QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC512B 4A SMART BATTERY CHARGER LTC4100 DESCRIPTION Demonstration circuit DC512B is a single battery switch- power to the system load from the wall adapter or bat- ing step-down charge controller featuring the LTC4100. tery. Status LEDs are provided for CHG, ACP, The recommended input power is 15 to 20V at 3.5A. A SMBALERT and SMBus activity. two-position jumper allows choice of protected output The optional DC1223A-B SMBUS to USB adapter and voltage range suitable for 3- and 4-Cell Li-ion batteries. associated software to control, monitor, and data log the Removal of the jumper allows full output voltage range. system for demonstration purposes only. This software The maximum charge current is 4A. is not required to charge a battery with the DC512B. The demo board is initially configured for 12.6V at 3A Contact your LT representative for ordering a for popular 3-cell Li-ion battery packs. LTC4100 will au- DC1223A-B. tomatically charge a Smart Battery to termination as Design files for this circuit board are available at soon as input power is applied with a battery connected QUICK START GUIDE FOR DEMONSTRATION CIRCUIT DC512B 4A SMART BATTERY CHARGER QUICK START PROCEDURE Demonstration circuit 512B is easy to set up to Optional evaluate the performance of the LTC4100. Refer to 1. For different ILIM & VLIM settings, adjust JP1 Figure 1 for proper measurement equipment setup & JP3 as necessary. and follow the procedure below. 2. To disable charging through hardware, connect 1. Set the jumpers according to the voltage and cur- CHGEN to GND. rent specifications of the pack under evaluation. 3. To probe the SMBus communication or connect to 2. With all power off, connect input power supply, an external host, connect leads to SDA, SCL, and and meters as shown in Figure 1. GND. 3. Preset the system load to 0A and the input sup- 4. To use an external logic supply, disable the on- ply to 0V, 0A current limit. board 5V linear regulator by setting JP2 to OFF. 4. Turn on the supply, setting the current limit to Note: Not supplying an alternative VLOGIC will 3.5A. disable the LEDs as well as SMBus communica- tions, which prevents charging. It is always rec- 5. Adjust the input voltage to the desired value, up ommended to supply a VLOGIC at all times. to 25V. 5. Use DC1223A-B USB-to-SMBus demoboard to 6. Connect the battery to begin charging. Plug in control and configure the provided DC512B evalu- the battery. An industry standard 5-pin Smart Bat- ation software. tery connector is provided as well as generic sol- dering test points for hardwire connections. Please refer to the LTC4100 datasheet for additional information. 2