RT8575GQW from Richtek Tech, in a DFN-16-EP(5x5). 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	CH1	input	Current sink for LED string 1. Connect to bottom cathode of LED string. Absolute max 66V. Connect to GND if channel is unused (auto-disabled during startup).
2	CH2	input	Current sink for LED string 2. Connect to bottom cathode of LED string. Absolute max 66V. Connect to GND if channel is unused.
3	CH3	input	Current sink for LED string 3. Connect to bottom cathode of LED string. Absolute max 66V. Connect to GND if channel is unused.
4	CH4	input	Current sink for LED string 4. Connect to bottom cathode of LED string. Absolute max 66V. Connect to GND if channel is unused.
5	AGND	power_in	Analog ground. Return for internal analog reference and control circuitry.
6	ISET	input	LED current setting. Connect resistor RISET from ISET to GND to program per-channel LED current (50-150mA). VISET is typically 1V. Do not short to GND.
7	COMP	passive	Error amplifier compensation node for the boost loop. Connect an R-C compensation network to ground.
8	RT	input	Switching frequency selection input. Resistor from RT to GND sets the boost switching frequency, adjustable 150kHz to 500kHz.
9	PWM	input	PWM dimming control input. Accepts input dimming frequency 120Hz to 1kHz for LED brightness modulation without inrush current.
10	EN	input	Chip enable, active high. High-impedance input; add a 100kΩ pull-down to GND when the control signal source can float. Absolute max 44V.
11	VIN	power_in	Power supply input. Operating range 4.2V to 24V; absolute max 44V. Bypass with local CIN capacitors to PGND.
12	LX	power_out	Switching node of the internal 60V, 150mΩ boost power switch. Connect to boost inductor and Schottky rectifier. Absolute max 66V. Tie in parallel with pin 13.
13	LX	power_out	Switching node of the internal boost power switch (paralleled with pin 12). Connect to boost inductor and Schottky rectifier.
14	PGND	power_in	Power ground of the boost converter. Tie together with pins 15 and 17 (exposed pad) to a large PCB copper area for maximum power dissipation.
15	PGND	power_in	Power ground of the boost converter. Tie together with pins 14 and 17 (exposed pad).
16	OVP	input	Over-voltage protection sense input for the boost converter. Detection threshold is typically 1.2V; set via resistor divider from VOUT.
17	PGND	power_in	Exposed thermal pad. Power ground of the boost converter. Must be soldered to a large PCB copper area and tied to PGND (pins 14/15) for thermal and electrical performance.

Key specifications

Parameter	Value
Manufacturer	Richtek Tech
Package	DFN-16-EP(5x5)
Category	LED Drivers
Pins	17

Ordering variants

Same part, different packaging or reel option.

RT8575GQW
RT8575GQWGN

CAD (KiCad official)

Symbol: RT8575GQW
Footprint: Package_DFN_QFN:DFN-16-1EP_5x5mm_P0.5mm_EP3.46x4mm
3D model: DFN-16-EP(5x5) (KiCad packages3D, STEP)

Provenance

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

Datasheet: Richtek Tech datasheet (None pp, sha256 9d811c6a0ca1bf5d, 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