The LM5007 0.5-A 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
80-V, 0.7-A N-channel buck switch and operates over an input voltage range of 9 V to 75 V. The
device is easy to implement and is provided in 8-pin VSSOP and 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 with load and input voltage variations. The hysteretic control requires no loop
compensation and provides fast transient response. An intelligent current limit is implemented with
forced off-time that is inversely proportional to VOUT. This current
limiting scheme ensures short-circuit protection while providing reduced load current foldback.
Other protection features include thermal shutdown with automatic recovery,
VCC and gate drive undervoltage lockout, and maximum duty cycle
limiter.
