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MAX1685

更新时间： 2024-11-12 14:57:51
品牌 Logo 应用领域
亚德诺 - ADI 转换器
页数 文件大小 规格书
14页 293K
描述
低噪声、14V输入、1A、PWM降压型转换器

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MAX1685 数据手册

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19-1454; Rev 2; 7/01  
Low-Noise, 14V Input, 1A, PWM  
Step-Down Converters  
General Description  
Features  
The MAX1684/MAX1685 are high-efficiency, internal-  
switch, pulse-width modulation (PWM) step-down switch-  
ing regulators intended to power cellular phones,  
communicating PDAs, and handy-terminals. These  
devices deliver a guaranteed 1A output current from two  
lithium-ion (Li+) batteries. Their wide-input voltage range  
of 2.7V to 14V gives design flexibility and allows batteries  
to charge from a wall cube, since the ICs operate at the  
higher voltages that occur when the battery is removed.  
The output voltage is preset to 3.3V or can be externally  
o Up to 96% Efficiency  
o 1A Guaranteed Output Current  
o 100% Duty Cycle in Dropout  
o 2.7V to 14V Input Range (15V Absolute Max)  
1% Accurate Reference Output  
o
o 0.24Ω P-Channel On-Resistance  
o Synchronizable Switching Frequency  
adjusted from 1.25V to V .  
IN  
o Fixed-Frequency PWM Operation  
300kHz (MAX1684)  
The low on-resistance power switch and built-in synchro-  
nous rectifier provide high efficiencies of up to 96%.  
There are four modes of operation: fixed-frequency, nor-  
mal, low-power, and shutdown. The fixed-frequency  
PWM mode of operation offers excellent noise character-  
istics. The normal mode maintains high efficiency at all  
loads. The low-power mode is used to conserve power in  
standby or when full load is not required. The shutdown  
mode is used to power down the device for minimal cur-  
rent draw.  
600kHz (MAX1685)  
o 150µA Normal-Mode Quiescent Current  
o 25µA Low-Power Mode Quiescent Current  
o 2µA Shutdown Current  
o Dual Mode™ Fixed 3.3V ( 1%) Output or  
Adjustable Output (1.25V to V )  
IN  
The MAX1684 runs at 300kHz for applications that  
require highest efficiency. The MAX1685 runs at  
600kHz to allow the use of smaller external compo-  
nents. These devices can also be synchronized to an  
external clock. Other features include a 100% duty  
cycle for low-dropout applications, an auxiliary 3V/5mA  
output, and a 1% accurate reference.  
o Small 16-QSOP Package  
o Auxiliary Output (CVL): 3V/5mA  
Ordering Information  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
16 QSOP  
MAX1684EEE  
MAX1685EEE  
Both devices are available in a space-saving 16-QSOP  
package. An evaluation kit is also available to help  
speed designs. For a similar device in a 10-pin µMAX  
package with lower input voltage requirements (5.5V  
max), refer to the MAX1692 data sheet.  
16 QSOP  
Typical Operating Circuit  
Applications  
OUTPUT  
3.3V AT 1A  
INPUT  
2.7V TO 14V  
Cellular Phones  
IN  
LX  
+
+
Two-Way Radios and Walkie-Talkies  
Computer Peripherals  
AIN  
MAX1684  
MAX1685  
SHDN  
GND  
Personal Communicators  
PDAs and Handy-Terminals  
CVH  
CVL  
BOOT  
STBY  
SYNC/PWM  
FB  
Pin Configuration appears at end of data sheet.  
CC  
REF  
Dual Mode is a trademark of Maxim Integrated Products, Inc.  
________________________________________________________________ Maxim Integrated Products  
1
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.  
1234567...14

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