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MAX1842

更新时间： 2024-10-04 14:57:39
品牌 Logo 应用领域
亚德诺 - ADI 开关稳压器
页数 文件大小 规格书
16页 282K
描述
1A/2.7A、1MHz、降压型稳压器，内置同步整流与开关

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MAX1842 数据手册

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19-1760; Rev 2; 9/05  
1A/2.7A, 1MHz, Step-Down Regulators with  
Synchronous Rectification and Internal Switches  
General Description  
Features  
The MAX1742/MAX1842 constant-off-time, pulse-width-  
modulated (PWM) step-down DC-DC converters are ideal  
for use in 5V and 3.3V to low-voltage conversion neces-  
sary in notebook and subnotebook computers. These  
devices feature internal synchronous rectification for high  
efficiency and reduced component count. They require  
no external Schottky diode. The internal 90mΩ PMOS  
power switch and 70mΩ NMOS synchronous-rectifier  
switch easily deliver continuous load currents up to 1A.  
The MAX1742/MAX1842 produce a preset 2.5V, 1.8V, or  
1.5V output voltage or an adjustable output from 1.1V to  
♦
1% Output Accuracy  
♦ 95% Efficiency  
♦ Internal PMOS and NMOS Switches  
90mΩ On-Resistance at V = 4.5V  
IN  
110mΩ On-Resistance at V = 3V  
IN  
♦ Output Voltage  
2.5V, 1.8V, or 1.5V Pin Selectable  
1.1V to V Adjustable  
IN  
♦ 3V to 5.5V Input Voltage Range  
V . They achieve efficiencies as high as 95%.  
IN  
♦ 600μA (max) Operating Supply Current  
♦ <1μA Shutdown Supply Current  
♦ Programmable Constant-Off-Time Operation  
♦ 1MHz (max) Switching Frequency  
♦ Idle-Mode Operation at Light Loads  
♦ Thermal Shutdown  
♦ Adjustable Soft-Start Inrush Current Limiting  
♦ 100% Duty Cycle During Low-Dropout Operation  
♦ Output Short-Circuit Protection  
The MAX1742/MAX1842 use a unique current-mode,  
constant-off-time, PWM control scheme, which includes  
Idle Mode™ to maintain high efficiency during light-load  
operation. The programmable constant-off-time architec-  
ture sets switching frequencies up to 1MHz, allowing the  
user to optimize performance trade-offs between effi-  
ciency, output switching noise, component size, and  
cost. Both devices are designed for continuous output  
currents up to 1A. The MAX1742 uses a peak current  
limit of 1.3A (min) and is suitable for applications requir-  
ing small external component size and high efficiency.  
The MAX1842 has a higher current limit of 3.1A (min)  
and is intended for applications requiring an occasional  
burst of output current up to 2.7A. Both devices also fea-  
ture an adjustable soft-start to limit surge currents during  
startup, a 100% duty cycle mode for low-dropout opera-  
tion, and a low-power shutdown mode that disconnects  
the input from the output and reduces supply current  
below 1µA. The MAX1742/MAX1842 are available in 16-  
pin QSOP packages.  
♦ 16-Pin QSOP Package  
Ordering Information  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
MAX1742EEE  
MAX1742EEE+  
MAX1842EEE  
MAX1842EEE+  
16 QSOP  
16 QSOP  
16 QSOP  
16 QSOP  
For similar devices that provide continuous output cur-  
rents up to 2A and 3A, refer to the MAX1644 and  
MAX1623 data sheets.  
+ Denotes lead-free package.  
Applications  
5V or 3.3V to Low-Voltage Conversion  
CPU I/O Ring  
Typical Configuration  
OUTPUT  
INPUT  
3V TO  
5.5V  
1.1V TO  
IN  
LX  
FB  
Chipset Supplies  
V
IN  
10Ω  
MAX1742  
MAX1842  
Notebook and Subnotebook Computers  
V
PGND  
GND  
FBSEL  
REF  
CC  
470pF  
2.2μF  
SHDN  
COMP  
TOFF  
Pin Configuration appears at end of data sheet.  
1μF  
SS  
Idle Mode is a trademark of Maxim Integrated Products.  
0.01μF  
________________________________________________________________ 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...16

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