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MAX1842

更新时间： 2024-10-02 22:57:59
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美信 - MAXIM 稳压器开关
页数 文件大小 规格书
16页 597K
描述
1A/2.7A, 1MHz, Step-Down Regulators with Synchronous Rectification and Internal Switches

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MAX1842 数据手册

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19-1760; Rev 1; 2/02  
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  
o
1ꢀ% OutOu%ꢁAAOꢂrAc  
o 95ꢀ%EffiAienAc  
o Inueꢂnrl%PM S%rnd%NM S%SwiuAhes  
90mΩ  n-ResisurnAe%ru%V =%4.5V%  
110mΩ  n-ResisurnAe%ru%V =%3V  
IN  
IN  
o  OutOu%Volurge  
2.5V,%1.8V,%oꢂ%1.5V%Pin%SeleAurble  
1.1V%uo%V ꢁdjOsurble  
IN  
o 3V%uo%5.5V%IntOu%Volurge%Rrnge  
V . They achieve efficiencies as high as 95%.  
IN  
o 600µꢁ%(mrx)% teꢂruing%SOttlc%COꢂꢂenu  
o <1µꢁ%ShOudown%SOttlc%COꢂꢂenu  
o Pꢂogꢂrmmrble%Consurnu- ff-Time% teꢂruion  
o 1MHz%(mrx)%SwiuAhing%FꢂeqOenAc  
o Idle-Mode% teꢂruion%ru%Lighu%Lords  
o Theꢂmrl%ShOudown%  
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.  
o ꢁdjOsurble%Sofu-Surꢂu%InꢂOsh%COꢂꢂenu%Limiuing  
o 100ꢀ%DOuc%CcAle%DOꢂing%Low-DꢂotoOu% teꢂruion  
o  OutOu%Shoꢂu-CiꢂAOiu%PꢂoueAuion  
o 16-Pin%QS P%PrAkrge  
Ordering Information  
PꢁRT  
TEMP%RꢁNGE  
-40°C to +85°C  
-40°C to +85°C  
PIN-PꢁCKꢁGE  
MꢁX1742EEE  
MꢁX1842EEE  
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.  
Typical Configuration  
Applications  
5V or 3.3V to Low-Voltage Conversion  
CPU I/O Ring  
OUTPUT  
INPUT  
3V TO  
5.5V  
1.1V TO  
IN  
LX  
FB  
V
IN  
10Ω  
MAX1742  
MAX1842  
Chipset Supplies  
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  
0.01µF  
Idle Mode is a trademark of Maxim Integrated Products.  
________________________________________________________________ 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.  
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