Details, datasheet, quote on part number: BQ24078EVM-015
PartBQ24078EVM-015
CategoryEmbedded Solutions => Engineering Tools => 8846141
TitlePower Management IC Development Tools BQ24078EVM-015
DescriptionTexas Instruments bq24076EVM/bq24078EVM Evaluation Modules (EVMs) provides a convenient method for evaluating the performance of a charge management and system power solution for portable applications using the bq24076 or bq24078 products. Each of these chargers is designed to deliver up to 1.5A of continuous current to the system or charger for one-cell Li-ion or Li-polymer applications using a dc power supply. The charger is programmed from the factory to deliver 0.9A of charging current. Each of these evaluation modules was designed as a stand-alone evaluation module, but they can also be interfaced with the system and host via the connectors and headers.
CompanyTexas Instruments Inc.
DatasheetDownload BQ24078EVM-015 datasheet
Specifications 
ProductEvaluation Modules
TypeBattery Management
Tool Is For Evaluation OfBQ24078
Input Voltage4.75 V to 6.5 V
Output Voltage4.35 V
BQ24078EVM-015 photo

Others parts numbering
BQ24076EVM-015: Power Management IC Development Tools BQ24076EVM-015

 

Features, Applications

This user's guide describes the bq24076 and bq24078 (hereafter, bq24076/8) evaluation module (EVM). The EVM provides a convenient method for evaluating the performance of a charge management and system power solution for portable applications using the bq24076/8 product families. A completely designed and tested module is presented. The charger is designed to deliver A of continuous current to the system or charger for one-cell Li-ion or Li-polymer applications (see the data sheet for correct device) using a DC power supply. The charger is programmed from the factory to deliver A of charging current. This EVM was designed as a stand-alone evaluation module, but it also can be interfaced with the system and host via the connectors and headers.

Contents Introduction................................................................................................................... 2 Considerations When Testing and Using bq24076/8 ICs.............................................................. 2 Performance Specification Summary..................................................................................... 3 Test Summary................................................................................................................ 4 Schematic..................................................................................................................... 8 Physical Layouts............................................................................................................. 9 Bill of Materials............................................................................................................. 11 References.................................................................................................................. 11 List of Figures Test Diagram................................................................................................................. 4 Modes of Operation Tested in Steps 11 Through 13................................................................... 6 Charger Profile With EN1 = VSS and EN2 = HI, Programmed by ISET............................................. 6 Charge Enabled, Pulled High, Then Low Disables Charge.......................................................... 7 Schematic..................................................................................................................... 8

9 Board Layout Top Etch Layer.......................................................................................... 10 Board Layout Bottom Etch Layer...................................................................................... 10

Top Assembly View List of Tables Ordering Information

Performance Specification Summary for bq24076/8 EVMs............................................................ 4 BMS015 Bill of Materials.................................................................................................. 11

The bq24076/8 powers the system while independently charging the battery. This feature reduces the charge and discharge cycles on the battery, allows for proper charge termination, and allows the system to run with an absent or defective battery pack. This feature also allows for the system to instantaneously turn on from an external power source even when using a deeply discharged battery pack. This charger has one input and can be programmed to be used with an adapter or USB port as the power source for the system. In the USB configuration, the host can select from the two preset input maximum rates 100 mA and 500 mA. The charger dynamically adjusts the charge rate based on the system load to stay within the or 500-mA maximum limits. An external resistor, RSET1, sets the magnitude of the charge current. If the charge current exceeds the available input current, the voltage on the OUT pin drops to the DPPM threshold or the battery voltage, whichever is higher. The charging current is reduced to what current is available (IBAT = IIN IOUT). The integrated circuit (IC) charges the battery in three phases: conditioning, constant current, and constant voltage. Charge is terminated based on minimum current. A resistor-programmable charge timer provides a backup safety for charge termination. The charge automatically re-starts if the battery voltage falls below an internal threshold. Sleep mode is entered when the supply is removed (VIN drops to the battery voltage).

The bq24076/8 series targets current above a nominal mA 350 mA) and the differences are listed in Table 1. Table 1. Ordering Information

Part Number bq24076RGTR bq24078RGTR VOVP 6.6 V VBAT 4.35 V VOUT(REG) VBAT 210 mV VBAT 210 mV VDPM VBAT 100 mV VBAT 100 mV Marking CDU ODI

The bq24076/8 are suited for headset designs. The pinout of each IC is the same. The two potential sources to power the system (VOUT) are the input source and the battery (adapter or USB port). The IC is designed to power the system continuously. The battery, in most cases, is the last line of backup. If the adapter or USB input is not available (or disabled), the battery connects to the system. In thermal regulation condition (TJ = 125C not a first-choice design mode of operation), the charge current is reduced to the battery, and the system still gets its power from the input. The battery supplement is available in thermal regulation if the VOUT falls to VBAT. In thermal cutoff (approximately 155C), the input sources are disconnected, but the internal battery FET connects the battery to VOUT.

Table 2 summarizes the performance specifications of the EVM. Table 2. Performance Specification Summary for bq24076/8 EVMs

Specification Test Conditions MIN 4.75 TYP 5 1 Pdiss = (VIN VOUT)IOUT + (VIN VBAT)IBAT See MAX 6.5 1.5

Input DC Voltage, VI(AC) Battery Charge Current, IO(CHG) Power Dissipation, bq24076/8 IC, 1 Cell

The BMS015 (bq24076/8) thermal design is optimized (8+ vias, 0.031-inch PCB, 2-oz. copper) to give JA approximately 27C/W.

This is a linear battery charger and also powers the system from the input via the linear regulator output. The key here is that this is a linear device that is most efficient when the input voltage is not too far above the battery voltage (VIN to 5.5 V). Input voltage that is too low (less than the OUT voltage plus the dropout voltage) results in degraded performance. Excessive input voltage 5.5 V) results in excess power dissipation and reduced performance via thermal regulation. The IC is rated 28 V, and will not be damaged with VIN voltages less than this, but any VIN voltage over the overvoltage protection (OVP) threshold disables the IC. Thus, the recommended operating range for maximum performance is between 4.75 V and 5.5 V, with a preference toward the lower values.


 

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