AP3429AKTTR-TP from TECH PUBLIC, in a SOT-23-5. 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	EN	input	Enable input. Drive high (>=1.5 V) to turn the converter on, low (<=0.4 V) to shut it down. Pin has an internal ~1100 kΩ pull-down to GND.
2	GND	power_in	Power ground pin. Return for both the internal power MOSFETs and control circuitry.
3	SW	power_out	Switching node (also labeled LX on the pin diagram). Connect this pin to the external inductor; internal high-side and low-side MOSFETs switch this node between VIN and GND.
4	VIN	power_in	Power input pin, 2.7 V to 5.5 V. Bypass with a ceramic capacitor (10 µF typical) close to the pin.
5	FB	input	Output voltage feedback pin. Connect to the midpoint of an external resistor divider from VOUT to GND; internal reference is 0.6 V (0.591 V - 0.609 V).

Key specifications

Parameter	Value
Manufacturer	TECH PUBLIC
Package	SOT-23-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

AP3429AKTTR-TP

CAD (KiCad official)

Symbol: AP3429AKTTR-TP
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

Provenance

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

Datasheet: TECH PUBLIC datasheet (5 pp, sha256 40c74d6292c6f140, 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