# LP28400AQVF

**LOWPOWER** · Battery Management ICs · QFN-16-EP(3x3)

LP28400AQVF from LOWPOWER, in a QFN-16-EP(3x3). 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 | PB | output | Gate control signal for the external pass transistor, also the compensation node for Boost. |
| 2 | EN | input | Enable pin, active high (chip enable VEN(ON) 1.4V, shutdown VEN(OFF) 0.4V). |
| 3 | VIN | power_in | Power input, 3V~12V operating range, absolute maximum 18V. |
| 4 | VL | power_out | Internal LDO output (5V typ); connect a 4.7uF decoupling capacitor to GNDP. |
| 5 | LG | output | Low side gate driver for the outside power MOSFET. |
| 6 | LX | passive | Switching node connection, absolute maximum 18V. |
| 7 | GNDP | power_in | Ground for the power section. |
| 8 | GNDA | power_in | Ground for the analog circuits. |
| 9 | THM | input | Thermistor input; charging inhibited if VTHM<0.28*V(VL) or VTHM>0.74*V(VL), normal operation between. |
| 10 | FULL | output | Battery full indication pin, active low. |
| 11 | STAT | output | Indicates charge status, active low when charging is on (open drain). |
| 12 | REG | input | Input voltage feedback for the input voltage regulation loop (reference 1V typ). |
| 13 | VB | power_in | Programmable battery-full voltage: connect to GND for 8.8V, float for 8.4V, connect to VL for 8.7V. |
| 14 | CELLS | input | Cell selection: connect to GND for 3 cells, float for 2 cells, connect to VL for 4 cells. |
| 15 | RS | input | Charge current sense input (with VBAT across RSENSE); indicates charging terminated. |
| 16 | VBAT | power_in | Sense pin for battery voltage. |
| 17 | GNDP | power_in | Exposed pad, ground for the power section. |

## Key specifications

| Parameter | Value |
|---|---|
| Manufacturer | LOWPOWER |
| Package | QFN-16-EP(3x3) |
| Category | Power Management ICs |
| Pins | 17 |

## Electrical characteristics

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

| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Internal LDO output | V(VL) | 4.9 | 5 | 5.1 | V | VIN=6V | 5 |
| Input voltage regulation reference | VREG | 0.95 | 1 | 1.05 | V |  | 5 |
| Program charging current sense voltage | V(RS,VBAT) | 47.5 | 50 | 52.5 | mV | From Rs to VBAT | 5 |
| Thermal protection |  | 135 | 145 | 155 | C | Not tested in production | 5 |
| UVLO input voltage threshold | VIN |  | 2.65 |  | V | VIN increasing | 5 |
| UVLO hysteresis | VIN |  | 150 |  | mV | VIN decaying | 5 |
| Quiescent current | IQ |  |  | 1 | mA |  | 5 |
| Battery leakage current | IBAT |  |  | -10 | uA | VBAT=8.4V, VIN=NC | 5 |
| Battery leakage current | IBAT |  |  | -35 | uA | VBAT=8.4V, VIN=5V | 5 |
| Charge current limit | IBATLIMIT |  | 1.5 |  | A | VIN=5V | 5 |
| CV voltage | V(VBAT) |  | 8.4 |  | V |  | 5 |
| Recharge threshold | V(VBAT) |  | 300 |  | mV |  | 5 |
| End of charge threshold | V(RS,VBAT) |  | 5 |  | mV | From Rs to VBAT | 5 |
| Trickle charge voltage threshold | V(VBAT) |  | 6 |  | V |  | 5 |
| Trickle charge current | V(RS,VBAT) |  | 10 |  | mV | From Rs to VBAT | 5 |
| Switching frequency | LX |  | 1 |  | MHz |  | 5 |
| Chip enable | VEN(ON) | 1.4 |  |  | V |  | 5 |
| Chip shutdown | VEN(OFF) |  |  | 0.4 | V |  | 5 |
| STAT low level | STAT |  |  | 0.2 | V | Open drain pulled up with 5mA | 5 |
| Low side Rdson | R(LX,GND) |  | 60 |  | mΩ | From LX to GND | 5 |
| Maximum voltage VIN, LX, RS, VBAT, PB to GND |  | -0.3 |  | 18 | V |  | 4 |
| Maximum voltage VL to GND |  | -0.3 |  | 6 | V |  | 4 |
| Maximum voltage REG, STAT to GND |  | -0.3 |  |  | V | max is VL+0.3V | 4 |
| Maximum junction temperature |  |  |  | 150 | °C |  | 4 |
| Operating junction temperature range | TJ | -40 |  | 85 | °C |  | 4 |
| Maximum soldering temperature |  |  |  | 260 | °C | at leads, 10 sec | 4 |
| ESD HBM |  |  |  | 2 | kV |  | 4 |
| ESD MM |  |  |  | 200 | V |  | 4 |
| Input voltage range | VIN | 3 |  | 12 | V |  | 1 |

## CAD (KiCad official)

- Symbol: `LP28400AQVF`
- Footprint: `Package_DFN_QFN:QFN-16-1EP_3x3mm_P0.5mm_EP1.7x1.7mm`
- 3D model: QFN-16-EP(3x3) (KiCad packages3D, STEP)
- 3D model files: `lp28400aqvf-etched.step` / `lp28400aqvf-etched.glb` carry the MPN laser-etched on the die in a toggleable `Adom.LaserEtch` group (Fusion-ready); `lp28400aqvf.step` / `lp28400aqvf.glb` are the bare package body.

## Provenance

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

- **Datasheet:** [LOWPOWER datasheet](docs/lp28400aqvf-datasheet.pdf) (10 pp, sha256 `34513366435206d0`, retrieved 2026-10-22, tier: lcsc)
- **Extractor:** parts-factory `2.0.0` / `extract_pins 0.3`, primary `claude-sonnet-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/lp28400aqvf-datasheet.pdf)