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 (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