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High-Efficiency Step-Up Converters
for White LED Main and Subdisplay Backlighting
2.6V TO 5.5V
C IN
2.2 μ F
L1
V+
VP
22 μ F
PWM
CONTROL
LX
PGND
D1
C OUT1
0.1 μ F
f OSC
1.0MHz
SLOPE COMP.
OVERVOLTAGE
OUT1
UP TO 27V
CURRENT SENSE
PROTECTION
DAC OR
CTRL
114k Ω
336k Ω
2 TO 4 LEDS
MAIN DISPLAY
PWM
1.25V CLAMP
50k Ω
g m
COMP
C COMP
0.022 μ F
EN1
ENABLE
INPUTS
EN2
OUT2
CS
UP TO 13V
2 TO 3 LEDS
SUBDISPLAY
MAX1582
Figure 1. Functional Diagram
GND
SHUTDOWN
R SENSE
7.5 Ω
Detailed Description
The MAX1582’s high efficiency and small size make it
ideally suited to drive up to six series-connected LEDs
(four LEDs for the MAX1582Y). Separate enable inputs
are provided to control the main and subdisplay back-
lighting. The MAX1582/MAX1582Y operate as a boost
DC-to-DC converter that regulates output current rather
than voltage. It provides even illumination by sourcing the
same output current through each LED, eliminating the
need for expensive factory calibration. The fast 1MHz
internal oscillator allows for a small inductor and small
input and output capacitors while minimizing input and
output ripple.
Shutdown for Main and Subdisplay
The MAX1582/MAX1582Y have two enable inputs (EN1
and EN2) used to enable or shutdown the main and
subdisplay LEDs. When EN1 and EN2 are both high, all
LEDs are lit. With EN1 high and EN2 low, the main-dis-
play LEDs are lit, and the subdisplay LEDs are shorted
by the MAX1582/MAX1582Y. With EN1 low and EN2
high, the main-display LEDs are shorted and the subdis-
play LEDs are lit.
When both EN1 and EN2 are low, the MAX1582/
MAX1582Y enter shutdown, reducing supply current to
0.01μA (typ). Although the internal n-channel MOSFET
does not switch in shutdown, there is still a DC-current
6
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相关代理商/技术参数
MAX1582ETC-T 功能描述:LED照明驱动器 Step-Up Converter for White LED Main 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
MAX1582EVKIT 功能描述:LED 照明开发工具 Evaluation Kit for the MAX1582 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:
MAX1582YEBE-T 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1582YETC 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1583EVKIT 功能描述:LED 照明开发工具 Evaluation Kit for the MAX1583 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:
MAX1583XETB 制造商:Maxim Integrated Products 功能描述:WHITE LED CAMERA-FLASH BOOST CONVER - Rail/Tube
MAX1583XETB+ 制造商:Maxim Integrated Products 功能描述:LED DRVR 5SEGMENT 2.6V TO 5.5V 10TDFN EP - Rail/Tube
MAX1583XETB+T 功能描述:LED照明驱动器 White LED Camera Flash Boost Convertr 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