QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 495
LTC4006
DESCRIPTION
Demonstration circuit 495 is a single battery stand-
alone battery charge controller with built in charge
termination featuring the LTC
®
4006. The input
voltage is 9 to 20V. The charger output voltage is
fixed for a 2cell 8.4V Li-ion battery. The maximum
charge current is 2A. The board will automatically
charge a battery to termination as soon as input
power is applied with a battery connected prior to
power up. Status LEDs are provided for CHG, ACP,
and C/10. An onboard NTC thermistor is provided.
Although this charger is not a smart battery charger,
a popular smart battery connector is provided that
Table 1.
Performance Summary
CONDITION
Limited by input Capacitor Volt Ratings.
Vin > Vbat Termination voltage.
VALUE
20V +/- 10 %
9V when using an 8.4V Li-ion bat-
tery.
2 Amps
Vin > Vbatmax > 6V
2A +/- 5%
2 CELL LI-ION BATTERY CHARGER WITH CHARGE TERMINATION
can be used for data logging with the OPTIONAL
DC1223A-B Demo board and software. To be clear,
you do NOT need a smart battery to use this board.
The optional DC1223A-B SMBUS to USB port adapter
and associated software to monitor a smart battery
for demonstration purposes only. Contact your LT
representative for ordering a DC1223A-B.
Design files for this circuit board are available. Call
the LTC factory.
LTC is a registered trademark of Linear Technology Corporation.
PARAMETER
Maximum Input Voltage
Recommended Minimum Input Voltage
Input Current Limit
Maximum Charge Current
QUICK START PROCEDURE
Demonstration circuit 495 is easy to set up to
evaluate the performance of the LTC4006. Refer to
Figure 1 for proper measurement equipment setup
and follow the procedure below:
NOTE:
When measuring the input or output voltage
on the oscilloscope probe. Measure the input or out-
put voltage ripple by touching the probe tip directly
across the V
IN
or V
OUT
and GND terminals. See Figure
2 for proper scope probe technique.
ripple, care must be taken to avoid a long ground lead
1. Connect the input power source to DCIN
terminals J1 or DCIN and GND using a power
supply capable of handling 2.5A of current within
a 9 to 20V range. The input supply MUST be
greater than the full voltage value of the battery to
allow a full charge to take place.
2. Connect the load to DCOUT and GND terminals.
3. Plug in s 8.4V Li-ion battery. Industry standard 5
Pin AMP Smart Battery connector is provided as
well as generic soldering Test Points for hardwire
connections.
4. Turn on the input power supply.
5. Optionally use the provided DC1223A-B
demonstration software to control and configure
the DC495.
1
QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 495
6.
NOTE:
If the board is allowed to get to warm, the
onboard NTC thermistor may trip and
momentarily suspend the charge process. This
can be confirmed by the fault LED turning on.
When the board cools down, charging will
resume.
2 CELL LI-ION BATTERY CHARGER WITH CHARGE TERMINATION
Figure 1: Proper Measurement Equipment Setup
Figure 2: Scope Probe Placement for Measuring Input or Output Ripple
2
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