Teacher gave me a schematic,and it includes a DC/DC buck converter with "LB" input and output,but i have no idea what the "LB" is,so i want to ask that does someone know what may the "LB" be?

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  • \$\begingroup\$ Neverrrr heard that used before but somewhere there is an inductor L in and out. \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Feb 28 '18 at 7:55
  • \$\begingroup\$ Oddly enuf, mechanical engineers use it to measure "buckling forces" in and out of plane and trump tweets how Buck trades IN to Canada gotta improve in NAFTA .. (lol) \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Feb 28 '18 at 7:59
  • \$\begingroup\$ Better ask prof to show a datasheet with this on it \$\endgroup\$ – Tony Stewart Sunnyskyguy EE75 Feb 28 '18 at 8:07
  • \$\begingroup\$ I agree it with you \$\endgroup\$ – Shine Sun Feb 28 '18 at 8:08

"LB" stands for "low battery". They are the input and output pins for a comparator and voltage reference (internal to the device) which can be wired to detect a low battery voltage and provide a shutdown signal.

For example, see this Linear Technology datasheet, page 4: http://cds.linear.com/docs/en/datasheet/126535fb.pdf

"LBOUT (Pin 3): Open-Drain Output of the Low-Battery Comparator. This pin will sink current when Pin 4 (LBIN) goes below 1.25V. During shutdown, this pin is high impedance.

LBIN (Pin 4): The (–) Input of the Low-Battery Comparator. The (+) input is connected to a reference voltage of 1.25V."

  • \$\begingroup\$ Thx,i will make sure it with my prof. tomorrow \$\endgroup\$ – Shine Sun Feb 28 '18 at 8:29

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