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参数资料
| 型号： | LTC3490ES8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER PHOTO FLASH 8-SOIC |
| 标准包装： | 100 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz ~ 1.6MHz |
| 电源电压： | 1 V ~ 3.2 V |
| 输出电压： | 2.8 V ~ 4 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
| 产品目录页面： | 1339 (CN2011-ZH PDF) |
LTC3490
TYPICAL PERFOR A CE CHARACTERISTICS
I LED vs V LED
Efficiency vs I LED
360
358
356
354
352
350
348
346
344
342
340
V IN = 2.4V
100
90
80
70
60
50
40
30
20
10
0
V IN = 2.4V
V IN = 1.2V
2.8
3
3.2
3.4 3.6
3.8
4
0
100
200
300
400
I LED = 500 ? ? CTRL – 0 . 2 ? mA
V LED (V)
3490 G04
PI FU CTIO S
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.
I LED (mA)
3490 G05
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:
? V ?
? V IN ?
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.
LOBAT (Pin 7): Low active, open-drain logic output indi-
cating a low-battery condition.
3490fa
4
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| LTC3499 | 制造商:LINER 制造商全称:Linear Technology 功能描述:750mA Synchronous Step-Up DC/DC Converters with Reverse-Battery Protection |
| LTC3499B | 制造商:LINER 制造商全称:Linear Technology 功能描述:750mA Synchronous Step-Up DC/DC Converters with Reverse-Battery Protection |
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| LTC3499BEDD#PBF | 功能描述:IC REG BOOST SYNC ADJ 0.75A 8DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3499BEDD#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Up 1.8V to 5.5V 8-Pin DFN EP T/R |
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