ltc3490 Linear Technology Corporation, ltc3490 Datasheet - Page 3

• Manufacturer Part Number: ltc3490
• Description: Single Cell 350ma Led Driver
• Manufacturer: Linear Technology Corporation

SYMBOL
I
R
V
V
I
K
R
V
V
V
V
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.
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are T
TYPICAL PERFOR A CE CHARACTERISTICS
L(PMOS)
IN
IH
IL
CTRL
IN(LOBAT1)
IN(LOBAT2)
IN(UVLO2)
IN(UVLO1)
ON(PMOS)
ON(LOBAT)
1.360
1.280
1.400
1.320
1.200
1.240
–50
Oscillator Frequency
vs Temperature
PARAMETER
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)
Control Gain, I
On-Resistance, LOBAT Output
Input Voltage, Low Battery, 1 Cell
Input Voltage, Low Battery, 2 Cells
Input Voltage, Undervoltage Lockout, V
2 Cells
Input Voltage, Undervoltage Lockout, V
1 Cell
TEMPERATURE (°C)
0
LED
/V
50
CTRL
W
3490 G01
U
100
CONDITIONS
Scales Linearity with V
V
V
V
IN
CELLS
CELLS
CELLS
CELLS
200
100
A
< V
400
350
300
250
150
50
= 25°C. V
0
IN(LOBAT)
= 0V
= V
= V
= 0 V
0
I
LED
IN
IN
vs V
The
0.2
IN
CTRL
●
= 2.5V unless otherwise specified.
MAXIMUM
denotes specifications which apply over the full operating
V
IN
0.4
CTRL
, V
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.
/V
IN
IN
MINIMUM
= 1V
0.6
(V)
0.8
3490 G02
1
●
●
●
●
●
375
350
300
275
250
325
V
IN
1
I
MIN
0.8
1.8
1.4
0.7
LED
V
– 0.4
LED
vs V
= 3.5V
1.5
V
V
IN
IN
IN
0.13
0.01
TYP
500
0.1
• 0.9
• 0.2
V
IN
LTC3490
2
(V)
MAX
1.12
2.24
300
0.4
1.8
0.9
2.5
UNITS
mA/V
3490fa
3490 G03
3
µA
µA
Ω
Ω
V
V
V
V
V
V
V
V
3