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MAX1843

更新时间： 2024-10-02 22:57:59
品牌 Logo 应用领域
美信 - MAXIM 稳压器
页数 文件大小 规格书
13页 366K
描述
2.7A, 1MHz, Low-Voltage, Step-Down Regulator with Internal Synchronous Rectification in QFN Package

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MAX1843 数据手册

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19-1986; Rev 1; 3/02  
2.7A, 1MHz, Low-Voltage, Step-Down Regulator with  
Internal Synchronous Rectification in QFN Package  
General Description  
Features  
The MAX1843 constant-off-time, pulse-width modulated  
(PWM) step-down DC-DC converter is ideal for use in 5V  
and 3.3V to low-voltage conversion necessary in note-  
book and subnotebook computers. This device features  
an internal PMOS power switch and internal synchronous  
rectification for high efficiency and reduced component  
count. An external Schottky diode is not required. The  
internal 90mΩ power switch and 70mΩ NMOS synchro-  
nous-rectifier switch easily deliver continuous load cur-  
rents up to 2.7A. The MAX1843 produces a preset +2.5V,  
+1.8V, or +1.5V output voltage or an adjustable output  
ꢀ
1ꢀ% OutOu%ꢁAAOꢂrAc  
ꢀ Ut%uo%1MHz%SwiuAhing%FꢂeqOenAc  
ꢀ 95ꢀ%EffiAienAc  
ꢀ Inueꢂnrl%PM S/NM S%SwiuAhes  
90mΩ/70mΩ  n-ResisurnAe%ru%V =%+4.5V%  
110mΩ/80mΩ  n-ResisurnAe%ru%V =%+3V  
IN  
IN  
ꢀ  OutOu%Volurge  
+2.5V,%+1.8V,%oꢂ%+1.5V%Pin%SeleAurble  
+1.1V%uo%V ꢁdjOsurble  
IN  
from +1.1V to V . It achieves efficiencies as high as  
IN  
95%.  
ꢀ +3V%uo%+5.5V%IntOu%Volurge%Rrnge  
ꢀ 350µꢁ% teꢂruing%SOttlc%COꢂꢂenu  
ꢀ <1µꢁ%ShOudown%SOttlc%COꢂꢂenu  
ꢀ Pꢂogꢂrmmrble%Consurnu- ff-Time% teꢂruion  
ꢀ Idle%Mode% teꢂruion%ru%Lighu%Lords  
ꢀ Theꢂmrl%ShOudown%  
The MAX1843 uses 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 architecture sets  
switching frequencies up to 1MHz, allowing the user to  
optimize performance trade-offs between efficiency, out-  
put switching noise, component size, and cost. The  
MAX1843 features an adjustable soft-start to limit surge  
currents during startup, a 100% duty-cycle mode for low  
dropout operation, and a low-power shutdown mode that  
disconnects the input from the output and reduces sup-  
ply current below 1µA. The MAX1843 is available in a 28-  
pin QFN package with an exposed backside pad.  
ꢀ ꢁdjOsurble%Sofu-Surꢂu%InꢂOsh%COꢂꢂenu%Limiuing  
ꢀ 100ꢀ%DOuc%CcAle%DOꢂing%Low-DꢂotoOu% teꢂruion  
ꢀ  OutOu%Shoꢂu-CiꢂAOiu%PꢂoueAuion  
ꢀ 28-Pin%QFN%PrAkrge  
Applications  
5V or 3.3V to Low-Voltage Conversion  
CPU I/O Ring  
Ordering Information  
PꢁRT  
TEMP%RꢁNGE  
PIN-PꢁCKꢁGE  
MAX1843EGI  
-40°C to +85°C  
28 QFN  
Chipset Supplies  
Notebook and Subnotebook Computers  
Pin Configuration  
Typical Configuration  
TOP VIEW  
28  
27  
26  
25  
24  
23  
22  
OUTPUT  
+1.1V TO  
IN  
INPUT  
+3V TO  
+5.5V  
1
21  
N.C.  
PGND  
20 PGND  
19  
IN  
LX  
FB  
V
10Ω  
2
IN  
MAX1843  
V
PGND  
GND  
FBSEL  
REF  
LX  
3
4
5
6
LX  
CC  
470pF  
2.2µF  
IN  
N.C.  
SS  
18 LX  
MAX1843  
SHDN  
COMP  
TOFF  
17 PGND  
1µF  
16 V  
CC  
SS  
0.01µF  
COMP  
FBSEL  
15  
7
8
9
10  
11  
12  
13  
14  
Idle Mode is a trademark of Maxim Integrated Products.  
QFN  
________________________________________________________________ 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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MAX1843EGI-T MAXIM

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 		High-Speed Step-Down Controller with Accurate Current Limit for Notebook Computers
MAX1844EEP MAXIM

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 		High-Speed Step-Down Controller with Accurate Current Limit for Notebook Computers
MAX1844EEP+ MAXIM

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 		Switching Controller, Current-mode, 3A, 600kHz Switching Freq-Max, BICMOS, PDSO20, 0.150 I
MAX1844EEP-T MAXIM

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 		Switching Controller, Current-mode, 3A, 600kHz Switching Freq-Max, BICMOS, PDSO20, 0.150 I
MAX1844EGP MAXIM

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 		High-Speed Step-Down Controller with Accurate Current Limit for Notebook Computers
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