UC3844BD1013TR

@@ -0,0 +1,49 @@+# UC3844BD1013TR++**STMicroelectronics** · DC-DC Converters · SOIC-8++UC3844BD1013TR from STMicroelectronics, in a SOIC-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, made available for loop compensation. Typical output swing 0.8V (low) to 6.2V (high) with a 15k load to ground; capable of ~1mA source and up to 12mA sink. |+| 2 | VFB | input | Inverting input of the Error Amplifier. Normally connected to the switching power supply output through a resistor divider; internal reference at 2.5V. Input bias current typically -0.1uA. |+| 3 | ISENSE | input | Current sense input. A voltage proportional to inductor current is applied to this pin; the PWM comparator terminates output switch conduction when this voltage reaches ~1V. Peak current is set by Is_max = 1.0V / Rs. |+| 4 | RT/CT | passive | Oscillator timing pin. Frequency and maximum duty cycle are programmed by connecting timing resistor RT to VREF and timing capacitor CT to ground. Operation up to 500kHz is possible. |+| 5 | GROUND | power_in | Combined control circuitry and power ground return. All voltages are referenced to this pin. |+| 6 | OUTPUT | output | Totem-pole gate-drive output for the external power MOSFET. Peak sourcing and sinking currents up to 1A; low in the off-state and during UVLO. Typical rise/fall time 50ns into 1nF load. |+| 7 | VCC | power_in | Positive supply of the control IC (Vi). UVLO turn-on at 16V typ, turn-off at 10V typ (UC3844B). Absolute max 30V (self-limiting Zener at ~36V). Start-up current <0.5mA; operating current ~12mA typ. |+| 8 | VREF | power_out | Internally trimmed 5.0V reference output (4.90 to 5.10V). Provides charging current for CT through RT; capable of supplying up to 50mA to external circuitry. Short-circuit current typically -100mA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | STMicroelectronics |+| Package | SOIC-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `UC3844BD1013TRBD1`+- `UC3844BD1013TRBD1013TR`+- `UC3844BD1013TRBN`++## CAD (KiCad official)++- Symbol: `UC3844BD1013TR`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [STMicroelectronics datasheet](docs/uc3844bd1013tr-datasheet.pdf) (15 pp, sha256 `fc57b1768120cd82`, 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/uc3844bd1013tr-datasheet.pdf)

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