CJ6211B28M from Changjing, in a SOT-23-5L. 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	VIN	power_in	Unregulated power input. Operating range 1.8 V to 6.0 V, absolute max 7 V. Bypass with a 1 µF ceramic CIN to VSS close to the pin.
2	VSS	power_in	Ground / negative supply return for the regulator. All voltages are referenced to this network ground.
3	CE	input	TTL-logic chip-enable input, active high. VCE high threshold ≥1.5 V (up to VIN), VCE low ≤0.3 V. B-variant integrates a pull-down resistor so the part defaults off when CE floats; driving CE low enables the internal N-channel discharge FET across VOUT-VSS (≈60 Ω typ.).
4	NC	unconnected	No internal connection. Leave floating or tie to VSS on the board.
5	VOUT	power_out	Regulated output, 2.8 V for the '28' ordering code. Up to 700 mA (VOUT ≥ 1.8 V) / 500 mA (VOUT ≥ 0.8 V). Requires a 1 µF ceramic COUT to VSS; internal current limit and short-circuit protection to ~100 mA short current.

Key specifications

Parameter	Value
Manufacturer	Changjing
Package	SOT-23-5L
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

CJ6211B28MM
CJ6211B28MN
CJ6211B28MF

CAD (KiCad official)

Symbol: CJ6211B28M
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5L (KiCad packages3D, STEP)

Provenance

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

Datasheet: Changjing datasheet (11 pp, sha256 805289572b9842e1, 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