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参数资料
| 型号： | MAX1916EZT+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 6/7页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHITE BCKLGT 6TSOT |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 恒定电流： | 是 |
| 拓扑： | 线性（LDO） |
| 输出数： | 3 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 电源电压： | 2.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 细型，TSOT-23-6 |
| 供应商设备封装： | TSOT-23-6 |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | MAX1916EZT+TDKR |
Low-Dropout, Constant-Current
Triple White LED Bias Supply
V+
TO OTHER
Setting the Output Current
SET controls the LED bias current. Current flowing into
LED1, LED2, and LED3 is 230 times greater than the
EXISTING V CTRL
LDO
CIRCUITS
current flowing into SET. Set the output current as fol-
lows:
ON
SET
LED1 LED2 LED3
I LED _ = 230
(V CTRL ? V SET )
R SET
OFF
EN
MAX1916
GND
where V SET = 1.215V, V CTRL is an external voltage
between 1.8V and 5.5V, and R SET is the resistor con-
nected between V CTRL and SET ( Figure 1).
Applications Information
Figure 2. Very Low-Cost, High-Efficiency Solution
1) Very Low-Cost, High-Efficiency Solution (Figure 2).
A battery (single Li+ or three NiMH cells) powers
the LEDs directly. This is the least expensive and
most efficient architecture. Due to the high forward
DAC
V CTRL
V+
voltage of white LEDs (3.3V), the LED brightness
may dim slightly at the end of battery life. The
MAX1916 ’ s current-regulating architecture and low
dropout greatly minimize this effect compared to
using simple ballast resistors. The enable function
SET
LED1 LED2
LED3
of the MAX1916 turns on and off the LEDs. An exist-
ON
OFF
EN
MAX1916
ing low-dropout regulator is used as V CTRL .
2) Brightness Adjustment Using a DAC (Figure 3). A
GND
Figure 3. Brightness Adjust Using DAC
V BATT
DAC is used as V CTRL such that the LED brightness
may be dynamically adjusted to eliminate factory
calibration. A battery (single Li+ or three NiMH
cells) or a regulated power source drives the LEDs.
3) Existing 5V Supply (Figure 4). Use an existing sys-
tem regulator, such as the MAX684, to provide the
required LED voltage and provide power to other
circuits. Due to the high forward voltage of white
LEDs (3.3V), use a 3.6V to 5.5V regulated supply to
EXISTING
REGULATOR
5.0V
V+
TO OTHER
CIRCUITS
provide enough voltage headroom such that the
LEDs will maintain constant brightness for any bat-
tery voltage. Use the existing regulated supply as
V CTRL .
ON
OFF
SET
EN
LED1 LED2
MAX1916
LED3
TRANSISTOR COUNT: 220
Chip Information
Figure 4. Existing 5V Supply Circuit
GND
PROCESS: BiCMOS
6
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1917EEE | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1917EEE+ | 功能描述:直流/直流开关转换器 Track/Sink/Source Synchronous Buck RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1917EEE+T | 功能描述:直流/直流开关转换器 Track/Sink/Source Synchronous Buck RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1917EEE-T | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1917EEE-TG068 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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