# LP7801SPF

**LOWPOWER** · Battery Management · ESOP-8

LP7801SPF from LOWPOWER, in a ESOP-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 | ISET | passive | Charge-current setting pin: the constant-charge current IBAT is set by resistor RISET per a formula that uses VISET = 1V, and the datasheet example values are ISET=17.5K for 100 mA and ISET=3.4K for 515 mA. |
| 2 | VIN | power_in | Charger input: operating input voltage is 4.5V to 5.8V (5V typ.), overvoltage protection trips at 6.3V (typ.) with 400mV hysteresis, and undervoltage lockout is 3.3V; absolute maximum is -0.3V to 36V. |
| 3 | BAT | bidirectional | Battery connection serving as charger output and boost discharge input; the float voltage is 4.2V (4.158V to 4.242V), and the pin must withstand the absolute-maximum range of -0.3V to 6V for other pins. |
| 4 | SW | output | Switching node of the synchronous boost converter, rated for an absolute maximum of -0.3V to 10V. |
| 5 | VOUT | power_out | Boost output that supplies 5.1V at up to 500mA load current, with an absolute maximum rating of -0.3V to 8V. |
| 6 | EN | input | Boost enable control: the output turns on above 0.9V (EN_ON) and turns off below 0.8V (EN_OFF), and pulling EN low fully shuts down the output; the pin draws 0.01uA at EN=5V. |
| 7 | CHRG | output | Charge-status indicator output that sinks about 10mA when charging (strong pull-down) and goes high-impedance when charge is complete or when VIN is below 4.5V or above the OVP threshold. |
| 8 | NTC | input | Battery temperature sense input fed by an internal 47uA current source through an NTC to GND; charge current is 100% between VNTC-L (0.165V) and VNTC-M (0.75V), 50% between VNTC-M and VNTC-H (1.15V), and charging is disabled outside the VNTC-L to VNTC-H window. |
| 9 | GND | power_in | Ground, printed on the datasheet as the exposed thermal pad (PAD) of the ESOP-8 package. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | LOWPOWER |
| Package | ESOP-8 |
| Category | Power Management (PMIC) |
| Pins | 9 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| VIN input voltage (absolute maximum) | VIN | -0.3 |  | 36 | V |  | 3 |
| SW pin voltage (absolute maximum) | SW | -0.3 |  | 10 | V |  | 3 |
| VOUT pin voltage (absolute maximum) | VOUT | -0.3 |  | 8 | V |  | 3 |
| Other pins voltage (absolute maximum) |  | -0.3 |  | 6 | V |  | 3 |
| Maximum soldering temperature |  |  |  | 260 | °C | 10 s | 3 |
| Storage temperature |  | -55 |  | 150 | °C |  | 3 |
| Maximum junction temperature |  |  |  | 150 | °C |  | 3 |
| Maximum package power dissipation |  |  |  | 2 | W |  | 3 |
| ESD human body model (HBM) |  |  |  | 2 | KV |  | 3 |
| ESD machine model (MM) |  |  |  | 200 | V |  | 3 |
| Operating ambient temperature range |  | -20 |  | 80 | °C |  | 3 |
| Input operating voltage | VIN | 4.5 |  | 5.8 | V |  | 4 |
| Battery full charge (float) voltage | VFLOAT | 4.158 | 4.2 | 4.242 | V |  | 4 |
| Thermal resistance (温升) |  |  | 50 |  | °C/W |  | 3 |

## CAD (KiCad official)

- Symbol: `LP7801SPF`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`
- 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files: `lp7801spf-etched.step` / `lp7801spf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lp7801spf.step` / `lp7801spf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [LOWPOWER datasheet](https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588912492021469184) (7 pp, sha256 `0e9c93f189a76b3f`, retrieved 2026-10-19, 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:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-haiku-5-5` (text), consensus `claude-sonnet-5-5` (agreed), 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/lp7801spf-datasheet.pdf)