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LTC4040 Datasheet(PDF) 1 Page - Linear Technology

Part # LTC4040
Description  2.5A Battery Backup Power Manager
Download  26 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4040 Datasheet(HTML) 1 Page - Linear Technology

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background image
LTC4040
1
4040fa
For more information www.linear.com/LTC4040
Typical applicaTion
FeaTures
DescripTion
2.5A Battery Backup
Power Manager
TheLTC®4040isacomplete3.5Vto5.5Vsupplyrailbattery
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
LiFePO4batteryoption,andtwootherlogicinputsprogram
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.
4.5V Backup Application with 4.22V PFI Threshold
(Charge Current Setting: 1A, Input Current Limit Setting: 2A)
Normal to Backup Mode Transition Waveform
applicaTions
n
Step-Up Backup Supply and Step-Down Battery
Charger
n
6.5A Switches for 2.5A Backup from 3.2V Battery
n
Input Current Limit Prioritizes Load Over Charge
Current
n
Input Disconnect Switch Isolates Input During Backup
n
Automatic Seamless Switch-Over to Backup Mode
n
Input Power Loss Indicator
n
System Power Loss Indicator
n
Pin Selectable Battery: Li-Ion (3.95V/4.0V/4.05V/4.1V)
or LiFePO4 (3.45V/3.5V/3.55V/3.6V)
n
Optional OVP Circuitry Protects Device to >60V
n
Constant Frequency Operation
n
Low Profile (0.75mm) 24-Lead 4mm
× 5mm QFN Package
n
Fleet and Asset Tracking
n
Automotive GPS Data Loggers
n
Automotive Telematics Systems
n
Toll Collection Systems
n
Security Systems
n
USB Powered Devices
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.
+
324k
2.2µH
VSYS
PROG
BSTOFF
CHGOFF
F2
F1
F0
IGATE
LTC4040
VIN CLN
1500k
4.5V
12m
10µF
100µF
2.2µF
SYSTEM
LOAD
BSTFB
RSTFB
4.5V INPUT
SUPPLY
SW
BAT
NTC
NTC
VSYS
2k
LiFePO4
3.6V
4040 TA01a
VIN
OVSNS
PFI
FAULT
PFO
RST
CHRG
CLPROG
154k
60.4k
1A
VSYS
VIN
IBAT
VBAT = 3.3V
RPROG = 2k
ISYS = 1A
CSYS = 100µF
TIME (ms)
–0.4
0
0.4
0.8
1.2
–1
0
1
2
3
4
5
–2
0
2
4
6
8
10
Waveform (LiFePO4 App.)
Normal to Backup Mode Transition
4040 TA01b


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