RT9711AGB from Richtek Tech, 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	FLG	output	Open-drain fault flag output. Asserts low (typ. 20 Ω pull-down, IFLG_OFF ≤ 1 μA leakage when off) after a 12 ms (typ.) delay when an over-current, thermal-shutdown, or reverse-current fault is detected. Requires an external 10 kΩ-100 kΩ pull-up resistor to the USB controller supply. Absolute-max flag voltage 6.5 V.
2	GND	power_in	Device ground / return for the internal high-side switch, charge pump, bias, and logic. Tie to the system ground plane close to the CIN and COUT return paths.
3	EN	input	Chip enable input (active-high on the RT9711A variant). Logic-high (VIH ≥ 2.0 V) turns the internal N-MOSFET switch on; logic-low (VIL ≤ 0.8 V) turns it off. Input range 0 V to 5.5 V, input leakage 0.01 μA typ. Must never be left floating. When disabled the pin is pulled low internally through ~75 Ω (RDS shutdown).
4	VIN	power_in	Power input to the internal high-side N-MOSFET switch and to the internal bias/charge-pump/UVLO circuitry. Recommended operating range 2.5 V to 5.5 V (absolute max 6.5 V). Decouple locally with a 1 μF CIN capacitor to GND. UVLO releases at ~1.7 V rising.
5	VOUT	power_out	Switched power output (drain of the internal N-MOSFET) to the downstream USB port/load. Delivers up to 1.5 A continuous (current limit ILIM = 2.5 A typ., 1.6-3.2 A). RDS(on) 80 mΩ typ. at VIN = 5 V, IOUT = 1 A. A low-ESR ≥150 μF aluminum/tantalum bulk capacitor plus a 10 μF ceramic to GND is recommended to meet the USB VBUS 330 mV droop requirement. Can be forced higher than VIN when off (no body diode).

Key specifications

Parameter	Value
Manufacturer	Richtek Tech
Package	SOT-23-5
Category	PMIC
Pins	5

Ordering variants

Same part, different packaging or reel option.

RT9711AGB
RT9711AGBAPB
RT9711AGBBGB
RT9711AGBBPB
RT9711AGBCGB
RT9711AGBCPB
RT9711AGBDGB
RT9711AGBDPB
RT9711AGBG
RT9711AGBAPBG
RT9711AGBBGBG
RT9711AGBBPBG
RT9711AGBCGBG
RT9711AGBCPBG
RT9711AGBDGBG
RT9711AGBDPBG
RT9711AGBAGJ5
RT9711AGBAPJ5
RT9711AGBBGJ5
RT9711AGBBPJ5
RT9711AGBCGJ5
RT9711AGBCPJ5
RT9711AGBDGJ5
RT9711AGBDPJ5
RT9711AGBAGS
RT9711AGBAPS
RT9711AGBBGS
RT9711AGBBPS
RT9711AGBCGS
RT9711AGBCPS
RT9711AGBDGS
RT9711AGBDPS
RT9711AGBAGF
RT9711AGBAPF
RT9711AGBBGF
RT9711AGBBPF
RT9711AGBCGF
RT9711AGBCPF
RT9711AGBDGF
RT9711AGBDPF

CAD (KiCad official)

Symbol: RT9711AGB
Footprint: Package_TO_SOT_SMD:SOT-23-5
3D model: SOT-23-5 (KiCad packages3D, STEP)

3D model downloads

Two STEP files. Same geometry, different body top:

File	Size	Use it when
`rt9711agb.step`	85 KB	You want the bare part, or you mark your own boards.
`rt9711agb-etched.step`	1.5 MB	You want the part with `RT9711AGB` already on it.

The marking in the etched file is real recessed geometry cut into the solid, not a texture or a decal: 392 faces against 102 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: Richtek Tech datasheet (17 pp, sha256 fe8722ee5da59baf, 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