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LM2757TM PDF预览

LM2757TM

更新时间: 2024-11-28 04:44:35
品牌 Logo 应用领域
美国国家半导体 - NSC 稳压器开关
页数 文件大小 规格书
14页 720K
描述
Switched Capacitor Boost Regulator with High Impedance Output in Shutdown

LM2757TM 技术参数

是否Rohs认证: 符合生命周期:Transferred
包装说明:VFBGA, BGA12,3X4,16Reach Compliance Code:compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.2模拟集成电路 - 其他类型:SWITCHED CAPACITOR REGULATOR
控制模式:VOLTAGE-MODE最大输入电压:5.5 V
最小输入电压:2.7 V标称输入电压:3.6 V
JESD-30 代码:R-PBGA-B12JESD-609代码:e1
长度:1.615 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:-30 °C
最大输出电流:0.18 A封装主体材料:PLASTIC/EPOXY
封装代码:VFBGA封装等效代码:BGA12,3X4,16
封装形状:RECTANGULAR封装形式:GRID ARRAY, VERY THIN PROFILE, FINE PITCH
峰值回流温度(摄氏度):260认证状态:Not Qualified
座面最大高度:0.675 mm子类别:Switching Regulator or Controllers
表面贴装:YES切换器配置:BOOST
最大切换频率:1552 kHz温度等级:OTHER
端子面层:Tin/Silver/Copper (Sn/Ag/Cu)端子形式:BALL
端子节距:0.4 mm端子位置:BOTTOM
处于峰值回流温度下的最长时间:40宽度:1.215 mm
Base Number Matches:1

LM2757TM 数据手册

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October 2007  
LM2757  
Switched Capacitor Boost Regulator with High Impedance  
Output in Shutdown  
General Description  
Features  
The LM2757 is a constant frequency pre-regulated switched-  
capacitor charge pump that operates at 1.25 MHz to produce  
a low-noise regulated output voltage. The device can be con-  
figured to provide up to 100 mA at 4.1V, 110 mA at 4.5V, or  
180 mA at 5V. Excellent efficiency is achieved without the use  
of an inductor by operating the charge pump in a gain of either  
3/2 or 2 according to the input voltage and output voltage op-  
tion selection.  
Inductorless solution uses only 4 small ceramic  
capacitors.  
True input-output and output-input disconnect.  
Up to 180 mA output current capability (5V).  
Selectable 4.1V, 4.5V or 5.0V output.  
Pre-regulation minimizes input current ripple.  
1.24 MHz switching frequency for a low-noise, low-ripple  
output voltage.  
Efficient dual gain converter (2X, 3/2X).  
The LM2757 presents a high impedance at the VOUT pin when  
shut down. This allows for use in applications that require the  
regulated output bus to be driven by another supply while the  
LM2757 is shut down.  
Integrated Over Current Protection.  
Integrated Thermal Shutdown Protection.  
A perfect fit for space-constrained, battery-operated applica-  
tions, the LM2757 requires only 4 small, inexpensive ceramic  
capacitors. LM2757 is a tiny 1.2 mm X 1.6 mm 12–bump micro  
SMD device. Built in soft-start, over-current protection, and  
thermal shutdown features are also included in this device.  
Tiny 1.2 mm X 1.6 mm X 0.4 mm pitch, 12–bump micro  
SMD package.  
Applications  
Keypad LED Drive  
USB/USB-OTG Power  
Cellular Phone SIM cards  
Audio amplifier power supplies  
Low-current Camera Flash  
General Purpose Li-Ion-to-5V Conversion  
Supercapacitor Charger  
Typical Application Circuit  
30033723  
30033701  
© 2007 National Semiconductor Corporation  
300337  
www.national.com  

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