- 您现在的位置：买卖IC网 > Sheet目录338 > LTC3210EUD#TRPBF (Linear Technology)IC LED DRIVR WHITE BCKLGT 16-QFN
LTC3210
OPERATION
Power Management
The LTC3210 uses a switched capacitor charge pump to
boost CPO to as much as 2 times the input voltage up to
5.1V. The part starts up in 1x mode. In this mode, V BAT is
connected directly to CPO. This mode provides maximum
efficiency and minimum noise. The LTC3210 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 LTC3210 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 4.6V. Any subsequent dropout
will cause the part to enter the 2x mode. The CPO voltage
will attempt to reach 2x V BAT up to 5.1V. The part will be
reset to 1x mode whenever the part is shut down or when
ENC goes low.
A two phase nonoverlapping clock activates the charge
pump switches. In the 2x mode the flying capacitors are
charged on alternate clock phases from V BAT to minimize
input current ripple and CPO voltage ripple. In 1.5x mode the
flying capacitors are charged in series during the first clock
phase and stacked in parallel on V BAT during the second
phase. This sequence of charging and discharging the flying
capacitors continues at a constant frequency of 800kHz.
LED Current Control
The MLED currents are delivered by the four programmable
current sources. Eight current settings (0mA to 20mA,
RM = 30.1k) are available by strobing the ENM pin. Each
positive strobe edge decrements a 3-bit down counter
which controls an exponential DAC. When the desired
current is achieved ENM is stopped high. The output cur-
rent then changes to the programmed value after 150μs
(typ). The counter will stop when the LSB is reached. The
output current is set to 0 when ENM is toggled low after
the output has been enabled. If strobing is started within
150μs (typ), after ENM has been set low, the counter will
continue to count down. After 150μs (typ) the counter
is reset.
The CLED current is delivered by a programmable current
source. Eight linear current settings (0mA to 380mA, RC
= 24.3k) are available by strobing the ENC pin. Each posi-
tive strobe edge decrements a 3-bit down counter which
controls a 3-bit linear DAC. When the desired current is
reached, ENC is stopped high. The output current then
changes to the programmed value after 150μs (typ). The
counter will stop when the LSB is reached. The output
current is set to 0 when ENC is toggled low after the output
has been enabled. If strobing is started within 150μs (typ)
after ENC has been set low, the counter will continue to
count down. After 150μs (typ) the counter is reset.
The full-scale output current is calculated as follows:
MLED full-scale output current
= ( 1.215V/(RM + 500) ) ? 515
CLED full-scale output current
= ( 1.215V/(RC + 500) ) ? 7500
When both ENM and ENC are held low for 150μs (typ)
the part will go into shutdown. See Figure 1 for timing
information.
ENC resets the mode to 1x on a falling edge.
tPW ≥ 60ns
tEN 150μs (TYP)
tSD 150μs (TYP)
ENM
OR ENC
PROGRAMMED
CURRENT
LED
CURRENT
SHUTDOWN
Figure 1. Current Programming and Shutdown Timing Diagram
ENM = ENC = LOW
3210 F01
3210fb
发布紧急采购，3分钟左右您将得到回复。
相关PDF资料
LTC3212EDDB#TRPBF
IC LED DRIVER RGB 12-DFN
LTC3214EDD#TRPBF
IC LED DRIVR WHITE BCKLGT 10-DFN
LTC3215EDD#PBF
IC LED DRIVR WHITE BCKLGT 10-DFN
LTC3217EUD#TRPBF
IC LED DRVR FLASH TORCH 16QFN
LTC3218EDDB#TRPBF
IC LED DRVR FLASH TORCH 10DFN
LTC3219EUD#PBF
IC LED DRIVR QVGA DISPLAY 20-QFN
LTC3220EPF#PBF
IC LED DRVR QVGA DISPLAY 28UTQFN
LTC3230EUD#PBF
IC LED DRIVR WHITE BCKLGT 20-QFN
相关代理商/技术参数
LTC3210EUD-1#PBF
功能描述:IC LED DRIVR WHITE BCKLGT 16-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
LTC3210EUD-1#TRPBF
功能描述:IC LED DRIVR WHITE BCKLGT 16-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
LTC3210EUD-1-PBF
制造商:LINER 制造商全称:Linear Technology 功能描述:MAIN/CAM LED Controller with 64-Step Brightness Control in 3mm × 3mm QFN
LTC3210EUD-1-TRPBF
制造商:LINER 制造商全称:Linear Technology 功能描述:MAIN/CAM LED Controller with 64-Step Brightness Control in 3mm × 3mm QFN
LTC3210EUD-2#PBF
功能描述:IC LED DRIVR WHITE BCKLGT 16-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
LTC3210EUD-2#TRPBF
功能描述:IC LED DRIVR WHITE BCKLGT 16-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
LTC3210EUD-2-PBF
制造商:LINER 制造商全称:Linear Technology 功能描述:MAIN/CAM LED Controllers with 32-Step Brightness Control in 3mm × 3mm QFN
LTC3210EUD-2-TRPBF
制造商:LINER 制造商全称:Linear Technology 功能描述:MAIN/CAM LED Controllers with 32-Step Brightness Control in 3mm × 3mm QFN