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Features
ä bq2031 fast-charge control evaluation and
development
ä Onboard configuration for fast charge of 2, 3, 4 or 6
lead-acid cells; user-defined option allows other
configurations
ä Selectable charge algorithms: Two-Step Voltage,
Two-Step Current, or Pulsed Current
ä Constant current (up to
2.5A) and constant voltage
(up to 15V) provided by on-board switch-mode
regulator
ä Charge termination by maximum voltage, second
difference of cell voltage, minimum current, or
maximum time-out
ä Direct connections for battery, thermistor, and power
supply
ä MTO is set for 3.1 hours
ä Jumper-configurable 3-LED display
General Description
The DV2031S2 Development System provides a develop-
ment environment for the bq2031 Lead-Acid Fast-
Charge IC. The DV2031S2 incorporates a bq2031 in a
buck-type switch-mode regulation mode to provide
fast-charge control for 2, 3, 4, or 6 lead-acid cells.
The DV2031S2 can be configured for three different
charge algorithms with jumpers JP1 and JP3. The
charge algorithms available are
Two-step voltage
Two-step current
Pulsed current
Each algorithm consists of pre-charge qualification, fast
charge, and maintenance charge periods.
Fast charge termination occurs on
Maximum voltage
The second difference of cell voltage (
∆
2
V)
Minimum current
Maximum time-out
The maintenance charge may be configured for either a
regulated float voltage or a pulsed current.
The user provides a DC power supply and batteries
and configures the board for the number of cells, the
minimum current threshold, and the LED display
mode. The board has direct connections for the battery
and the provided thermistor.
Before using the DV2031S2 board, please review the
bq2031 data sheet (SLUS156) and the application note
entitled “Using the bq2031 to Charge Lead-Acid Bat-
teries” (SLUA017).
1
DV2031S2
SLUU023B DECEMBER 1998 REVISED MARCH 2007 Rev. B Board
Lead-Acid Charger Development System
Control of On-Board
P-FET Switch-Mode Regulator
Please be aware that three important notices concerning operating limitations, standard warranty, and
liability limitations appear at the end of this data sheet.
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