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LM2631MTC-ADJ/NOPB PDF预览

LM2631MTC-ADJ/NOPB

更新时间: 2024-01-29 02:42:28
品牌 Logo 应用领域
德州仪器 - TI 开关光电二极管
页数 文件大小 规格书
12页 683K
描述
SWITCHING CONTROLLER, 345 kHz SWITCHING FREQ-MAX, PDSO20

LM2631MTC-ADJ/NOPB 技术参数

是否Rohs认证: 符合生命周期:Obsolete
包装说明:TSSOP,Reach Compliance Code:compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.84模拟集成电路 - 其他类型:SWITCHING CONTROLLER
控制模式:CURRENT-MODE控制技术:PULSE WIDTH MODULATION
最大输入电压:30 V最小输入电压:4.5 V
标称输入电压:10 VJESD-30 代码:R-PDSO-G20
JESD-609代码:e3长度:6.5 mm
湿度敏感等级:1功能数量:1
端子数量:20封装主体材料:PLASTIC/EPOXY
封装代码:TSSOP封装形状:RECTANGULAR
封装形式:SMALL OUTLINE, THIN PROFILE, SHRINK PITCH峰值回流温度(摄氏度):260
认证状态:Not Qualified座面最大高度:1.2 mm
表面贴装:YES切换器配置:BUCK
最大切换频率:345 kHz端子面层:TIN
端子形式:GULL WING端子节距:0.65 mm
端子位置:DUAL处于峰值回流温度下的最长时间:NOT SPECIFIED
宽度:4.4 mmBase Number Matches:1

LM2631MTC-ADJ/NOPB 数据手册

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July 2005  
LM2631  
Synchronous Step-Down Power Supply Controller  
General Description  
Features  
n 4.5V to 30V input range  
n Adjustable output (1.5V to 7V)  
The LM2631 controller provides all the active functions for  
step-down (buck) switching converters. These dc-to-dc con-  
verters provide core CPU power in battery-operated sys-  
tems.  
n 200 kHz to 400 kHz adjustable operating frequency  
n Externally synchronizable  
High efficiency is achieved by using synchronous rectifica-  
tion and pulse-skipping mode operation at light load. Inex-  
pensive N-channel MOSFETs are used to reduce system  
cost. Bootstrap circuit is used to drive the high-side  
N-channel MOSFET.  
n On-board power good function  
n Precision 1.24V reference output  
n 0.8 mA typical quiescent current  
n 0.1 µA shutdown current  
n Thermal shutdown  
n Direct current limit protection  
n Input undervoltage lockout  
Current mode control scheme is used to improve line regu-  
lation and transient response, also provides cycle-by-cycle  
current limiting.  
n Output undervoltage shutdown protection  
n Output overvoltage shutdown protection  
n Programmable soft-start function  
n Tiny TSSOP package  
The operating frequency is adjustable between 200 kHz and  
400 kHz. An external shutdown pin can be used to disable  
the device and reduce the quiescent current to 0.1 µA. In low  
noise applications, bringing the FPWM pin high can force the  
device to operate in constant frequency mode. Other fea-  
tures include the external synchronization pin, and the  
PGOOD pin to indicate the state of the output voltage.  
Applications  
n Notebook and subnotebook computers  
n Cellular phones  
Protection circuitry includes thermal shutdown, undervoltage  
and overvoltage shutdown protection, soft-start capability,  
and two levels of current limits: The first level simply limits  
the load current directly; at the second level, if the load pulls  
the output voltage down below 80% of the regulated value,  
the chip will shut down. This operation is disabled during  
startup, but an internal timer will enable it if the output does  
not come up in the preset time.  
n Portable instruments  
n Battery-powered digital devices  
Typical Application Circuit  
10093701  
© 2005 National Semiconductor Corporation  
DS100937  
www.national.com  

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