BQ24200EVM

BQ24200EVM Features

�Performance evaluation of a charge-management solution for portableapplications using the bq2420x product family�Complete designed-and-tested charger�Integrated powerFET�High-accuracy voltage regulation�Temperature monitoring�Charge status reporting�Charge termination�Up to 500 mA of continuous charge current for single-cell Li-Ion or Li-Polapplications using a current-limited power supplyKit Contents1-3Introduction

BQ24200EVM Introduction

This user’s guide describes the bq2420x evaluation module (SLUP141),which conveniently evaluates a charge-management solution for portableapplications using the bq2420x product family. This complete, designed-and-tested charger delivers up to 500 mA of continuous charge current forsingle-cell Li-Ion or Li-Pol applications using a current-limited power supply.TopicPage1.1Background1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.2Features1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.3Kit Contents1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1.4Performance Specification Summary1-3. . . . . . . . . . . . . . . . . . . . . . . . . . .1.5Ordering Information1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .Chapter 1Background1-21.1BackgroundThe bq2420x series are simple Li-Ion linear charge management devices forlow-cost and space-limited charger applications. The bq2420x series offerintegrated power FET, high-accuracy voltage regulation, temperaturemonitoring, charge status, and charge termination—all in a single IC.The bq2420x works with a current-limited, wall-mount transformer andtherefore does not provide any current regulation. However, these devicesoffer a fixed internal current limit to prevent damage to the internal powerFET.A time-limited preconditioning phase conditions deeply discharged cells.Once the battery reaches the charge voltage, the voltage-regulation looptakes over and completes the charge cycle. Charge is terminated on the basisof minimum current. An internal charge timer provides a backup safety forcharge termination.Other standard features include an automatic sleep mode activated when Vccfalls below the battery voltage and a recharge feature activated when thebattery voltage falls below the VRCH threshold.In addition to the standard features, the core product provides two additionalenhancements: temperature monitoring and status display. The temperature-sense circuit continuously measures battery temperature using an externalthermistor and inhibits charge until the battery temperature is within theuser-defined thresholds. The STAT pin indicates three conditions of chargeroperation: charge-in-progress, charge complete, and fault. This output can beused to drive an LED or to interface with a microcontroller.1.2Features�Performance evaluation of a charge-management solution for portableapplications using the bq2420x product family�Complete designed-and-tested charger�Integrated powerFET�High-accuracy voltage regulation�Temperature monitoring�Charge status reporting�Charge termination�Up to 500 mA of continuous charge current for single-cell Li-Ion or Li-Polapplications using a current-limited power supplyKit Contents1-3Introduction1.3Kit Contents�bq242xx evaluation module (SLUP141)�Set of support documentation1.4Performance Specification SummaryThis section summarizes the performance specifications of the EVM.Table 1–1 gives the performance specifications of the EVM.Table 1–1.Performance Specification SummarySpecificationTest ConditionsMinTypMaxUnitInput dc voltage, VDCVREG +0.813.5VBattery charge current, ICHGSee Note0.40.50.6AmpsBattery voltage regulation, VREGFull battery4.10VBattery voltage regulation, VREGFull battery4.20VPower dissipation, PD(Vin–Vout) × Iload1.0WNote:Battery charge current must be limited by the external supply.1.5Ordering InformationTable 1–2.Feature Sets of the bq2420x FamilyFunctionsPart NumberPackageSTATTempSenseRegulationVoltagebq24200DGNDGN—8 PinXX4.2 Vbq24201DGNDGN—8 PinXX4.1 Vbq24202DGNDGN—8 PinX4.2 Vbq24203DGNDGN—8 PinX4.1 Vbq24204DGNDGN—8 Pin4.2 Vbq24205DGNDGN—8 Pin4.1 V1-42-1Test Summary