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LM3661TLX-1.25 PDF预览

LM3661TLX-1.25

更新时间： 2024-11-14 20:27:07
品牌 Logo 应用领域
德州仪器 - TI 开关
页数 文件大小 规格书
17页 845K
描述
IC 0.454 A SWITCHING REGULATOR, 675 kHz SWITCHING FREQ-MAX, PBGA10, MICRO SMD-10, Switching Regulator or Controller

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LM3661TLX-1.25 技术参数

生命周期：Obsolete零件包装代码：BGA
包装说明：VFBGA,针数：10
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.84
模拟集成电路 - 其他类型：SWITCHING REGULATOR控制模式：CURRENT-MODE
控制技术：PULSE WIDTH MODULATION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-B10长度：2.428 mm
功能数量：1端子数量：10
最高工作温度：85 °C最低工作温度：-30 °C
最大输出电流：0.454 A封装主体材料：PLASTIC/EPOXY
封装代码：VFBGA封装形状：RECTANGULAR
封装形式：GRID ARRAY, VERY THIN PROFILE, FINE PITCH认证状态：Not Qualified
座面最大高度：0.675 mm表面贴装：YES
切换器配置：BUCK最大切换频率：675 kHz
温度等级：OTHER端子形式：BALL
端子节距：0.5 mm端子位置：BOTTOM
宽度：1.869 mmBase Number Matches：1

LM3661TLX-1.25 数据手册

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May 2005  
LM3661  
450mA Subminiature, Micropower Step-Down DC-DC  
Converter for Ultra Low-Voltage Circuits  
n
3% output voltage precision in PWM mode  
General Description  
n Miniature 10-pin micro SMD package  
n Only three tiny surface-mount external components  
required  
n Uses small ceramic capacitors  
n 8 mV typ. PWM output voltage ripple  
The LM3661 step-down DC-DC converter is optimized for  
powering ultra-low voltage circuits from a single Lithium-Ion  
cell. The device provides two pin-selectable output voltages.  
See ordering information for a list of voltage options avail-  
able . This allows adjustment for DSP or CPU voltage op-  
tions, as well as dynamic output voltage switching for re-  
n Internal synchronous rectification for high efficiency  
(92% at 2.7 VIN, 1.35 VOUT  
)
duced  
power  
consumption.  
Internal  
synchronous  
rectification provides high efficiency (92% typ. at 1.35VOUT).  
n 29 µA typ. quiescent current (Linear mode)  
n 0.5 µA typ. shutdown current  
n SYNC/MODE input for frequency synchronization from  
500 kHz to 750 kHz  
n Current and Thermal overload protection  
n High gain control loop with internal compensation  
n Up to 450mA IOUT capability for LM3661-1.35/1.4  
n Up to TBDmA IOUT capability for LM3661-1.25  
The LM3661 offers superior features and performance for  
mobile phones and similar portable applications. Pin-  
selectable PWM and Linear modes provide improved system  
control for maximizing battery life. During full-load, fixed  
frequency PWM operation reduces interference in RF and  
data acquisition applications by minimizing noise harmonics  
at sensitive IF and sampling frequencies. The SYNC/MODE  
input allows synchronization of the switching frequency in a  
range of below 500 kHz to 750 kHz to prevent noise from  
intermodulation with system frequencies. Linear operation  
reduces quiescent current to 29 µA (typ.) during system  
standby for extended battery life, while supplying up to  
15 mA. Shutdown turns the device off and reduces battery  
consumption to 0.5 µA (typ.). This device offers a selectable  
over Current Limit to protect a variety of inductors.  
Applications  
n Mobile phones  
n Hand-Held radios  
n Personal Digital Assistants  
n Palm-top PC’s and Pocket PC’s  
n Portable Instruments  
n Battery Powered Device  
The LM3661 is available in a 10 pin micro SMD package.  
This packaging uses National’s chip-scale micro SMD tech-  
nology and offers the smallest possible size. A high (600  
kHz) switching frequency allows use of tiny surface-mount  
components; only three are required—an inductor and two  
ceramic capacitors.  
Features  
n Operates from a single Li-ION cell  
n Pin selectable output voltages  
n Pin selectable Inductor Current Limit  
Typical Application Circuit  
20098802  
© 2005 National Semiconductor Corporation  
DS200988  
www.national.com  
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