UCC27517

@@ -0,0 +1,48 @@+# UCC27517++**Texas Instruments** · Low-side gate driver · SOT-23-5++Single-channel, high-speed low-side gate driver in a SOT-23-5 package, with symmetrical +/-4 A peak source and sink into a power MOSFET gate. It runs from a 4.5 to 18 V bias and takes a MCU/PWM logic signal on a matched pair of inputs (IN+ noninverting, IN- inverting) with TTL/CMOS thresholds independent of VDD, so you pick the polarity and use the other input as an enable. Internal UVLO holds OUT low for glitch-free power-up. The buffer between a controller and a big MOSFET when the pin can't drive the gate fast enough.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | VDD | power_in | Bias supply input. Recommended operating range 4.5 V to 18 V (12 V nominal). Bypass to GND with a low-ESR capacitor (e.g., 1 µF) placed close to the device. Internal UVLO holds OUT low outside the VDD operating range. |+| 2 | GND | power_in | Ground return. All device signals are referenced to this pin. Provide a low-inductance path back to the source of the driven power MOSFET. |+| 3 | IN+ | input | Noninverting driver input. When used in inverting configuration, tie IN+ to VDD to enable the output; OUT is held LOW if IN+ is unbiased or floating. TTL/CMOS-compatible thresholds (V_IH typ 2.2 V, V_IL typ 1.2 V) independent of VDD, with ~1 V hysteresis. Absolute max on input pins is 20 V, not restricted by VDD. |+| 4 | IN- | input | Inverting driver input. When used in noninverting configuration, tie IN- to GND to enable the output; OUT is held LOW if IN- is unbiased or floating. Shares the same TTL/CMOS-compatible thresholds and hysteresis as IN+. May be used as an enable/disable pin when the driver is configured single-input. |+| 5 | OUT | output | Gate-drive sourcing/sinking current output. Symmetrical ±4-A peak drive into a capacitive load (rail-to-rail). Typical R_OH ≈ 5 Ω (P-channel pullup) and R_OL ≈ 0.5 Ω (pulldown) at VDD = 12 V. Held LOW during VDD UVLO to guarantee glitch-free power-up/down. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Single-channel low-side gate driver |+| Peak drive | +/-4 A (symmetrical, rail-to-rail) |+| Bias voltage (VDD) | 4.5-18 V |+| Inputs | IN+ / IN- (TTL/CMOS, VDD-independent thresholds) |+| Pull-up / pull-down | ROH ~5 ohm / ROL ~0.5 ohm @ 12 V |+| Protection | UVLO holds OUT low |+| Package | SOT-23-5 |+| Body (L×W×H) | 2.9 × 1.6 × 1.1 mm |++## Ordering variants++- `UCC27517DBVR (SOT-23-5, tape & reel)`++## CAD (KiCad official)++- Symbol: `UCC27517 (Adom-authored grouped symbol via adom-symbol; not in KiCad libs)`+- Footprint: `Package_TO_SOT_SMD:SOT-23-5`+- 3D model: SOT-23-5 (KiCad packages3D)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/ucc27517.pdf) (37 pp, sha256 `6b7b8c088746010d`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude) — every pin and dimension is cited to a datasheet page; refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/ucc27517-datasheet.pdf)

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