CN3722

@@ -0,0 +1,51 @@+# CN3722++**ShangHai Consonance Elec** · Battery Management · TSSOP-16++CN3722 from ShangHai Consonance Elec, in a TSSOP-16. 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 | VG | power_out | Internal LDO regulator output that powers the internal gate-driver circuitry. Connect a 100 nF decoupling capacitor between VG and VCC. |+| 2 | PGND | power_in | Power ground return for the gate driver. |+| 3 | GND | power_in | Analog ground reference for the control circuitry. |+| 4 | CHRG | output | Open-drain charge status indicator (active low). Internal transistor pulls this pin low during trickle-charge, constant-current, and constant-voltage charging; otherwise high-impedance. Rated up to 30 V, sink 12 mA typ. |+| 5 | DONE | output | Open-drain charge-complete indicator (active low). Internal transistor pulls this pin low when charging ends; otherwise high-impedance. Rated up to 30 V, sink 12 mA typ. |+| 6 | TEMP | input | Battery temperature sensing input. Connect an NTC thermistor (typ. 10 kΩ) between TEMP and GND. Internal 55 µA pull-up; charging is suspended when temperature is out of range (Vthh 1.61 V / Vthl 0.175 V). |+| 7 | MPPT | input | Solar panel maximum-power-point tracking input. Regulated to 1.04 V at 25 °C with a −0.4 %/°C temperature coefficient to match a Si solar cell's MPP voltage. Requires an external resistor divider from the panel to sense its terminal voltage. |+| 8 | COM1 | passive | Loop compensation input 1. Connect a 470 pF capacitor from this pin to GND. |+| 9 | COM2 | passive | Loop compensation input 2. Connect a 120 Ω resistor in series with a 220 nF capacitor from this pin to GND. |+| 10 | FB | input | Battery voltage feedback input. Sense the battery voltage through an external resistor divider; the regulator holds this pin at 2.416 V. Bias current ~50 nA typ (300 nA max). |+| 11 | COM3 | passive | Loop compensation input 3. Connect a 100 nF capacitor from this pin to GND. Absolute max 6.5 V. |+| 12 | NC | unconnected | No connection. Leave floating. |+| 13 | CSP | input | Positive input of the charge-current sense amplifier. CSP and BAT measure the voltage across the sense resistor R_CS to close the current-regulation loop. In CC mode V(CSP−BAT) = 200 mV typ (→ I_chg = 200 mV / R_CS). |+| 14 | BAT | input | Negative input of the charge-current sense amplifier and battery-terminal connection. Together with CSP measures V(R_CS) and monitors the battery voltage for over-voltage protection (Vov = 1.08·V_REG typ). |+| 15 | VCC | power_in | Main supply input for the chip and internal circuitry. Operating range 7.5-28 V; UVLO ≈ 6 V. Bypass to GND with a local filter capacitor. |+| 16 | DRV | output | Gate drive output for the external P-channel MOSFET (buck high-side switch). Referenced to VCC: VH (VCC−DRV) = 60 mV @ −10 mA, VL = 6.5 V typ; ~40 ns rise/fall into 2 nF; f_osc = 300 kHz, D_max = 94 %. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | ShangHai Consonance Elec |+| Package | TSSOP-16 |+| Category | PMIC |+| Pins | 16 |++## CAD (KiCad official)++- Symbol: `CN3722`+- Footprint: `Package_SO:TSSOP-16_4.4x5mm_P0.65mm`+- 3D model: TSSOP-16 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [ShangHai Consonance Elec datasheet](docs/cn3722-datasheet.pdf) (12 pp, sha256 `311dd6f804ec3a0f`, 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/cn3722-datasheet.pdf)

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