Linear Technology LTC4007 User manual

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 498
3 AND 4 CELL LI-ION BATTERY CHARGER BOARD WITH BUILT IN CHARGE TERMINATION
1
LTC4007
DESCRIPTION
Demonstration circuit 498 is a single battery stand-
alone battery charge controller with built in charge
termination featuring the LTC®4007. The input voltage
is 13 to 20V. The charger output voltage is pro-
grammed by jumpers to support 3- and 4-Cell Li-ion
batteries with a cell voltage of 4.1V or 4.2V/Cell. The
maximum charge current is 4A. The demo board is
initially configured for 12.6V Li-ion batteries. The
board will automatically charge a battery to termina-
tion as soon as input power is applied with a battery
connected prior to power up. Status LEDs are pro-
vided for CHG, ACP, FAULT, FLAG, ICL and LOBAT.
An onboard NTC thermistor is provided. Although this
charger is not a smart battery charger, a popular
smart battery connector is provided that 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 asso-
ciated software to monitor a smart battery are for
demonstration purposes only. Contact your LT repre-
sentative 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.
Table 1. Performance Summary
PARAMETER CONDITION VALUE
Maximum Input Voltage Limited by input Capacitor Volt Ratings. 20V +/- 10 %
Recommended Minimum Input Voltage Vin > Vbat Termination voltage. 13V when using a 12.6V Li-ion battery.
Input Current Limit 3.5A
Maximum Charge Current Vin > Vbatmax > 6V 4A +/- 5%
QUICK START PROCEDURE
Demonstration circuit 498 is easy to set up to eva-
luate the performance of the LTC4007. Refer to Figure
1 for proper measurement equipment setup and fol-
low the procedure below:
NOTE: When measuring the input or output voltage
ripple, care must be taken to avoid a long ground lead
on the oscilloscope probe. Measure the input or out-
put voltage ripple by touching the probe tip directly
across the VIN or VOUT and GND terminals. See Figure
2 for proper scope probe technique.
1. Connect the input power source to DCIN termin-
als J1 or DCIN and GND using a power supply ca-
pable of handling 4A of current within an 11 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 VOUT and GND terminals.
3. Configure the jumpers for your specific battery.
4. Plug in the battery. The industry standard 5 Pin
AMP Smart Battery connector is provided as well
as generic soldering Test Points for hardwire con-
nections.
5. Turn on the input power supply.
6. Optionally use the provided DC1223A-B demon-
stration software to control and configure the
DC498A.
Downloaded from Arrow.com.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 498
3 AND 4 CELL LI-ION BATTERY CHARGER BOARD WITH BUILT IN CHARGE TERMINATION
2
7. NOTE: If the board is allowed to get warm, the
onboard NTC thermistor may trip and momentarily
suspend the charge process. This can be con-
firmed by the fault LED turning on. When the board
cools down, charging will resume.
Figure 1: Proper Measurement Equipment Setup
Figure 2: Scope Probe Placement for Measuring Input or Output Ripple
OPTIONAL DC1223A-B SMBUS
TO USB ADAPTER
PROVIDES DATA LOGGING AND
BATTERY CONTROL
Downloaded from Arrow.com.Downloaded from Arrow.com.

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 498
3 AND 4 CELL LI-ION BATTERY CHARGER BOARD WITH BUILT IN CHARGE TERMINATION
3
Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.