DV2954S1L_14 Datasheet, PDF (1/5 Pages) List of Unclassifed Manufacturers – Li-Ion Charger Development System

DV2954S1L
Li-Ion Charger Development System
Control of On-Board PNP Switch-Mode Regulator
with Low-Side Current Sensing
Features
➤ bq2954 fast-charge control evaluation and
development, based on switching buck converter with
low-side battery-current sensing
➤ On-board configuration for fast charge of 1, 2, 3, or 4
Li-Ion cells
➤ Charge termination by maximum voltage, selectable
minimum current, or maximum time-out
➤ Constant current (up to 1.25A) and constant voltage
(up to 16.8V) provided by on-board switch-mode
regulator
➤ Jumper-configurable bicolor-LED display
➤ Direct connections for battery and thermistor
➤ Maximum charge time of 5 hours
General Description
The DV2954S1L Development System provides a devel-
opment environment for the bq2954 Lithium Ion Fast-
Charge IC. The DV2954S1L incorporates a bq2954 and a
buck-type switch-mode regulator to provide fast charge
control for 1 through 4 Li-Ion cells.
Fast charge is preceded by a pre-charge qualification pe-
riod.
Fast charge termination occurs on:
I Minimum current – IMAX divided by 10, 15, or 20
I Maximum time-out
The bq2954 can be reset and a new charge cycle started
by applicaton of power to the board or battery replace-
ment. The board automatically initiates a recharge
when the battery voltage drops to 3.85V per cell.
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 DV2954S1L board, please review the
bq2954 data sheet.
Connection Descriptions
J1
DC+
DC-
J2
BAT+
TEM+
BAT-
JP1
JP2
JP3
Charger supply positive (24VDC max.)
Charger supply ground
Positive battery terminal
Postive thermistor connections
Negative battery terminal and
thermistor connecton.
Display mode selection
Number of cells selection
Full and minimum current termination
select
10/98
Rev. C Board
1