参数资料
| 型号： | LTC3216EDE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC CHARGE PUMP LED 12-DFN |
| 标准包装： | 2,500 |
| 应用： | 转换器，高电流 LED |
| 输入电压： | 2.9 V ~ 4.4 V |
| 输出数： | 1 |
| 输出电压： | 多重 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WFDFN 裸露焊盘 |
| 供应商设备封装： | 12-DFN（4x3） |
| 包装： | 带卷 (TR) |
LTC3216
BLOCK DIAGRAM
C1 +
2
C1 –
12
C2 +
1
C2 –
10
3 CPO
1x MODE: CPO = V IN
OSCILLATOR
–
1.5x MODE: CPO = 4.6V
2x MODE: CPO = 5.1V
+
V REF
V IN 9
MODE
CONTROL
DROPOUT
DETECTOR
5 I LED
EN2 8
EN1 7
CONTROL
LOGIC
CURRENT
SOURCE
CONTROL
11
GND
6
I SET2
4
I SET1
13
GND
3216 BD
OPERATION
The LTC3216 uses a fractional switched capacitor charge
pump to power a high current LED with a programmed
regulated current. The part starts up into the 1x mode. In
this mode, V IN is directly connected to CPO. This mode
provides maximum ef?ciency and minimum noise. The
LTC3216 will remain in this mode until the LED current
source begins to dropout. When dropout is detected,
the LTC3216 will switch to 1.5x mode after a soft-start
period. Any subsequent dropout detected will cause the
part to enter 2x mode. The part may be reset to 1x mode
by bringing the part into shutdown mode and then reen-
abling the part.
A two phase nonoverlapping clock activates the charge
pump switches. In the 2x mode, the ?ying capacitors are
charged on alternate clock phases from V IN . While one
capacitor is being charged from V IN , the other is stacked
on top of V IN and connected to the output. Alternatively, in
the 1.5x mode the ?ying capacitors are charged in series
during the ?rst clock phase, and stacked in parallel on
top of V IN on the second clock phase. This sequence of
charging and discharging the ?ying capacitors continues
at a free running frequency of 900kHz (typ).
The current delivered to the LED load is controlled by the
internal programmable current source. Three discrete
current settings (Low, High and Low + High) are avail-
able and may be selected via the EN2 and EN1 pins. The
values of these currents may be selected by choosing
the appropriate programming resistors. Each resistor is
3216fc
6
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相关代理商/技术参数 |
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| LTC3217 | 制造商:LINER 制造商全称:Linear Technology 功能描述:600mA Low Noise Multi-LED Camera Light Charge Pump |
| LTC3217EUD | 制造商:Linear Technology 功能描述:LED DRVR 4Segment 3.3V 16-Pin QFN EP |
| LTC3217EUD#PBF | 功能描述:IC LED DRVR FLASH TORCH 16QFN 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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| 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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