LM2619

更新时间： 2024-11-23 00:01:07

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	832K
描述
500mA Sub-Miniature Step-Down DC-DC Converter

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LM2619 数据手册

November 2002

LM2619

500mA Sub-Miniature Step-Down DC-DC Converter

General Description

Key Specifications

n Operates from a single LiION cell (2.8V to 5.5V)

n Output voltage (1.5V to 3.6V)

The LM2619 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.

1% DC feedback voltage precision

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 (96% typ at 3.9V_IN, 3.6V_OUTand 200mA)

in PWM mode from internal synchronous rectification

n 100% Maximum Duty Cycle for Lowest Dropout

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.).

Current limit and thermal shutdown features protect the de-

vice and system during fault conditions.

Features

The LM2619 is available in a 10 bump micro SMD package.

This packaging uses National’s chip-scale micro SMD tech-

nology and offers the smallest possible size. A high switching

frequency (600kHz) allows use of tiny surface-mount com-

ponents.

n Sub-miniature 10-bump thin micro SMD 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

DS200574

www.national.com

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