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MAX1576

更新时间： 2024-09-10 14:57:31
品牌 Logo 应用领域
亚德诺 - ADI 泵闪光灯
页数 文件大小 规格书
14页 300K
描述
480mA白光LED 1倍/1.5倍/2倍电荷泵，用于背光和相机闪光灯

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MAX1576 数据手册

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19-3326; Rev 1; 8/05  
480mA White LED 1x/1.5x/2x Charge Pump for  
Backlighting and Camera Flash  
General Description  
Features  
The MAX1576 charge pump drives up to 8 white LEDs  
with regulated constant current for uniform intensity.  
The main group of LEDs (LED1–LED4) can be driven  
up to 30mA per LED for backlighting. The flash group  
of LEDs (LED5–LED8) are independently controlled and  
can be driven up to 100mA per LED (or 400mA total).  
By utilizing adaptive 1x/1.5x/2x charge-pump modes  
and very-low-dropout current regulators, the MAX1576  
achieves high efficiency over the full 1-cell lithium-bat-  
tery voltage range. The 1MHz fixed-frequency switch-  
ing allows for tiny external components, and the  
regulation scheme is optimized to ensure low EMI and  
low input ripple.  
♦ Powers Up to 8 LEDs  
Up to 30mA/LED Drive for Backlight  
Up to 400mA Total Drive for Flash  
♦ 85% Average Efficiency (P  
/ P  
) Over Li+  
BATT  
LED  
Battery Discharge  
♦ 0.7% Typical LED Current Matching  
♦ Adaptive 1x/1.5x/2x Mode Switchover  
♦ Flexible Brightness Control  
Single-Wire, Serial Pulse Interface (5% to 100%)  
2-Bit (3 Levels) Logarithmic Logic  
♦ Low Input Ripple and EMI  
The MAX1576 uses two external resistors to set the  
main and flash full-scale (100%) LED currents. Four  
control pins are used for LED dimming by either serial  
control or 2-bit logic per group. ENM1 and ENM2 set  
the main LEDs to 10%, 30%, or 100% of full scale.  
ENF1 and ENF2 set the flash LEDs to 20%, 40%, or  
100% of full scale. In addition, connect either pair of  
control pins together for single-wire, serial pulse dim-  
ming control.  
♦ Low 0.1µA Shutdown Current  
♦ 2.7V to 5.5V Supply Voltage Range  
♦ Soft-Start Limits Inrush Current  
♦ Output Overvoltage Protection  
♦ Thermal-Shutdown Protection  
♦ 24-Pin Thin QFN, 4mm x 4mm Package  
The MAX1576 is available in a 24-pin thin QFN, 4mm x  
4mm package (0.8mm max height).  
Ordering Information  
PART  
TEMP RANGE  
PIN-PACKAGE  
Applications  
24 Thin QFN 4mm x  
4mm (T2444-4)  
Camera Phones  
MAX1576ETG  
-40°C to +85°C  
LCD Backlights  
24 Thin QFN 4mm x  
4mm (T2444-4)  
MAX1576ETG+  
-40°C to +85°C  
LED Camera Flashes  
Cell Phones and Smart Phones  
PDAs, Digital Cameras, and Camcorders  
+ Denotes lead-free package.  
Pin Configuration appears at end of data sheet.  
Typical Operating Circuit  
1μF  
1μF  
INPUT  
OUTPUT  
2.7V TO 5.5V  
UP TO 480mA  
C1P  
C1N  
C2P  
C2N  
INP  
IN  
OUT  
FLASH  
MAIN  
4.7μF  
4.7μF  
1μF  
GND1  
LED1  
LED2  
LED3  
LED4  
LED5  
MAX1576Y  
ENM1  
ENM2  
ON/OFF AND  
CURRENT  
SETTING  
ENF1  
ENF2  
LED6  
LED7  
LED8  
SETM  
SETF  
GND2 PGND  
________________________________________________________________ Maxim Integrated Products  
1
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.  
1234567...14

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MAX1577YETA MAXIM

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