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EUP8209-84DIR1

Eutech Microelectronics · Battery Management ICs · SOP-8

EUP8209-84DIR1 from Eutech Microelectronics, in a SOP-8. Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.

Pinout

Pin	Name	Type	Function
1	SENSE	input	Current amplifier sense input; a sense resistor RSENSE must be connected between the SENSE and BAT pins, and the maximum charge current equals 100mV/RSENSE.
2	NTC	input	NTC thermistor input; with an external 10kΩ NTC to ground it senses battery temperature and stops the charger when out of range, and grounding it disables the temperature qualification.
3	COMP	passive	Compensation, soft-start and shutdown control pin; charging begins at 850mV and pulling COMP below 280mV shuts the charger down.
4	VCC	power_in	Positive supply voltage input; the EUP8209-84 version is specified with a VCC supply range of 8.9V to 20V.
5	SW	output	Power switching output of the buck converter.
6	GND	power_in	IC ground pin, which also serves as a heat sink and should have generous copper around it.
7	CHRG	output	Charge status output, pulled low by an internal N-channel MOSFET capable of driving an LED and specified with a CHRG output low voltage of 50mV maximum at 1mA.
8	BAT	input	Battery sense input, requiring a 22µF bypass capacitor to minimize ripple voltage; when VBAT is within 250mV of VCC the device enters sleep mode, dropping ICC to 10µA.

Key specifications

Parameter	Value
Manufacturer	Eutech Microelectronics
Package	SOP-8
Category	Power Management ICs
Pins	8

Electrical characteristics

Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).

Parameter	Symbol	Min	Typ	Max	Unit	Conditions	Page
VCC Supply Voltage	VCC	8.9		20	V		7
VCC Supply Current Current Mode	ICC	1.5		5	mA	Current Mode	7
VCC Supply Current Shutdown Mode	ICC	1.5		5	mA	Shutdown Mode	7
VCC Supply Current Sleep Mode	ICC	10		20	µA	Sleep Mode	7
Battery Regulated Float Voltage (8.4 version)	VBAT(FLT)	8.316	8.4	8.484	V	9V≦ VCC ≦ 20V, 0°C≦ TA ≦85°C	7
Constant Current Sense Voltage	VSNS(CHG)	90	100	110	mV	TA =25°C	7
Constant Current Sense Voltage	VSNS(CHG)	85		115	mV	6V≦ VBAT ≦ 8V, -40°C≦ TA ≦85°C	7
Trickle Current Sense Voltage	VSNS(TRKL)	8	15	22	mV	VBAT = 1V	7
Trickle Charge Threshold Voltage	VTRKL	4.7	5	5.3	V	VBAT = Rising	7
VCC Undervoltage Lockout Threshold Voltage	VUV	7.5		8.5	V	VCC = Rising	7
VCC Undervoltage Lockout Hysteresis Voltage	∆VUV		500		mV		7
Manual shutdown Threshold Voltage	VMSD	150	280	450	mV	COMP Pin Falling	7
Automatic shutdown Threshold Voltage	VASD		250		mV	VCC - VBAT	7
COMP Pin Output Current	ICOMP		100		µA	VCOMP = 1.2V	7
CHRG Pin Output Low Voltage	VCHRG	20		50	mV	ICHRG = 1mA	7
End-of-Charge Ratio	REOC	5	15	25	%	VSNS(EOC) /VSNS(CHG)	7
Charge time Accuracy	tTIMER		10		%		7
NTC Pin Output Current	INTC	75	85	95	µA	VNTC = 0.85V	7
NTC Pin Threshold Voltage (Hot)	VNTC	340	360	380	mV	VNTC = Falling	7
NTC Pin Threshold Voltage (Hot) Hysteresis	VNTC-HOT		5		mV	Hysteresis	7
NTC Pin Threshold Voltage (Cold)	VNTC	2.35	2.4	2.45	V	VNTC = Rising	7
NTC Pin Threshold Voltage (Cold) Hysteresis	VNTC-COLD		100		mV	Hysteresis	7
Recharge Battery Voltage Offset from Full Charged Battery Voltage	∆VRECHRG	200	300	400	mV	VBAT(FULLCHARGD) -VRECHRG, VBAT Falling	7
CHRG Pin Leakage Current	ILEAK			1	µA	VCHRG= 8V, Charging Stops	7
High-Side Switch On-Resistance	RDSON		55		mΩ		7
Switching Frequency	fOSC	450	500	550	kHz		8
DC Maximum Duty Cycle	DC			100	%		8
VCC Supply Voltage (absolute maximum)	VCC			22	V		6
SW pin voltage	SW	-1			V	max is VCC	6
BAT, SENSE pin voltage		-0.3		14	V		6
CHRG, NTC pin voltage		-0.3		8	V		6
Operating Temperature Range		-40		85	°C		6
Storage Temperature Range		-65		125	°C		6
Lead Temperature (Soldering, 10sec)				260	°C		6
ESD protection				2	kV		6

Materials and finish

As the datasheet states them (page.json metadata.appearance; the 3D model's colours follow it).

Part	Material	Colour / plating	Datasheet says	Page
contacts	copper		disrupting the loop stability. The ground pin also works as a heat sink, therefore use a generous amount of copper	18

CAD (KiCad official)

Symbol: EUP8209-84DIR1
Footprint: Package_SO:SOIC-8_3.9x4.9mm_P1.27mm
3D model: SOP-8 (KiCad packages3D, STEP)
3D model files: eup8209-84dir1-etched.step / eup8209-84dir1-etched.glb carry the MPN laser-etched on the die in a toggleable Adom.LaserEtch group (Fusion-ready); eup8209-84dir1.step / eup8209-84dir1.glb are the bare package body.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

Datasheet: Eutech Microelectronics datasheet (19 pp, sha256 8a750af83005ce74, retrieved 2026-10-27, tier: lcsc)
Extractor: parts-factory 2.0.0 / extract_pins 0.3, primary claude-haiku-5-5 (text), consensus off (skipped (clean text read)), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish.
CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF