Wide Vin 50V Non-synchronous Boost/Flyback/SEPIC Controller, SCT81623 Replace LM51561.
FEATURES

• Qualified for Automotive Applications

• Wide Input Voltage Range: 3.1V-50V
• Low Shutdown Current 3.9uA
• Low Quiescent Operating Current: 540uA
• +/- 1.5% Feedback Reference Voltage
• Adjustable Switching Frequency: 100KHz to
  2.2MHz
• Integrated Frequency Dither for EMI Mitigation
• External Frequency Synchronic
• External Compensation
• Pulse Skipping Mode
• Supports additional Slope Compensation
• Adjustable Soft-start Time
• Power Good Indicator
• Integrated Protection Feature
  - Constant Peak-Current Protection Threshold
    Over Input Voltage
  - Output Overvoltage Protection
  - Adjustable Under-voltage Lockout
  - Hiccup Over Load Protection
  - Thermal Shutdown Protection:165°C
• TQFN-12L(2mm*3mm)






















PIN CONFIGUTION
CROSS
LM51561 LM51561.pdf

No.14556

FEATURES

• 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 (IQ ≤ 2.6 μA)

• Low operating current (IQ ≤ 490 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 optocoupler (flyback)

• 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

• ±1% accuracy feedback reference

• Supports additional slope compensation

• Programmable soft start

• PGOOD indicator

• Create a custom design using the LM5156x with

  the WEBENCH® power designer

PIN CONFIGUTION
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