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参数资料
| 型号： | LTC3208EUH#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/24页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR QVGA DISPLAY 32-QFN |
| 标准包装： | 2,500 |
| 拓扑： | 升压（升压），切换式电容器（充电泵） |
| 输出数： | 17 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 600kHz ~ 1.2MHz |
| 电源电压： | 2.9 V ~ 4.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-QFN |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LTC3208
BLOCK DIAGRA
C1P
31
C1M
27
C2P
29
C2M
26
900kHz
V BAT1 30
OSCILLATOR
25 GND
V BAT2 24
32 CPO
V BAT3 12
–
+
CHARGE PUMP
15 MAIN1
ENABLE CP
16 MAIN2
+
17 MAIN3
–
R REF 13
MAIN CURRENT
SOURCES
4
18 MAIN4
DV CC 14
ENRGBS 28
1.215V
CONTROL
LOGIC
SUB CURRENT
SOURCES
AUX CURRENT
2
4
19 SUB2
20 SUB1
SOURCES
MASTER/
CAMHL
9
SLAVE REG
CAM CURRENT
4
5 AUX1
SOURCES
SDA 11
SHIFT
REGISTER
3
RGB CURRENT
SOURCES
6 AUX2
SCL 10
23
RED
22
GRN
21
BLUE
1
CAM1
2
CAM2
3
CAM3
4
CAM4
8
AUX4
7
AUX3
3208 BD
OPERATIO
Power Management
The LTC3208 uses a switched capacitor charge pump to
boost CPO to as much as 2 times the input voltage up to
5V. The part starts up in 1x mode. In this mode, V BAT1,2 are
connected directly to CPO. This mode provides maximum
ef?ciency and minimum noise. The LTC3208 will remain in
this 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 LTC3208 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 5V. The part will be reset to
1x mode whenever a DAC data bit is updated via the I 2 C
port or on the falling edge of the CAMHL signal.
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 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
900kHz.
The currents delivered by the LED current sources are
controlled by an associated DAC. Each DAC is programmed
via the I 2 C port. The full scale DAC currents are set by R REF .
The value of R REF is limited to the range of 22k to 30k.
3208fa
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3209-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:600mA Main/Camera LED Controller |
| LTC3209-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:600mA Main/Camera LED Controller |
| LTC3209EUF-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:600mA Main/Camera LED Controller |
| LTC3209EUF-1#PBF | 功能描述:IC LED DRIVR QVGA DISPLAY 20-QFN 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 |
| LTC3209EUF-1#TRPBF | 功能描述:IC LED DRIVR QVGA DISPLAY 20-QFN 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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