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参数资料
| 型号： | LTC3217EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/12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
600mA Low Noise
Multi-LED Camera Light
Charge Pumps
FEATURES
DESCRIPTION
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Charge Pump Provides High Ef?ciency with
Automatic Mode Switching
Multimode Operation: 1x, 1.5x, 2x
Four Low Dropout LED Outputs
Up to 600mA Total Output Current
Independent Torch and Flash I SET and Enable Pins
Low Noise Constant Frequency Operation*
PWM Brightness Control via the EN2 Pin
Low Shutdown Current: 4μA
Internal Soft-Start Limits Inrush Current During
Start-Up and Mode Switching
Open/Short LED Protection
No Inductors
(3mm x 3mm) 16-Lead QFN Plastic Package
The LTC ? 3217 is a low noise charge pump DC/DC converter
designed to power four high current LEDs. The LTC3217
requires only four small ceramic capacitors and two cur-
rent set resistors to form a complete LED power supply
and current controller.
Built-in soft-start circuitry prevents excessive inrush cur-
rent during start-up and mode changes. High switching
frequency enables the use of small external capacitors.
Independent high and low current settings are programmed
by two external resistors. Shutdown mode and current
output levels are selected via two logic inputs.
The current through the LEDs is programmed via I SET1
and I SET2 . In addition, the brightness can be controlled
by pulse width modulation of the EN2 pin.
Multi-LED Camera Light Supply for Cellphones/
APPLICATIONS
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DSCs/PDAs
L , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. *Protected by U.S. Patents including
6411531.
The charge pump optimizes ef?ciency based on the volt-
age across the LED current sources. The part powers up
in 1x mode and will automatically switch to boost mode
whenever any enabled LED current source begins to enter
dropout. The ?rst dropout switches the part into 1.5x
mode and a subsequent dropout switches the part into
2x mode. The LTC3217 resets to 1x mode whenever the
part is shut down.
The LTC3217 is available in a low profile 16-lead
(3mm × 3mm × 0.75mm) QFN package.
TYPICAL APPLICATION
C2
2.2μF
C3
2.2μF
Ef?ciency vs V BAT
V BAT
C1
2.2μF
C1P
V BAT
C1M C2P
LTC3217
C2M
CPO
C4
2.2μF
AOT-2015HPW-1751B
100
90
80
70
60
100mA 200mA
400mA
LED1
LED2
50
40
EN1 (TORCH)
EN2 (FLASH)
EN1
EN2
I SET1
19.6k
1%
LED3
LED4
I SET2 GND
6.49k
1%
EN1
0
1
0
1
EN2
0
0
1
1
I LED
0 (SHUTDOWN)
25mA/LED
75mA/LED
100mA/LED
3217 TA01
30
20
10
0
3
TOTAL OUTPUT CURRENT
P LED /PIN
LED = 2015 HPW AOT
3.2 3.4 3.6 3.8
V BAT (V)
4
4.2 4.4
3217 TA01b
3217fa
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3218 | 制造商:LINER 制造商全称:Linear Technology 功能描述:400mA Single Wire Camera LED Charge Pump |
| LTC3218EDDB#PBF | 制造商:Linear Technology 功能描述:DP-Charge Pump/LED Driver, CUT TAPE 400mA, Single Wire Camera LED Charge Pump |
| LTC3218EDDB#TRMPBF | 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 |
| 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 |
| LTC3218EDDBPBF | 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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