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| 型号： | MAX1582ETC+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 1/10页 |
| 文件大小： | 0K |
| 描述： | IC LED DRVR WHITE BCKLGT 12-TQFN |
| 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： | 2 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | 白色 LED |
| 频率： | 800kHz ~ 1.25MHz |
| 电源电压： | 2.6 V ~ 5.5 V |
| 输出电压： | 25.5V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-WQFN 裸露焊盘 |
| 供应商设备封装： | 12-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
19-2783; Rev 2; 8/05
ATION
AILABL
EVALU E
AV
KIT
High-Efficiency Step-Up Converters
for White LED Main and Subdisplay Backlighting
General Description
The MAX1582/MAX1582Y drive up to six white LEDs in
series with a constant current to provide display back-
lighting for two (main and sub-) displays in cell phones
and other handheld devices. This configuration elimi-
nates the need for ballast resistors and expensive fac-
tory calibration. The proprietary dual-output, step-up
pulse-width modulation (PWM) converter includes a low
R DSON n-channel MOSFET switch for high efficiency and
maximum battery life.
The MAX1582/MAX1582Y utilize 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 equipment. Integrated overvoltage protection (27V
for the MAX1582 and 18V for the MAX1582Y) 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
without 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.
Features
? Accurate Current Regulation for Uniform
Illumination
? Lights Up Two LED Sections for Main and
Subdisplays
? Up to 84% Efficiency
? Internal High-Power, 30V MOSFET
? Low 15mV P-P Input Ripple
? Flexible Dimming Control
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
Ordering Information
The MAX1582/MAX1582Y are available in tiny 4 ? 4
chip-scale (UCSP?) and 12-pin thin QFN packages.
Applications
Cell Phones with One or Two Displays
Smart Phones, Palmtops, and Wireless
Handhelds
PART
MAX1582 EBE-T
MAX1582EBE+T
MAX1582ETC
MAX1582ETC+
TEMP RANGE PIN-PACKAGE
-40 ° C to +85 ° C 16 UCSP-16
-40 ° C to +85 ° C 16 UCSP-16
-40 ° C to +85 ° C 12 Thin QFN-EP*
-40 ° C to +85 ° C 12 Thin QFN-EP*
TOP
MARK
1582EBE
1582EBE
AACE
AACE
Other Handheld Devices with Dual Displays
Typical Application Circuit
* EP = Exposed paddle.
+ Denotes lead-free package.
UCSP is a trademark of Maxim Integrated Products, Inc.
Ordering Information continued at end of data sheet.
INPUT
2.6V TO 5.5V
22 μ H
TOP VIEW
Pin Configurations
2.2 μ F
V+
LX
12
11
10
+
ANALOG OR
DIRECT PWM
DIMMING
VP
CTRL
MAX1582
OUT1
PGND
0.1 μ F
2 TO 4 LEDS
MAIN
DISPLAY
V+
VP
CTRL
1
2
3
MAX1582
MAX1582Y
9
8
7
OUT2
CS
EN2
EN1
OUT2
4
5
6
EN2
COMP
CS
2 TO 3 LEDS
SUB-
DISPLAY
4mm x 4mm
0.022 μ F
GND
7.5 Ω
THIN QFN
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
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.
1
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