HV9910BLG-G from Microchip, in a SOIC-8. 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	power_in	Input to the internal 8.0-450V linear regulator that supplies VDD. Absolute maximum 470V to GND; typical operating range 8.0-450V DC.
2	CS	input	Current sense input. Senses the external FET current across a sense resistor RCS; when this pin exceeds the lower of the internal 250mV reference or the LD pin voltage, GATE goes low. Blanking interval 150-280ns.
3	GND	power_in	Ground return for all internal circuitry. Must be electrically connected to the ground of the power train.
4	GATE	output	Output gate driver for an external N-channel power MOSFET. Sourcing/sinking capability 165mA, rise/fall time 30-50ns into 500pF at VDD=7.5V.
5	PWMD	input	PWM dimming input. When pulled to GND, the GATE driver is disabled; when pulled high (>=2.0V), GATE operates normally. Internal pull-down of 50-150kΩ. Tie to VDD to disable PWM dimming.
6	VDD	power_out	Internally regulated 7.5V supply for all internal circuits. Must be bypassed with a low-ESR capacitor (>=0.1µF) to GND. Can be externally driven above the internal regulator voltage but must not exceed 12V.
7	LD	input	Linear dimming input. Sets the current-sense threshold when the pin voltage is less than 250mV (typ); tie to VDD to use the internal 250mV reference. Accepts a 0-250mV analog control signal for LED current adjustment.
8	RT	passive	Oscillator timing resistor pin. Resistor from RT to GND sets constant-frequency operation; resistor from RT to GATE sets constant off-time mode. tOSC(µs) = (RT(kΩ)+22)/25.

Key specifications

Parameter	Value
Manufacturer	Microchip
Package	SOIC-8
Category	LED-drv
Pins	8

Ordering variants

Same part, different packaging or reel option.

HV9910BLG-G
HV9910BLG-GNG-G

CAD (KiCad official)

Symbol: HV9910BLG-G
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`hv9910blg-g.step`	122 KB	You want the bare part, or you mark your own boards.
`hv9910blg-g-etched.step`	2.2 MB	You want the part with `HV9910BLG-G` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 538 faces against 147 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: Microchip datasheet (15 pp, sha256 69b6d679b136d563, retrieved 2026-08-17, tier: manufacturer)
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