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UC2845AQD8R
Public Unreviewedby Ray
Texas Instruments DC-DC Converters, SOIC-8. Datasheet-verified pinout, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownUC2845AQD8R
Texas Instruments · DC-DC Converters · SOIC-8
UC2845AQD8R from Texas Instruments, 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. Used for loop compensation; connect an RC network between COMP and VFB to set the closed-loop response. VOUT high 5-6 V (RL=15 kΩ to GND); VOUT low 0.7-1.1 V (RL=15 kΩ to VREF). |
| 2 | VFB | input | Inverting input of the error amplifier. Regulated to 2.5 V (typ) internal reference; bias current -0.3 µA typical, -1 µA max. |
| 3 | ISENSE | input | Current-sense input to the PWM current-sense comparator. Analog input rated -0.3 V to 6.3 V; internal current-sense gain 3 V/V (typ) with 1 V (typ) maximum input signal (COMP = 5 V) for pulse-by-pulse current limiting. |
| 4 | RT/CT | passive | Oscillator timing pin. Connect RT from VREF to this pin and CT from this pin to GND to set the oscillator frequency (up to 500 kHz). Trimmed discharge current 8.3 mA (typ). |
| 5 | GND | power_in | Device ground. Common return for control circuitry and output totem-pole driver in the 8-pin package. |
| 6 | OUTPUT | output | High-current totem-pole gate driver output for driving an external power MOSFET. ±1 A peak output current; rise/fall times ~50 ns (CL = 1 nF). During UVLO the output sinks at least 10 mA at less than 1.2 V (for VCC > 5 V). |
| 7 | VCC | power_in | Positive supply for the IC and output driver. UVLO start threshold 8.4 V (typ), turn-off 7.6 V (typ) for UC2845A; low startup current <0.5 mA. Absolute max 30 V (low-impedance source), otherwise self-limiting via internal 34 V zener. |
| 8 | VREF | power_out | Trimmed 5.0 V (±1%) reference output, up to 50 mA. Short-circuit protected (-100 mA typ). Bypass to GND with a ceramic capacitor; also used to bias RT. |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Package | SOIC-8 |
| Category | PMIC |
| Pins | 8 |
Ordering variants
Same part, different packaging or reel option.
UC2845AQD8RUC2845AQDR
CAD (KiCad official)
- Symbol:
UC2845AQD8R - 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: Texas Instruments datasheet (19 pp, sha256
4548a599e62f0bef, 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).