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PSC2945
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Shanghai Prisemi Elec Battery Management, QFN-24L(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownPSC2945
Shanghai Prisemi Elec · Battery Management · QFN-24L(4x4)
PSC2945 from Shanghai Prisemi Elec, in a QFN-24L(4x4). 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 | NC | unconnected | No internal connection; leave this pin unconnected. |
| 2 | DP | bidirectional | Positive data-port for the USB transceiver (labelled D+ in the pin-configuration figure). |
| 3 | DM | bidirectional | Negative data-port for the USB transceiver (labelled D- in the pin-configuration figure). |
| 4 | STAT | output | Open-drain charge status output that indicates charger status, and reads HIGH when charging is disabled. |
| 5 | SCL | input | I2C interface clock input that must be pulled up to the logic rail through a 10 kΩ resistor. |
| 6 | SDA | bidirectional | I2C interface data line that must be pulled up to the logic rail through a 10 kΩ resistor. |
| 7 | INT | output | Open-drain interrupt output that sends a pulse to the host to report charger status and faults. |
| 8 | NC | unconnected | No internal connection; leave this pin unconnected. |
| 9 | CEB | input | Active-low charge enable input: charging is enabled when driven low and charging plus the VSYS regulator are disabled when high. |
| 10 | NC | unconnected | No internal connection; leave this pin unconnected. |
| 11 | TS | input | Temperature qualification voltage input; connect an NTC thermistor between TS and GND (103AT-2 preferred). |
| 12 | QONB | bidirectional | BATFET enable/reset control input with internal pull-up; holding it low for about 430 ms turns on BATFET and exits ship mode. |
| 13 | VBAT | power_in | Battery connection to the positive terminal of the battery pack, with the internal Q4 MOSFET between VBAT and VSYS; connect 22 µF x2 close to this pin. |
| 14 | VBAT | power_in | Battery connection to the positive terminal of the battery pack, with the internal Q4 MOSFET between VBAT and VSYS; connect 22 µF x2 close to this pin. |
| 15 | VSYS | power_out | System power supply output; connect 22 µF x2 close to the VBAT pin per the datasheet. |
| 16 | VSYS | power_out | System power supply output; connect 22 µF x2 close to the VBAT pin per the datasheet. |
| 17 | GND | power_in | Power ground for the high-current converter node, to be connected directly to the input and output capacitor grounds with a single-point connection to analog GND. |
| 18 | GND | power_in | Power ground for the high-current converter node, to be connected directly to the input and output capacitor grounds with a single-point connection to analog GND. |
| 19 | SW | output | Switching node connected to the output inductor, internally tied to the high-side NMOS source and low-side NMOS drain. |
| 20 | SW | output | Switching node connected to the output inductor, internally tied to the high-side NMOS source and low-side NMOS drain. |
| 21 | BTST | power_out | Positive supply for the PWM high-side driver, connected internally to the anode of the bootstrap diode. |
| 22 | REGN | power_out | PWM low-side driver positive supply output, connected internally to the cathode of the bootstrap diode. |
| 23 | PMID | power_out | Input to the charge regulator; connect a 22 µF ceramic capacitor from PMID to analog GND. |
| 24 | VBUS | power_in | Charger input voltage; place a 1 µF ceramic capacitor from VBUS to GND as close to the IC as possible. |
| 25 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | Shanghai Prisemi Elec |
| Package | QFN-24L(4x4) |
| Category | Power Management (PMIC) |
| Pins | 25 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Absolute Maximum Input Voltage | 20 | V | 2 | ||||
| Maximum Input Operating Voltage | 13.9 | V | 2 | ||||
| Input voltage source range | 3.5 | 12 | V | Supports 3.5-12V input voltage sources, including standard USB host port and USB charging port | 1 | ||
| Minimum system voltage (programmable) | 3.55 | V | System regulated slightly above battery voltage, does not drop below minimum system voltage | 1 | |||
| Charge Voltage Accuracy | -0.5 | 0.5 | % | 25℃ | 2 | ||
| Charge Current Regulation Accuracy | -7.5 | 7.5 | % | 2 | |||
| Fast-charge mode charging current | 3 | A | Fully integrated switch-mode charger, Mode 3A Charger | 2 | |||
| Battery discharge MOSFET resistance | 25 | mΩ | 25mΩ Battery Discharge MOSFET (printed as a feature; no typ/max label) | 2 | |||
| Battery leakage current in ship mode | 10 | µA | Low battery leakage current to support ship mode (printed as a feature; no typ/max label) | 2 | |||
| Battery leakage current in standby mode | 12 | µA | Low battery leakage current in standby mode (printed as a feature; no typ/max label) | 2 | |||
| USB OTG boost output voltage | 5 | V | 5V, 2A Boost Mode for USB OTG | 2 | |||
| USB OTG boost output current | 2 | A | 5V, 2A Boost Mode for USB OTG | 2 | |||
| External inductor value | 1 | 2.2 | µH | Small footprint 1-2.2μH external inductor | 2 | ||
| VBUS input capacitor | 1 | µF | Ceramic capacitor from VBUS to GND, placed as close as possible to IC | 3 | |||
| PMID input capacitor | 22 | µF | Ceramic capacitor from PMID to analog GND | 4 | |||
| QONB pull-down time to turn on BATFET and exit ship mode | 430 | ms | Pull down QONB for about 430ms | 4 |
CAD (KiCad official)
- Symbol:
PSC2945 - Footprint:
Package_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.7x2.7mm - 3D model: QFN-24L(4x4) (KiCad packages3D, STEP)
- 3D model files:
psc2945-etched.step/psc2945-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);psc2945.step/psc2945.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: Shanghai Prisemi Elec datasheet (6 pp, sha256
49022ed5b6488a91, retrieved 2026-10-18, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-haiku-5-5(text), consensusclaude-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).