LTC1960 Dual Battery Charger/ Selector with SPI Interface FEATURES DESCRIPTION n Complete Dual-Battery Charger/Selector System The LTC 1960 is a highly integrated battery charger and n Serial SPI Interface Allows External C Control and selector intended for portable products using dual smart Monitoring batteries. A serial SPI interface allows an external micro- n Simultaneous Dual-Battery Discharge Extends Run controller to control and monitor status of both batteries. Time by Typically 10% A proprietary PowerPath architecture supports simulta- n Simultaneous Dual-Battery Charging Reduces neous charging or discharging of both batteries. Typical Charging Time by Up to 50% battery run times are extended by 10%, while charging n Automatic PowerPath Switching in <10s times are reduced by up to 50%. The LTC1960 automati- Prevents Power Interruption cally switches between power sources in less than 10s n Circuit Breaker Protects Against Overcurrent Faults to prevent power interruption upon battery or wall adapter n 5% Accurate Adapter Current Limit Maximizes removal. Charging Rate n The synchronous buck battery charger delivers 95% effi- 95% Efficient Synchronous Buck Charger n ciency with only 0.5V dropout voltage, and prevents audible Charger Has Low 0.5V Dropout Voltage n noise in all operating modes. Patented input current limit- No Audible Noise Generation, Even with Ceramic ing with 5% accuracy charges batteries in the shortest Capacitors n possible time without overloading the wall adapter. 11-Bit VDAC Delivers 0.8% Voltage Accuracy n 10-Bit IDAC Delivers 5% Current Accuracy The LTC1960s 5mm 7mm 38-pin QFN and 36-pin nar- n V Up to 32V V Up to 28V IN BATT row SSOP packages allow implementation of a complete n Available in 5mm 7mm 38-Pin QFN and 36-Pin SBS-compliant dual battery system while consuming Narrow SSOP Packages minimum PCB area. All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 5481178, 5723970, 6304066, 6580258. APPLICATIONS n Portable Computers n Portable Instruments Dual vs Sequential Charging TYPICAL APPLICATION 3500 LTC1960 Dual Battery/Selector System Architecture BAT2 BAT1 3000 CURRENT CURRENT 2500 2000 SEQUENTIAL DC 1500 IN 1000 500 0 3500 SYSTEM POWER BAT1 3000 CURRENT 2500 BAT2 DUAL 2000 CURRENT 1500 LTC1960 MICROCONTROLLER SMBus 1000 100 4 500 MINUTES 0 SPI 0 50 100 150 200 250 300 BAT2 BAT1 TIME (MINUTES) 1960 TA01 BATTERY TYPE: 10.8V Li-Ion (MOLTECH NI2020) REQUESTED CURRENT = 3A REQUESTED VOLTAGE = 12.3V MAX CHARGER CURRENT = 4.1A 1960 TA01b Rev. C 1 Document Feedback For more information www.analog.com BATTERY CURRENT (mA)LTC1960 ABSOLUTE MAXIMUM RATINGS (Note 1) Voltage from DCIN, SCP, SCN, CLP, V , COMP1 to GND ............................................ 0.3V to 5V PLUS SW to GND ................................................. 0.3V to 32V Operating Ambient Temperature Voltage from SCH1, SCH2 to GND ............. 0.3V to 28V Range (Note 7) ............................................ 0C to 70C Voltage from BOOST to GND ......................0.3V to 41V Operating Junction Temperature ............ 40C to 125C PGND with Respect to GND ...................................0.3V Storage Temperature.............................. 65C to 150C CSP, CSN, BAT1, BAT2 to GND ...................... 5V to 28V Lead Temperature (Soldering, 10 sec) LOPWR, DCDIV to GND ............................. 0.3V to 10V SSOP Only ........................................................300C SSB, SCK, MOSI, MISO to GND ................... 0.3V to 7V PIN CONFIGURATION TOP VIEW TOP VIEW 1 36 SCH2 V PLUS 2 25 GCH2 BAT2 3 34 GCH1 BAT1 38 37 36 35 34 33 32 4 33 SCH1 SCN V 1 31 SCP SET 5 32 TGATE I 2 30 SCN SCP TH 6 31 BOOST I 3 29 BAT1 GDCO SET GND 4 28 BAT2 7 30 SW GDCI DCDIV 5 27 V 8 29 DCIN PLUS GB1O SSB 6 26 GND 9 28 V 39 GB1I CC GND SCK 7 25 SCH2 10 27 BGATE GB2O MISO 8 24 GCH2 11 26 PGND GB2I MOSI 9 23 GCH1 12 25 COMP1 LOPWR GND 10 22 SCH1 13 24 CLP V SET CSN 11 21 TGATE 14 23 CSP I TH CSP 12 20 BOOST 15 22 CSN I SET 13 14 15 16 17 18 19 16 21 MOSI GND 17 20 MISO DCDIV 18 19 SCK SSB UHF PACKAGE 38-LEAD (5mm 7mm) PLASTIC QFN G PACKAGE T = 125C, = 34C/W JMAX JA 36-LEAD PLASTIC SSOP THE EXPOSED PAD (PIN 39) IS GND. MUST BE SOLDERED TO THE PCB T = 125C, = 70C/W JMAX JA ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC1960CG PBF LTC1960CG TRPBF LTC1960CG 36-Lead Plastic SSOP 0C to 70C LTC1960CUHF PBF LTC1960CUHF TRPBF 1960 38-Lead (5mm 7mm) Plastic QFN 0C to 70C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. Rev. C 2 For more information www.analog.com CLP LOPWR COMP1 GB2I PGND GB2O BGATE GB1I V GB1O CC DCIN GDCI SW GDCO