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SLVUAN2A – May 2016 – Revised July 2016
Copyright © 2016, Texas Instruments Incorporated
bq77905 3-5S Low Power Protector Evaluation Module
User's Guide
SLVUAN2A – May 2016 – Revised July 2016
bq77905 3-5S Low Power Protector Evaluation Module
This evaluation module (EVM) is a complete evaluation system for the bq77905 3-5S low power protector
for lithium-ion cells. The EVM includes one bq77905 and FETs to control current in a configuration typical
for switching current in a lithium-ion battery pack. The circuit module includes one bq77905 integrated
circuit (IC), a sense resistor, thermistor, two CSD18534Q5A FETs, and all other onboard components
necessary to switch charge and discharge current. The circuit module connects between a "battery"
source and a "pack" load. In addition to the current and voltage applied to the module the user can
remove on-board jumpers to simulate over- or under-temperature conditions to observe FET control under
different charge and discharge conditions.
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Features
•
Complete evaluation system for the bq77905 3-5S Low Power Protector IC
•
Populated circuit module for quick setup
1.1
Kit Contents
•
bq77905 circuit module
1.2
Ordering Information
The EVM orderable part number is bq77905EVM-707. For complete ordering information, see the product
page at
.
1.3
Documentation
See the device data sheet for bq77905 (
) on
for information on device hardware.
1.4
bq77905 Circuit Module Performance Specification Summary
This section summarizes the performance specifications of the bq77905EVM.
Table 1. Performance Specification Summary
Specification
Minimum
Typical
Maximum
Unit
Input voltage BATT+ to BATT–
3
18
25
V
Output voltage PACK+ to PACK-
0
18
25
V
Charge and discharge current
0
2
3
A
Operating temperature
20
25
30
o
C
While the board is rated at 3A, this is the nominal over current limit of the installed bq77905 configuration.
Other components may have a higher rating.
