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部品型式

MAX653CSA

製品説明
仕様・特性

19-4505; Rev 4; 7/05 5V/3.3V/3V/Adjustable, High-Efficiency, Low IQ, Step-Down DC-DC Converters ____________________________Features The MAX639/MAX640/MAX653 step-down switching regulators provide high efficiency over a wide range of load currents, delivering up to 225mA. A current-limiting pulse-frequency-modulated (PFM) control scheme gives the devices the benefits of pulse-width-modulated (PWM) converters (high efficiency at heavy loads), while using only 10µA of supply current (vs. 2mA to 10mA for PWM converters). The result is high efficiency over a wide range of loads. ♦ High Efficiency for a Wide Range of Load Currents The MAX639/MAX640/MAX653 input range is 4V to 11.5V, and the devices provide lower preset output voltages of 5V, 3.3V, and 3V, respectively. Or, the output can be user-adjusted to any voltage from 1.3V to the input voltage. ♦ Low-Battery Detection Comparator The MAX639/MAX640/MAX653 have an internal 1A power MOSFET switch, making them ideal for minimum-component, low- and medium-power applications. For increased output drive capability, use the MAX649/MAX651/MAX652 step-down controllers, which drive an external P-channel FET to deliver up to 5W. ________________________Applications 9V Battery to 5V, 3.3V, or 3V Conversion High-Efficiency Linear Regulator Replacement Portable Instruments and Handy-Terminals ♦ 10µA Quiescent Current ♦ Output Currents Up to 225mA ♦ Preset or Adjustable Output Voltage: 5.0V (MAX639) 3.3V (MAX640) 3.0V (MAX653) ♦ Current-Limiting PFM Control Scheme ______________Ordering Information PART TEMP RANGE PIN-PACKAGE MAX639CPA 0°C to +70°C 8 Plastic DIP MAX639CSA MAX639C/D MAX639EPA MAX639ESA MAX639MJA 0°C to +70°C 0°C to +70°C -40°C to +85°C -40°C to +85°C -55°C to +125°C 8 SO Dice* 8 Plastic DIP 8 SO 8 CERDIP Ordering Information continued on last page. *Contact factory for dice specifications. 5V-to-3.3V Converters __________Typical Operating Circuit __________________Pin Configuration TOP VIEW INPUT 5.5V TO 11.5V V+ OUTPUT 5V 225mA LX VOUT LBO LOW-BATTERY DETECTOR INPUT SHDN VOUT LBI LBO LOW-BATTERY DETECTOR OUTPUT 2 LBI MAX639 ON/OFF 8 SHDN 1 3 GND MAX639 MAX640 MAX653 4 7 VFB 6 V+ 5 LX DIP/SO VFB GND ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX639/MAX640/MAX653 _______________General Description

ブランド

MAXIM

会社名

Maxim Integrated

本社国名

U.S.A

事業概要

アナログおよびミックスドシグナル半導体製品を設計、製造、販売している米国系の株式会社である。 マキシム・インテグレーテッドは、工業、通信、民生、コンピューティングの各市場向けに集積回路を開発しています

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