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参数资料
| 型号： | MAX8822ETE+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 16-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 恒定电流： | 是 |
| 拓扑： | 线性（LDO），PWM，切换式电容器（充电泵） |
| 输出数： | 4 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz |
| 电源电压： | 2.7 V ~ 5.5 V |
| 输出电压： | 5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN（3x3） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 85°C |
Ultra-Efficient Negative Charge-Pump LED
Driver with Dual LDOs in 3mm x 3mm Thin QFN
Table 1. ENLED Pulse Count and Programmed LED_ Current
ENLED PULSE
COUNT*
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
PROGRAMMED LED_ CURRENT
(mA)
24.0
22.4
20.8
19.2
17.6
16.0
14.4
12.8
11.2
9.6
8.0
6.4
5.6
4.8
4.0
3.2
ENLED PULSE COUNT*
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31**
—
PROGRAMMED LED_ CURRENT
(mA)
2.8
2.4
2.0
1.6
1.4
1.2
1.0
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
—
*Rising edge.
**If ENLED is pulsed more than 31 times, the pulse count restarts at 1 on the 32 nd rising edge.
Low LED Current Levels
The MAX8822 internally generates a PWM signal to
obtain higher resolution at lower currents. As LED cur-
Table 2. Internal PWM Duty Cycle vs. LED
Set Current
rent is set below 6.4mA, the IC adjusts not only LED DC
current, but the duty cycle is controlled by the PWM
signal. The frequency of the PWM dimming signal is set
at 1kHz with a minimum duty cycle of 1/16 to avoid the
LED flickering effect to human eyes. Table 2 shows the
current level and the corresponding duty cycle.
LDO1/LDO2 Output Voltage Control
Similar to the LED dimming control structure, the
MAX8822 uses serial-pulse control to program the out-
put voltages of LDO1 and LDO2 to one of sixteen differ-
ent combinations. To program the LDO voltages, pulse
ENLDO low (500ns to 500μs pulse width), as shown in
Figure 2. An internal register accumulates the pulse
count on the rising edge of the ENLDO pulse. An initial
DUTY CYCLE
(n/16th)
16
14
12
10
16
14
12
10
16
14
I LED (mA)
6.4
5.6
4.8
4.0
3.2
2.8
2.4
2.0
1.6
1.4
DUTY CYCLE
(n/16th)
12
10
8
7
6
5
4
3
2
1
I LED (mA)
1.2
1.0
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
pulse (t INIT ) is required to enable the LDOs from shut-
down. See Table 3 for LDO voltage combinations and
the corresponding ENLDO pulse count. When the
desired pulse count is met, hold ENLDO high for at
least 2.5ms (t HOLD ) to internally latch the pulse-count
value and program the LDO output voltages at the
desired level. If ENLDO is pulsed for more than 15
counts, LDO1 and LDO2 are off when the count is
latched (the count does not roll over). To program new
LDO_ output voltages, follow the previous sequence
from the beginning. Do not include the initial t INIT pulse
when programming LDO voltages unless enabling the
LDOs from shutdown (the OFF setting is not shutdown).
Pulling ENLDO low for greater than 2.5ms places the
LDOs in shutdown.
______________________________________________________________________________________
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8822ETE+ | 功能描述:LED照明驱动器 Negative Charge Pump LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX8822ETE+T | 功能描述:LED照明驱动器 Negative Charge Pump LED Driver RoHS:否 制造商:STMicroelectronics 输入电压:11.5 V to 23 V 工作频率: 最大电源电流:1.7 mA 输出电流: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:SO-16N |
| MAX882C/D | 功能描述:低压差稳压器 - LDO RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX882C/D DIE | 制造商:Maxim Integrated Products 功能描述: |
| MAX882CPA | 功能描述:低压差稳压器 - LDO 5/3.3/AdjV 200mA Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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