LD7575PS from Leadtrend Tech, 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	RT	input	Oscillator programming pin. Connect a resistor to GND to set the switching frequency (e.g. RT=100kΩ → ~65kHz typ). Recommended switching frequency range 50-130kHz.
2	COMP	input	Voltage feedback / compensation pin (equivalent to COMP pin of UC384X). Connect an opto-coupler to close the regulation loop. Open-loop voltage ~6.0V; green-mode threshold ~2.35V.
3	CS	input	Current sense input from the external MOSFET source resistor. Max input threshold 0.85V; internal leading-edge blanking ~350ns; input impedance ≥1MΩ.
4	GND	power_in	Device ground reference for all internal circuitry.
5	OUT	output	Gate drive output to the external power MOSFET. Totem-pole driver with up to 500mA sink/source; output high ≥9V, output low ≤1V at Io=20mA, VCC=15V.
6	VCC	power_in	Supply voltage pin. Recommended 11-25V; absolute max 30V. UVLO(on) ~16V, UVLO(off) ~10V, OVP trip ~27.5V. Bypass with 10-47µF.
7	NC	unconnected	Unconnected pin. Leave floating.
8	HV	power_in	High-voltage startup pin (rated up to 500V). Connect to the positive terminal of the bulk capacitor to provide ~1mA startup current to Vcc. Once Vcc trips UVLO(on) the HV current source is switched off to eliminate standby power loss.

Key specifications

Parameter	Value
Manufacturer	Leadtrend Tech
Package	SOIC-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

LD7575PS
LD7575PSPN

CAD (KiCad official)

Symbol: LD7575PS
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOIC-8 (KiCad packages3D, STEP)

Provenance

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

Datasheet: Leadtrend Tech datasheet (18 pp, sha256 52a54b667919e381, 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