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参数资料
| 型号： | LTC3217EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/12页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR FLASH TORCH 16QFN |
| 标准包装： | 121 |
| 拓扑： | PWM，升压（升压），切换式电容器（充电泵） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 闪灯/白光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 600kHz ~ 1.15MHz |
| 电源电压： | 2.9 V ~ 4.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
LTC3217
PACKAGE DESCRIPTION
At moderate to high output power, the quiescent current
of the LTC3217 is negligible and the expression shown in
of 2 times the actual input voltage. In an ideal 2x charge
pump, the power ef?ciency would be given by:
= =
Equation 6 is valid.
Once dropout is detected at the LED pin, the LTC3217
enables the charge pump in 1.5x mode.
η IDEAL =
P LED
P IN
( V LED ? I LED ) V LED
( V BAT ? ( 2 ) ? I LED ) ( 2 ? V BAT )
(8)
In 1.5x boost mode, the ef?ciency is similar to that of a
linear regulator with an effective input voltage of 1.5 times
the actual input voltage. This is because the input current
for a 1.5x charge pump is approximately 1.5 times the
load current. In an ideal 1.5x charge pump, the power
ef?ciency would be given by:
Thermal Management
For higher input voltages and maximum output current,
there can be substantial power dissipation in the LTC3217.
If the junction temperature increases above approximately
150°C the thermal shutdown circuitry will automatically
deactivate the output current sources and charge pump.
= =
η IDEAL =
P LED
P IN
( V LED ? I LED ) V LED
( V BAT ? ( 1 . 5 ) ? I LED ) ( 1 . 5 ? V BAT )
(7)
To reduce maximum junction temperature, a good thermal
connection to the PC board is recommended. Connecting
the Exposed Pad to a ground plane and maintaining a solid
Similarly, in 2x boost mode, the ef?ciency is similar to
that of a linear regulator with an effective input voltage
ground plane under the device will reduce the thermal
resistance of the package and PC board considerably.
PACKAGE DESCRIPTION
UD Package
16-Lead Plastic QFN (3mm × 3mm)
(Reference LTC DWG # 05-08-1691)
BOTTOM VIEW—EXPOSED PAD
3.50 ± 0.05 1.45 ± 0.05
2.10 ± 0.05 (4 SIDES)
0.70 ± 0.05
3.00 ± 0.10
(4 SIDES)
PIN 1
TOP MARK
(NOTE 6)
0.75 ± 0.05
1.45 ± 0.10
(4-SIDES)
R = 0.115
TYP
15
16
PIN 1 NOTCH R = 0.20 TYP
OR 0.25 × 45 ° CHAMFER
0.40 ± 0.10
1
2
PACKAGE
OUTLINE
(UD16) QFN 0904
0.25 ± 0.05
0.50 BSC
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
NOTE:
0.200 REF
0.00 – 0.05
0.25 ± 0.05
0.50 BSC
1. DRAWING CONFORMS TO JEDEC PACKAGE OUTLINE MO-220 VARIATION (WEED-2)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON THE TOP AND BOTTOM OF PACKAGE
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
3217fa
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
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相关代理商/技术参数 |
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| LTC3218 | 制造商:LINER 制造商全称:Linear Technology 功能描述:400mA Single Wire Camera LED Charge Pump |
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| LTC3218EDDB#TRPBF | 功能描述:IC LED DRVR FLASH TORCH 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - LED 驱动器 系列:- 标准包装:6,000 系列:- 恒定电流:- 恒定电压:- 拓扑:开路漏极，PWM 输出数:4 内部驱动器:是 类型 - 主要:LED 闪烁器 类型 - 次要:- 频率:400kHz 电源电压:2.3 V ~ 5.5 V 输出电压:- 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘 供应商设备封装:8-HVSON 包装:带卷 (TR) 工作温度:-40°C ~ 85°C 其它名称:935286881118PCA9553TK/02-TPCA9553TK/02-T-ND |
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