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参数资料
| 型号： | LTC3206EUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WT/RGB BCKLGT 24-QFN |
| 标准包装： | 2,500 |
| 拓扑： | PWM，切换式电容器（充电泵） |
| 输出数： | 11 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 680kHz ~ 1.36MHz |
| 电源电压： | 2.7 V ~ 4.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
LTC3206
APPLICATIO S I FOR ATIO
(
I LED = 400 0.6V – CNTRL
11
Once an LED pin drops out, the LTC3206 switches into
step-up mode. Employing the fractional ratio 1.5x charge
pump, the LTC3206 provides more efficiency than would
be achieved with a voltage doubling charge pump.
LTC3206
I MS
I RGB
12
R1
R2
V
R1 || R2 R2
)
V CNTRL
In 1.5x boost mode, the efficiency is similar to that of a
linear regulator with an effective input voltage of 1.5 times
the actual input voltage. This is because the input current
for a 1.5x fractional charge pump is approximately 1.5
times the load current. In an ideal 1.5x charge pump, the
power efficiency would be given by:
12k
3206 F08
Figure 8. Alternative Linear Brightness Control
connecting V CNTRL to a digital signal. This topology can be
η IDEAL ≡
P LED
P IN
=
V LED ? I LED
V IN ? 1 . 5 I LED
?
V LED
1 . 5 V IN
extended to any number of bits and can also be applied to
the RGB display.
Finally, PWM brightness control can be achieved by apply-
Thermal Management
For higher input voltages and maximum output current,
there can be substantial power dissipation in the LTC3206.
If the junction temperature increases above approximately
160 ° C the thermal shutdown circuitry will automatically
LTC3206
I MS
I RGB
11
12
34k
18.2k
V DIG
0V TO 0.7V
OR HIGHER
deactivate the output. To reduce the maximum junction
temperature, a good thermal connection to the PC board
is recommended. Connecting the PGND pin (exposed
center pad) to a ground plane and maintaining a solid
ground plane under the device can reduce the thermal
resistance of the package and PC board considerably.
Brightness Control
Although the LTC3206 has many exponentially spaced
brightness settings for the main and sub displays, it is
possible to control the brightness by alternative means.
12k
3206 F09
Figure 9. Alternative Digital Brightness Control
ing a PWM signal to the I MS programming resistor as
shown in Figure 10. The signal should range from 0V (full
on) to any voltage above 0.7V (full off).
Figure 8 shows an example of how an external voltage
source can be use to inject a current into the I MS or I RGB
pins to control brightness. For example, if R1 and R2 are
24k, then the LED current would range from 20mA to 0mA
LTC3206
I MS
I RGB
11
12
12k
12k
PWM SIGNAL
0V TO 0.7V OR HIGHER
BRIGHTNESS = 1 – D
3206 F10
as V CNTRL is swept from 0V to 1.2V.
Figure 10. PWM Brightness Control of the MAIN and SUB Displays
Alternatively, if only digital outputs are available, the
number of settings can be doubled from 15 to 30 by simply
3206f
14
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| LTC3207 | 制造商:LINER 制造商全称:Linear Technology 功能描述:600mA Universal Multi-Output LED/CAM Driver |
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| LTC3207EUF#PBF | 功能描述:IC LED DRIVR QVGA DISPLAY 24-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 |
| LTC3207EUF#TRPBF | 功能描述:IC LED DRIVR QVGA DISPLAY 24-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 |
| LTC3207EUF-1#PBF | 功能描述:IC LED DRIVR QVGA DISPLAY 24-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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