DC486B Analog Devices

QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 486B DUAL-SMART BATTERY CHARGER/SELECTOR BOARD LTC1760 DDDDEEEESSSSCCCCRRRRIIIIPPPPTTTTIIIIOOOONNNN Demonstration circuit 486B is a dual Smart Battery power paths. A user-selectable standalone mode is PowerPath and charger controller featuring the provided where the host SMBus lines become battery LTC1760. The input voltage is 12 to 20V. The charger status output signals and can be monitored with the output voltage is programmed SMBus serial inter- on-board LEDs. face. The maximum charge current is 4A. The de- OPTIONAL DC1223A-B Demoboard: The DC486B moboard has been optimized to work with 2, 3 and 4- demoboard is populated with connectors that allow Cell Li-ion battery packs. A jumper is provided to se- the use of an optional DC1223A-B SMBUS-to-USB lect trip for low battery voltage (LOBAT), VLIMIT port adapter and associated software to control the (VLIM), and ILIMIT (ILIM). The board will automati- LTC1760 and monitor the batteries for demonstration cally charge any battery chemistry or cell configura- purposes only. The software also supports data log- tion within the limits provided. By default, the board ging. Contact your LT representative for ordering a will power up in 3-Diode mode, which simply means DC1223A-B. all three power paths to the output (load) are on. The DDDDeeeessssiiiiggggnnnn ffffiiiilllleeeessss ffffoooorrrr tttthhhhiiiissss cccciiiirrrrccccuuuuiiiitttt bbbbooooaaaarrrrdddd aaaarrrreeee aaaavvvvaaaaiiiillllaaaabbbblllleeee.... LTC1760 follows the Smart Battery Standards for the CCCCaaaallllllll tttthhhheeee LLLLTTTTCCCC ffffaaaaccccttttoooorrrryyyy.... Smart Battery System Manager (SBSM) specification. The standard specifies that all PowerPath selection is PowerPath is a trademark of Linear Technology Corporation automatically controlled exclusively by the LTC1760. There is no SMBUS interface command to control the TTTTaaaabbbblllleeee 1111.... PPPPeeeerrrrffffoooorrrrmmmmaaaannnncccceeee SSSSuuuummmmmmmmaaaarrrryyyy PPPPAAAARRRRAAAAMMMMEEEETTTTEEEERRRR CCCCOOOONNNNDDDDIIIITTTTIIIIOOOONNNN VVVVAAAALLLLUUUUEEEE Maximum Input Voltage Limited by input capacitor voltage rating 20V +/- 10 % Recommended Minimum Input Voltage 12V +/- 10% Low Battery Voltage 0% capacity voltage. Set by DCLOW TRIP Jumper. 5.3V for 2-cell Li-ion Trip point at full discharge 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% 1 QUICK START GUIDE FOR DEMONSTRATION CIRCUIT 486B DUAL-SMART BATTERY CHARGER/SELECTOR BOARD QQUUIICCKK SSTTAARRTT PPRROOCCEEDDUURREE QQUUIICCKK SSTTAARRTT PPRROOCCEEDDUURREE 1111.... Connect the input power source to J1 or DCIN and 4444.... Plug in one or two Smart Batteries of your choice GND terminals using a power supply capable of to BATTERY 1 and/or BATTERY2. Industry standard handling 4A of current within the 11 to 20V range. 5-Pin AMP Smart Battery connectors are provided The input supply MUST be greater than the full bat- as well as test points. tery voltage to allow a full charge to take place. 5555.... Optionally use the provided DC1223A-B demon- 2222.... Connect the load to DCOUT and GND terminals. stration software to control and configure the DC486B. 3333.... Turn on the input power supply. FFiigguurree 11.. PPrrooppeerr MMeeaassuurreemmeenntt EEqquuiippmmeenntt SSeettuupp FFiigguurree 11.. PPrrooppeerr MMeeaassuurreemmeenntt EEqquuiippmmeenntt SSeettuupp 2