DRV8871

@@ -0,0 +1,52 @@+# DRV8871++**Texas Instruments** · Brushed DC motor driver · HTSSOP-8 (PowerPAD)++Single H-bridge driver for one brushed DC motor from a 6.5 to 45 V supply, delivering up to 3.6 A peak. Two logic inputs (IN1, IN2) set forward, reverse, brake, and coast directly, and the internal current regulation trips at a level set by one resistor at ILIM, so the driver limits inrush and stall current without a sense resistor in the motor path. Built-in undervoltage, overcurrent, and overtemperature protection shut the bridge down and recover automatically. The PowerPAD carries heat into the board copper.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | GND | power_in | Logic ground. Connect to board ground. |+| 2 | IN2 | input | Logic input 2. Together with IN1 controls the H-bridge outputs (forward/reverse/brake/coast) and PWM speed. Has an internal ~100 kΩ pulldown to GND; input logic threshold VIL=0.5 V max, VIH=1.5 V min, 5.5 V max. |+| 3 | IN1 | input | Logic input 1. Together with IN2 controls the H-bridge outputs and PWM speed. Has an internal ~100 kΩ pulldown to GND; input logic threshold VIL=0.5 V max, VIH=1.5 V min, 5.5 V max. |+| 4 | ILIM | input | Current-limit control. Connect a resistor from ILIM to GND to set the internal current-chopping threshold using ITRIP = VILIM / (RILIM × AV), where VILIM ≈ 64 kV constant. |+| 5 | VM | power_in | 6.5-V to 45-V motor power supply. Connect a 0.1-µF bypass capacitor to ground plus sufficient bulk capacitance rated for VM. UVLO trips at ~6.1-6.4 V falling. |+| 6 | OUT1 | output | H-bridge output 1. Connect directly to one motor terminal or other inductive load. Drives up to 3.6 A peak; RDS(on) ≈ 565 mΩ (HS+LS typ). |+| 7 | PGND | power_in | High-current (power) ground path for the low-side FET sources. Connect to board ground. |+| 8 | OUT2 | output | H-bridge output 2. Connect directly to the other motor terminal or inductive load. Drives up to 3.6 A peak. |+| PAD | PAD | passive | Exposed thermal pad on the underside. Connect to board ground and use large copper pours and multiple thermal vias on multiple layers for heat dissipation. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Brushed DC motor driver (single H-bridge) |+| Supply (VM) | 6.5-45 V |+| Peak current | 3.6 A |+| RDS(on) | 565 mΩ (HS + LS, typ) |+| Control | PWM via IN1 / IN2 |+| Current limit | Adjustable via ILIM resistor |+| Protection | UVLO, OCP, OTP (auto-recover) |+| Package | HTSSOP-8 (PowerPAD) |++## Ordering variants++- `DRV8871DDAR (HTSSOP-8, tape & reel)`++## CAD (KiCad official)++- Symbol: `Driver_Motor:DRV8871DDA (KiCad official)`+- Footprint: `Package_SO:Texas_HTSOP-8-1EP_3.9x4.9mm_P1.27mm_EP2.95x4.9mm_Mask2.4x3.1mm_ThermalVias`+- 3D model: HTSSOP-8 PowerPAD (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/drv8871.pdf) (27 pp, sha256 `09de551aa0c6d090`, 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/drv8871-datasheet.pdf)

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