# LP28303ASPF

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

LP28303ASPF 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 | CHRG | output | Open-drain charge status output that is pulled low by an internal N-channel MOSFET while the battery is charging, and is high impedance in shutdown. |
| 2 | FULL | output | Open-drain charge status output that is pulled low by an internal N-channel MOSFET when charging is complete (VFULL is 0.5V maximum at IFULL = 5mA). |
| 3 | NTC | input | Negative temperature coefficient thermistor input that senses battery pack temperature and stops the charger when the temperature is out of range; connect to GND to disable this function. |
| 4 | VBAT | power_out | Battery pin, regulated to the 4.2V float voltage (VFLOAT 4.158V to 4.242V). |
| 5 | CS | input | Current sense pin; the charge current is set as IBAT = 50mV / RCS using the external sense resistor RCS. |
| 6 | SW | output | Switch pin that connects to the external inductor; switch rise and fall times are kept under 5ns per the layout guidance. |
| 7 | AGND | power_in | Analog (signal) ground. |
| 8 | VIN | power_in | Positive supply voltage input, specified 4.5V to 5.5V, to be decoupled with a 10µF or larger surface mounted ceramic capacitor. |
| 9 | PGND | power_in | Power ground on the exposed pad, which must be connected to the ground plane for proper power dissipation. |

## 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 pin to GND |  |  |  | 7 | V |  | 3 |
| VBAT pin to GND |  |  |  | 7 | V |  | 3 |
| Other pin to GND |  |  |  | 7 | V |  | 3 |
| Maximum Junction Temperature |  |  |  | 150 | ℃ |  | 3 |
| Operating Ambient Temperature Range (TA) | TA | -20 |  | 85 | ℃ |  | 3 |
| Maximum Soldering Temperature |  |  |  | 260 | ℃ | at leads, 10 sec | 3 |
| Ambient Temperature Range | TA | -20 |  | 85 | ℃ |  | 3 |
| Maximum Power Dissipation (ESOP8) | PD |  |  | 2 | W | TA=25℃ | 3 |
| VIN Adapter/USB Voltage Range | VIN | 4.5 |  | 5.5 | V |  | 4 |
| Regulated Output (Float) Voltage | VFLOAT | 4.158 | 4.2 | 4.242 | V |  | 4 |
| Input Supply Current, Standby Mode (Charge Terminated) | ICC |  | 0.1 |  | mA | Standby Mode (Charge Terminated) | 4 |
| Current Sense Reference Voltage (For CS to BAT) | VCS |  | 50 |  | mV | VTRIKL<VBAT<VFLOAT | 4 |
| BAT Pin Current | IBAT |  | 1000 |  | mA | Rcs=50mΩ, Current Mode | 4 |
| BAT Pin Current | IBAT |  | 2000 |  | mA | Rcs=25mΩ, Current Mode | 4 |
| BAT Pin Current, Standby Mode | IBAT |  | 7 |  | μA | Standby Mode | 4 |
| Trickle Charge Current | ITRIKL |  | 100 |  | mA | 1V<VBAT<VTRIKL, RCS=50mΩ | 4 |
| Trickle Charge Current | ITRIKL |  | 20 |  | mA | VBAT<1V, RCS=50mΩ | 4 |
| Trickle Charge Threshold Voltage | VTRIKL |  | 2.8 |  | V | RCS=50mΩ, VBAT Rising | 4 |
| Trickle Charge Hysteresis Voltage | VTRHYS |  | 100 |  | mV | RCS=50mΩ | 4 |
| Input Regulation Voltage | VREG |  | 4.3 |  | V |  | 4 |
| CHRG Pin Output Low Voltage | VCHRG |  | 0.5 |  | V | ICHRG=5mA | 4 |
| FULL Pin Output Low Voltage | VFULL |  | 0.5 |  | V | IFULL=5mA | 4 |
| Recharge Threshold Voltage | ΔVRECHRG |  | 150 |  | mV | VFLOAT-VRECHRG | 4 |
| Junction Temperature in Constant Temperature Mode | TLIM |  | 150 |  | ℃ |  | 4 |
| C/10 Terminal Current | ITERM |  | 100 |  | mA | RCS=50mΩ | 4 |
| Under Voltage Lockout of VIN, rising | UVLO |  | 4.1 |  | V | VIN rising | 4 |
| Under Voltage Lockout of VIN, falling | UVLO |  | 3.9 |  | V | VIN falling | 4 |
| Over Voltage Protection of VIN, rising | VOVP |  | 6 |  | V | VIN rising | 4 |
| Over Voltage Protection of VIN, falling | VOVP |  | 5.7 |  | V | VIN falling | 4 |
| Switch Frequency | FOSC |  | 600 |  | KHz | VIN=5V, Current Mode | 4 |
| Protection Threshold Voltage of VNTC, rising | VNTC |  | 80 |  | %VIN | VNTC rising | 4 |
| Protection Threshold Voltage of VNTC, falling | VNTC |  | 45 |  | %VIN | VNTC falling | 4 |
| NTC Disable Voltage |  |  | 100 |  | mV |  | 4 |
| Thermal Resistance (ESOP8) | θJA |  | 50 |  | ℃/W |  | 3 |

## CAD (KiCad official)

- Symbol: `LP28303ASPF`
- Footprint: `Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm`
- 3D model: ESOP-8 (KiCad packages3D, STEP)
- 3D model files: `lp28303aspf-etched.step` / `lp28303aspf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lp28303aspf.step` / `lp28303aspf.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/8588912947930812417) (8 pp, sha256 `f160b4d8c7d33918`, retrieved 2026-10-18, tier: lcsc)
- **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/lp28303aspf-datasheet.pdf)