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参数资料
| 型号： | MAX1848ETA+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 7/9页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVR WHITE BCKLGT 8-TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 恒定电流： | 是 |
| 拓扑： | PWM，升压（升压） |
| 输出数： | 1 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 1MHz ~ 1.5MHz |
| 电源电压： | 2.6 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
White LED Step-Up Converter in SOT23
The output current and the number of LEDs in each leg
affect the capacitance of C COMP . Table 1 shows the
minimum C COMP values needed to stabilize the con-
verter in worst-case conditions. If further stability analy-
sis is required, note that the error amplifier has 50μA/V
transconductance.
Inductor Selection
The value of the inductor depends on the maximum
output current to the LEDs. See Table 1 for inductance
values and peak current ratings for the inductor.
Schottky Diode Selection
The MAX1848’s high-switching frequency demands a
high-speed rectification diode. A Schottky diode is
required due to their fast recovery time and low for-
ward-voltage drop. Ensure that the diode’s average
and peak current rating exceed the average output cur-
rent and peak inductor current, respectively. In addi-
tion, the diode ’s reverse breakdown voltage must
exceed V OUT .
PC Board Layout
Due to fast-switching waveforms and high-current
paths, careful PC board layout is required. Protoboards
and wire-wrap boards should not be used for evalua-
tion. An evaluation kit (MAX1848EV kit) is available to
aid design.
When laying out a board, minimize trace lengths
between the IC and R SENSE , the inductor, the diode,
the input capacitor, and the output capacitor. Keep
traces short, direct, and wide. Keep noisy traces, such
as the inductor's traces, away from CS. V+’s bypass
capacitor (C IN ) should be placed as close to the IC as
possible. PGND and GND should be connected in only
one place as close to the IC as possible. The ground
connections of C IN and C OUT should be as close
together as possible. The traces from V+ to the induc-
tor and from the Schottky diode to the LEDs may
be longer.
Refer to the MAX1848 EV kit for an example of proper
layout.
I DIODE(RMS) ?
I OUT × I PEAK
Applications Information
2.6V to 5.5V
10 μ H
Connecting Four or Six LEDs
The MAX1848 can drive one, two, or three legs of LEDs
3.3 μ F
LX
D1
(Figure 2) as long as the total number of LEDs does not
exceed six. Each leg must contain the same number of
LEDs and the same sense-resistor value. Adding the
V+
MAX1848
OUT
1 μ F
second or third leg does not affect the sense-resistor
value (see the Adjusting LED Current section).
Three legs of two LEDs is more efficient than two legs
of three LEDs (see Efficiency Graphs in the Typical
Operating Characteristics ); however, a third sense
resistor is needed. Multiple legs can have slight current
LOGIC
OR DAC
0.01 μ F
CTRL
COMP
PGND
GND
CS
R SENSE
5 Ω
25 Ω
30 Ω
mismatches due to component tolerances.
Figure 2. Six LEDs in 3 x 2 Configuration
Table 1. Component Selection
I LED
(mA)
12
20
40
60
NO. OF
LEDs
3
2
3
2
3
2
3
2
C COMP
(μF)
0.220
0.100
0.150
0.068
0.100
0.047
0.068
0.01
INDUCTOR
L (μH) I PEAK (mA)
56
80
33
130
15
260
10
375
TRANSISTOR COUNT: 1290
Chip Information
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1848EVKIT | 功能描述:LED 照明开发工具 Evaluation Kit for the MAX1848 RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装: |
| MAX184ACNG | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX184ACNG+ | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX184ACWG | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
| MAX184ACWG+ | 功能描述:模数转换器 - ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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