參數(shù)資料
型號(hào): LTC3205
廠商: Linear Technology Corporation
元件分類: LED驅(qū)動(dòng)器
英文描述: Single Cell 350mA LED Driver
中文描述: 單細(xì)胞350mA的LED驅(qū)動(dòng)器
文件頁數(shù): 4/12頁
文件大小: 123K
代理商: LTC3205
4
LTC3490
3490f
PIU
CELLS (Pin 1):
A logic input to set the low-battery and
undervoltage shutdown thresholds. A logic low (tied to
GND) will set the thresholds for 1 cell. A logic high (tied to
V
IN
) will set the thresholds for 2 cells.
V
IN
(Pin 2):
Supply Voltage.
SW (Pin 3):
Switch Input. Connect this pin to an external
inductor from V
IN
.
GND (Pin 4):
Circuit Ground.
LED (Pin 5):
Output Drive Current to LED.
CAP (Pin 6):
Filter Capacitor. A 4.7
μ
F low ESR capacitor
should be tied to this pin.
LOBAT (Pin 7):
Low active, open-drain logic output indi-
cating a low-battery condition.
CTRL/SHDN (Pin 8):
Analog Control Voltage and Shut-
down. When V
IN
0.2 < V
CTRL
< V
IN
0.9, the LED drive
current varies according to the formula:
I
V
V
mA
LED
CTRL
IN
=
500
–0 2
When V
CTRL
> V
IN
0.9, the LED drive current is clamped
at 350mA. When V
CTRL
< V
IN
0.2, then the part is in low
power shutdown.
Exposed Pad (Pin 9, DD Package):
Ground. This pin must
be soldered to the PCB to provide both electrical contact
to ground and good thermal contact to the PCB.
I
LED
vs V
LED
V
LED
(V)
2.8
340
I
L
342
346
348
350
360
354
3
3.2
3.4
3.6
3.8
3490 G04
344
356
358
352
4
V
IN
= 2.4V
TYPICAL PERFOR U
I
LED
(mA)
0
0
E
10
30
40
50
100
70
100
200
3490 G05
20
80
90
60
300
400
V
IN
= 2.4V
V
IN
= 1.2V
Efficiency vs I
LED
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