AP5101SG-13 from Diodes Incorporated, 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	SW	output	Switch Output. Drain of the internal high-side power MOSFET; connect to the inductor and Schottky rectifier. This node also serves as the reference for the floating top gate driver via the BST bootstrap capacitor. Switches between GND and VIN at 1.4MHz.
2	IN	power_in	Supply Voltage input, 4.75V to 22V (26V absolute max). A local decoupling capacitor (typ. 10uF ceramic) must be placed close to this pin to prevent input voltage spikes.
3	EN	input	On/Off Control Input. Pull above 1.2V to enable the converter; pull below 0.4V to shut down (0.1uA typical shutdown current). Must not be left floating; tie to VIN through a 100kΩ resistor if unused. Absolute max 6V.
4	GND	power_in	Ground. Voltage reference for the regulated output. Route outside of the D1-to-C1 ground path to prevent switching-current spikes from injecting noise into the part.
5	FB	input	Feedback input to the internal error amplifier (0.810V reference). Connect to an external resistor divider from VOUT (or directly to VOUT for 0.81V output). When VFB falls below 400mV the frequency-foldback comparator drops the oscillator to ~500kHz to prevent current-limit runaway.
6	COMP	output	Loop-compensation node; output of the internal transconductance error amplifier (GEA ≈ 850 µA/V). Connect a series R-C network from COMP to GND to set the crossover frequency and phase margin.
7	BST	power_in	Bootstrap supply for the high-side gate driver. Connect a capacitor (typ. 10nF, range 0.1uF to 100uF per DS) from BST to SW to form a floating supply that drives the internal power MOSFET gate above VIN. An external bootstrap diode from a 5V rail to BST is recommended when VIN ≤ 5V. Absolute max VSW + 6V.
8	GND	power_in	Ground return for all internal control circuitry; reference for the regulated output. Tie together with pin 4 on the PCB with careful layout.

Key specifications

Parameter	Value
Manufacturer	Diodes Incorporated
Package	SOIC-8
Category	PMIC
Pins	8

Ordering variants

Same part, different packaging or reel option.

AP5101SG-13

CAD (KiCad official)

Symbol: AP5101SG-13
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: Diodes Incorporated datasheet (None pp, sha256 aea17126126fb878, 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