The LM5143-Q1 is a 65-V
synchronous buck DC/DC controller for high-current single or dual
outputs. The device uses an interleaved, stackable, peak
current-mode control architecture for easy loop compensation, fast
transient response, excellent load and line regulation, and accurate
current sharing with paralleled phases for higher output current. A
high-side switch minimum on-time of 65 ns gives large step-down
ratios, enabling the direct conversion from 12-V, 24-V,
or 48-Vautomotive inputs to low-voltage rails for reduced
system complexity and solution cost. The LM5143-Q1 continues to
operate during input voltage dips as low as 3.5 V, at nearly 100%
duty cycle if needed.
Current is sensed using
the inductor DCR for highest efficiency or an optional shunt
resistor for high accuracy. The 15-µA no-load quiescent current with
the output voltage in regulation extends operating run-time in
battery-powered systems. Power the LM5143-Q1 from the output of the switching regulator
or another available source for even lower input quiescent current
and power loss.
The LM5143-Q1 is a 65-V
synchronous buck DC/DC controller for high-current single or dual
outputs. The device uses an interleaved, stackable, peak
current-mode control architecture for easy loop compensation, fast
transient response, excellent load and line regulation, and accurate
current sharing with paralleled phases for higher output current. A
high-side switch minimum on-time of 65 ns gives large step-down
ratios, enabling the direct conversion from 12-V, 24-V,
or 48-Vautomotive inputs to low-voltage rails for reduced
system complexity and solution cost. The LM5143-Q1 continues to
operate during input voltage dips as low as 3.5 V, at nearly 100%
duty cycle if needed.
Current is sensed using
the inductor DCR for highest efficiency or an optional shunt
resistor for high accuracy. The 15-µA no-load quiescent current with
the output voltage in regulation extends operating run-time in
battery-powered systems. Power the LM5143-Q1 from the output of the switching regulator
or another available source for even lower input quiescent current
and power loss.