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参数资料
| 型号： | LTC3217EUD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/12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
BLOCK DIAGRAM
1
C1P
14
C1M
16
C2P
12
C2M
850kHz
OSCILLATOR
15
V BAT
GND1
CPO
13
2
CHARGE PUMP
–
+
ENABLE CP
+
CPO
+
–
SHORT-CIRCUIT
PROTECTION
–
9
10
3
I SET1
I SET2
EN1
MUX
–
1.22V
CONTROL LOGIC
LED CURRENT
SOURCES
4
+
0.8V
LED1
LED2
LED3
LED4
GND2
4
5
6
7
8
250k
11
EN2
PWM TIMING
THERMAL
SHUTDOWN
250k
3217 BD
OPERATION
Power Management
The LTC3217 uses a switched capacitor charge pump to
boost CPO to as much as 2 times the input voltage up to
5.1V. The parts start up in 1x mode. In this mode, V BAT is
connected directly to CPO. This mode provides maximum
ef?ciency and minimum noise. The LTC3217 will remain in
1x mode until an LED current source drops out. Dropout
occurs when a current source voltage becomes too low
for the programmed current to be supplied. When dropout
is detected, the LTC3217 will switch into 1.5x mode. The
CPO voltage will then start to increase and will attempt to
reach 1.5x V BAT up to 4.5V. Any subsequent dropout will
cause the part to enter the 2x mode. The CPO voltage will
attempt to reach 2x V BAT up to 5.05V. The LTC3217 will be
reset to 1x mode whenever the part is shut down.
A two phase non-overlapping clock activates the charge
pump switches. In the 2x mode the ?ying capacitors are
charged on alternate clock phases from V BAT to minimize
input current ripple and CPO voltage ripple. In 1.5x mode
the ?ying capacitors are charged in series during the ?rst
clock phase and stacked in parallel on V BAT during the
second phase. This sequence of charging and discharging
the ?ying capacitors continues at a constant frequency
of 850kHz.
3217fa
6
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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 |
| 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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