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Linear Technology Electronic Components Datasheet

LTC4040 Datasheet

2.5A Battery Backup Power Manager

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LTC4040
2.5A Battery Backup
Power Manager
Features
Description
nn Step-Up Backup Supply and Step-Down Battery
Charger
nn 6.5A Switches for 2.5A Backup from 3.2V Battery
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 Input Power Loss Indicator
nn System Power Loss Indicator
nn Pin Selectable Battery: Li-Ion (3.95V/4.0V/4.05V/4.1V)
or LiFePO4 (3.45V/3.5V/3.55V/3.6V)
nn Optional OVP Circuitry Protects Device to >60V
nn Constant Frequency Operation
nn Low Profile (0.75mm) 24-Lead 4mm × 5mm QFN Package
Applications
nn Fleet and Asset Tracking
nn Automotive GPS Data Loggers
nn Automotive Telematics Systems
nn Toll Collection Systems
nn Security Systems
nn USB Powered Devices
The LTC®4040 is a complete 3.5V to 5.5V supply rail battery
backup system. It contains a high current step-up DC/DC
regulator to back up the supply from a single-cell Li-Ion
or LiFePO4 battery. When external power is available,
the step-up regulator operates in reverse as a step-down
battery charger.
The LTC4040’s adjustable input current limit function
reduces charge current to protect the main supply from
overload while an external disconnect switch isolates the
external supply during backup. When the input supply
drops below the adjustable PFI threshold, the 2.5A boost
regulator delivers power from the battery to the system
output.
An optional input overvoltage protection (OVP) circuit
protects the LTC4040 from high voltage damage at the
VIN pin. One logic input selects either the Li-Ion or the
LiFePO4 battery option, and two other logic inputs program
the battery charge voltage to one of four levels suitable
for backup applications. The LTC4040 is available in a low
profile (0.75mm) 24-Lead 4mm × 5mm QFN package.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners. Protected by U.S. Patents, including 6522118, 6570372,
6700364, 8139329.
Typical Application
4.5V Backup Application with 4.22V PFI Threshold
(Charge Current Setting: 1A, Input Current Limit Setting: 2A)
4.5V INPUT
SUPPLY
2.2µF
12mΩ
4.5V
1500k
1A
SYSTEM
LOAD
100µF
154k
60.4k
VIN CLN
OVSNS
PFI
IGATE
VSYS
BSTFB
RSTFB
FAULT
PFO
RST
CHRG
CLPROG
LTC4040
CHGOFF BSTOFF F0 F1 F2
SW
BAT
NTC
PROG
VSYS
2k
324k
2.2µH
VIN
10µF
NTC +
LiFePO4
3.6V
4040 TA01a
Normal to Backup Mode Transition
NormaWlatoveBfoarcmku(pLiMFeoPdeO4TrAapnps.it)ion Waveform
5
VSYS
10
48
VBAT = 3.3V
3
VIN
ISYS = 1A
CSYS = 100µF
RPROG = 2k
6
24
1 IBAT 2
00
–1
–0.4
–2
0 0.4 0.8 1.2
TIME (ms)
4040 TA01b
For more information www.linear.com/LTC4040
4040fa
1


Linear Technology Electronic Components Datasheet

LTC4040 Datasheet

2.5A Battery Backup Power Manager

No Preview Available !

LTC4040
Absolute Maximum Ratings
(Notes 1, 2)
VIN (Transient) t < 1ms, Duty Cycle < 1%..... –0.3V to 7V
VIN (Steady State), BAT, CLN, VSYS,
BSTFB, NTC, OVSNS,
CHRG, PFO, RST, FAULT................................ –0.3V to 6V
F0, F1, F2, BSTOFF, RSTFB,
PFI, CHGOFF .......–0.3V to Max (VIN, VBAT, VSYS) + 0.3V
IOVSNS................................................................... ±10mA
ICHRG, IPFO, IRST, IFAULT...........................................10mA
IPROG, ICLPROG....................................................... 1.1mA
Operating Junction Temperature Range
(Note 3)....................................................... –40 to 125°C
Storage Temperature Range....................... –65 to 125°C
Pin Configuration
TOP VIEW
VSYS 1
PROG 2
CLPROG 3
CHGOFF 4
BSTOFF 5
VIN 6
CLN 7
24 23 22 21 20
19 PFI
18 BSTFB
17 NTC
25
GND
16 OVSNS
15 IGATE
14 F0
13 F1
8 9 10 11 12
UFD PACKAGE
24-LEAD (4mm × 5mm) PLASTIC QFN
TJMAX = 125°C, θJA = 43°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
LTC4040EUFD#PBF
LTC4040EUFD#TRPBF 4040
24-Lead (4mm × 5mm × 0.75mm) Plastic QFN –40°C to 125°C
LTC4040IUFD#PBF
LTC4040IUFD#TRPBF 4040
24-Lead (4mm × 5mm × 0.75mm) Plastic QFN –40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on nonstandard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
4040fa
2 For more information www.linear.com/LTC4040


Part Number LTC4040
Description 2.5A Battery Backup Power Manager
Maker Linear Technology
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