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MAX1582

更新时间: 2024-09-14 22:57:59
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美信 - MAXIM 显示器转换器
页数 文件大小 规格书
10页 278K
描述
High-Efficiency, 26V Step-Up Converter for White LED Main and Subdisplay Backlighting

MAX1582 数据手册

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19-2783; Rev 0; 4/03  
High-Efficiency, 26V Step-Up Converter  
for White LED Main and Subdisplay Backlighting  
General Description  
Features  
Accurate Current Regulation for Uniform  
The MAX1582 drives up to six white LEDs in series with  
a constant current to provide display backlighting for  
two (main and sub-) displays in cell phones and other  
hand-held devices. This configuration eliminates the  
need for ballast resistors and expensive factory calibra-  
tion. The proprietary dual-output, step-up pulse-width  
Illumination  
Lights Up Two LED Sections for Main and  
Subdisplays  
Up to 84% Efficiency  
Internal High-Power, 30V MOSFET  
modulation (PWM) converter includes a 30V, low R  
DSON  
N-channel MOSFET switch for high efficiency and maxi-  
mum battery life.  
Low 15mV  
Input Ripple  
P-P  
Flexible Dimming Control  
The MAX1582 utilizes 1MHz current-mode PWM control  
to allow small input and output capacitors and a small  
inductor, while minimizing ripple on the input supply and  
avoiding interference to sensitive circuitry in the equip-  
ment. Integrated overvoltage protection eliminates the  
need for an external zener diode to protect the IC from  
open circuit. Flexible dimming control utilizes either an  
analog control signal or direct digital PWM control with-  
out external RC filtering. This also increases dimming  
accuracy at low brightness levels. The PWM dimming  
signal can be any frequency from 200Hz to 200kHz.  
Soft-start eliminates inrush current during startup.  
Analog DAC Controlled  
Direct-Digital PWM (No RC Required)  
from 200Hz to 200kHz  
Overvoltage Protection to Eliminate Zener Diode  
Constant 1MHz PWM Operation  
Low-Profile Inductor and Capacitors  
Soft-Start Eliminates Inrush Current  
2.6V to 5.5V Input  
0.01µA (typ) Shutdown Current  
Tiny UCSP (2.1mm 2.1mm 0.61mm) and Thin  
QFN (4mm 4mm) Packages  
The MAX1582 is available in tiny 4 4 chip-scale  
(UCSP™) and 12-pin thin QFN packages.  
Applications  
Ordering Information  
Cell Phones with One or Two Displays  
TOP  
MARK  
PART  
TEMP RANGE PIN-PACKAGE  
Smart Phones, Palmtops, and Wireless  
Handhelds  
MAX1582ETC -40°C to +85°C 12 Thin QFN-EP*  
MAX1582EBE-T -40°C to +85°C 16 UCSP-16  
*EP = Exposed paddle.  
AACE  
1582EBE  
Other Hand-Held Devices with Dual Displays  
Typical Application Circuit  
UCSP is a trademark of Maxim Integrated Products, Inc.  
Pin Configurations  
INPUT  
2.6V TO 5.5V  
22µH  
TOP VIEW  
2.2µF  
V+  
VP  
LX  
12 11 10  
MAX1582  
0.1µF  
OUT1  
ANALOG OR  
DIRECT PWM  
DIMMING  
MAIN  
DISPLAY  
2 TO 4 LEDS  
CTRL  
V+  
VP  
1
2
3
9
8
7
OUT2  
CS  
PGND  
OUT2  
MAX1582  
EN1  
CTRL  
EN2  
SUB-  
DISPLAY  
2 TO 3 LEDS  
EN2  
4
5
6
COMP  
CS  
0.022µF  
4mm x 4mm  
THIN QFN  
7.5Ω  
GND  
Pin Configurations continued at end of data sheet.  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at  
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.  

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