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Introduction
1
Introduction
1.1
EVM Features
This EVM supports the following features:
•
Evaluation module for the bq2570x devices
•
Supports 3.5- to 24-V input source
– 3.5- to 24-V, 0- to 6-A input operating range and 1–4 cell battery configuration
– Supports USB2.0, USB 3.0, USB 3.1 (USB Type-C™) and USB_PD
– Supports USB OTG with 4.48- to 20.8-V adjustable output
– Maximum Power Tracking by Input Voltage and Current Regulation
•
Narrow VDC (NVDC) power path management
– Instant-on works with no battery or deeply discharged battery (PG1.0 needs charge-enable
command)
– Battery supplements system when adapter is fully-loaded
•
800-kHz or 1.2-MHz switching frequency for low profile inductor
•
SMBus (bq25700A) or I
•
Power and Current Monitor for CPU Throttling
•
Safety
– Thermal shutdown
– Input and system overvoltage protection
– MOSFET overcurrent protection
•
Accelerate charge time by battery path impedance compensation
•
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 bq2570x evaluation modules are complete charger modules for evaluating an SMBUS or I
controlled buck boost charge using the bq2570x devices.
The bq2570x EVM does not include the EV2400 interface board. To evaluate the bq2570x EVM, order an
EV2400 interface board separately.
The bq2570x 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 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 bq2570x 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 bq2570x 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 data sheets – bq25700A (SLUSCQ8) and bq25703A
(SLUSCU1).
2
bq2570x Evaluation Module
2
C (bq25703A) port for optimal system performance and status reporting
Copyright © 2017, Texas Instruments Incorporated
www.ti.com
2
C-
SLUUBG6 – May 2017
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