High-Efficiency Charger for Li-Ion Batteries

The ZSPM4551 is a DC/DC synchronous switching lithium-ion (Li-Ion) battery charger with fully integrated power switches, internal compensation, and full fault protection. Its switching frequency of 1MHz enables the use of small filter components, resulting in smaller board space and reduced BOM cost. In Full-Charge Constant-Current Mode, the regulation is for constant current (CC). Once termination voltage is reached, the regulator operates in voltage mode. When the regulator is disabled (the EN pin is low), the device draws 10µA (typical) quiescent current. The ZSPM4551 includes supervisory reporting through the NFLT (inverted fault) open-drain output to interface other components in the system. Device programming is achieved by an I²C interface through the SCL and SDA pins.


  • VBAT reverse-current blocking
  • Programmable temperature-compensated termination voltage: 3.94V to 4.18V ±1%
  • User programmable maximum charge current: 50mA to 1500mA
  • Current mode PWM control in constant voltage
  • Supervisor for VBAT reported at the NFLT pin
  • Input supply under-voltage lockout
  • Full protection for over-current, over-temperature, VBAT over-voltage, and charging timeout
  • Charge status indication
  • I2C program interface with EEPROM registers

Product Options

Orderable Part ID Part Status Pkg. Code Pkg. Type Lead Count (#) Temp. Range Carrier Type Buy Sample
ZSPM4551AA1R Not Recommended for New Designs NBG16 VFQFPN 16 -40 to 125°C Reel Availability
ZSPM4551AA1W Not Recommended for New Designs NBG16 VFQFPN 16 -40 to 125°C Reel Availability

Technical Documentation

Title Other Languages Type Format File Size Date
Datasheets & Errata
ZSPM4551 Datasheet Datasheet PDF 457 KB Jan 28, 2016
ZSPM4551 Short-form Datasheet Short Form Datasheet PDF 43 KB Jan 28, 2016
User Guides & Manuals
ZSPM4551 Evaluation Kit Description Manual PDF 789 KB Apr 20, 2016
Application Notes & White Papers
ZSPM4551 Application Note – Li-Ion Battery Charging Applications Application Note PDF 92 KB Apr 20, 2016
IDT CAD Altium Libraries for AID Products Rev 20160819 PCB Design Files ZIP 1.20 MB Aug 18, 2016

Software & Tools

Title Other Languages Type Format File Size Date
ZSPM45XX Evaluation Kit Software Setup V1.020 (zip) Software ZIP 935 KB Apr 7, 2016

Evaluation Boards

Part Number Title Sort ascending
ZSPM4551KIT Evaluation Kit for ZSPM4551