with 9V Output
s No Transformer “Third Winding” or Optoisolator
s Application Circuit Meets PCMCIA Type II
s Fixed, Application Specific 9V Output Voltage
s Regulation Maintained Well into Discontinuous
Mode (Light Load)
s Load Compensation Provides Excellent
s Available in 8-Pin PDIP and SO Packages
s Operating Frequency: 285kHz
s Ethernet Isolated 5V to – 9V Converter
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 7mA quiescent current. It can
deliver up to 200mA at 9V with no external power devices.
By utilizing current mode switching techniques, it pro-
vides 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
compensation circuitry allows for improved load regula-
tion. 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.
– 9V PCMCIA Type II Isolated LAN Supply
(2.41mm Maximum Component Height)
D1 R1 MBRS130LT3
C3 C4 1.8k
1:1 1424 TA01
C1, C2, C3, C4: MARCON THCS50E1E106Z CERAMIC
CAPACITOR, SIZE 1812. (847) 696-2000
T1: COILTRONICS CTX02-13483