Datasheet LTC1960 (Analog Devices)

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 µC 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 <10µs
times are reduced by up to 50%. The LTC1960 automati-
Prevents Power Interruption
cally switches between power sources in less than 10µs 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 95% Efficient Synchronous Buck Charger The synchronous buck battery charger delivers 95% effi- n Charger Has Low 0.5V Dropout Voltage ciency with only 0.5V dropout voltage, and prevents audible n No Audible Noise Generation, Even with Ceramic noise in all operating modes. Patented input current limit- Capacitors ing with 5% accuracy charges batteries in the shortest n 11-Bit VDAC Delivers 0.8% Voltage Accuracy possible time without overloading the wall adapter. n 10-Bit IDAC Delivers 5% Current Accuracy The LTC1960’s 5mm × 7mm 38-pin QFN and 36-pin nar- n VIN Up to 32V; VBATT Up to 28V 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.
APPLICATIONS
All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 5481178, 5723970, 6304066, 6580258. n Portable Computers n Portable Instruments
TYPICAL APPLICATION Dual vs Sequential Charging LTC1960 Dual Battery/Selector System Architecture
3500 3000 BAT1 BAT2 2500 CURRENT CURRENT 2000
SEQUENTIAL
DC 1500 IN 1000 500 0 SYSTEM POWER 3500 3000 BAT1 2500 CURRENT BAT2 BATTERY CURRENT (mA) 2000 CURRENT
DUAL
1500 LTC1960 MICROCONTROLLER SMBus 1000 4 500 100 MINUTES SPI 0 BAT2 BAT1 0 50 100 150 200 250 300 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 Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Test Circuit Timing Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts