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MAX8879ETG+ PDF预览

MAX8879ETG+

更新时间： 2024-11-11 11:14:27
品牌 Logo 应用领域
美信 - MAXIM 闪光灯泵
页数 文件大小 规格书
16页 389K
描述
Charge Pump for Backlight/Flash/RGB LEDs with Safety Timer

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中文翻译

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MAX8879ETG+ 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Obsolete零件包装代码：QFN
包装说明：HVQCCN,针数：24
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：8.56
数据输入模式：SERIAL接口集成电路类型：LED DISPLAY DRIVER
JESD-30 代码：S-XQCC-N24长度：4 mm
湿度敏感等级：1复用显示功能：NO
功能数量：1区段数：11
端子数量：24最高工作温度：85 °C
最低工作温度：-40 °C封装主体材料：UNSPECIFIED
封装代码：HVQCCN封装形状：SQUARE
封装形式：CHIP CARRIER峰值回流温度（摄氏度）：NOT SPECIFIED
认证状态：Not Qualified座面最大高度：0.8 mm
最大供电电压：5.5 V最小供电电压：1.6 V
标称供电电压：1.8 V电源电压1-最大：5.5 V
电源电压1-分钟：2.7 V电源电压1-Nom：3.6 V
表面贴装：YES技术：BICMOS
温度等级：INDUSTRIAL端子形式：NO LEAD
端子节距：0.5 mm端子位置：QUAD
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：4 mm
最小 fmax：0.4 MHzBase Number Matches：1

MAX8879ETG+ 数据手册

 浏览型号MAX8879ETG+的Datasheet PDF文件第2页浏览型号MAX8879ETG+的Datasheet PDF文件第3页浏览型号MAX8879ETG+的Datasheet PDF文件第4页浏览型号MAX8879ETG+的Datasheet PDF文件第5页浏览型号MAX8879ETG+的Datasheet PDF文件第6页浏览型号MAX8879ETG+的Datasheet PDF文件第7页 
19-4266; Rev 0; 9/08  
Charge Pump for Backlight/Flash/RGB LEDs  
with Safety Timer  
MAX879  
General Description  
Features  
The MAX8879 provides complete light management for  
main display backlight, subdisplay backlight (or RGB  
indicator), and white LED camera flash with regulated  
constant current up to 610mA total. By utilizing adap-  
tive 1x/1.5x/2x charge-pump modes and very-low-  
dropout current regulators, it achieves high efficiency  
over the full 1-cell Li+ battery input voltage range. The  
1MHz fixed-frequency switching allows for tiny external  
components while the regulation scheme is optimized  
to ensure low EMI and low input ripple. An integrated  
derating function protects the LEDs from overheating  
during high ambient temperatures.  
♦ Guaranteed 610mA Continuous Drive Capability  
4 LEDs at 30mA Each for Main Display  
3 LEDs at 30mA Each for Sub or RGB  
400mA Total for Flash  
♦ 2-Wire I2C Serial Port  
5-Bit (32-Step) Linear Dimming  
32k Colors  
Ramp-Up/Down Rates  
♦ 92% Peak/83% Avg Efficiency (P  
/P  
)
LED BATT  
♦ Adaptive 1x/1.5x/2x Mode Switchover  
♦ 0.3% (typ) LED Current Accuracy and Matching  
♦ Low Input Ripple and EMI  
The MAX8879 features an internally trimmed reference  
to set the maximum LED current. An I2C serial port is  
used for on/off control and setting the LED currents in  
32 linear steps for main, sub/RGB, and movie. When  
using the RGB indicator, the I2C port provides 32k col-  
ors and programmable ramp-up/down rates. The cam-  
era flash for flash-mode operation is enabled by an  
active-low signal on the FSH pin. A safety timer is acti-  
vated on the falling edge of FSH, which has an I2C-  
adjustable (programmable) period of no timer, 0.5s,  
1.0s, or 2.0s (default). If the safety timer period expires,  
both flash and movie modes are disabled.  
♦ Low 0.1µA Shutdown Current  
♦ Output Overvoltage Protection  
♦ I2C Programmable Flash Safety Timer  
♦ Thermal Derating Function Protects LEDs  
♦ 24-Pin, 4mm x 4mm Thin QFN Package  
Ordering Information  
PIN-  
PACKAGE  
PART  
TEMP RANGE  
Applications  
24 Thin QFN  
4mm x 4mm  
MAX8879ETG+  
-40°C to +85°C  
Cell Phones and Smartphones  
PDAs, Digital Cameras, Camcorders  
Displays with Up to 11 LEDs  
Pin Configuration appears at end of data sheet.  
+Denotes a lead-free/RoHS-compliant package.  
Typical Operating Circuit  
1μF  
1μF  
INPUT  
2.7V TO 5.5V  
OUTPUT  
UP TO 610mA  
C1P  
C1N  
C2P  
C2N  
OUT  
IN  
FLASH  
MAIN  
SUB OR RGB  
PIN  
10μF  
4.7μF  
GND  
M1  
MAX8879  
M2  
M3  
M4  
S1  
V
V
DD  
LOGIC  
0.1μF  
S2  
2
S3  
I C PORT  
ON/OFF AND  
BRIGHTNESS  
SCK  
SDA  
FSH  
F1  
F2  
F3  
F4  
FLASH  
ON/OFF  
PGND  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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