LM51551 - Texas Instruments

LM51551 2.2-MHz Wide Input Nonsynchronous Boost Flyback Controller

The LM5155x ( LM5155 and LM51551 ) device is a wide input range, non-synchronous boost controller that uses peak current mode control. The device can be used in boost, SEPIC, and flyback topologies. The LM5155x device can start up from a 1-cell battery with a minimum of 2.97 V if the BIAS pin is connected to the VCC pin. It can operate with the input supply .

Features

•1 Functional safety capable
  – Documentation available to aid functional safety system design
• Wide Input Operating Range for Battery Applications
  – 3.5-V to 45-V Operating Range
  – 2.97-V to 16-V When BIAS = VCC
  – Minimum Boost Supply Voltage 1.5 V When BIAS ≥ 3.5 V
  – Input Transient Protection up to 50 V
• Minimized Battery Drain
  – Low Shutdown Current ( IQ ≤ 2.6 µA )
  – Low Operating Current ( IQ ≤ 480 µA )
• Small Solution Size and Low Cost
  – Maximum Switching Frequency of 2.2 MHz
  – 12-Pin WSON Package (3 mm × 2 mm)
  – Integrated Error Amplifier Allows Primary-Side Regulation Without Optocou.