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MAX1641 PDF预览

MAX1641

更新时间: 2024-11-04 22:57:59
品牌 Logo 应用领域
美信 - MAXIM 开关
页数 文件大小 规格书
11页 119K
描述
Adjustable-Output, Switch-Mode Current Sources with Synchronous Rectifier

MAX1641 数据手册

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19-1245; Rev 0; 7/97  
Ad ju s t a b le -Ou t p u t , S w it c h -Mo d e  
Cu rre n t S o u rc e s w it h S yn c h ro n o u s Re c t ifie r  
0/MAX641  
_______________Ge n e ra l De s c rip t io n  
____________________________Fe a t u re s  
95% Efficiency  
The MAX1640/MAX1641 CMOS, a d jus ta b le -outp ut,  
switch-mode current sources operate from a +5.5V to  
+26V input, and are ideal for microprocessor-controlled  
battery chargers. Charging current, maximum output  
voltage, and pulse-trickle charge are programmed with  
external resistors. Programming the off-time modifies  
the switching frequency, suppressing undesirable har-  
monics in noise-sensitive circuits. The MAX1640s high-  
side current sensing allows the load to connect directly  
to g round , e limina ting g round -p ote ntia l e rrors . The  
MAX1641 incorporates a low-side current sense.  
+5.5V to +26V Input Supply Range  
2V to 24V Adjustable-Output Voltage Range  
100% Maximum Duty Cycle (Low Dropout)  
Up to 500kHz PWM Operation  
Optional Synchronous Rectifier  
16-Pin QSOP Package  
Current-Sense Accuracy: 2% (MAX1641)  
The MAX1640/MAX1641 step-down pulse-width-modu-  
la tion (PWM) c ontrolle rs use a n e xte rna l P-c ha nne l  
MOSFET switch and an optional, external N-channel  
MOSFET synchronous rectifier for increased efficiency.  
An internal low-dropout linear regulator provides power  
for the internal reference and circuitry as well as the  
gate drive for the N-channel synchronous rectifier.  
5.3% (MAX1640)  
______________Ord e rin g In fo rm a t io n  
PART  
TEMP. RANGE  
0°C to +70°C  
PIN-PACKAGE  
Dice*  
The MAX1640/MAX1641 are available in space-saving,  
16-pin narrow QSOP packages.  
MAX1640C/D  
MAX1640EEE  
MAX1641C/D  
MAX1641EEE  
-40°C to +85°C  
0°C to +70°C  
16 QSOP  
Dice*  
________________________Ap p lic a t io n s  
-40°C to +85°C  
16 QSOP  
Battery-Powered Equipment  
Laptop, Notebook, and Palmtop Computers  
Handy Terminals  
*Dice are specified at T = +25°C, DC parameters only.  
A
Portable Consumer Products  
Cordless Phones  
__________Typ ic a l Op e ra t in g Circ u it  
Cellular Phones  
V
IN  
= +5.5V TO +26V  
PCS Phones  
IN  
LDOH  
PDRV  
Backup Battery Charger  
D0  
D1  
P
__________________P in Co n fig u ra t io n  
TOFF  
REF  
NDRV  
PGND  
CS+  
R
TOFF  
TOP VIEW  
LDOL  
TOFF  
D1  
1
2
3
4
5
6
7
8
16 IN  
15 LDOH  
14 PDRV  
13 NDRV  
12 PGND  
11 CS+  
10 CS-  
SET  
OUT  
CS-  
D0  
MAX1640  
MAX1641  
CC  
MAX1640  
TERM  
REF  
SET  
TERM  
CC  
GND  
LDOL  
9
GND  
QSOP  
________________________________________________________________ Maxim Integrated Products  
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.  
For small orders, phone 408-737-7600 ext. 3468.  

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