XL7660 from XINLUDA, 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	BOOST	input	Frequency Boost input. Tying BOOST to V+ bypasses the internal divide-by-2 counter, raising the oscillator switching frequency (typ. 15 kHz vs 5 kHz at V+ = 5V) to reduce output impedance when smaller capacitors are used. Leave open for normal (divided) operation.
2	CAP+	passive	Positive terminal of the external charge-pump 'flying' capacitor C1 (typ. 10 µF electrolytic). Internally driven by the P-channel switch S1 and N-channel switch S2 that alternately connect this node to V+ and GND during each oscillator half-cycle.
3	GND	power_in	Device ground / 0 V reference. Substrate return for the internal switches S2 and S3 and for the external charge-pump / reservoir capacitors.
4	CAP-	passive	Negative terminal of the external charge-pump 'flying' capacitor C1. During the transfer half-cycle the internal N-channel switches S3/S4 shift C1's charge onto the reservoir capacitor C2 at VOUT. An external Schottky diode from VOUT to CAP- may be added to guarantee latch-up free operation in some applications.
5	VOUT	power_out	Negative charge-pump output. Delivers VOUT ≈ -V+ into an external reservoir capacitor C2 (typ. 10 µF). Output source resistance is typ. 55 Ω at V+ = 5V, IOUT = 20 mA. Can also be reconfigured externally as a voltage doubler output.
6	LV	input	Low-Voltage operation select. Tie LV to GND for supply voltages of 2.0 V to 3.5 V to bypass the internal series regulator and improve low-voltage performance. For V+ from 3.5 V to 10 V leave LV floating (open) to keep the regulator engaged and prevent latch-up. Absolute input range: -0.3 V to V+ + 0.3 V; ILV max 25 µA.
7	OSC	bidirectional	Oscillator node. Free-running with a nominal 10 kHz frequency at V+ = 5 V when left open (internal ~5 pF plus stray). Adding an external capacitor COSC to GND lowers fOSC; the pin may also be over-driven by an external clock. Input range: (V+ - 5.5 V) to (V+ + 0.3 V) when V+ > 5.5 V.
8	V+	power_in	Positive supply input, 2 V to 10 V operating range (absolute max +10.5 V). Powers the oscillator, level translator, internal regulator and the four MOS charge-pump switches. Typical quiescent supply current is 40 µA (no load) at 5 V.

Key specifications

Parameter	Value
Manufacturer	XINLUDA
Package	SOIC-8
Category	PMIC
Pins	8

CAD (KiCad official)

Symbol: XL7660
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
`xl7660.step`	122 KB	You want the bare part, or you mark your own boards.
`xl7660-etched.step`	1.4 MB	You want the part with `XL7660` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 353 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: XINLUDA datasheet (17 pp, sha256 80e0bc7d028cdd92, 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