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LTC4040 Datasheet(PDF) 3 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) 3 Page - Linear Technology

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LTC4040
3
4040fa
For more information www.linear.com/LTC4040
elecTrical characTerisTics The
l
denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at TA = 25°C. (Note 3) VIN = 5V, VBAT = 3.6V, RPROG = 2k, unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VIN
Input Voltage Range
l
3.5
5.5
V
VBAT
Battery Voltage Range (Backup Boost Input)
2.7
5
V
IINQ
VIN Quiescent Current
Normal Mode (VPFI = 2V), Battery Charger Timed Out
Shutdown (BSTOFF = CHGOFF=1)
570
3.5
7
µA
µA
IBATQ
BAT Quiescent Current
Normal Mode (VPFI = 2V), Battery Charger Timed Out
Backup Mode (VIN = VPFI = 0V), No System Load
Shutdown (BSTOFF = CHGOFF = 1)
l
45
40
1.5
70
3
µA
µA
µA
Battery Charger
VCHG
BAT Regulated Output Voltage for LiFePO4
Option (F2 = 0)
F2 = 0, F1 = 0, F0 = 0
F2 = 0, F1 = 0, F0 = 1
F2 = 0, F1 = 1, F0 = 0
F2 = 0, F1 = 1, F0 = 1
l
l
l
l
3.42
3.47
3.52
3.57
3.45
3.50
3.55
3.60
3.48
3.53
3.58
3.63
V
V
V
V
BAT Regulated Output Voltage for Li-Ion
Option (F2 = 1)
F2 = 1, F1 = 0, F0 = 0
F2 = 1, F1 = 0, F0 = 1
F2 = 1, F1 = 1, F0 = 0
F2 = 1, F1 = 1, F0 = 1
l
l
l
l
3.92
3.97
4.02
4.07
3.95
4.00
4.05
4.10
3.98
4.03
4.08
4.13
V
V
V
V
ICHG
Regulated Battery Charge Current
RPROG = 2k
950
1000
1050
mA
VSYS-to-VBAT Differential Undervoltage
Lockout Threshold (Falling)
40
50
60
mV
VSYS-to-BAT Differential Undervoltage
Lockout Threshold (Rising)
125
145
165
mV
VPROG
PROG Pin Servo Voltage
800
mV
hPROG
Ratio of Battery Current to PROG Pin Current
2500
mA/
mA
ITRKL
Trickle Charge Current
VBAT = 2.5V, RPROG = 2k
125
mA
PROG Pin Servo Voltage at Trickle Charge
VBAT = 2.5V, RPROG = 2k
100
mV
Input Current Limit Threshold Voltage
VIN – VCLN
l
23.5
25
26.5
mV
ACLPROG
Input Current Limit Amplifier Gain
Ratio of CLPROG Voltage to (VIN – VCLN)
32
V/V
CLN Input Bias Current
VCLN = VIN
300
nA
VRECHG
Recharge Battery Threshold Voltage
Threshold Voltage Relative to VCHG if F2 = 0 and F1 = 1
Threshold Voltage Relative to VCHG All Other Cases
94.2
96.7
95
97.5
95.8
98.3
%
%
tTERMINATE Safety Timer Termination Period
Timer Starts When VBAT = VCHG
F2 = 1 (Li-Ion)
F2 = 0 (LiFePO4)
3.7
1.85
4.25
2.13
5
2.5
Hours
Hours
VLOWBAT
Low Battery Threshold Voltage for Trickle Charge VBAT Rising
2.75
2.85
2.95
V
�VLOWBAT Low Battery Hysteresis
150
mV
tBADBAT
Bad-Battery Termination Time
VBAT < (VLOWBAT − ΔVLOWBAT)
0.47
0.54
0.64
Hours
VC/8
End-of-Charge Indication
PROG Pin Average Voltage
90
100
110
mV
fOSC(BUCK) Step-Down (Buck) Converter Switching
Frequency
Normal Mode (VPFI > 1.21V)
1.96
2.25
2.65
MHz
RP(BUCK)
High Side Switch On-Resistance
Normal Mode (VPFI > 1.21V)
130
RN(BUCK)
Low Side Switch On-Resistance
Normal Mode (VPFI > 1.21V)
120
ILIM(BUCK) PMOS Switch Current Limit
3
4.3
A


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