# 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](docs/eup8209-84dir1-datasheet.pdf) (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](docs/eup8209-84dir1-datasheet.pdf)