UC3845BD1R2G

@@ -0,0 +1,54 @@+# UC3845BD1R2G++**onsemi** · AC-DC Controllers and Regulators · SOIC-8++UC3845BD1R2G from onsemi, 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 | Compensation | output | Error amplifier output / compensation node. External RC network to Voltage Feedback (pin 2) sets the closed-loop gain and frequency response of the error amplifier used for output regulation. |+| 2 | Voltage Feedback | input | Inverting input of the on-chip error amplifier. Normally connected to the switching power supply output through a resistor divider; the non-inverting input is internally tied to the 2.5 V reference (VFB regulation set point ~2.5 V). |+| 3 | Current Sense | input | Non-inverting input of the current-sense comparator. Monitors the MOSFET source current across a sense resistor; the internal PWM latch is reset (output terminates) when this pin reaches the threshold set by the error amp output (nominal max threshold 1.0 V). |+| 4 | RT/CT | passive | Oscillator timing pin. External resistor RT to Vref and timing capacitor CT to GND set the oscillator frequency (fOSC ≈ 1.72 / (RT·CT) for RT > 5 kΩ). Output switching frequency equals oscillator frequency. |+| 5 | GND | power_in | Device ground and current return for control circuitry and totem-pole output stage. In the SOIC-8/PDIP-8 package the signal and power grounds share this pin (the SOIC-14 D-suffix splits them). |+| 6 | Output | output | High-current totem-pole gate-drive output for the external power MOSFET. Capable of ±1 A peak source/sink; typical VOH ≈ 13.5 V and VOL ≈ 0.1 V at 20 mA. Rise/fall times ~50 ns into 1 nF. |+| 7 | VCC | power_in | Positive supply for the control IC and output driver. UVLO thresholds for the UC3845B are 8.5 V (on) / 7.6 V (off). Absolute max 36 V (internally zener-clamped); typical startup current 0.3 mA, operating current ~12 mA. |+| 8 | Vref | power_out | Buffered 5.0 V ±1% precision reference output (4.95-5.05 V at 25 °C, 1 mA). Sources up to ~50 mA to bias external circuitry and to feed the oscillator timing resistor RT. Short-circuit protected (~85 mA typ). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | onsemi |+| Package | SOIC-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `UC3845BD1R2GD1`+- `UC3845BD1R2GD1G`+- `UC3845BD1R2GD1R2G`+- `UC3845BD1R2GN`+- `UC3845BD1R2GNG`+- `UC3845BD1R2GD`+- `UC3845BD1R2GDG`+- `UC3845BD1R2GDR2G`++## CAD (KiCad official)++- Symbol: `UC3845BD1R2G`+- 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:** [onsemi datasheet](https://www.onsemi.com/pdf/datasheet/uc3845bd1r2-d.pdf) (22 pp, sha256 `811d8a44f6a2a239`, 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/uc3845bd1r2g-datasheet.pdf)

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