LM5157 2.2-MHz Wide V_IN 50-V Boost/SEPIC/Flyback Converter with Dual Random Spread Spectrum

1 Features

Suited for wide operating range for battery applications
- 2.9-V to 45-V input operating range
- 48-V maximum output (50-V abs max)
- Minimum boost supply voltage of 1.5 V when BIAS ≥ 2.9 V
- Input transient protection up to 50 V
- Minimized battery drain
  - Low shutdown current (I_Q ≤ 2.6 µA)
  - Low operating current (I_Q ≤ 670 µA)
Small solution size and low cost
- Maximum switching frequency up to 2.2 MHz
- 16-pin QFN package (3 mm × 3 mm)
- Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
- Accurate current limit (see the Device Comparison Table)
EMI mitigation
- Selectable dual random spread spectrum
- Lead-less package
Higher efficiency with low-power dissipation
- 45-mΩ R_DSON switch
- Fast switching, small switching loss
Avoid AM band interference and crosstalk
- Optional clock synchronization
- Dynamically programmable wide switching frequency from 100 kHz to 2.2 MHz
Integrated protection features
- Constant current limiting over input voltage
- Selectable hiccup mode overload protection
- Programmable line UVLO
- OVP protection
- Thermal shutdown
Accurate ±1% accuracy feedback reference
Adjustable soft start
PGOOD indicator
Create a custom design using the LM5157x with the WEBENCH® Power Designer