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40V Wide Vin Low-Side N-Channel Controller for Switching Regulators


Package | PIN: DGK | 8
Temp: Q (-40 to 125)
Carrier: Cut Tape
Qty Price
1-9 $2.31
10-24 $2.07
25-99 $1.92
100-249 $1.67
250-499 $1.54
500-749 $1.29
750-999 $1.06
1000+ $0.97


  • LM3478Q-Q1 is AEC-Q100 Qualified and Manufactured on an Automotive Grade Flow
  • 8-lead VSSOP-8
  • Internal Push-Pull Driver With 1-A Peak Current Capability
  • Current Limit and Thermal Shutdown
  • Frequency Compensation Optimized With a Capacitor and a Resistor
  • Internal Soft Start
  • Current Mode Operation
  • Undervoltage Lockout With Hysteresis
  • Create a Custom Design Using the LM3478 with the WEBENCH Power Designer

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Texas Instruments  LM3478QMMX/NOPB

The LM3478Q-Q1 is a versatile Low-Side N-Channel MOSFET controller for switchingregulators. It is suitable for use in topologies requiring a low side MOSFET, such as boost,flyback, SEPIC, etc. Moreover, the LM3478Q-Q1 can be operated at extremely high switching frequencyin order to reduce the overall solution size. The switching frequency of the LM3478Q-Q1 can beadjusted to any value between 100 kHz and 1 MHz by using a single external resistor. Current modecontrol provides superior bandwidth and transient response, besides cycle-by-cycle currentlimiting. Output current can be programmed with a single external resistor.

The LM3478Q-Q1 has built in features such as thermal shutdown, short-circuit protection,over voltage protection, etc. Power saving shutdown mode reduces the total supply current to 5 µAand allows power supply sequencing. Internal soft-start limits the inrush current atstart-up.