PSC2945 Overview
The Prisemi PSC2945 is a highly integrated, single-cell Lithium-ion (Li-ion) and Lithium-polymer battery charger IC that combines a switch-mode charging front end with an integrated boost regulator, enabling bidirectional power management from a single compact device. Designed primarily for USB-powered applications, the PSC2945 minimises charge time through its low-impedance power path, which optimises switch-mode efficiency during both the charging and discharging phases. The device supports input voltages from 3.2V to 12V, encompassing standard USB host ports, USB charging ports (including USB-PD compatible adapters), and other DC sources, with programmable over-voltage protection providing robust system protection.
A key differentiator of the PSC2945 is its I²C serial interface, which allows designers to dynamically configure charging current, system voltage thresholds, and protection settings in firmware — making it a truly flexible platform for a wide range of portable and IoT product designs. The integrated boost converter enables the PSC2945 to power a connected USB peripheral directly from the battery via VBUS, supporting USB On-the-Go (OTG) operation with accurate, programmable current limiting. With a quiescent current of just 10µA, the device is optimised for always-on and low-standby-power applications where battery runtime is critical. The QFN-24L (4×4mm) package keeps board footprint minimal for space-constrained designs.
Key Specifications
| Parameter | Value |
|---|---|
| Part Number | PSC2945 |
| Manufacturer | Prisemi |
| Operating Input Voltage | 3.2V to 12V |
| Maximum Charge Current (ICharge) | 3A |
| Quiescent Current (Iq) | 10µA |
| Control Interface | I²C |
| Topology | Switch-mode charger + Boost regulator |
| Supported Battery Chemistry | Single-cell Li-ion / Li-polymer |
| USB OTG Support | Yes (programmable VBUS current limit) |
| Over-Voltage Protection | Programmable |
| Package | QFN-24L (4×4mm) |
| RoHS Compliance | Yes |
Applications
The PSC2945 is well suited to any application requiring compact, efficient single-cell Li-ion battery charging from a USB source. Primary application areas include smartphones and feature phones, wireless earbuds and hearables, smartwatches and fitness wearables, portable Bluetooth speakers, and handheld IoT devices. Its USB OTG capability and programmable I²C interface also make it attractive for USB power banks, portable medical monitors, and compact industrial handheld terminals where bidirectional power flow and flexible firmware control are required.
Pin-to-Pin Compatible Alternatives
Specifying a pin-to-pin compatible replacement such as the PSC2945 allows design teams to reduce BOM cost and improve supply chain resilience without requiring PCB layout changes or firmware re-qualification.
| Reference Part Number | Original Manufacturer | Why Choose PSC2945 |
|---|---|---|
| BQ25895 | Texas Instruments | Significant cost reduction with equivalent I²C-controlled switch-mode charging architecture and OTG support |
| MP2696A | MPS (Monolithic Power Systems) | Same QFN footprint; competitive pricing for high-volume consumer electronics production |
| SGM41511 | SGMICRO | Direct functional replacement with broader distributor availability through ABL Semi’s UK supply chain |
| RT9759 | Richtek | Compatible interface and power path architecture; PSC2945 offers lower Iq for improved standby battery life |
| SY6974B | Silergy | Pin-compatible alternative with factory-authenticated supply and compliance-friendly UK trade documentation |
Frequently Asked Questions
Is PSC2945 RoHS compliant?
Yes, the Prisemi PSC2945 is manufactured in compliance with the RoHS Directive (2011/65/EU), restricting the use of hazardous substances including lead, mercury, and cadmium. Compliance documentation is available upon request through ABL Semi.
What are the pin-to-pin replacements for PSC2945?
The PSC2945 is a pin-to-pin compatible alternative to several widely used Li-ion charger ICs, including the TI BQ25895, MPS MP2696A, Richtek RT9759, and Silergy SY6974B. Please refer to the compatibility table above for specific advantages of each substitution.
What is the minimum order quantity (MOQ) for PSC2945?
ABL Semi offers flexible MOQ for PSC2945, supporting both prototype quantities and mass production orders. Contact us for current stock and pricing.
What package options are available for PSC2945?
The PSC2945 is available in a QFN-24L (4×4mm) package. This compact, leadless package is optimised for high-density PCB layouts typical of portable and wearable devices. Contact ABL Semi to confirm current package availability and lead times.
Does PSC2945 support adjustable charge current via I²C?
Yes. The PSC2945 exposes full charging configuration — including charge current, input current limit, voltage thresholds, and protection settings — through its I²C serial interface. This allows host microcontrollers to dynamically adjust charging behaviour at runtime, making it straightforward to implement intelligent charging profiles, thermal throttling, or USB BC1.2 detection responses entirely in firmware without hardware modifications.
For complete product specifications, please refer to: