LM2619MTCX

更新时间： 2024-11-05 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

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LM2619MTCX 数据手册

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 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(C_OUT= 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

DS200651

www.national.com

PrintDate=2003/08/20 PrintTime=18:54:04 801627bc ds200651_p Rev. No. 1.25 cmserv Proof

Seq=1

12 3 4 5 6 7...16

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