LM3478MM Part Information

Details for LM3478MM by Texas Instruments

Electronic & Electrical Components > Semiconductors - ICs > Driver & Interface ICs

Part Description

The LM3478 is a versatile Low-Side N-Channel MOSFET controller for switching regulators. It is suitable for use in topologies requiring a low side MOSFET, such as boost, flyback, SEPIC, etc. Moreover, the LM3478 can be operated at extremely high switching frequency in order to reduce the overall solution size. The switching frequency of the LM3478 can be adjusted to any value between 100 kHz and 1 MHz by using a single external resistor. Current mode control provides superior bandwidth and transient response, besides cycle-by-cycle current limiting. Output current can be programmed with a single external resistor. The LM3478 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 µA and allows power supply sequencing. Internal soft-start limits the inrush current at start-up.

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Part Features

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

Part Specifications

Supply Voltage Min 2.97V
Supply Voltage Max 40V
Driver Case Style VSSOP
No. of Pins 8Pins
Operating Temperature Min -40°C
Operating Temperature Max 125°C
Product Range -
Automotive Qualification Standard -
RoHS Phthalates Compliant Yes
SVHC No SVHC (27-Jun-2018)
Base Number 3478
Controller IC Case Style MSOP
Controller Type PWM
Device Marking LM3478MM
Frequency 400kHz
Input Voltage 12V
Input Voltage Max 45V
Operating Temperature Range -40°C to +125°C
Output Current 200mA
Output Current Max 1A
Output Type Push Pull
Supply Voltage Range 2.97V to 40V
Termination Type Surface Mount Device
Voltage Regulator Type Switching
RoHS Compliant

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