JTD4054

@@ -0,0 +1,41 @@+# JTD4054++**JTD** · Battery Management · SOT-23-5L++JTD4054 from JTD, in a SOT-23-5L. 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 | CHRG | output | Open-drain charge-status indicator. Pulled low internally while charging; high-impedance when charging ends. Blinks (via internal switch toggling) if a charger is plugged in with no battery attached. VOL = 50 mV typ at ICHRG = 5 mA; leave floating or tied to GND if unused. |+| 2 | GND | power_in | Device ground / power return. |+| 3 | BAT | power_out | Battery positive terminal. Sources charge current to the Li-ion/Li-poly cell and regulates the float voltage to 4.2 V. Leakage into this pin drops to ~5 nA in sleep mode (VCC absent) and ~1.2 µA in standby. Absolute rating: -11 V to +13 V; max continuous current 500 mA. |+| 4 | VCC | power_in | Charger input supply, 4.5 V to 6.5 V typical (abs max 10 V). Charging starts when VCC exceeds the UVLO threshold (3.5 V typ) AND is at least ~110 mV above VBAT; the device enters low-power sleep when VCC falls below UVLO or within 50 mV of VBAT. Bypass with 2.2 µF to GND. |+| 5 | PROG | input | Charge-current program pin. A resistor RPROG from PROG to GND sets constant-current charge current: IBAT = 1000 V / RPROG (RPROG ≥ 2 kΩ, i.e. ICC ≤ 500 mA). Pin is regulated to 1.0 V in CC mode and to 0.1 V during trickle charge; end-of-charge is detected when this pin drops below 100 mV (15% of set current) for > 1.4 ms. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | JTD |+| Package | SOT-23-5L |+| Category | PMIC |+| Pins | 5 |++## CAD (KiCad official)++- Symbol: `JTD4054`+- Footprint: `Package_TO_SOT_SMD:SOT-23-5`+- 3D model: SOT-23-5L (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [JTD datasheet](docs/jtd4054-datasheet.pdf) (8 pp, sha256 `c73d518dd59f6707`, retrieved 2026-08-17, tier: lcsc)+- **Datasheet language:** Chinese. Pin names, descriptions, and specs on this page were extracted and translated to English by ds2sf; the linked PDF is the manufacturer original.+- **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/jtd4054-datasheet.pdf)

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