The LM5008 350-mA step-down switching converter features all of the functions needed to
implement a low-cost and efficient buck regulator. This high-voltage converter has an integrated
100-V N-channel buck switch and operates over an input voltage range of 9 V to 95 V. The device is
easy to implement and is provided in the 8-pin VSSOP and the thermally enhanced 8-pin WSON
packages. The converter uses a hysteretic control scheme with a PWM on-time inversely proportional
to VIN. This feature allows the operating frequency to remain relatively
constant. The hysteretic control requires no loop compensation. An intelligent current limit is
implemented with forced off-time, which is inversely proportional to VOUT.
This scheme ensures short-circuit protection while providing minimum foldback. Other protection
features include: thermal shutdown, VCC undervoltage lockout, gate drive
undervoltage lockout, and maximum duty cycle limiter.
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