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參數(shù)資料
| 型號： | LT3479 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | LED驅(qū)動器 |
| 英文描述： | Single Cell 350mA LED Driver |
| 中文描述： | 單細胞350mA的LED驅(qū)動器 |
| 文件頁數(shù)： | 3/12頁 |
| 文件大?。?/td> | 123K |
| 代理商： | LT3479 |
3
LTC3490
3490f
SYMBOL
I
IN
K
CTRL
R
ON(LOBAT)
V
IN(LOBAT1)
V
IN(LOBAT2)
V
IN(UVLO2)
PARAMETER
Input Current (CTRL/SHDN, CELLS)
Control Gain, I
LED
/V
CTRL
On Resistance, LOBAT Output
Input Voltage, Low Battery, 1 Cell
Input Voltage, Low Battery, 2 Cells
Input Voltage, Undervoltage Lockout, V
CELLS
= V
IN
2 Cells
Input Voltage, Undervoltage Lockout, V
CELLS
= 0 V
1 Cell
CONDITIONS
MIN
TYP
0.01
500
MAX
UNITS
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.
ELECTRICAL CHARACTERISTICS
μ
A
Scales Linearity with V
IN
, V
IN
= 1V
V
IN
Below UVLO Threshold
V
CELLS
= 0V
V
CELLS
= V
IN
mA/V
●
300
1.12
2.24
1.8
V
V
V
●
0.8
1.8
1.4
●
●
V
IN(UVLO1)
●
0.7
0.9
V
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
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 U
Oscillator Frequency
vs Temperature
I
LED
vs V
CTRL
V
CTRL
/V
IN
(V)
0
I
L
150
200
250
0.6
1
3490 G02
100
50
0
0.2
0.4
0.8
300
350
400
MAXIMUM
MINIMUM
I
LED
vs V
IN
V
IN
(V)
I
L
325
350
375
2.5
3490 G03
300
275
250
1
1.5
2
3
V
LED
= 3.5V
TEMPERATURE (
°
C)
–50
F
1.280
1.320
3490 G01
1.240
1.200
0
50
100
1.400
1.360
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