It can deliver up to 200m A at 9V with no external power devices. By utilizing current mode switching techniques, it provides excellent AC and DC line regulation. The LT1424-9 has a number of Features not found on other switching regulator ICs. Its unique control circuitry can maintain regulation well into discontinuous mode. Load pensation circuitry allows for improved load regulation. An externally activated shutdown mode reduces total supply current to 20µA typical for standby operation. , LTC and LT are registered trademarks of Linear Technology Corporation. U APPLICATIO S s Ethernet Isolated 5V to - 9V Converter TYPICAL APPLICATIO - 9V PCMCIA Type II Isolated LAN Supply (2.41mm Maximum ponent Height) ISOLATION BARRIER 5V C1 10µF 25V C2 10µF 25V 0.1µF LT1424-9 2 1 100k 47p F 1000p F INPUT 3 4 VC SHDN SYNC SGND RCP VIN VSW PGND 8 7 6 5 0.1µF D1 1N5248 C5 220p F D2 MBR0540T4 2 1:1 R1 75Ω 1 MBRS130LT3 OUT 3 T1 4 1424 TA01 C1, C2, C3, C4: MARCON THCS50E1E106Z CERAMIC CAPACITOR, SIZE 1812. (847) 696-2000 T1:...