Texas Instruments BMS027, User Manual

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Introduction
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2 SLUUC51A – June 2020 – Revised July 2020
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BQ25790EVM (BMS027) Evaluation Module User's Guide
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1 Introduction
The BQ25790 is an integrated switched-mode buck-boost battery charge management device in WCSP
package, intended for 1- to 4-series cell Li-ion and Li-polymer batteries. The charger features a narrow
VDC architecture (NVDC) which allows the system to be regulated to a minimum value even if the battery
is completely discharged. Additionally, the BQ25790 supports input source detection through D+ and D-
which is compatible with USB2.0, USB3.0 power delivery, non-standard adapters and many high voltage
adapters. With dual input source selection, USB OTG support and an integrated 16-bit multi-channel
analog-to-digital converter (ADC), the BQ25790 is a complete charging solution.
1.1 EVM Features
The BQ25790EVM is a complete module for evaluating the BQ25790 in the (WCSP) DSBGA package.
Key features of this EVM include:
• Synchronous Switch Mode Buck-Boost Charger for 1s-4s Battery Configuration for 5-A Charging with
10-mA Resolution
• Support for 3.6-V to 24-V Wide Range of Input Sources USB Auto-Detect, USB PD and Wireless Input
• Dual Input Source Selector to Drive Bi-Directional Blocking NFETs
• Power up USB Port from Battery (USB OTG) with 2.8-V to 22-V OTG Output Voltage with 10-mV
Resolution
• Low Battery Quiescent Current < 1 µA in Shutdown Mode
The device datasheet, listed in Table 1 , provides detailed features and operation.
Table 1. Device Data Sheet
Device Data Sheet
BQ25790 SLUSDF9
1.2 I/O Descriptions
Table 2 lists the BQ25790EVM board connections and ports.
Table 2. EVM Connections
Connector/Port Description
J1 VIN1 Positive rail of the priority input adapter or power supply
GND Ground
J2 VIN2 Positive rail of the secondary input adapter or power supply
GND Ground
J3 SYSTEM Positive rail of the charger system output voltage, typically connected to the system load
GND Ground
J4 VPMID Positive rail of the charger output voltage for reverse mode (OTG). This output also shares
the rail with VBUS in forward mode
GND Ground
J5 BATTERY Positive rail of the charger battery input
SNS_BATP Input connected to the positive terminal of the battery for remote battery voltage
measurement
SNS_BATN Input connected to the negative terminal of the battery for remote battery voltage
measurement
GND Ground
J6 USB port USB Micro B port used for input source type detection and handshaking. Connected to
either VIN1 or VIN2