# OB2273MP

**OB On Bright Elec** · AC-DC Controllers and Regulators · SOT-23-6

OB2273MP from OB On Bright Elec, 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 | GND | power_in | Ground return for the IC. All signal and power references are measured with respect to this pin. |
| 2 | FB | input | Feedback input pin. The PWM duty cycle is determined by the voltage level into this pin and the current-sense signal at Pin 4 (CS). Input impedance ~16 kOhm; open-loop VFB ≈ 4.2 V. Burst-mode thresholds ~1.175 V (enter) / 1.275 V (exit); power-limiting threshold ~3.7 V. |
| 3 | RT | bidirectional | Dual-function pin. Either connected through an NTC resistor to ground for over-temperature shutdown/latch control, or connected through a Zener to VDD for adjustable over-voltage protection. Sources ~100 uA (IRT); OTP threshold ~1 V; external OVP threshold ~4 V. |
| 4 | CS | input | Current-sense input for cycle-by-cycle peak-current control. Internal current-limit threshold ~0.75 V at zero duty cycle; CS clamp ~0.9 V; leading-edge blanking ~220 ns; input impedance ~40 kOhm. |
| 5 | VDD | power_in | Power supply pin. Recommended operating range 12-25 V; absolute max 30 V DC. UVLO(ON) ~9 V, UVLO(OFF) ~15.3 V. Startup current ~5 uA; operating current ~1.8 mA. Internal Zener clamp ~32 V (Vdd_clamp) and OVP ~28 V. |
| 6 | GATE | output | Totem-pole gate driver output for the external power MOSFET. Output clamp ~12 V; VOH ≥ 6 V @ 20 mA; VOL ≤ 1 V @ 5 mA. Rise/fall times ~175 ns / 85 ns into 1000 pF. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | OB On Bright Elec |
| Package | SOT-23-6 |
| Category | PMIC |
| Pins | 6 |

## Ordering variants

Same part, different packaging or reel option.

- `OB2273MP`
- `OB2273MPAP`

## CAD (KiCad official)

- Symbol: `OB2273MP`
- Footprint: `Package_TO_SOT_SMD:SOT-23-6`
- 3D model: SOT-23-6 (KiCad packages3D, STEP)
- 3D model files: `ob2273mp-etched.step` / `ob2273mp-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `ob2273mp.step` / `ob2273mp.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [OB On Bright Elec datasheet](docs/ob2273mp-datasheet.pdf) (12 pp, sha256 `1b0c18884f0cf7d9`, 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](docs/ob2273mp-datasheet.pdf)