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LM3668SDX-4550 PDF预览

LM3668SDX-4550

更新时间: 2024-11-14 04:44:23
品牌 Logo 应用领域
美国国家半导体 - NSC 转换器电感器
页数 文件大小 规格书
18页 4233K
描述
1A, High Efficiency Dual Mode Single Inductor Buck-Boost DC/DC Converter

LM3668SDX-4550 技术参数

是否Rohs认证: 符合生命周期:Transferred
包装说明:HVSON, SOLCC12,.12,16Reach Compliance Code:compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.6其他特性:PULSE FREQUENCY MODULATION TECHNIQUE ALSO AVAILABLE, ALSO OPERATES AT 5V
模拟集成电路 - 其他类型:DUAL SWITCHING CONTROLLER控制模式:VOLTAGE-MODE
控制技术:PULSE WIDTH MODULATION最大输入电压:5.5 V
最小输入电压:2.5 V标称输入电压:4 V
JESD-30 代码:S-PDSO-N12JESD-609代码:e3
长度:3 mm湿度敏感等级:1
功能数量:1端子数量:12
最高工作温度:85 °C最低工作温度:-40 °C
最大输出电流:2.05 A标称输出电压:4.5 V
封装主体材料:PLASTIC/EPOXY封装代码:HVSON
封装等效代码:SOLCC12,.12,16封装形状:SQUARE
封装形式:SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度(摄氏度):260
认证状态:Not Qualified座面最大高度:0.8 mm
子类别:Switching Regulator or Controllers表面贴装:YES
切换器配置:SINGLE最大切换频率:2500 kHz
温度等级:INDUSTRIAL端子面层:Matte Tin (Sn)
端子形式:NO LEAD端子节距:0.4 mm
端子位置:DUAL处于峰值回流温度下的最长时间:NOT SPECIFIED
宽度:3 mmBase Number Matches:1

LM3668SDX-4550 数据手册

 浏览型号LM3668SDX-4550的Datasheet PDF文件第2页浏览型号LM3668SDX-4550的Datasheet PDF文件第3页浏览型号LM3668SDX-4550的Datasheet PDF文件第4页浏览型号LM3668SDX-4550的Datasheet PDF文件第5页浏览型号LM3668SDX-4550的Datasheet PDF文件第6页浏览型号LM3668SDX-4550的Datasheet PDF文件第7页 
March 21, 2008  
LM3668  
1A, High Efficiency Dual Mode Single Inductor Buck-Boost  
DC/DC Converter  
General Description  
The LM3668 is a synchronous buck-boost DC-DC converter  
optimized for powering low voltage circuits from a Li-Ion bat-  
tery and input voltage rails between 2.5V and 5.5V. It has the  
capability to support up to 1A output current over the output  
voltage range. The LM3668 regulates the output voltage over  
the complete input voltage range by automatically switching  
between buck or boost modes depending on the input volt-  
age.  
Features  
45µA typical quiescent current  
For 2.8V/3.3V and 3.0/3.4V versions:  
- 1A maximum load current for VIN = 2.8V to 5.5V  
- 800mA maximum load current for VIN = 2.7V  
- 600mA maximum load current for VIN = 2.5V  
For 4.5/5V  
- 1A maximum load current for VIN = 3.9V to 5.5V  
- 800mA maximum load current for VIN = 3.4V to 3.8V  
- 700mA maximum load current for VIN = 3.0V to 3.3V  
- 600mA maximum load current for VIN = 2.7V to 2.9V  
The LM3668 has 2 N-channel MOSFETS and 2 P-channel  
MOSFETS arranged in a topology that provides continuous  
operation through the buck and boost operating modes.  
There is a MODE pin that allows the user to choose between  
an intelligent automatic PFM-PWM mode operation and  
forced PWM operation. During PWM mode, a fixed-frequency  
2.2MHz (typ.) is used. PWM mode drives load up to 1A. Hys-  
teretic PFM mode extends the battery life through reduction  
of the quiescent current to 45µA (typ.) at light loads during  
system standby. Internal synchronous rectification provides  
high efficiency. In shutdown mode (Enable pin pulled low) the  
device turns off and reduces battery consumption to 0.01µA  
(typ.).  
2.2MHz PWM fixed switching frequency (typ.)  
Automatic PFM-PWM Mode or Forced PWM Mode  
Wide Input Voltage Range: 2.5V to 5.5V  
Internal synchronous rectification for high efficiency  
Internal soft start: 600µs Maximum start-up time after VIN  
settled  
0.01µA typical shutdown current  
Current overload and Thermal shutdown protection  
Frequency Sync Pin: 1.6MHz to 2.7MHz  
The LM3668 is available in a 12-pin LLP package. A high  
switching frequency of 2.2MHz (typ.) allows the use of tiny  
surface-mount components including a 2.2µH inductor, a  
10µF input capacitor, and a 22µF output capacitor.  
Applications  
Handset Peripherals  
MP3 players  
Pre-Regulation for linear regulators  
PDAs  
Portable Hard Disk Drives  
WiMax Modems  
Typical Applications  
20191401  
Typical Application Circuit  
20191476  
Efficiency at 3.3V Output  
© 2008 National Semiconductor Corporation  
201914  
www.national.com  

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