LT8609AIMSE#PBF

@@ -0,0 +1,67 @@+# LT8609AIMSE#PBF++**Analog Devices** · DC-DC Converters · MSOP-10-EP++LT8609AIMSE#PBF from Analog Devices, in a MSOP-10-EP. 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 | BST | passive | Bootstrap capacitor pin providing the drive voltage (above VIN) for the internal top-side power NMOS switch. Place a 0.1µF ceramic capacitor from BST to SW as close to the IC as possible; do not place a series resistor. |+| 2 | SW | power_out | Switch node - output of the internal top-side and synchronous bottom-side power MOSFETs. Connect to the external inductor and to the bootstrap capacitor. Keep this node small on the PCB for good EMI/thermal performance. |+| 3 | INTVCC | power_out | Internal 3.5V LDO regulator bypass pin that supplies the internal gate drivers and control circuits. Voltage varies from 2.8V to 3.5V; max output 20mA. Decouple to GND with at least a 1µF low-ESR ceramic capacitor. Do not load with external circuitry. |+| 4 | RT | input | Oscillator frequency-set pin. Tie a resistor from RT to GND to program the switching frequency between 200kHz (RT = 221kΩ) and 2.2MHz (RT = 16.2kΩ). |+| 5 | SYNC | input | External clock synchronization / mode-select input. Tie to GND for low-ripple Burst Mode; drive with an external clock (200kHz-2.2MHz) to synchronize; leave floating for pulse-skipping mode; tie to INTVCC or 3.2V-5.0V for pulse-skipping mode with spread-spectrum modulation. |+| 6 | FB | input | Feedback input for the adjustable-output LT8609A. Regulated to 0.782V. Connect to the tap of the external VOUT-to-GND resistor divider that programs the output voltage. Add a ~10pF phase-lead capacitor from VOUT to FB when using large divider resistors. |+| 7 | TR/SS | input | Output tracking and soft-start pin. An internal 2µA pull-up from INTVCC charges an external capacitor to program the output-voltage slew rate. Below 0.782V the part regulates FB to the TR/SS voltage; above 0.782V tracking is disabled. Pulled to GND through a 300Ω MOSFET in shutdown and fault conditions. |+| 8 | PG | output | Power-good open-drain output. Held low until FB is within ±8.5% of the regulation setpoint and no fault is present. Absolute max 42V; valid when VIN > 3.2V regardless of EN/UV state. Requires an external pull-up resistor. |+| 9 | VIN | power_in | Main input supply pin, 3.0V to 42V. Supplies internal control circuitry and the internal top-side power switch. Locally bypass with a low-ESR ceramic capacitor placed close to VIN and the exposed-pad GND. |+| 10 | EN/UV | input | Enable / input under-voltage lockout pin. Rising threshold 1.05V, falling 1.00V. Ground to shut the part down (IQ ≈ 1µA); tie to VIN if shutdown/UVLO is not used, or use an external VIN divider to program a precise VIN turn-on threshold. Absolute max 42V. |+| 11 | GND | power_in | Exposed thermal pad - signal and power ground return. Must be soldered directly to the PCB ground plane both for the electrical return path and to achieve the specified θJA = 40°C/W thermal resistance. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Analog Devices |+| Package | MSOP-10-EP |+| Category | Power Management (PMIC) |+| Pins | 11 |++## Ordering variants++Same part, different packaging or reel option.++- `LT8609AIMSE#PBFEMSE`+- `LT8609AIMSE#PBF`+- `LT8609AIMSE#PBFHMSE`+- `LT8609AIMSE#PBFJMSE`+- `LT8609AIMSE#PBFEMSE16`+- `LT8609AIMSE16`+- `LT8609AIMSE#PBFHMSE16`+- `LT8609AIMSE#PBFJMSE16`+- `LT8609AIMSE#PBFEDDM`+- `LT8609AIMSE#PBFJDDM`+- `LT8609AIMSE#PBFHDDM`+- `LT8609AIMSE#PBFEDDM-3.3`+- `LT8609AIMSE#PBFJDDM-3.3`+- `LT8609AIMSE#PBFEDDM-5`+- `LT8609AIMSE#PBFJDDM-5`+- `LT8609AIMSE#PBFHDDM-5`++## CAD (KiCad official)++- Symbol: `LT8609AIMSE#PBF`+- Footprint: `Package_SO:MSOP-10-1EP_3x3mm_P0.5mm_EP1.68x1.88mm`+- 3D model: MSOP-10-EP (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Analog Devices datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8589836534217682944) (30 pp, sha256 `bb514bf594e97238`, 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/lt8609aimse-pbf-datasheet.pdf)

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