LM51561H

• Functional Safety-Capable
  • Documentation available to aid functional safety system design
• Suited for wide input operating range battery applications
  • 3.5-V to 60-V Operating range (65-V abs max)
  • 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 65 V
  • Minimized battery drain
    • Low shutdown current ( I_Q ≤ 2.6 µA )
    • Low operating current ( I_Q ≤ 490 µA )
• Small solution size and low cost
  • Maximum switching frequency of 2.2 MHz
  • Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
• EMI mitigation
  • Selectable dual random spread spectrum
• Higher efficiency with low-power dissipation
  • 100-mV ±7% accurate current limit threshold
  • Strong 1.5-A peak standard MOSFET driver
  • Supports external VCC supply
• Avoid AM band interference and crosstalk
  • Optional clock synchronization
  • Dynamically programmable switching frequency from 100 kHz to 2.2 MHz
• Integrated protection features
  • Constant peak current limiting over input voltage
  • Optional hiccup mode overload protection (see the Device Comparison Table)
  • Programmable line UVLO
  • OVP protection
  • Thermal shutdown
• Accurate ±1% accuracy feedback reference
• Programmable extra slope compensation
• Adjustable soft start
• PGOOD indicator
• 14-Pin HTSSOP package (5.0 mm × 4.4 mm)
• Create a custom design using the LM5156xH with the WEBENCH power designer

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The LM5156xH (LM5156H and LM51561H) 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 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 voltage as low as 1.5 V if the BIAS pin is greater than 3.5 V.