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ATION
EVALU
AVAILA
19-3117; Rev 0; 12/03
KIT
B LE
180mA, 1x/2x, White LED Charge Pump
in 3mm x 3mm TDFN
General Description
The MAX1574 charge pump drives up to three white
LEDs with regulated constant current for uniform intensity.
By utilizing adaptive 1x/2x charge-pump modes and
very-low-dropout current regulators, it achieves 180mA
output drive capability and high efficiency over the 1-cell
lithium-battery input voltage range. Fixed-frequency
(1MHz) switching allows for tiny external components,
and the regulation scheme is optimized to ensure low EMI
and low input ripple.
The MAX1574 uses an external resistor to set the full-
scale 100% LED current. An enable input (EN) is used for
simple on/off control or can be pulsed repeatedly to set
lower LED current in multiple steps down to 5%. Once the
desired brightness is set, the MAX1574 maintains con-
stant LED current as long as EN is kept high. If EN is kept
low for more than 2ms, the MAX1574 enters shutdown.
The MAX1574 is available in a 10-pin 3mm x 3mm TDFN
package (0.8mm max height).
Applications
Features
? Up to 180mA (60mA/LED) Drive Capability
? 83% Average Efficiency (P LED / P BATT ) Over Li+
Battery Discharge
? 0.5% (typ) LED Current Matching
? Adaptive 1x/2x Mode Switchover
? Low Input Ripple and EMI
? 5% to 100% Dimming Through Single-Wire Serial
Pulse Interface
? Low 0.1μA Shutdown Current
? 2.7V to 5.5V Supply Voltage Range
? Soft-Start Limits Inrush Current
? Output Overvoltage Protection
? Thermal-Shutdown Protection
? 10-Pin 3mm x 3mm TDFN Package
Ordering Information
LCD Backlighting
Camera Strobes/Flashes and Movie Lights
Cell Phones/Smart Phones
PDAs, Digital Cameras, and Camcorders
PART
MAX1574ETB
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
10 TDFN
3mm x 3mm
TOP
MARK
ABB
Typical Operating Circuit
0.22 μ F
TOP VIEW
Pin Configuration
2.7V TO 5.5V
CP
CN
UP TO 180mA
10
9
8
7
6
1 μ F
IN
GND
MAX1574
OUT
1 μ F
LED1
MAX1574
ON/OFF AND
DIMMING
EN
LED2
SET
LED3
1
2
3
4
5
TDFN
3mm × 3mm
________________________________________________________________ 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.
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相关代理商/技术参数
MAX1574ETB-T
功能描述:LED照明驱动器 White LED 1x/2x Charge Pump 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
MAX1574EVKIT
功能描述:LED 照明开发工具 Evaluation Kit for the MAX1574 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:
MAX1575ETE
功能描述:LED照明驱动器 White LED 1x/1.5x Charge Pump 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
MAX1575ETE/V+
功能描述:LED照明驱动器 White LED 1x/1.5x Charge Pump for Main and Sub-Displays 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
MAX1575ETE/V+T
功能描述:LED照明驱动器 White LED 1x/1.5x Charge Pump for Main and Sub-Displays 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
MAX1575ETE+
功能描述:LED照明驱动器 White LED 1x/1.5x Charge Pump 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
MAX1575ETE+T
功能描述:LED照明驱动器 White LED 1x/1.5x Charge Pump 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
MAX1575ETE-T
功能描述:LED照明驱动器 White LED 1x/1.5x Charge Pump 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
