3

LTC3490

3490fa

Leakage Current, PMOS Switch

0.1

µA

On-Resistance, PMOS Switch

0.13

Ω

Input High (CELLS)

V

Input High (SHDN)

V

Input Low (CELLS)

0.4

V

Input Low (SHDN)

V

Input Current (CTRL/SHDN, CELLS)

0.01

µA

500

mA/V

On-Resistance, LOBAT Output

●

300

Ω

Input Voltage, Low Battery, 1 Cell

●

0.8

1.12

V

Input Voltage, Low Battery, 2 Cells

●

1.8

2.24

V

●

1.4

1.8

V

2 Cells

●

0.7

0.9

V

1 Cell

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

The

ELECTRICAL CHARACTERISTICS

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 3: The LTC3490 input voltage may drop below the minimum start-up

voltage once the LED voltage has risen above 2.3V.

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.

TYPICAL PERFOR A CE CHARACTERISTICS

Oscillator Frequency

vs Temperature

0

150

200

250

0.6

1

3490 G02

100

50

0

0.2

0.4

0.8

300

350

400

MAXIMUM

MINIMUM

325

350

375

2.5

3490 G03

300

275

250

1

1.5

2

3

TEMPERATURE (

°C)

–50

1.280

1.320

3490 G01

1.240

1.200

0

50

100

1.400

1.360