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LTC1960_11

Description
Dual Battery Charger/ Selector with SPI Interface
File Size302KB,28 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet View All

LTC1960_11 Overview

Dual Battery Charger/ Selector with SPI Interface

FEATURES
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LTC1960
Dual Battery Charger/
Selector with SPI Interface
DESCRIPTION
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 microcon-
troller 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% effi-
ciency with only 0.5V dropout voltage, and prevents audible
noise in all operating modes. Patented input current limit-
ing 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 nar-
row SSOP packages allow implementation of a complete
SBS-compliant dual battery system while consuming
minimum PCB area.
L,
LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
No R
SENSE
and PowerPath are trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
5481178, 5723970, 6304066, 6580258.
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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™ 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
V
IN
Up to 32V; V
BATT
Up to 28V
Available in 5mm × 7mm 38-Pin QFN and 36-Pin
Narrow SSOP Packages
APPLICATIONS
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Portable Computers
Portable Instruments
TYPICAL APPLICATION
LTC1960 Dual Battery/Selector System Architecture
BATTERY CURRENT (mA)
DC
IN
3500
3000
2500
2000
1500
1000
500
0
3500
3000
2500
2000
1500
1000
500
0
Dual vs Sequential Charging
BAT1
CURRENT
BAT2
CURRENT
SEQUENTIAL
SYSTEM POWER
BAT1
CURRENT
BAT2
CURRENT
DUAL
100
MINUTES
LTC1960
4
BAT2
BAT1
SPI
MICROCONTROLLER
SMBus
0
50
100
150
200
TIME (MINUTES)
250
300
1960 TA01
BATTERY TYPE: 10.8V Li-Ion (MOLTECH NI2020)
REQUESTED CURRENT = 3A
REQUESTED VOLTAGE = 12.3V
MAX CHARGER CURRENT = 4.1A
1960 TA01b
1960fb
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