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19-2847; Rev 2; 8/05
White LED 1x/1.5x Charge Pump in
UCSP and Thin QFN
General Description
The MAX1573 fractional charge pump drives up to four
white LEDs with regulated constant current for uniform
intensity. By utilizing proprietary adaptive 1x/1.5x
modes and ultra-low-dropout current regulators, it
maintains the highest possible efficiency over the full
1-cell Li+ battery input voltage range. The 1MHz fixed-
frequency switching allows for tiny external compo-
nents and 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 amongst three
levels of brightness. A pulse-width modulation (PWM)
signal can also be used to modulate LED brightness,
requiring no additional components.
The MAX1573 is available in the tiny chip-scale UCSP?
(4 x 4 grid) and 16-pin thin QFN packages.
Applications
Cell Phones, Smart Phones
Features
? Proprietary Adaptive 1x/1.5x Modes
? High Efficiency (P LEDs /P BATT ), Up to 92%
? 0.2% LED Current Matching
? 28mA/LED Drive Capability
? Low Input Ripple and EMI
? Eliminates Ballast Resistors
? Logic or PWM Dimming Control
? Low 0.1μA Shutdown Current
? 2.7V to 5.5V Input Voltage Range
? Soft-Start Limits Inrush Current
? Output Overvoltage Protection
? Thermal Shutdown Protection
? No External Schottky Diode Required
? Tiny UCSP (2.1mm x 2.1mm x 0.6mm) and Thin
QFN (4mm x 4mm) Packages
Ordering Information
PDAs, Digital Cameras, Camcorders
MP3 Players
Other Handhelds with Color Displays
PART
MAX1573EBE-T
MAX1573ETE
MAX1573ETE+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
14 UCSP (4 x 4)
16 Thin QFN
16 Thin QFN
+ Denotes lead-free package.
Typical Operating Circuit
Pin Configurations
1 μ F
1 μ F
TOP VIEW
12
11
10
9
V IN
2.7V TO 5.5V
C1N
IN
C1P C2N
C2P
OUT
V OUT
UP TO 4 LEDS
CIN
13
8
LED1
1 μ F
1 μ F
IN
14
7
LED2
ON/OFF
AND
DIMMING
CONTROL
EN1
EN2
MAX1573
LED1
LED2
C2N
C1P
15
16
MAX1573
6
5
SET
EN2
LED3
SET
LED4
1
2
3
4
GND
R SET
THIN QFN
4mm × 4mm
A "+" SIGN WILL REPLACE THE FIRST PIN INDICATOR ON LEAD-FREE PACKAGES.
Pin Configurations continued at end of data sheet.
UCSP is a trademark of Maxim Integrated Products, Inc.
________________________________________________________________ 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
MAX1573ETE+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
MAX1573ETE-G104 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1573ETE-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
MAX1573ETE-TG104 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1573EVKIT 制造商:Maxim Integrated Products 功能描述:SMALLEST HIGHEST EFFICIENCY WHITE - Rail/Tube
MAX1573TQFNEVKIT 制造商:Maxim Integrated Products 功能描述:SMALLEST HIGHEST EFFICIENCY WHITE - Rail/Tube
MAX1574EEE 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
MAX1574ETB 制造商:Maxim Integrated Products 功能描述:180MA, 1X/2X, WHITE LED CHARGE PUMP IN 3MM X - Rail/Tube