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LTC4080X Datasheet(PDF) 3 Page - Linear Technology

Part # LTC4080X
Description  500mA Standalone Li-Ion Charger with Integrated 300mA Synchronous Buck
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4080X Datasheet(HTML) 3 Page - Linear Technology

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LTC4080X
3
4080Xf
The denotes specifications which apply over the full operating tempera-
ture range, otherwise specifications are at TA = 25°C, VCC = 5V, VBAT = 3.8V, V⎯E⎯N⎯_⎯C⎯H⎯R⎯G = 0V, VEN_BUCK = VBAT, VMODE = 0V. (Note 2)
ELECTRICAL CHARACTERISTICS
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VCC
Battery Charger Supply Voltage
(Note 4)
3.75
5
5.5
V
VBAT
Input Voltage for the Switching
Regulator
(Note 5)
2.7
3.8
4.5
V
ICC
Quiescent Supply Current (Charger On,
Switching Regulator Off)
VBAT = 4.5V (Forces IBAT and IPROG = 0),
VEN_BUCK = 0
110
300
µA
ICC_SD
Supply Current in Shutdown (Both
Battery Charger and Switching
Regulator Off)
V⎯E⎯N⎯_⎯C⎯H⎯R⎯G = 5V, VEN_BUCK = 0, VCC > VBAT
V⎯E⎯N⎯_⎯C⎯H⎯R⎯G = 4V, VEN_BUCK = 0, VCC (3.5V) <
VBAT (4V)
5
2
10
µA
µA
IBAT_SD
Battery Current in Shutdown (Both
Battery Charger and Switching
Regulator Off)
V⎯E⎯⎯N⎯_⎯C⎯H⎯R⎯G = 5V, VEN_BUCK = 0, VCC > VBAT
V⎯E⎯⎯N⎯_⎯C⎯H⎯R⎯G = 4V, VEN_BUCK = 0, VCC (3.5V) <
VBAT (4V)
0.6
2
5µA
µA
Battery Charger
VFLOAT
VBAT Regulated Output Voltage
IBAT = 2mA
IBAT = 2mA, 4.3V < VCC < 5.5V
4.179
4.158
4.2
4.2
4.221
4.242
V
V
IBAT
Current Mode Charge Current
RPROG = 4k; Current Mode; VEN_BUCK = 0
RPROG = 0.8k; Current Mode; VEN_BUCK = 0
90
475
100
500
110
525
mA
mA
VUVLO_CHRG
VCC Undervoltage Lockout Voltage
VCC Rising
VCC Falling
3.5
2.8
3.6
3.0
3.7
3.2
V
V
VPROG
PROG Pin Servo Voltage
0.8k ≤ RPROG ≤ 4k
0.98
1.0
1.02
V
VASD
Automatic Shutdown Threshold Voltage (VCC – VBAT), VCC Low to High
(VCC – VBAT), VCC High to Low
60
15
82
32
100
45
mV
mV
tSS_CHRG
Battery Charger Soft-Start Time
180
µs
VBADBAT
Bad Battery Threshold Voltage
2.9
V
ΔVRECHRG
Recharge Battery Threshold Voltage
VFLOAT – VBAT, 0°C < TA < 85°C
70
100
130
mV
ΔVUVCL1,
ΔVUVCL2
(VCC – VBAT) Undervoltage Current
Limit Threshold Voltage
IBAT = 0.9 ICHG
IBAT = 0.1 ICHG
180
90
300
130
mV
mV
tTIMER
Charge Termination Timer
3
4.5
6
hrs
Recharge Time
1.5
2.25
3
hrs
Low-Battery Charge Time
VBAT = 2.5V
0.75
1.125
1.5
hrs
IC/10
End of Charge Indication Current Level
RPROG = 2k (Note 6)
0.085
0.1
0.115
mA/mA
TLIM
Junction Temperature in Constant-
Temperature Mode
115
°C
RON_CHRG
Power FET On-Resistance (Between
VCC and BAT)
IBAT = 350mA, VCC = 4V
750
fBADBAT
Defective Battery Detection
⎯C⎯H⎯R⎯G Pulse
Frequency
VBAT = 2V
2
Hz
DBADBAT
Defective Battery Detection
⎯C⎯H⎯R⎯G Pulse
Frequency Duty Ratio
VBAT = 2V
75
%
Buck Converter
VFB
FB Servo Voltage
0.78
0.80
0.82
V
IFB
FB Pin Input Current
VFB = 0.85V
–50
50
nA
fOSC
Switching Frequency
1.8
2.25
2.75
MHz
IBAT_NL_CF
No-Load Battery Current (Continuous
Frequency Mode)
No-Load for Regulator, V⎯E⎯N⎯_⎯C⎯H⎯R⎯G = 5V,
L = 10µH, C = 4.7µF
1.9
mA


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