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MAX1844

更新时间: 2024-10-02 23:45:51
品牌 Logo 应用领域
美信 - MAXIM 电脑控制器
页数 文件大小 规格书
24页 860K
描述
High-Speed Step-Down Controller with Accurate Current Limit for Notebook Computers

MAX1844 数据手册

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19-1993; Rev 3; 9/02  
High-Speed Step-Down Controller with  
Accurate Current Limit for Notebook Computers  
General Description  
Features  
The MAX1844 pulse-width modulation (PWM) controller  
provides high efficiency, excellent transient response,  
and high DC output accuracy needed for stepping  
down high-voltage batteries to generate low-voltage  
CPU core or chipset/RAM supplies in notebook com-  
puters.  
o Ultra-High Efficiency  
o Accurate Current-Limit Option  
o Quick-PWM with 100ns Load-Step Response  
o 1% V Accuracy Over Line and Load  
OUT  
o 1.8V/2.5V Fixed or 1V to 5.5V Adjustable Output  
Maxim’s proprietary Quick-PWM™ quick-response,  
constant-on-time PWM control scheme handles wide  
input/output voltage ratios with ease and provides  
100ns “instant-on” response to load transients while  
maintaining a relatively constant switching frequency.  
Efficiency is enhanced by an ability to drive very large  
synchronous-rectifier MOSFETs. Accurate current sens-  
ing to ensure reliable overload protection is available  
using an external current-sense resistor in series with  
the synchronous rectifier. Alternatively, the synchronous  
rectifier itself can be used for less accurate current  
sensing at the lowest possible power dissipation.  
Range  
o 2V to 28V Battery Input Range  
o 200/300/450/600kHz Switching Frequency  
o Adjustable Overvoltage Protection  
o Adjustable Undervoltage Protection  
o 1.7ms Digital Soft-Start  
o Drives Large Synchronous-Rectifier FETs  
o 2V 1% Reference Output  
Single-stage buck conversion allows the MAX1844 to  
directly step down high-voltage batteries for the highest  
possible efficiency. Alternatively, two-stage conversion  
(stepping down the 5V system supply instead of the  
battery) at a higher switching frequency allows the mini-  
mum possible physical size.  
o Power-Good Window Comparator  
Ordering Information  
PART  
TEMP RANGE  
-40°C to +85°C  
-40°C to +85°C  
-40°C to +85°C  
PIN-PACKAGE  
20 QSOP  
MAX1844EEP  
MAX1844EGP*  
MAX1844ETP  
The MAX1844 is intended for CPU core, chipset,  
DRAM, or other low-voltage supplies as low as 1V. It is  
available in 20-pin QSOP, and QFN packages and  
includes both adjustable overvoltage and undervoltage  
protection.  
20 QFN  
20 Thin QFN  
Minimal Operating Circuit  
For a dual step-down PWM controller with accurate cur-  
rent limit, refer to the MAX1845. The MAX1714/ MAX1715  
single/dual PWM controllers are similar to the MAX1844/  
MAX1845 but do not use current-sense resistors.  
BATTERY  
4.5V TO 28V  
5V INPUT  
V
V
DD  
V+  
CC  
SHDN  
Applications  
UVP  
Notebook Computers  
BST  
DH  
ILIM  
CPU Core Supplies  
OUTPUT  
2.5V  
MAX1844  
REF  
Chipset/RAM Supplies as Low as 1V  
1.8V and 2.5V Supplies  
LX  
DL  
CS  
PGOOD  
LATCH  
OVP  
OUT  
*Contact factory for availability.  
FB  
SKIP  
Quick-PWM is a trademark of Maxim Integrated Products.  
Pin Configuration appears at end of data sheet.  
GND  
________________________________________________________________ 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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