UC2843M

@@ -0,0 +1,49 @@+# UC2843M++**HGSEMI** · AC-DC Controllers and Regulators · SOP-8++UC2843M from HGSEMI, in a SOP-8. 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 | COMP | output | Error Amplifier output, brought out for loop compensation. External RC networks between COMP and VFB set the control-loop response. |+| 2 | VFB | input | Inverting input of the Error Amplifier (internal reference ~2.5V). Normally connected to the switching supply output through a resistor divider for output-voltage regulation. |+| 3 | ISENSE | input | Current-sense input. A voltage proportional to the switch/inductor current (from a sense resistor) is applied here; the PWM comparator terminates the output switch conduction when this pin reaches ~1.0V (internal 1V clamp). |+| 4 | RT/CT | passive | Oscillator timing pin. Oscillator frequency and maximum duty cycle are set by an external resistor RT from VREF to this pin, and a capacitor CT from this pin to GND. Typical operation up to 500 kHz. |+| 5 | GND | power_in | Combined control-circuitry and power ground return for the IC. Single-point ground for both signal path and the totem-pole output stage. |+| 6 | OUT | output | High-current totem-pole gate-drive output. Directly drives the gate of an external power MOSFET; peak source/sink currents up to 1 A. VOH ~13.5V and VOL ~0.08V at 20 mA. |+| 7 | VCC | power_in | Positive supply for the IC. Absolute max 30V (or Zener-clamped ~38V). UC2843/45 UVLO turn-on ~8.4V, turn-off ~7.6V; operating ICC ~13 mA, startup ~0.17 mA. |+| 8 | VREF | power_out | 5.0V (±2%) trimmed reference output. Sources bias/charging current for the timing capacitor CT via RT; short-circuit current limited to ~-100 mA (typ). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | HGSEMI |+| Package | SOP-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `UC2843MM`+- `UC2843MM/TR`+- `UC2843MN`++## CAD (KiCad official)++- Symbol: `UC2843M`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [HGSEMI datasheet](docs/uc2843m-datasheet.pdf) (12 pp, sha256 `b372c24e6b8779f6`, 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/uc2843m-datasheet.pdf)

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