PJ4054B

@@ -0,0 +1,40 @@+# PJ4054B++**PJSEMI** · Battery Management · SOT-23-5++PJ4054B from PJSEMI, in a SOT-23-5. 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 output. Pulled low by an internal N-channel MOSFET while battery charging is in progress (VCHRG(low) <= 0.6V at ICHRG = 5mA). Goes high-impedance when the charge cycle terminates or when VCC is in undervoltage lockout. Typically drives an indicator LED to VIN through a series resistor (e.g. 1k). |+| 2 | GND | power_in | Device ground reference. |+| 3 | BAT | power_out | Charging current output to the lithium-ion battery. Regulates the final float voltage to 4.2V (typ, 4.158-4.242V) via a precise internal resistor divider that is disconnected in shutdown. Sourcing capability up to 500mA (typical) set by RPROG. Bypass with ~10uF ceramic capacitor to ground. |+| 4 | VCC | power_in | Positive input supply to the charger. Operating range 4.25V to 6.5V (absolute max VSS+7V); bypass with at least 1uF (typically 4.7uF) to GND. When VCC falls to within ~30mV of VBAT, or below the UVLO threshold (~3.8V), the part enters standby/stop mode and IBAT drops below ~2uA. |+| 5 | PROG | bidirectional | Charge current programming, monitor, and manual-shutdown pin. Connect a 1% resistor RPROG from PROG to GND: IBAT = (VPROG/RPROG) * 1000 (e.g. 2kOhm -> 500mA, 10kOhm -> 100mA). Pin regulates to 1V (typ) in constant-current mode and can be measured as a current-monitor output. Leaving the resistor floating pulls the pin above the 1.21V (typ) shutdown threshold via an internal ~2.5uA (2uA typ) pull-up, forcing the charger into stop mode (ICC ~= 25uA). |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | PJSEMI |+| Package | SOT-23-5 |+| Category | PMIC |+| Pins | 5 |++## CAD (KiCad official)++- Symbol: `PJ4054B`+- Footprint: `Package_TO_SOT_SMD:SOT-23-5`+- 3D model: SOT-23-5 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [PJSEMI datasheet](docs/pj4054b-datasheet.pdf) (6 pp, sha256 `71f5fc869da0b682`, 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/pj4054b-datasheet.pdf)

@@ -0,0 +1,34 @@+{+  "slug": "pj4054b",+  "version": "0.1.0",+  "type": "component",+  "description": "PJSEMI Battery Management, SOT-23-5. Datasheet-verified pinout, KiCad symbol/footprint/3D.",+  "tags": [+    "component",+    "pmic",+    "pj4054b"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "pj4054b.kicad_sym",+    "pj4054b.kicad_mod",+    "pj4054b.glb",+    "pj4054b.step",+    "pj4054b.lbr",+    "docs/hero.png",+    "docs/pj4054b-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file