CN3125

@@ -0,0 +1,48 @@+# CN3125++**ShangHai Consonance Elec** · Battery Management · ESOP-8++CN3125 from ShangHai Consonance Elec, 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 | CE | input | Chip Enable. A logic high enables normal operation; pulling CE low puts the CN3125 into disable mode and the whole device is turned off. TTL/CMOS compatible (VCEH >= 2.2V, VCEL <= 0.7V). |+| 2 | ISET | passive | Constant charge current setting and charge current monitor pin. Charge current is programmed by a resistor R_ISET from this pin to GND; V_ISET is regulated to 1.205V in constant-current mode. Charge current: ICH = (V_ISET / R_ISET) x 986. |+| 3 | GND | power_in | Ground terminal. |+| 4 | VIN | power_in | Positive input supply voltage (2.7V to 6V, absolute max 6.5V). Powers internal circuitry and the on-chip P-channel power MOSFET. When VIN drops within 10mV of the TOP pin voltage, the part enters low-power sleep mode (TOP/MID current < 3uA). |+| 5 | TOP | power_out | Positive terminal connection to the top supercapacitor. Charge current is delivered from this pin. For 2-cell configuration, connect to the positive terminal of the top supercap; for single-cell, tie the single supercap between TOP and GND. Continuous short-circuit tolerant. |+| 6 | MID | bidirectional | Middle connection of the 2 supercapacitors. The negative terminal of the top supercap and the positive terminal of the bottom supercap connect here. Sources/sinks active cell-balancing shunt current (I_SHTOP up to ~55mA typ, I_SHBOT up to ~50mA typ). Continuous short-circuit tolerant. |+| 7 | PG | output | Open-drain Power Good output (active-low, /PG). Pulls low when the supercapacitor voltage rises above ~94.1% of the final regulated voltage set at FB, and returns to high-impedance when it falls below ~90%. High-impedance when disabled or in sleep mode. Sink current up to 10mA at V_PG = 0.3V. |+| 8 | FB | input | Supercapacitor voltage feedback pin. The constant-voltage regulation point is set by an external resistor divider tied from TOP (or MID for single-cell) to FB to GND; internal reference V_REGFB = 1.205V (1.193-1.217V). Leakage +/-100nA max. |+| 9 | EP | power_in | Exposed thermal pad on the underside of the eSOP-8 package. Must be soldered to the GND plane for proper electrical grounding and heat dissipation. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | ShangHai Consonance Elec |+| Package | ESOP-8 |+| Category | PMIC |+| Pins | 9 |++## Ordering variants++- `CN3125`++## CAD (KiCad official)++- Symbol: `CN3125`+- 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:** [ShangHai Consonance Elec datasheet](docs/cn3125-datasheet.pdf) (11 pp, sha256 `01642d3ae17a657f`, 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/cn3125-datasheet.pdf)

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