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MAX746CSE-T

更新时间： 2024-11-24 13:11:03
品牌 Logo 应用领域
美信 - MAXIM 控制器
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16页 158K
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MAX746CSE-T 数据手册

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19-0192; Rev 1; 11/93  
Hig h -Effic ie n c y, P WM, S t e p -Do w n ,  
N-Ch a n n e l DC-DC Co n t ro lle r  
MAX746  
_______________Ge n e ra l De s c rip t io n  
____________________________Fe a t u re s  
The MAX746 is a high-efficiency, high-current, step-down  
DC-DC power-supply controller that drives external N-chan-  
nel FETs. It provides 93% to 96% efficiency from a 6V supply  
voltage with load currents ranging from 50mA up to 3A. It  
uses a pulse-width-modulating (PWM) current-mode control  
scheme to provide precise output regulation and low output  
noise. The MAX746's 4V to 15V input voltage range, fixed  
♦ 93% to 96% Efficiency for 50mA to 3A  
Output Currents  
♦ 4V to 15V Input Voltage Range  
♦ Low 950µA Supply Current  
♦ 1.4µA Shutdown Current  
♦ Drives External N-Channel FETs  
♦ Fixed-Frequency Current-Mode PWM (Heavy Loads)  
♦ Idle-Mode PFM (Light Loads)  
TM  
5V/adjustable (Dual-Mode ) output, and adjustable current  
limit make this device ideal for a wide range of applications.  
High efficiency is maintained with light loads due to a propri-  
TM  
etary automatic pulse-skipping control (Idle-Mode ) scheme  
♦ Cycle-by-Cycle Current Limiting  
♦ 2V ±1.5% Accurate Reference Output  
♦ Adjustable Soft-Start  
that minimizes switching losses by reducing the switching fre-  
quency at light loads. The low 950µA quiescent current and  
ultra-low 1.4µA shutdown current further extend battery life.  
♦ Undervoltage Lockout  
External components are protected by the MAX746's cycle-  
by-cycle current limit. The MAX746 also features a 2V ±1.5%  
reference, a comparator for low-battery detection or level  
translating, and soft-start and shutdown capability.  
♦ Precision Comparator for Power-Fail or  
Low-Battery Warning  
______________Ord e rin g In fo rm a t io n  
The MAX747—d is c us s e d in a s e p a ra te d a ta s he e t—  
functions similarly to the MAX746, but drives P-channel logic  
level FETs.  
PART  
TEMP. RANGE  
0°C to +70°C  
PIN-PACKAGE  
16 Plastic DIP  
16 Narrow SO  
Dice*  
MAX746CPE  
MAX746CSE  
MAX746C/D  
MAX746EPE  
MAX746ESE  
MAX746MJE  
________________________Ap p lic a t io n s  
0°C to +70°C  
5V-to-3.3V Green PC Applications  
Notebook/Laptop Computers  
Personal Digital Assistants  
Battery-Operated Equipment  
Cellular Phones  
0°C to +70°C  
-40°C to +85°C  
-40°C to +85°C  
-55°C to +125°C  
16 Plastic DIP  
16 Narrow SO  
16 CERDIP  
* Contact factory for dice specifications.  
__________Typ ic a l Op e ra t in g Circ u it  
__________________P in Co n fig u ra t io n  
INPUT 6V TO 15V  
TOP VIEW  
V+  
AV+  
40mΩ  
LBO  
LBI  
SS  
GND  
V+  
CP  
1
2
3
4
5
6
7
8
16  
15  
14  
13  
12  
11  
10  
9
MAX746  
CS  
HIGH  
CP  
SHDN  
EXT  
OUTPUT  
5V  
ON/OFF  
39µH  
REF  
HIGH  
EXT  
AGND  
CS  
MAX746  
SHDN  
FB  
LOW-BATTERY  
DETECTOR INPUT  
440µF  
LBI  
OUT  
CC  
LOW-BATTERY  
DETECTOR OUTPUT  
LBO  
REF  
SS CC  
AGND  
GND  
FB  
AV+  
OUT  
DIP/SO  
™Dual-Mode and Idle-Mode are trademarks of Maxim Integrated Products.  
________________________________________________________________ Maxim Integrated Products  
1
Ca ll t o ll fre e 1 -8 0 0 -9 9 8 -8 8 0 0 fo r fre e s a m p le s o r lit e ra t u re .  
1234567...16

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