1 Introduction
1.1 EVM Features
This EVM supports the following features:
• Evaluation module for the BQ2572x devices
• Supports 3.5- to 26-V input source
– 3.5- to 26-V, 0- to 6-A input operating range and 1–4 cell battery configuration
– Supports USB 2.0, USB 3.0, USB 3.1 (USB Type-C
®
) and USB_PD
– Supports USB OTG with 3- to 26-V adjustable output
– Supports Fast Role Swap (FRS) feature for USB_PD
• Narrow VDC (NVDC) power path management
– Battery supplements the system when the adapter is fully-loaded
• 800-kHz or 1.2-MHz switching frequency for low profile inductor
• SMBus (BQ25720) or I
2
C (BQ25723) port for optimal system performance and status reporting
• Power and current monitor for CPU throttling
• Safety
– Thermal shutdown
– Input and system overvoltage protection
– MOSFET overcurrent protection
• Supports Vmin Active Protection (VAP) mode for Intel
®
platform
• Charge status outputs for LED or host processor
• Maximum power tracking capability by input voltage regulation
• Test points for key signals available for testing purposes. Easy probe hook-up.
• Jumpers available. Easy-to-change connections.
1.2 General Description
The BQ2572x evaluation modules are complete charger modules for evaluating an SMBus or I
2
C-controlled
buck boost charger using the BQ2572x devices.
The BQ2572x EVM does not include the EV2400 interface board. To evaluate the BQ2572x EVM, order an
EV2400 interface board separately.
The BQ2572x is a synchronous NVDC-1 battery buck boost charge controller, offering a low component count,
high efficiency solution for space-constrained, multi-chemistry battery charging applications.
The NVDC-1 configuration allows the system to be regulated at the battery voltage, but does not drop below
the system minimum voltage. The system keeps operating even when the battery is completely discharged or
removed. When load power exceeds the input source rating, the battery supplement mode prevents the input
source from being overloaded.
The BQ2572x charges the battery from a wide range of input sources including a 5-V USB adapter to a
high-voltage USB PD source and traditional adapters.
During power up, the charger sets the converter to buck, boost, or buck-boost configuration based on the input
source and battery conditions. During the charging cycle, the charger automatically transits among buck, boost,
and buck-boost configuration without host control.
The BQ2572x monitors adapter current, battery current, and system power. The flexibly programmed PROCHOT
output goes directly to the CPU for throttle back, when needed.
For more details on register functions, see the
BQ25720 SMBus 1- to 4-Cell Narrow VDC Buck-Boost Battery
Charge Controller With System Power Monitor and Processor Hot Monitor
BQ25723 I2C 1- to 4-Cell Narrow
VDC Buck-Boost Battery Charge Controller With System Power Monitor and Processor Hot Monitor
data sheets.
Introduction
2
BQ25720, BQ25723 Evaluation Module
SLUUC74 – MAY 2021
Copyright © 2021 Texas Instruments Incorporated