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LTC4041EUFD Datasheet

2.5A Supercapacitor Backup Power Manager

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LTC4041
2.5A Supercapacitor
Backup Power Manager
FEATURES
nn 2.5A Step-Down Supercapacitor Charger and 2.5A
Step-Up Backup Supply
nn 6.5A Switches for 2.5A Backup from One
Supercapacitor or Two in Series
nn Input Current Limit Prioritizes Load over
Charge Current
nn Input Disconnect Switch Isolates Input During Backup
nn Automatic Seamless Switch-Over to Backup Mode
nn Internal Supercapacitor Balancer (No External
Resistors)
nn Programmable Charge Current and Charge Voltage
nn Input Power Fail Indicator
nn System Power Good Indicator
nn Optional OVP Circuitry Protects Device to >60V
nn Constant Frequency Operation
nn Thermally Enhanced 24-Lead 4mm × 5mm
QFN Package
APPLICATIONS
nn Ride-Through “Dying Gasp” Supplies
nn High Current Ride-Through 3V to 5V UPS
nn Power Meters/Industrial Alarms
nn Servers/Solid State Drives
DESCRIPTION
The LTC®4041 is a complete supercapacitor backup sys-
tem for 2.9V to 5.5V supply rails. It contains a high cur-
rent step-down DC/DC converter to charge a single super-
capacitor or two supercapacitors in series. When input
power is unavailable, the step-down regulator operates
in reverse as a step-up regulator to backup the system
output from the supercapacitor(s).
The LTC4041’s adjustable input current limit function
reduces charge current to protect the input supply from
overload while an external disconnect switch isolates the
input supply during backup. When the input supply drops
below the adjustable PFI threshold, the 2.5A boost regula-
tor delivers power from the supercapacitor to the system
output.
An optional input overvoltage protection (OVP) circuit
protects the LTC4041 from high voltage damage at the VIN
pin. An internal supercapacitor balancing circuit maintains
equal voltages across each supercapacitor and limits the
maximum voltage of each supercapacitor to a pre-deter-
mined value. The LTC4041 is available in a low profile
(0.75mm) 24-Lead 4mm × 5mm QFN package.
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents, including 6522118, 6570372, 6700364, 8139329.
TYPICAL APPLICATION
Single Supercapacitor 3.3V Backup Application
3.3V
INPUT
SUPPLY
121k
75k
PINS NOT USED
IN THIS CIRCUIT:
BAL
2.2µF
12mΩ
VIN
OVSNS
CLN
IGATE VSYS
BSTFB
PFI
RSTFB
PFO
SW
SYSGD
LTC4041
SCAP
CAPGD
IMON
CAPFLT
CAPFB
CHGEN BSTEN GND CAPSEL CPF PROG
1nF
1k
1.07M
340k
2.2µH
4041 TA01a
3.3V
SYSTEM
100µF OUTPUT
SUPERCAP
10F
698k
348k
Document Feedback
For more information www.analog.com
Complete Backup Event with
a Single 10F Supercapacitor
VSYSGD
2V/DIV
0V
VSYS
1V/DIV
VIN
1V/DIV
VSCAP
1V/DIV
0V
PBACKUP = 3.3W = 3.3V @ 1A
CSYS = 100µF
3.8 seconds
600ms/DIV
4041 TA01b
Rev A
1


Analog Devices Semiconductor Electronic Components Datasheet

LTC4041EUFD Datasheet

2.5A Supercapacitor Backup Power Manager

No Preview Available !

LTC4041
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN (Transient) t < 1ms, Duty Cycle < 1%...... –0.3V to 7V
VIN (Steady State), SCAP, BAL, CLN,
VSYS, BSTFB, PFI, CPF, CAPFB, CAPFLT,
PFO, SYSGD, OVSNS, IMON.............................–0.3V to 6V
BSTEN, CHGEN, CAPGD, RSTFB,
CAPSEL............ –0.3V to [Max (VIN, VSCAP, VSYS) +0.3V]
IOVSNS................................................................... ±10mA
ICAPGD, IPFO, ISYSGD................................................10mA
IPROG.....................................................................–1.1mA
Operating Junction Temperature Range
(Notes 2, 3)............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
VSYS 1
PROG 2
IMON 3
CHGEN 4
BSTEN 5
VIN 6
CLN 7
24 23 22 21 20
19 PFI
18 BSTFB
17 CPF
25
GND
16 OVSNS
15 IGATE
14 PFO
13 CAPGD
8 9 10 11 12
UFD PACKAGE
24-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°C/W, θJC = 3.4°C/W
EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC4041EUFD#PBF
LTC4041EUFD#TRPBF 4041
24-Lead (4mm × 5mm × 0.75mm)
Plastic QFN
–40°C TO 125°C
LTC4041IUFD#PBF
LTC4041IUFD#TRPBF 4041
24-Lead (4mm × 5mm × 0.75mm)
Plastic QFN
–40°C TO 125°C
Consult ADI Marketing for parts specified with wider operating temperature ranges.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
Rev A
2
For more information www.analog.com


Part Number LTC4041EUFD
Description 2.5A Supercapacitor Backup Power Manager
Maker Analog Devices
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