OB2009MP from OB On Bright Elec, 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	VIN	input	System output voltage detection input. High-voltage tolerant up to 150V. Used for self-supply from the system output to improve efficiency.
2	GND	power_in	Device ground reference.
3	SDT	input	Vds falling-edge slope-sensing threshold adjust. Sources ~20uA (ISDT). Threshold selectable: open = 150ns, tied to GND = 120ns, RSDT=50k = 180ns. If not otherwise stated, leave floating.
4	VDD	power_in	Power supply pin. Recommended operating range 5.5V to 6.5V. Internally regulated (typ 5.5V/6.5V depending on VIN). UVLO enter ~3.3V, exit ~3.6V. Bypass with 1uF cap to GND.
5	GATE	output	Gate driver output for external N-channel SR MOSFET. Typical 1A source / 3A sink capability. VOH ≥ 6V @ VDD=6.5V; VOL ≤ 0.5V. Absolute max -0.6V to 12V.
6	VD	input	Drain-sense input; connect to the external N-channel SR MOSFET drain (no more than 50 ohm series resistor recommended between VD and MOS drain). High-voltage tolerant up to 150V. SR turn-on threshold Vth_SR_act ≈ -200mV; adjustable turn-off threshold via series Rd (0.2*Rd mV).

Key specifications

Parameter	Value
Manufacturer	OB On Bright Elec
Package	SOT-23-6
Category	LED-drv
Pins	6

Ordering variants

Same part, different packaging or reel option.

OB2009MP

CAD (KiCad official)

Symbol: OB2009MP
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

Provenance

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

Datasheet: OB On Bright Elec datasheet (11 pp, sha256 32728c93f5588fe0, 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