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19-2526; Rev 1; 4/05
White LED Current Regulator with 1x/1.5x
High-Efficiency Charge Pump
General Description
The MAX1570 fractional charge pump drives up to five
white LEDs with regulated constant current for uniform
intensity. The MAX1570 maintains the highest possible
efficiency over the full 1-cell lithium-ion (Li+) battery
input voltage range by utilizing a 1x/1.5x fractional
charge pump and very-low-dropout current regulators.
The MAX1570 operates with 1MHz fixed-frequency
switching, allowing for tiny external components. The
regulation scheme is optimized to ensure low EMI and
low input ripple.
An external resistor sets the full-scale LED current,
while two digital inputs control on/off and select
between three levels of brightness. A pulse-width mod-
ulation (PWM) signal can also be used to modulate LED
brightness.
The MAX1570 is available in 16-pin 4mm ? 4mm Thin
QFN packaging (0.8mm max height).
Applications
White LED Backlighting
Cell Phones and Smart Phones
PDA and Palmtop Computers
Features
? Excellent 0.3% LED-to-LED Current Matching
? 30mA/LED Drive Capability
? Proprietary 1x/1.5x Modes for Ultra-High
Efficiency
? Low Input Ripple and EMI
? Eliminates Ballast Resistors
? Digital or PWM LED Dimming Control
? 0.1μA Shutdown Current
? 2.7V to 5.5V Supply Voltage Range
? Soft-Start Limits Inrush Current
? Thermal-Shutdown Protection
? No External Inductor, Schottky, or Zener Diode
Required
? Tiny 16-Pin 4mm ? 4mm Thin QFN Package
Ordering Information
Portable MP3 Players
Digital Cameras and Camcorders
PART
MAX1570ETE
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
16 Thin QFN
Pin Configuration
Typical Operating Circuit
TOP VIEW
1 μ F
1 μ F
12
11
10
9
C1P
C1N C2P
C2N
2.7V TO 5.5V
IN
1x/1.5x
OUT
IN 13
C2P 14
8
7
LED1
LED2
1 μ F
REGULATING CHARGE PUMP
MAX1570
4.7 μ F
OUT 15
C2N 16
MAX1570
6
5
LED3
LED4
ON/OFF
AND
DIMMING
EN1
EN2
SET
REFERENCE
AND
CONTROL
LOW-DROPOUT
CURRENT
REGULATORS
LED1
LED2
LED3
LED4
LED5
1
2
3
4
RSET
THIN QFN
4mm x 4mm
GND
PGND
________________________________________________________________ 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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相关代理商/技术参数
MAX1570ETE+T 功能描述:LED照明驱动器 White LED Crnt Reg w/1-1.5x 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
MAX1570ETE-T 功能描述:LED照明驱动器 White LED Crnt Reg w/1-1.5x 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
MAX1570ETE-TG075 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1570EVKIT 功能描述:LED 照明开发工具 Evaluation Kit for the MAX1570 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:
MAX1571ETM 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1572ETC075 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1572ETC075+ 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1572ETC130 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT