CN3705

@@ -0,0 +1,52 @@+# CN3705++**ShangHai Consonance Elec** · Battery Management · TSSOP-16++CN3705 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. Provides power to the internal driver circuitry. Connect a 100nF capacitor between VG and VCC. |+| 2 | PGND | power_in | Power ground. |+| 3 | GND | power_in | Analog ground. |+| 4 | CHRG | output | Open-drain output. Pulled low by an internal transistor while charging; high-impedance otherwise. Typical pull-down current 12mA at VCHRG=1V; leakage <1uA at 25V. |+| 5 | DONE | output | Open-drain output. Pulled low by an internal transistor when charging is complete; high-impedance otherwise. Typical pull-down current 12mA at VDONE=1V; leakage <1uA at 25V. |+| 6 | TEMP | input | Battery temperature monitoring input. Connect an NTC thermistor (typ. 10kΩ) between this pin and GND. Internal 50uA pull-up; comparator thresholds Vthh=1.61V (rising) and Vthl=0.175V (falling). |+| 7 | EOC | input | End-of-charge current setting pin. Connect directly to GND or through a resistor to GND to set the termination current per IEOC = 1.278×(14350+Rext)/(RCS×10^6). Rext ≤ 100kΩ. |+| 8 | COM1 | passive | Loop compensation input 1. Connect a 470pF capacitor between this pin and GND. |+| 9 | COM2 | passive | Loop compensation input 2. Connect a 120Ω resistor in series with a 220nF capacitor between this pin and GND. |+| 10 | FB | input | Battery voltage feedback input. External resistor divider from the battery sets the CV regulation voltage: VBAT = 2.416×(1+R7/R6)+IB×R7. Typical VFB=2.416V, IFB≈50nA. |+| 11 | COM3 | passive | Loop compensation input 3. Connect a 100nF capacitor between this pin and GND. Absolute max voltage on this pin is 6.5V. |+| 12 | NC | unconnected | No connection. |+| 13 | CSP | input | Positive input of the charge-current sense amplifier. CSP and BAT sense the voltage across the external sense resistor RCS (200mV/RCS sets constant charge current ICH). |+| 14 | BAT | input | Negative input of the charge-current sense amplifier and battery terminal sense. CSP and BAT measure the voltage across RCS to regulate charge current. |+| 15 | VCC | power_in | External supply input and internal circuit power. Operating range 7.5V to 28V; UVLO typ. 6V. Requires a bypass capacitor to GND. |+| 16 | DRV | output | Gate driver output for external P-channel MOSFET. VH (VCC−VDRV) typ. 60mV at IDRV=−10mA; VL typ. 6.5V at IDRV=0mA. Rise/fall time ~40ns into 2nF. |++## Key specifications++| Parameter | Value |+|---|---|+| Manufacturer | ShangHai Consonance Elec |+| Package | TSSOP-16 |+| Category | PMIC |+| Pins | 16 |++## CAD (KiCad official)++- Symbol: `CN3705`+- 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/cn3705-datasheet.pdf) (12 pp, sha256 `31298125f291dc5e`, 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/cn3705-datasheet.pdf)

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