TD1688

@@ -0,0 +1,49 @@+# TD1688++**Techcode Semicon** · DC-DC Converters · ESOP-8++TD1688 from Techcode Semicon, in a ESOP-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 | SW | output | Power switching output; drain of the internal N-channel power MOSFET (RDS(ON) ≈ 0.7Ω). Connects to the external inductor and Schottky freewheeling diode to supply the output LC filter. Switches between VIN and near-GND at 480 kHz. |+| 2 | EN | input | On/Off enable input. Pull above VEN_R ≈ 1.35V (falling threshold ≈ 1.17V, hysteresis ≈ 180mV) to turn the device on. For automatic enable, connect to VIN through a 1MΩ resistor. Absolute max 6V. |+| 3 | NC | unconnected | Not connected. Leave floating or tie to ground; no internal bond. |+| 4 | FB | input | Feedback input to the internal error amplifier. Regulates to a 0.812V bandgap reference (0.792-0.832V). Connect to the tap of an external resistor divider from VOUT to GND. Frequency-foldback engages when FB < 300mV to limit short-circuit current. |+| 5 | GND | power_in | Signal/analog ground and voltage reference for the regulated output. Isolate this node from the D1-to-C1 high-current ground path to prevent switching current spikes from being induced into the sensitive analog reference. |+| 6 | NC | unconnected | Not connected. Leave floating or tie to ground; no internal bond. |+| 7 | VIN | power_in | Supply voltage input. Operates from 11V to 60V unregulated input (absolute max 60V). Requires a local bypass capacitor (C1, typ. 1µF ceramic X5R/X7R) to prevent large voltage spikes at the input. |+| 8 | BST | passive | Bootstrap capacitor node for the high-side gate driver. Connect a 0.1µF capacitor between SW and BST to form a floating supply that drives the power switch gate above VIN. Absolute max VBST = VSW-0.3 to VSW+6V. |+| 9 | GND | power_in | Exposed thermal pad. Electrically GND. Connect to the system ground plane with a large copper area for good thermal conductivity and low-impedance return; critical for maintaining junction temperature within limits (θJA ≈ 50°C/W). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Techcode Semicon |+| Package | ESOP-8 |+| Category | PMIC |+| Pins | 9 |++## Ordering variants++- `TD1688M`+- `TD1688MR`++## CAD (KiCad official)++- Symbol: `TD1688`+- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`+- 3D model: ESOP-8 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Techcode Semicon datasheet](docs/td1688-datasheet.pdf) (8 pp, sha256 `4efdec95ca3aa43f`, retrieved 2026-08-17, tier: lcsc)+- **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/td1688-datasheet.pdf)

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