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参数资料
| 型号： | MAX1985ETP |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 显示驱动器 |
| 英文描述： | Ultra-High-Efficiency White LED Drivers |
| 中文描述： | LED DISPLAY DRIVER, QCC20 |
| 封装： | 4 X 4 MM, 0.80 MM HEIGHT, MO-220WGGD-1, QFN-20 |
| 文件页数： | 1/17页 |
| 文件大小： | 333K |
| 代理商： | MAX1985ETP |
General Description
The MAX1984/MAX1985/MAX1986 are white light-emit-
ting diode (LED) drivers that use individual regulators to
control the current of up to eight LEDs. A high-efficiency
step-up regulator generates just enough voltage to keep
all the current regulators in regulation. A versatile dim-
ming interface accommodates analog, digitally adjusted
pulse-width modulation (DPWM), or parallel control.
The individual current regulators allow good current
matching between LEDs. Open or shorted LEDs cannot
affect the performance of other LEDs.
The step-up regulator achieves high efficiency by using
synchronous rectification. The internal N-channel switch
and P-channel synchronous rectifier eliminate the need
for external MOSFETs and diodes. The 1MHz switching
frequency allows the use of low-profile inductors and
ceramic capacitors.
The brightness can be easily adjusted using a multi-
mode dimming interface, which allows brightness control
through a DPWM signal, a 2- or 3-bit parallel control
interface, or an analog signal. The DPWM signal can be
connected directly to the control pin without the need for
an external RC filter if its frequency is 10kHz or above.
The MAX1984 drives up to eight LEDs, the MAX1985
drives up to six LEDs, and the MAX1986 drives up to
four LEDs. Each device has an LED select pin (SEL)
that allows one subset, the other subset, or all LEDs to
be illuminated. All three devices are available in a
4mm
4mm thin QFN package.
Applications
PDAs and Hand-Held PCs
Cellular Phones
Digital Cameras
Features
o
Synchronous Step-Up Regulator
Achieves >95% Efficiency
Internal Switch and Synchronous Rectifier
Eliminates External MOSFETs and Diodes
1MHz Fixed Frequency Minimizes Component
Sizes
o
Up to 90% Total LED Efficiency
o
Accurate LED Current Matching (8% max)
o
Adjustable Maximum LED Current
o
Multimode Dimming Control
Digital Pulse-Width Modulation Control
2-Bit Parallel Control
3-Bit Parallel Control
Analog Control
o
Selectively Enable LEDs
o
Open-LED Detection
o
Unique 0.5mA LED Test Mode
o
2.7V to 5.5V Input Supply Range
o
Small 4mm x 4mm 20-Pin Thin QFN Package
M
Ultra-High-Efficiency White
LED Drivers
________________________________________________________________
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
Ordering Information
19-2761; Rev 0; 1/03
EVALUATION KIT
AVAILABLE
PART
TEMP RANGE
PIN-PACKAGE
NO. OF
LEDs
MAX1984
ETP
MAX1985
ETP
MAX1986
ETE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
20 Thin QFN
20 Thin QFN
16 Thin QFN
8
6
4
20
19
18
17
16
6
7
8
9
10
L
M
I
B
15
14
13
12
11
B
L
L
L
BITB
REF
SETI
LD8
1
2
3
4
5
LD7
OUT
LX
GND
LD1
LD2
TOP VIEW
4mm x 4mm
THIN QFN
L
S
MAX1984
20
19
18
17
16
6
7
8
9
10
L
M
I
B
15
14
13
12
11
B
L
L
L
BITB
REF
SETI
N.C.
1
2
3
4
5
LD6
OUT
LX
GND
N.C.
LD1
4mm x 4mm
THIN QFN
L
S
MAX1985
16
15
14
13
5
6
7
8
M
I
B
12
11
10
9
L
L
L
BITA
BITB
REF
SETI
1
2
3
4
OUT
LX
GND
LD1
4mm x 4mm
THIN QFN
L
S
MAX1986
Pin Configurations
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1986ETE | Ultra-High-Efficiency White LED Drivers |
| MAX1994ETM | Dual Step-Down Controllers Plus Linear- Regulator Controller for Notebook Computers |
| MAX1816 | Replaced by TMS320VC5506 : Digital Signal Processors 144-LQFP |
| MAX1816ETM | Replaced by TMS320VC5506 : Digital Signal Processors 144-LQFP |
| MAX199AEWI | Fixed-Point Digital Signal Processor 532-FCBGA |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1985ETP+ | 功能描述:LED照明驱动器 High-Efficiency White LED Driver 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 |
| MAX1985ETP+T | 功能描述:LED照明驱动器 High-Efficiency White LED Driver 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 |
| MAX1985ETP-T | 功能描述:LED照明驱动器 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 |
| MAX1985EVKIT | 功能描述:电源管理IC开发工具 MAX1985 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX1986ETE | 功能描述:LED照明驱动器 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 |
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