UC3844BD1R2G

@@ -0,0 +1,54 @@+# UC3844BD1R2G++**onsemi** · AC-DC Controllers and Regulators · SOIC-8-150mil++UC3844BD1R2G from onsemi, in a SOIC-8-150mil. 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 | Compensation | output | Error-amplifier output / loop compensation node. Available for external loop-compensation networks connected to the Voltage Feedback pin. Also drives the internal current-sense comparator through a 2 V level shift and 1/3 divider. |+| 2 | Voltage Feedback | input | Inverting input of the error amplifier. Normally connected to the switching-power-supply output through a resistor divider; internally referenced to 2.5 V. Input bias current typically -0.1 uA. |+| 3 | Current Sense | input | Current-sense comparator input. A voltage proportional to primary switch current (via a ground-referenced sense resistor) is applied here. Trips PWM latch when it reaches 1.0 V (typ) scaled from the compensation pin; input range -0.3 to +5.5 V. |+| 4 | RT/CT | passive | Oscillator timing pin. An external resistor to Vref and capacitor to GND set the oscillator frequency (fOSC ~ 1.72/(RT*CT) for RT > 5 k) and output deadtime. Guaranteed to 250 kHz; usable to 500 kHz output switching frequency. |+| 5 | GND | power_in | Device ground (control and power ground shared in the 8-pin package). Return for all internal circuitry and the totem-pole output stage. |+| 6 | Output | output | High-current totem-pole output for driving a power MOSFET gate directly. Rated for 1.0 A source/sink peak; typical rise/fall time 50 ns with 1 nF load. Duty cycle limited to 50% max (UC3844B/UC2844B). |+| 7 | VCC | power_in | Positive supply for control logic and output driver. UVLO on/off thresholds 16 V / 10 V (UC3844B). Absolute maximum 36 V; internal zener clamp at ~36 V (IZ up to 25 mA). Startup current ~0.5 mA, operating ~17 mA. |+| 8 | Vref | power_out | 5.0 V trimmed reference output (+/-1% at 25 C). Sources up to 20 mA for external circuitry and the oscillator timing resistor; short-circuit current typically -85 mA. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | onsemi |+| Package | SOIC-8-150mil |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `UC3844BD1R2GD1`+- `UC3844BD1R2GD1R2G`+- `UC3844BD1R2GD1G`+- `UC3844BD1R2GN`+- `UC3844BD1R2GNG`+- `UC3844BD1R2GD`+- `UC3844BD1R2GDR2G`+- `UC3844BD1R2GDG`++## CAD (KiCad official)++- Symbol: `UC3844BD1R2G`+- Footprint: `Package_SO:SOIC-8_3.9x4.9mm_P1.27mm`+- 3D model: SOIC-8-150mil (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/uc3844bd1r2-d.pdf) (19 pp, sha256 `e69ff39fc0ea9e08`, 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](docs/uc3844bd1r2g-datasheet.pdf)

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