UC2845BD1R2G

@@ -0,0 +1,54 @@+# UC2845BD1R2G++**onsemi** · AC-DC Controllers and Regulators · SOIC-8++UC2845BD1R2G 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, made available for external loop compensation. Typical output swing is 0.8 V (low) to 6.2 V (high) with RL = 15 kOhm; sinks up to 12 mA, sources up to 1 mA. |+| 2 | Voltage Feedback | input | Inverting input of the Error Amplifier. Normally connected to the switching power supply output through a resistor divider. Internally biased at 2.5 V; input bias current typically -0.1 uA (max -2 uA). |+| 3 | Current Sense | input | Current sense input. A voltage proportional to inductor current is applied here; the PWM uses it to terminate output switch conduction cycle-by-cycle. Internal comparator threshold clamped at 1.0 V typical; current-sense-to-output propagation delay 150 ns typical. |+| 4 | RT/CT | passive | Oscillator timing pin. Program frequency and maximum output duty cycle by connecting resistor RT from Vref to this pin and capacitor CT from this pin to ground. Oscillator operation down to 1.0 kHz is possible; typical CT swing is 1.2 V to 2.8 V. |+| 5 | GND | power_in | Combined control-circuitry and power ground return for the 8-pin package. |+| 6 | Output | output | Totem-pole gate driver output for a power MOSFET. Sources and sinks peak currents up to 1.0 A; switches at one-half the oscillator frequency. VOH ~13.5 V and VOL ~0.1 V at 20 mA; rise/fall time ~50 ns typical into 1.0 nF. |+| 7 | VCC | power_in | Positive supply for the control IC. Absolute maximum 36 V (Zener clamped at ~36 V, ICC(max) 30 mA). UC2845B UVLO turn-on 8.5 V typical, turn-off 7.6 V typical; startup current ~0.3 mA, operating current ~12 mA typical. |+| 8 | Vref | power_out | 5.0 V trimmed reference output (4.95 V min, 5.05 V max at IO = 1 mA, 25 degC). Supplies charging current for CT through RT. Short-circuit current typically -85 mA (limited to -180 mA max). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | onsemi |+| Package | SOIC-8 |+| Category | PMIC |+| Pins | 8 |++## Ordering variants++- `UC2845BD1R2GD1`+- `UC2845BD1R2GD1R2G`+- `UC2845BD1R2GD1G`+- `UC2845BD1R2GN`+- `UC2845BD1R2GNG`+- `UC2845BD1R2GD`+- `UC2845BD1R2GDG`+- `UC2845BD1R2GDR2G`++## CAD (KiCad official)++- Symbol: `UC2845BD1R2G`+- 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/uc2845bd1r2-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/uc2845bd1r2g-datasheet.pdf)

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