LP3321B6F from LOWPOWER, in a SOT-23-6. Pinout and pin descriptions extracted from the manufacturer datasheet by ds2sf; symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	LX	output	Output switching node (drain of the internal 1.5A N-MOSFET). Connects to the boost inductor and Schottky diode. Absolute max -0.3V to 46V; internal RDS(on) ~400 mOhm; 1.0MHz switching.
2	GND	power_in	Device ground. Must be connected to a strong ground plane for heat sinking and noise protection.
3	FB	input	Feedback reference voltage pin. Connect a current-sense resistor between the LED string cathode and GND; the internal reference regulates this pin to 200mV (ILED = 200mV / R1). Feedback input current ~50nA. Abs max -0.3V to 46V.
4	EN	input	Chip enable (active high) and PWM dimming input. High impedance; requires a ~100k pull-down to GND when the control signal may be floating. VIL <= 0.4V, VIH >= 1.4V. Accepts PWM dimming from 200Hz to 200kHz (down to 1% duty cycle with PWM < 50kHz).
5	NC	unconnected	No connect. Leave floating or tie to GND per layout preference.
6	VIN	power_in	Supply input voltage pin, 2.5V to 5.5V operating range (abs max 6.5V). Bypass with a 1uF (or 10uF as shown in the typical application) ceramic capacitor close to the pin to reduce input noise. UVLO ~2.3V with 0.25V hysteresis.

Key specifications

Parameter	Value
Manufacturer	LOWPOWER
Package	SOT-23-6
Category	LED-drv
Pins	6

Ordering variants

Same part, different packaging or reel option.

LP3321B6F
LP3321B6FQVF

CAD (KiCad official)

Symbol: LP3321B6F
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`lp3321b6f.step`	97 KB	You want the bare part, or you mark your own boards.
`lp3321b6f-etched.step`	2.0 MB	You want the part with `LP3321B6F` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 476 faces against 117 in the bare model. It survives export, section views, and rendering in any CAD tool, and it drops straight into KiCad or Fusion with no extra setup.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: LOWPOWER datasheet (9 pp, sha256 86792229b56b7ee6, retrieved 2026-08-17, tier: lcsc)
Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF