Texas Instruments BQ25886, User Manual

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Introduction
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2 SLUUC11 – February 2019
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Copyright © 2019, Texas Instruments Incorporated
BQ25886 QFN Standalone boost-mode battery charger evaluation module
Advance Information
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1 Introduction
As industry improvements continue to make portable electronics more powerful, their power requirements
increase. Using two series Li-Ion polymer cells is one way to achieve this power increase. Charging these
8.4-V battery packs from a legacy 5-V USB port requires a boost charger. The BQ25886 is a highly-
integrated 2-A boosting, 1.5-MHz switch-mode battery charge management device for a 2s Li-Ion and Li-
polymer battery. BQ25886 is the standalone solution which device can operate without the need of a host.
1.1 EVM Features
The BQ25886 QFN evaluation module (EVM) is a complete charger module for evaluating the standalone,
2s battery NVDC charger in the QFN package. Key features of this EVM include:
• Easily evaluate the high-efficiency 2-A, 1.5-MHz integrated field-effect-transistor (FET), switch-mode
boost charger in the QFN package
• Use of an onboard USB input adapter for connecting to a USB source and either communication
through D+/D– to set the default input current limit
• Onboard test points, sense resistors, and jumpers facilitate measurement of high-efficiency- and high-
accuracy voltage and current regulation
See the device data sheet ( Table 1 ) for detailed features and operation of the integrated circuit (IC).
Table 1. Device Data Sheets
Device Data Sheet EVM Label Variant
BQ25886 SLUSDE6 BQ25886EVM-002 002
1.2 I/O Descriptions
Table 2 lists the jumper connections available on this EVM.
Table 2. EVM Connections
Jack Description
J1(2)–VBUS Connection for positive terminal of charger power source
J1(1)–GND Connection for negative terminal (ground terminal) of charger power source
J2(1)–SYS Connection to system load
J2(2)–GND Ground
J3(1)–PMID PMID pin connection
J3(2)–GND Ground
J4(1)–BAT+ Connection for battery pack positive node to BAT pin
J4(2)-TOP-
/BOT+
Connection for the mid connection point of the top and bottom cell (BQ25887only. Do
not use for BQ25883 or BQ25886)
J5(1)–GND Connection to battery pack negative node = EVM ground
J5(2)–TS Connection for the NTC thermistor
J6 I
2
C 4-pin connector for EV2400
J7 Input mini-USB port
lists the EVM jumper connections.