POWER LOSS (W)
LTC3110
2A Bidirectional Buck-Boost
DC/DC Regulator and
Charger/Balancer
FEATURES DESCRIPTION
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V Operating Range: 0.1V to 5.5V The LTC 3110 is a 2A bidirectional buck-boost DC/DC
CAP
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V Operating Range: 1.71V to 5.25V regulator with capacitor charger and balancer. Its wide
SYS
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Automatic Switchover from Charge to Backup Mode 0.1V to 5.5V capacitor/battery voltage and 1.8V to 5.25V
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Programmable 2% Accurate Charge Input Current system backup voltage ranges make it well suited to a
Limit from 125mA to 2A wide variety of backup applications using supercapacitors
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1% Backup Voltage Accuracy or batteries. A proprietary low noise switching algorithm
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Automatic Backup Capacitor Balancing optimizes efficiency with capacitor/battery voltages that
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Fixed 1.2MHz Switching Frequency are above, below or equal to the system output voltage.
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Burst Mode Operation: 40A Quiescent Current
The LTC3110 can autonomously transition from charge
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Built-In Programmable Multipurpose Comparator
to backup mode or switch modes based on an external
with Open-Collector Output
command. Pin-selectable Burst Mode operation reduces
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Open-Collector Outputs to Indicate Direction of
standby current and improves light-load efficiency,
Operation and End of Charge
which combined with a 1A shutdown current make the
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Thermally Enhanced TSSOP-24 and 4mm4mm
LTC3110 ideally suited for backup applications. Additional
QFN-24 Packages
features include voltage supervisors for direction control
and end of charge, and a general purpose comparator
APPLICATIONS
with open-collector output for interfacing with a C. The
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Supercapacitor Backup Converter and Charger
LTC3110 is available in thermally enhanced, low profile
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Battery Backup Converter and Charger
24-lead TSSOP and 4mm 4mm QFN packages.
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Servers, RAID Systems
All registered trademarks and trademarks are the property of their respective owners.
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RF Systems with Battery/Capacitor Backup
TYPICAL APPLICATION
I
CHARGE
FB
12V MAIN
STEP-DOWN DC/DC
BUS
I
BACKUP
Backup Mode Efficiency
220nF 100 1.2
0.1V UP TO 5.5V V = 3.25V
2.2H SYS
51.1 V
SYS
I = 0.5A
SYS
3.25V
95 1.0
10F 47F 2A
1F
1960k V SW1 SW2 SV V
CAP SYS SYS
10F
FBV R 90 0.8
CAP SEN
13.7k PROG
85 0.6
1.50k
CMPIN
0.1F
523k
2.5V
SYSTEM
80 0.4
1.8V
DC/DC
V
MID LTC3110 976k REGULATORS
1.2V
75 0.2
FB
221k
70 0
1000k 1000k 1.2 1.8 2.4 3.0 3.6 4.2 4.8 5.4
MODE DIR V (V)
CAP
C
CHRG 12V BUS
3110 TA01b
SUPERVISOR
CAPOK END OF CHRG
RUN CMPOUT CAPLOW
SGND PGND
3110 TA01a
Rev C
1
Document Feedback For more information www.analog.com
EFFICIENCY (%)LTC3110
ABSOLUTE MAXIMUM RATINGS (Note 1)
V , V , SV , V , V , Storage Temperature Range .................. 65C to 150C
CAP SYS SYS MODE CMPIN
V , V , V , V , V ...... 0.3V to 6V Lead Soldering Temperature (Soldering, 10 sec)
DIR RUN CAPOK CMPOUT CHRG
R DC Current .....................................................1.6A TSSOP ..............................................................300C
SEN
Operating Junction Temperature Range Reflow Peak Body Temperature (30sec max)
(Notes 2, 3) ............................................ 40C to 150C QFN ...................................................................260C
PIN CONFIGURATION
TOP VIEW
TOP VIEW
1 V
CAPOK 24
MID
2 V
CMPOUT 23
CAP
3 V
MODE 22
CAP
24 23 22 21 20 19
4 SW1
CMPIN 21
CMPIN 1 18 SW1
5 SW1
FBVCAP 20
FBVCAP 2 17 SW1
6 PGND
SGND 19
25
SGND PGND
3 16
PGND 25
7 PGND
DIR 18
PGND
DIR
4 15 PGND
8 SW2
RUN 17
RUN 5 14 SW2
9 SW2
FB 16
FB 6 13 SW2
10 V
PROG 15
SYS
7 8 9 10 11 12
11 R
CHRG 14
SEN
12 V
SV 13
SYS SYS
UF PACKAGE
FE PACKAGE
24-LEAD (4mm 4mm) PLASTIC QFN
24-LEAD PLASTIC TSSOP
T = 150C, = 37C/W, = 4.5C/W, 4 LAYER BOARD
JMAX JA JC
T = 150C, = 33C/W, = 5C/W, 4 LAYER BOARD
JMAX JA JC
EXPOSED PAD (PIN 25) IS PGND, MUST BE SOLDERED TO PCB
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 40C to 125C
LTC3110IFE#PBF LTC3110IFE#TRPBF LTC3110FE 24-Lead Plastic TSSOP 40C to 125C
LTC3110HFE#PBF LTC3110HFE#TRPBF LTC3110FE 24-Lead Plastic TSSOP 40C to 150C
LTC3110EUF#PBF LTC3110EUF#TRPBF 3110 24-Lead (4mm 4mm) Plastic QFN 40C to 125C
LTC3110IUF#PBF LTC3110IUF#TRPBF 3110 24-Lead (4mm 4mm) Plastic QFN 40C to 125C
LTC3110HUF#PBF LTC3110HUF#TRPBF 3110 24-Lead (4mm 4mm) Plastic QFN 40C to 150C
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
PROG MODE
CHRG CMPOUT
SV CAPOK
SYS
V V
SYS MID
R V
SEN CAP
V V
SYS CAP