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ZSPM4521 - Application Circuit
ZSPM4521 - Block Diagram
ZSPM4521 - Pinout

ZSPM4521

High-Efficiency Charger for Li-Ion Batteries with Photovoltaic Sources

The ZSPM4521 is a DC/DC synchronous switching lithium-ion (Li-Ion) battery charger with fully integrated power switches, internal compensation, and full fault protection. It uses a temperature-independent photovoltaic maximum power point tracking (MPPT) function to optimize power output from the source during Full-Charge Constant-Current (CC) Mode. Its switching frequency of 1MHz enables the use of small filter components, resulting in smaller board space and reduced bill-of material costs. During Full-Charge Constant-Current Mode, the duty cycle is controlled by the MPPT regulator. Once the battery’s termination voltage is reached, the regulator operates in Constant Voltage Mode. In this mode, the ZSPM4521 modulates the charging current until the battery reaches full charge. When the regulator is disabled (the EN pin is low), the device draws 10µA (typical) quiescent current (Disabled Mode). The ZSPM4521 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.

Features

  • Temperature-independent photovoltaic maximum power tracking (MPPT) regulator
  • VBAT reverse-current blocking
  • Programmable temperature-compensated termination voltage: 3.94V to 4.18V ± 1%
  • User-programmable maximum charge current: 50mA to 1500mA
  • Supervisor for VBAT reported at the NFLT pin
  • Input supply under-voltage lockout
  • Full protection for VBAT over-current, over-temperature, VBAT over-voltage, and charging timeout
  • Charge status indication
  • I2C program interface with EEPROM registers

Product Specification

FunctionAdvanced FeaturesOutput Current Max (A)Input Voltage Range (V)
Li-ion ChargerMPPT Regulator1.54.00 - 7.20

Product Options

Orderable Part IDPart StatusPkg. CodePkg. TypeLead Count (#)Temp. RangeCarrier TypeSample & Buy
ZSPM4521AA1RActiveNBG16VFQFPN16-40 to 125°CReelCheck Availability

Documents

Technical Documentation

Title Type Format File Size Datesort icon
Datasheets & Errata
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ZSPM4521 Datasheet Datasheet PDF 464 KB Jan 27, 2016
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ZSPM4521 Short-form Datasheet Short Form Datasheet PDF 47 KB Jan 27, 2016
User Guides & Manuals
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ZSPM4521 Evaluation Kit Description Manual PDF 777 KB Apr 21, 2016
Apps Notes & White Papers
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ZSPM4521 / ZSPM4523 Application Note - Charging Solutions for Li-ion Batteries or Super Capacitors using Photovoltaic Sources Application Note PDF 113 KB Apr 21, 2016
Other
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IDT CAD Altium Libraries for AID Products Rev 20160819 PCB Design Files ZIP 1.20 MB Aug 19, 2016

Software & Tools

Title Type Format File Size Datesort icon
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ZSPM45XX Evaluation Kit Software Setup V1.020 (zip) Software ZIP 935 KB Apr 8, 2016

Evaluation Boards