Datasheet LTC4000 (Analog Devices)

LTC4000 High Voltage High Current Controller for Battery Charging and Power Management
FeaTures DescripTion
n
Complete High Performance Battery Charger When
The LTC®4000 is a high voltage, high performance controller
Paired with a DC/DC Converter
that converts many externally compensated DC/DC power n
Wide Input and Output Voltage Range: 3V to 60V
supplies into full-featured battery chargers. n
Input Ideal Diode for Low Loss Reverse Blocking
Features of the LTC4000’s battery charger include: accurate
and Load Sharing
(±0.25%) programmable float voltage, selectable timer or n
Output Ideal Diode for Low Loss PowerPath™ and
current termination, temperature qualified charging using
Load Sharing with the Battery
an NTC thermistor, automatic recharge, C/10 trickle charge n
Instant-On Operation with Heavily Discharged
for deeply discharged cells, bad battery detection and
Battery
status indicator outputs. The battery charger also includes n
Programmable Input and Charge Current:
precision current sensing that allows lower sense voltages
±1% Accuracy
for high current applications. n
±0.25% Accurate Programmable Float Voltage
n Programmable C/X or Timer Based Charge The LTC4000 supports intelligent PowerPath control. An Termination external PFET provides low loss reverse current protec- n NTC Input for Temperature Qualified Charging tion. Another external PFET provides low loss charging n 28-Lead 4mm × 5mm QFN or SSOP Packages or discharging of the battery. This second PFET also facilitates an instant-on feature that provides immediate downstream system power even when connected to a
applicaTions
heavily discharged or short faulted battery. n High Power Battery Charger Systems n The LTC4000 is available in a low profile 28-lead 4mm × High Performance Portable Instruments n 5mm QFN and SSOP packages. Industrial Battery Equipped Devices L n , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Notebook/Subnotebook Computers PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical applicaTion 48V to 10.8V at 10A Buck Converter Charger for Three LiFePO4 Cells Charge Current and VOUT Profile vs V
Si7135DP
BAT During a Charge Cycle
LT3845A VOUT 15V TO 60V IN OUT 12V, 15A 5mΩ SHDN VC 12 11 100µF 1.15M 5mΩ ICHARGE V 14.7k 47nF 10 OUT 10.5 ITH CC IID IGATE CSP RST CSN 8 V 10 OUT CLN BGATE Si7135DP V (A) OUT IN BAT 6 9.5 (V) 1µF 1.10M OFB I CHARGE VM 127k 4 9 LTC4000 100k 3.0V ENC FBG V 2 8.5 CHRG 133k BAT ICHARGE 10.8V FLOAT FLT BFB 10A MAX CHARGE 1.13M 0 8 IIMON CURRENT NTC 6 7 8 9 10 11 12 10nF IBMON VBAT (V) 10nF TMR CL CX GND BIAS 10k 4000 TA01b 10k 3-CELL LiFePO4 BATTERY PACK 24.9k 22.1k 0.1µF 1µF 4000 TA01a NTHS0603 N02N1002J 4000fb For more information www.linear.com/LTC4000 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts