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LTC4080 Datasheet(PDF) 4 Page - Linear Technology

Part # LTC4080
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

LTC4080 Datasheet(HTML) 4 Page - Linear Technology

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LTC4080
4
4080fb
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RON_P
PMOS Switch On-Resistance
0.95
Ω
RON_N
NMOS Switch On-Resistance
0.85
Ω
ILIM_P
PMOS Switch Current Limit
375
520
700
mA
ILIM_N
NMOS Switch Current Limit
700
mA
IZERO_CF
NMOS Zero Current in Normal Mode
15
mA
IPEAK
Peak Current in Burst Mode Operation
MODE = VBAT
50
100
150
mA
IZERO_BM
Zero Current in Burst Mode Operation
MODE = VBAT
20
35
50
mA
tSS_BUCK
Buck Soft-Start Time
From the Rising Edge of EN_BUCK to 90%
of Buck Regulated Output
400
μs
Logic
VIH
Input High Voltage
⎯E⎯N⎯_⎯C⎯H⎯R⎯G, EN_BUCK, MODE Pin Low to High
1.2
V
VIL
Input Low Voltage
⎯E⎯N⎯_⎯C⎯H⎯R⎯G, EN_BUCK, MODE Pin High to Low
0.4
V
VOL
Output Low Voltage (⎯C⎯H⎯R⎯G, ⎯A⎯C⎯P⎯R)
ISINK = 5mA
60
105
mV
IIH
Input Current High
EN_BUCK, MODE Pins at 5.5V, VBAT = 5V
–1
1
μA
IIL
Input Current Low
⎯E⎯N⎯_⎯C⎯H⎯R⎯G, EN_BUCK, MODE Pins at GND
–1
1
μA
R⎯E⎯N⎯_⎯C⎯H⎯R⎯G
⎯E⎯N⎯_⎯C⎯H⎯R⎯G Pin Input Resistance
V⎯E⎯N⎯_⎯C⎯H⎯R⎯G = 5V
11.7
3.3
M
Ω
I⎯C⎯H⎯R⎯G
⎯⎯C⎯H⎯R⎯G Pin Leakage Current
VBAT = 4.5V, V⎯C⎯H⎯R⎯G = 5V
1μA
I⎯A⎯C⎯P⎯R
⎯A⎯C⎯P⎯R Pin Leakage Current
VCC = 3V, V⎯C⎯H⎯R⎯G = 5V
1μA
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: The LTC4080 is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 85°C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Failure to solder the exposed backside of the package to the PC
board ground plane will result in a thermal resistance much higher than
43°C/W.
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
Note 4: Although the LTC4080 charger functions properly at 3.75V, full
charge current requires an input voltage greater than the desired final
battery voltage per
ΔVUVCL1 specification.
Note 5: The 2.8V maximum buck undervoltage lockout (VUVLO_BUCK) exit
threshold must first be exceeded before the minimum VBAT specification
applies.
Note 6: IC/10 is expressed as a fraction of measured full charge current
with indicated PROG resistor.


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