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LTC3490
ELECTRICAL CHARACTERISTICS The ● denotes specifications which apply over the full operating
temperature range, otherwise specifications are T A = 25 ° C. V IN = 2.5V unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
I L(PMOS)
R ON(PMOS)
V IH
V IL
I IN
Leakage Current, PMOS Switch
On-Resistance, PMOS Switch
Input High (CELLS)
Input High (SHDN)
Input Low (CELLS)
Input Low (SHDN)
Input Current (CTRL/SHDN, CELLS)
V IN – 0.4
0.1
0.13
V IN ? 0.9
V IN ? 0.2
0.01
0.4
μ A
?
V
V
V
V
μ A
K CTRL
Control Gain, I LED /V CTRL
Scales Linearity with V IN , V IN = 1V
500
mA/V
R ON(LOBAT)
On-Resistance, LOBAT Output
V IN < V IN(LOBAT)
●
300
?
V IN(LOBAT1)
V IN(LOBAT2)
Input Voltage, Low Battery, 1 Cell
Input Voltage, Low Battery, 2 Cells
V CELLS = 0V
V CELLS = V IN
●
●
0.8
1.8
1.12
2.24
V
V
V IN(UVLO2)
Input Voltage, Undervoltage Lockout, V CELLS = V IN
●
1.4
1.8
V
2 Cells
V IN(UVLO1)
Input Voltage, Undervoltage Lockout, V CELLS = 0 V
●
0.7
0.9
V
1 Cell
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 LTC3490 is guaranteed to meet performance specifications
from 0 ° C to 70 ° C. Specifications over the –40 ° C to 85 ° C range are
assured by design, characterization and correlation with statistical process
controls.
Note 4: This device includes overtemperature protection intended to
protect the device during momentary overload conditions. The maximum
junction temperature may be exceeded when overtemperature protection
is active. Continuous operation above the specified maximum operating
junction temperature may result in device degradation or failure.
Note 5: The Exposed Pad of the DFN package must be soldered to a
PCB pad for optimum thermal conductivity. This pad must be connected
to ground.
Note 3: The LTC3490 input voltage may drop below the minimum start-up
voltage once the LED voltage has risen above 2.3V.
TYPICAL PERFOR A CE CHARACTERISTICS
Oscillator Frequency
vs Temperature
I LED vs V CTRL
I LED vs V IN
1.400
400
375
V LED = 3.5V
350
1.360
300
350
1.320
250
MAXIMUM
325
200
1.280
1.240
150
100
50
MINIMUM
300
275
1.200
–50
0
50
100
0
0
0.2
0.4
0.6
0.8
1
250
1
1.5
2
2.5
3
TEMPERATURE ( ° C)
3490 G01
V CTRL /V IN (V)
3490 G02
V IN (V)
3490 G03
3490fa
3
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