The LM5008A DC/DC converter is a functional variant of the LM5008 COT Buck Switching
Regulator. The functional differences of the LM5008A are: the minimum input operating voltage is 6
V, the on-time equation is slightly different, and the requirement for a minimum load current is
The LM5008A 350-mA step-down switching regulator features all of the functions required
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 6 V to 95 V. The device is
easy to implement and is provided in 8-pin VSSOP and the thermally enhanced 8-pin WSON packages.
The converter uses PWM control scheme with an on-time inversely proportional to
VIN. This feature allows the operating frequency to remain relatively
constant. The control scheme 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 control while providing minimum foldback. Other features include:
thermal shutdown, VCC undervoltage lockout, gate drive undervoltage lockout,
maximum duty cycle limiter, and a pre-charge switch.
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