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Analog Devices Semiconductor Electronic Components Datasheet

LTC3110EFE Datasheet

2A Bidirectional Buck-Boost DC/DC Regulator

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FEATURES
n VCAP Operating Range: 0.1V to 5.5V
n VSYS Operating Range: 1.71V to 5.25V
n Automatic Switchover from Charge to Backup Mode
n Programmable ±2% Accurate Charge Input Current
Limit from 125mA to 2A
n ±1% Backup Voltage Accuracy
n Automatic Backup Capacitor Balancing
n Fixed 1.2MHz Switching Frequency
n Burst Mode® Operation: 40μA Quiescent Current
n Built-In Programmable Multipurpose Comparator
with Open-Collector Output
n Open-Collector Outputs to Indicate Direction of
Operation and End of Charge
n Thermally Enhanced TSSOP-24 and 4mm × 4mm
QFN-24 Packages
APPLICATIONS
n Supercapacitor Backup Converter and Charger
n Battery Backup Converter and Charger
n Servers, RAID Systems
n RF Systems with Battery/Capacitor Backup
LTC3110
2A Bidirectional Buck-Boost
DC/DC Regulator and
Charger/Balancer
DESCRIPTION
The LTC®3110 is a 2A bidirectional buck-boost DC/DC
regulator with capacitor charger and balancer. Its wide
0.1V to 5.5V capacitor/battery voltage and 1.8V to 5.25V
system backup voltage ranges make it well suited to a
wide variety of backup applications using supercapacitors
or batteries. A proprietary low noise switching algorithm
optimizes efficiency with capacitor/battery voltages that
are above, below or equal to the system output voltage.
The LTC3110 can autonomously transition from charge
to backup mode or switch modes based on an external
command. Pin-selectable Burst Mode operation reduces
standby current and improves light-load efficiency,
which combined with a 1μA shutdown current make the
LTC3110 ideally suited for backup applications. Additional
features include voltage supervisors for direction control
and end of charge, and a general purpose comparator
with open-collector output for interfacing with a µC. The
LTC3110 is available in thermally enhanced, low profile
24-lead TSSOP and 4mm × 4mm QFN packages.
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
ICHARGE
FB
12V
MAIN
BUS
STEP-DOWN DC/DC
0.1V UP TO 5.5V
10F
1960k
10F
13.7k
523k
2.2µH
51.1Ω
220nF
1µF VCAP SW1
FBVCAP
CMPIN
0.1µF
SW2 SVSYS
VSYS
RSEN
PROG
47µF
1.50k
VMID
LTC3110
976k
FB
221k
MODE
RUN
SGND PGND
DIR
CHRG
CAPOK
CMPOUT
IBACKUP
VSYS
3.25V
2A
SYSTEM
2.5V
DC/DC
1.8V
REGULATORS
1.2V
1000k 1000k
µC
12V BUS
END OF CHRG SUPERVISOR
CAPLOW
3110 TA01a
Document Feedback
For more information www.analog.com
Backup Mode Efficiency
100
1.2
VSYS = 3.25V
ISYS = 0.5A
95
1.0
90
0.8
85
0.6
80
0.4
75
0.2
70
0
1.2 1.8 2.4 3.0 3.6 4.2 4.8 5.4
VCAP (V)
3110 TA01b
Rev C
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC3110EFE Datasheet

2A Bidirectional Buck-Boost DC/DC Regulator

No Preview Available !

LTC3110
ABSOLUTE MAXIMUM RATINGS (Note 1)
VCAP, VSYS, SVSYS, VMODE, VCMPIN,
VDIR, VRUN, VCAPOK, VCMPOUT, VCHRG....... –0.3V to 6V
RSEN DC Current ...................................................... 1.6A
Operating Junction Temperature Range
(Notes 2, 3)............................................. –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Soldering Temperature (Soldering, 10 sec)
TSSOP............................................................... 300°C
Reflow Peak Body Temperature (30sec max)
QFN.................................................................... 260°C
PIN CONFIGURATION
TOP VIEW
CAPOK 1
CMPOUT 2
MODE 3
CMPIN 4
FBVCAP 5
SGND 6
DIR 7
RUN 8
FB 9
PROG 10
CHRG 11
SVSYS 12
25
PGND
24 VMID
23 VCAP
22 VCAP
21 SW1
20 SW1
19 PGND
18 PGND
17 SW2
16 SW2
15 VSYS
14 RSEN
13 VSYS
FE PACKAGE
24-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 33°C/W, θJC = 5°C/W, 4 LAYER BOARD
EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB
TOP VIEW
CMPIN 1
FBVCAP 2
SGND 3
DIR 4
RUN 5
FB 6
24 23 22 21 20 19
25
PGND
18 SW1
17 SW1
16 PGND
15 PGND
14 SW2
13 SW2
7 8 9 10 11 12
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
TJMAX = 150°C, θJA = 37°C/W, θJC = 4.5°C/W, 4 LAYER BOARD
EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3110EFE#PBF
LTC3110EFE#TRPBF
LTC3110FE
24-Lead Plastic TSSOP
–40°C to 125°C
LTC3110IFE#PBF
LTC3110IFE#TRPBF
LTC3110FE
24-Lead Plastic TSSOP
–40°C to 125°C
LTC3110HFE#PBF
LTC3110HFE#TRPBF
LTC3110FE
24-Lead Plastic TSSOP
–40°C to 150°C
LTC3110EUF#PBF
LTC3110EUF#TRPBF
3110
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3110IUF#PBF
LTC3110IUF#TRPBF
3110
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 125°C
LTC3110HUF#PBF
LTC3110HUF#TRPBF 3110
24-Lead (4mm × 4mm) Plastic QFN
–40°C to 150°C
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


Part Number LTC3110EFE
Description 2A Bidirectional Buck-Boost DC/DC Regulator
Maker Analog Devices
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