QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 486B
DUAL-SMART BATTERY CHARGER/SELECTOR BOARD
1
LTC1760
DESCRIPTION
DESCRIPTION DESCRIPTION
DESCRIPTION
Demonstration circuit 486B is a dual Smart Battery
PowerPath and charger controller featuring the
LTC1760. The input voltage is 12 to 20V. The charger
output voltage is programmed SMBus serial inter-
face. The maximum charge current is 4A. The de-
moboard has been optimized to work with 2, 3 and 4-
Cell Li-ion battery packs. A jumper is provided to se-
lect trip for low battery voltage (LOBAT), VLIMIT
(VLIM), and ILIMIT (ILIM). The board will automati-
cally charge any battery chemistry or cell configura-
tion within the limits provided. By default, the board
will power up in 3-Diode mode, which simply means
all three power paths to the output (load) are on. The
LTC1760 follows the Smart Battery Standards for the
Smart Battery System Manager (SBSM) specification.
The standard specifies that all PowerPath selection is
automatically controlled exclusively by the LTC1760.
There is no SMBUS interface command to control the
power paths. A user-selectable standalone mode is
provided where the host SMBus lines become battery
status output signals and can be monitored with the
on-board LEDs.
OPTIONAL DC1223A-B Demoboard: The DC486B
demoboard is populated with connectors that allow
the use of an optional DC1223A-B SMBUS-to-USB
port adapter and associated software to control the
LTC1760 and monitor the batteries for demonstration
purposes only. The software also supports data log-
ging. Contact your LT representative for ordering a
DC1223A-B.
Design files for
Design files for Design files for
Design files for this circuit board are avail
this circuit board are availthis circuit board are avail
this circuit board are availa
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able.
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Call the LTC factory.
Call the LTC factory.Call the LTC factory.
Call the LTC factory.
PowerPath is a trademark of Linear Technology Corporation
Table
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Table
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Performance Summary
Performance SummaryPerformance Summary
Performance Summary
PARAMETER
PARAMETERPARAMETER
PARAMETER
CONDITION
CONDITIONCONDITION
CONDITION
VALUE
VALUEVALUE
VALUE
Maximum Input Voltage Limited by input capacitor voltage rating 20V +/- 10 %
Recommended Minimum Input Voltage 12V +/- 10%
Low Battery Voltage
Trip point at full discharge
0% capacity voltage. Set by DCLOW TRIP Jumper. 5.3V for 2-cell Li-ion
7.9 for 3-cell Li-ion
11V for 4-cell Li-ion.
Input Trip Voltage Set by DCDIV divider network 10.7V +/- 3%
Maximum Charge Current VIN > VBATmax > 6V 4A +/- 5%
Adjustable to 1, 2 and 3A.
Short-Circuit Shutdown Trip Current Static Load T > 15mS 8.33A +/- 5%
Input Current Limit IBAT + ILOAD 3.57A +/- 5%
