LT3973EDD#TRPBF

@@ -0,0 +1,87 @@+# LT3973EDD#TRPBF++**Analog Devices** · DC-DC Converters · DFN-10-EP(3x3)++LT3973EDD#TRPBF from Analog Devices, in a DFN-10-EP(3x3). 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 | FB | input | Feedback pin for the adjustable LT3973. The internal error amplifier regulates FB to 1.21V; connect the tap of the external resistor divider from VOUT to GND here. FB bias current is typically 0.1nA (20nA max). |+| 2 | OUT | power_in | Output-sense pin used by the LT3973 to regulate the VIN-to-VOUT voltage during dropout conditions and to draw current for charging the boost capacitor. Connect to the regulated output; if the programmed output is greater than 14V, tie this pin to GND. Absolute max 14V. |+| 3 | EN/UVLO | input | Enable / undervoltage-lockout input. The part is in shutdown when this pin is low and active when high; the internal threshold is 1.19V rising with 30mV hysteresis (accurate only when VIN ≥ 4.2V). Tie to VIN if the shutdown feature is unused, or ground to force shutdown. Absolute max 42V. |+| 4 | VIN | power_in | Main supply input, 4.2V to 42V operating (42V absolute max). VIN supplies the internal circuitry and the internal power switch. Must be locally bypassed with a low-ESR ceramic capacitor. |+| 5 | GND | power_in | Device ground reference. Must be tied together with the exposed pad (pin 11) on the PCB. Serves as the return for VIN, EN/UVLO, and internal circuitry. |+| 6 | SW | output | Switch node - output of the internal high-side NPN power switch and drain of the integrated catch Schottky. Connect this pin to the external inductor. Sees VIN plus a diode drop during off-time; internal catch-diode current limit is typically 1.15A. |+| 7 | BOOST | passive | Bootstrap pin used to generate a drive voltage higher than VIN for the internal NPN power switch. A ceramic boost capacitor (typ. 0.47µF) is connected from BOOST to SW. Absolute max 55V (25V above SW). |+| 8 | BD | power_in | Boost-diode anode. Connect through the boost capacitor charging path - this pin drives the anode of the internal boost Schottky and also supplies current to the LT3973's internal regulator whenever BD is above 3.2V. Absolute max 25V. |+| 9 | PG | output | Power-good open-drain output from an internal comparator. PG remains low until FB is within 10% of the final regulation voltage; it is valid once VIN > 4.2V and EN/UVLO is high. Sink capability typ. 350µA at 0.4V; leakage 0.01µA at 3V. Add an external pull-up resistor. |+| 10 | RT | passive | Switching-frequency programming pin. Connect an external resistor from RT to GND to program the oscillator between 200kHz and 2.2MHz (e.g. 41.2k → 2.15MHz, 158k → 790kHz, 768k → 195kHz). |+| 11 | GND (Exposed Pad) | power_in | Exposed thermal pad on the underside of the DFN package. Electrically GND - must be soldered to the PCB ground plane for proper electrical and thermal performance (θJA = 40°C/W for the DD package). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | Analog Devices |+| Package | DFN-10-EP(3x3) |+| Category | Power Management (PMIC) |+| Pins | 11 |++## Ordering variants++Same part, different packaging or reel option.++- `LT3973EDD#PBF`+- `LT3973EDD#TRPBF`+- `LT3973EDD#TRPBFIDD#PBF`+- `LT3973EDD#TRPBFIDD#TRPBF`+- `LT3973EDD#TRPBFHDD#PBF`+- `LT3973EDD#TRPBFHDD#TRPBF`+- `LT3973EDD#TRPBFEDD-3.3#PBF`+- `LT3973EDD#TRPBFEDD-3.3#TRPBF`+- `LT3973EDD#TRPBFIDD-3.3#PBF`+- `LT3973EDD#TRPBFIDD-3.3#TRPBF`+- `LT3973EDD#TRPBFHDD-3.3#PBF`+- `LT3973EDD#TRPBFHDD-3.3#TRPBF`+- `LT3973EDD#TRPBFEDD-5#PBF`+- `LT3973EDD#TRPBFEDD-5#TRPBF`+- `LT3973EDD#TRPBFIDD-5#PBF`+- `LT3973EDD#TRPBFIDD-5#TRPBF`+- `LT3973EDD#TRPBFHDD-5#PBF`+- `LT3973EDD#TRPBFHDD-5#TRPBF`+- `LT3973EDD#TRPBFEMSE#PBF`+- `LT3973EDD#TRPBFEMSE#TRPBF`+- `LT3973EDD#TRPBFIMSE#PBF`+- `LT3973EDD#TRPBFIMSE#TRPBF`+- `LT3973EDD#TRPBFHMSE#PBF`+- `LT3973EDD#TRPBFHMSE#TRPBF`+- `LT3973EDD#TRPBFEMSE-3.3#PBF`+- `LT3973EDD#TRPBFEMSE-3.3#TRPBF`+- `LT3973EDD#TRPBFIMSE-3.3#PBF`+- `LT3973EDD#TRPBFIMSE-3.3#TRPBF`+- `LT3973EDD#TRPBFHMSE-3.3#PBF`+- `LT3973EDD#TRPBFHMSE-3.3#TRPBF`+- `LT3973EDD#TRPBFEMSE-5#PBF`+- `LT3973EDD#TRPBFEMSE-5#TRPBF`+- `LT3973EDD#TRPBFIMSE-5#PBF`+- `LT3973EDD#TRPBFIMSE-5#TRPBF`+- `LT3973EDD#TRPBFHMSE-5#PBF`+- `LT3973EDD#TRPBFHMSE-5#TRPBF`++## CAD (KiCad official)++- Symbol: `LT3973EDD#TRPBF`+- Footprint: `Package_DFN_QFN:DFN-10-1EP_3x3mm_P0.5mm_EP1.55x2.48mm`+- 3D model: DFN-10-EP(3x3) (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Analog Devices datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588914472979746816) (24 pp, sha256 `8b84083bfbac6278`, 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/lt3973edd-trpbf-datasheet.pdf)