LTC1960 Datasheet, PDF (1/24 Pages) Linear Technology – Dual Battery Charger/Selector with SPI Interface

FEATURES
■ _{Complete Dual-Battery Charger/Selector System}
■ _{Serial SPI Interface Allows External µC Control and}
Monitoring
■ _{Simultaneous Dual-Battery Discharge Extends Run}
Time by Typically 10%
■ _{Simultaneous Dual-Battery Charging Reduces}
Charging Time by Up to 50%
■ _{Automatic PowerPath}^TM _{Switching in <10µs}
Prevents Power Interruption
■ _{Circuit Breaker Protects Against Overcurrent Faults}
■ _{5% Accurate Adapter Current Limit Maximizes}
Charging Rate*
■ _{95% Efficient Synchronous Buck Charger}
■ _{Charger Has Low 0.5V Dropout Voltage}
■ _{No Audible Noise Generation, Even with Ceramic}
Capacitors
■ _{11-Bit VDAC Delivers 0.8% Voltage Accuracy}
■ _{10-Bit IDAC Delivers 5% Current Accuracy}
■ _{VIN Up to 32V; VBATT Up to 28V}
■ _{Available in 5mm × 7mm 38-Pin QFN and 36-Pin}
Narrow SSOP Pa_Uckages
APPLICATIO S
■ _{Portable Computers}
■ _{Portable Instruments}
LTC1960
Dual Battery Charger/
Selector with SPI Interface
DESCRIPTIO
The LTC^®1960 is a highly-integrated battery charger and
selector intended for portable products using dual smart
batteries. A serial SPI interface allows an external
microcontroller to control and monitor status of both
batteries.
A proprietary PowerPath architecture supports simulta-
neous charging or discharging of both batteries. Typical
battery run times are extended by 10%, while charging
times are reduced by up to 50%. The LTC1960 automati-
cally switches between power sources in less than 10µs to
prevent power interruption upon battery or wall adapter
removal.
The synchronous buck battery charger delivers 95%
efficiency with only 0.5V dropout voltage, and prevents
audible noise in all operating modes. Patented* input
current limiting with 5% accuracy charges batteries in the
shortest possible time without overloading the wall adapter.
The LTC1960’s 5mm × 7mm 38-pin QFN and 36-pin
narrow SSOP packages allow implementation of a com-
plete SBS-compliant dual battery system while consum-
ing minimum PCB area.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
PowerPath is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.S. Patents, including 5481178, 5723970, 6304066, 6580258.
TYPICAL APPLICATIO
LTC1960 Dual Battery/Selector System Architecture
DC
IN
SYSTEM POWER
BAT2 BAT1
LTC1960
MICROCONTROLLER
4
SPI
SMBus
1960 TA01
Dual vs Sequential Charging
3500
3000
2500
BAT1
CURRENT
BAT2
CURRENT
2000
1500
SEQUENTIAL
1000
500
0
3500
3000
2500
2000
BAT1
CURRENT
BAT2
CURRENT
DUAL
1500
1000
500
0
0
100
MINUTES
50 100 150 200 250 300
TIME (MINUTES)
BATTERY TYPE: 10.8V Li-Ion (MOLTECH NI2020)
REQUESTED CURRENT = 3A
REQUESTED VOLTAGE = 12.3V
MAX CHARGER CURRENT = 4.1A
1960 G10
1960fa
1