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LM2619MTCX PDF预览

LM2619MTCX

更新时间: 2024-11-22 22:26:07
品牌 Logo 应用领域
美国国家半导体 - NSC 转换器
页数 文件大小 规格书
16页 796K
描述
500mA Step-Down DC-DC Converter

LM2619MTCX 数据手册

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August 2003  
LM2619MTC  
500mA Step-Down DC-DC Converter  
General Description  
Key Specifications  
n Operates from a single LiION cell (2.8V to 5.5V)  
n Output voltage range of 1.5V to 3.6V  
2% DC feedback voltage precision  
The LM2619MTC step down DC-DC converter is optimized  
for powering circuits from a single Lithium-Ion cell. It steps  
down an input voltage of 2.8V to 5.5V to an output of 1.5V to  
3.6V at up to 500mA. Output voltage is set using resistor  
feedback dividers.  
n
n 500mA maximum load capability  
n 600µA typ PWM mode quiescent current  
n 0.02µA typ shutdown current  
n 600kHz PWM switching frequency  
n SYNC input for PWM mode frequency synchronization  
from 500kHz to 1MHz  
n High efficiency (Up to 95%) in PWM mode from internal  
synchronous rectification  
The device offers three modes for mobile phones and similar  
portable applications. Fixed-frequency PWM mode mini-  
mizes RF interference. A SYNC input allows synchronizing  
the switching frequency in a range of 500kHz to 1MHz. Low  
current hysteretic PFM mode reduces quiescent current to  
160µA (typ). Shutdown mode turns the device off and re-  
duces battery consumption to 0.02µA (typ.).  
n 100% Maximum Duty Cycle for Lowest Dropout  
Current limit and thermal shutdown features protect the de-  
vice and system during fault conditions.  
Features  
The LM2619MTC is available in a 14 pin TSSOP package. A  
high switching frequency (600kHz) allows use of tiny  
surface-mount components.  
n 14-pin TSSOP package  
n Uses small ceramic capacitors  
n 5mV typ PWM mode output voltage ripple(COUT = 22µF)  
n Internal soft start  
The device features external compensation to tailor the re-  
sponse to a wide range of operating conditions.  
n Current overload protection  
n Thermal Shutdown  
n External compensation  
Applications  
n Mobile Phones  
n Hand-Held Radios  
n RF PC Cards  
n Wireless LAN Cards  
Typical Application Circuits  
20065101  
FIGURE 1. Typical Circuit for 1.8V Output Voltage  
© 2003 National Semiconductor Corporation  
DS200651  
www.national.com  
PrintDate=2003/08/20 PrintTime=18:54:04 801627bc ds200651_p Rev. No. 1.25 cmserv Proof  
Seq=1  

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