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High-Efficiency, 40V Step-Up
Converters for 2 to 10 White LEDs
Typical Operating Characteristics
(MAX1553 driving six white LEDs, V CC = V EN = 3.6V, Circuit of Figure 1, T A = +25°C, unless otherwise noted.)
100
EFFICIENCY vs. LOAD CURRENT
DRIVING 6 WHITE LEDS
100
EFFICIENCY vs. LOAD CURRENT
DRIVING 6 WHITE LEDS
100
EFFICIENCY vs. LOAD CURRENT
DRIVING 6 WHITE LEDS
90
80
V CC = 4V
V CC = 5V
90
80
V CC = 4V
V CC = 5V
90
80
V CC = 4V
V CC = 5V
70
V CC = 3.6V
V CC = 3V
70
V CC = 3.6V
V CC = 3V
70
V CC = 3.6V
V CC = 3V
60
50
L1 = 22 μ H
NO CAPACITOR ACROSS LEDs
60
50
L1 = 33 μ H
4700pF ACROSS LEDs
60
50
L1 = 47 μ H
4700pF ACROSS LEDs
0
5
10
15
20
0
5
10
15
20
0
5
10
15
20
100
LOAD CURRENT (mA)
EFFICIENCY vs. LOAD CURRENT
WITH MAX1554 DRIVING 9 WHITE LEDS
26
LOAD CURRENT (mA)
LED CURRENT
vs. INPUT VOLTAGE
26
LOAD CURRENT (mA)
LED CURRENT
vs. INPUT VOLTAGE
90
V CC = 4V
V CC = 5V
23
L1 = 22 μ H, NO CAPACITOR ACROSS LEDs
23
L1 = 22 μ H, NO CAPACITOR ACROSS LEDs
80
20
20
70
60
V CC = 3.6V
17
14
L1 = 47 μ H,
4700pF ACROSS LEDs
L1 = 33 μ H, 4700pF ACROSS LEDs
17
14
L1 = 47 μ H,
4700pF ACROSS LEDs
L1 = 33 μ H, 4700pF ACROSS LEDs
50
CIRCUIT OF FIGURE 3
11
R1 = 10 ? , V BRT = 1.25V
11
R1 = 14 ? , V BRT = 3.3V
0
5
10
15
20
2.5
3.0
3.5
4.0
4.5
5.0
5.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
26
23
20
17
LOAD CURRENT (mA)
LED CURRENT vs. INPUT VOLTAGE
WITH MAX1554 DRIVING 9 LEDS
35
30
25
20
15
INPUT VOLTAGE (V)
LED CURRENT
vs. BRT VOLTAGE
30
25
20
15
INPUT VOLTAGE (V)
LED CURRENT
vs. BRT DUTY CYCLE
10
10
14
11
CIRCUIT OF FIGURE 3
5
0
5
0
3.0
3.5
4.0
4.5
5.0
5.5
0
0.6
1.2
1.8
2.4
3.0
3.6
0
20
40
60
80
100
INPUT VOLTAGE (V)
BRT VOLTAGE (V)
BRT DUTY CYCLE (%)
4
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相关代理商/技术参数
MAX1554ETA+TG069 制造商:Maxim Integrated Products 功能描述:LED DRVR 10SEGMENT 3.15V TO 5.5V 8TDFN EP - Tape and Reel
MAX1554ETA-T 功能描述:LED照明驱动器 40V StepUp Converter for 2-10 White LEDs 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
MAX1555EZK 制造商:Maxim Integrated Products 功能描述:SOT-23 DUAL-INPUT USB/AC ADAPTER 1- - Cut Tape Product
MAX1555EZK+ 制造商:Maxim Integrated Products 功能描述:CHRGR LI-ION/LI-POL 280MA 4.2V 5PIN TSOT-23 - Rail/Tube
MAX1555EZK+T 功能描述:电池管理 Dual USB/AC 1-Cell Li+ Battery Charger RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel
MAX1555EZK+T 制造商:Maxim Integrated Products 功能描述:CHARGER BATT LI+ USB/AC 5SOT23 制造商:Maxim Integrated Products 功能描述:CHARGER, BATT, LI+, USB/AC, 5SOT23 制造商:Maxim Integrated Products 功能描述:CHARGER, BATT, LI+, USB/AC, 5SOT23; Battery Type:Li-Ion, Li-Polymer; Input Voltage:7V; Battery Charge Voltage:4.2V; Charge Current Max:280mA; Battery IC Case Style:SOT-23; No. of Pins:5; No. of Series Cells:1; Operating Temperature ;RoHS Compliant: Yes
MAX1555EZK-T 功能描述:电池管理 RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel
MAX15561GTL+ 功能描述:模数转换器 - ADC New 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