MCP16301T-I from Microchip, in a SOT-23-6. 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	passive	Bootstrap capacitor connection for the internal floating high-side N-channel MOSFET gate driver. An external CBOOST (typ. 100 nF) is tied between BOOST and SW; a boost-blocking diode (e.g. 1N4148) from VOUT charges CBOOST when SW is low. The BOOST-SW voltage must remain between 3.0 V and 5.5 V and is limited to 6.0 V absolute maximum.
2	GND	power_in	Device ground return for the analog control circuitry and the low side of the input capacitor. Must be connected to the system ground plane close to the input capacitor.
3	VFB	input	Feedback input to the internal error amplifier. Regulated to VREF = 0.800 V (0.784-0.816 V) via an external resistor divider from VOUT (RTOP to VOUT, RBOT to GND). Absolute maximum -0.5 V to 6.0 V; input bias ±10 nA typical.
4	EN	input	Enable input. Drive above VIH = 1.4 V to turn the regulator on (internal soft-start ~300 µs); drive below VIL = 0.4 V to place the device in shutdown (IQ ~7 µA). Absolute maximum -0.5 V to (VIN + 0.3 V); leakage 0.05 µA typ at VEN = 12 V.
5	VIN	power_in	Input supply. 4.7 V to 36 V for the MCP16301H (4.0 V to 30 V for the MCP16301). UVLO turns the device on at ~3.5 V rising and off at ~3.0 V falling. Bypass to GND with a low-ESR ceramic input capacitor (10 µF typical) close to the pin. Absolute maximum 40 V referenced to SW.
6	SW	output	Switch node - source of the integrated high-side N-channel MOSFET and cathode of the external freewheeling Schottky diode. Connect to the external inductor and the low side of the boost capacitor. Carries the chopped inductor current (up to 1.3 A peak current limit); route as a short, wide trace to minimize EMI.

Key specifications

Parameter	Value
Manufacturer	Microchip
Package	SOT-23-6
Category	PMIC
Pins	6

Ordering variants

Same part, different packaging or reel option.

MCP16301T-I/CHY
MCP16301HT-I/CHY

CAD (KiCad official)

Symbol: MCP16301T-I
Footprint: Package_TO_SOT_SMD:SOT-23-6
3D model: SOT-23-6 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`mcp16301t-i.step`	97 KB	You want the bare part, or you mark your own boards.
`mcp16301t-i-etched.step`	1.9 MB	You want the part with `MCP16301T-I` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 474 faces against 117 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 (40 pp, sha256 47e492312d19381e, 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