LM5156-Q1

• AEC-Q100 qualified for automotive applications
  • Temperature grade 1: –40°C to +125°C T_A
• Functional Safety-Capable
  • Documentation available to aid functional safety system design
• Suited for wide input operating range car 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
  • 12-Pin WSON package (3 mm × 2 mm) with wettable flanks
  • Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
  • Minimized undershoot during cranking (start-stop application)
• EMI mitigation
  • Selectable dual random spread spectrum
  • Lead-less package
• 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
• Create a custom design using the LM5156x-Q1 with the WEBENCH^® power designer

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The LM5156x-Q1 (LM5156-Q1 and LM51561-Q1) 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 LM5156x-Q1 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.

The internal VCC regulator also supports BIAS pin operation up to 60 V (65-V absolute maximum) for automotive load dump. The switching frequency is dynamically programmable with an external resistor from 100 kHz to 2.2 MHz. Switching at 2.2 MHz minimizes AM band interference and allows for a small solution size and fast transient response. To reduce the EMI of the power supply, the device provides a selectable dual random spread spectrum which reduces the EMI over the wide frequency range.

The device features a 1.5-A standard MOSFET driver and a low 100-mV current limit threshold. The device also supports the use of an external VCC supply to improve efficiency. Low operating current and pulse-skipping operation improve efficiency at light loads.

The device has built-in protection features such as cycle-by-cycle current limit, overvoltage protection, line UVLO, and thermal shutdown. Hiccup mode overload protection is available in the LM51561-Q1 device option. Additional features include low shutdown I_Q, programmable soft start, programmable slope compensation, precision reference, power-good indicator, and external clock synchronization.