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MAX1640_09

更新时间： 2024-09-15 11:18:27
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美信 - MAXIM 开关
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12页 278K
描述
Adjustable-Output, Switch-Mode Current Sources with Synchronous Rectifier

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MAX1640_09 数据手册

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19-1245; Rev 2; 5/09  
Adjustable-Output, Switch-Mode  
Current Sources with Synchronous Rectifier  
_______________General Description  
____________________________Features  
♦ 95% Efficiency  
The MAX1640/MAX1641 CMOS, adjustable-output,  
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 MAX1640’s high-  
side current sensing allows the load to connect directly  
to ground, eliminating ground-potential errors. 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-  
lation (PWM) controllers use an external P-channel  
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)  
______________Ordering Information  
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*  
________________________Applications  
-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
+Denotes a lead(Pb)-free/RoHS-compliant package.  
Portable Consumer Products  
Cordless Phones  
__________Typical Operating Circuit  
Cellular Phones  
V
IN  
= +5.5V TO +26V  
PCS Phones  
IN  
LDOH  
PDRV  
Backup Battery Charger  
D0  
D1  
P
__________________ Pin Configuration  
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  
REF  
SET  
TERM  
TERM  
CC  
GND  
LDOL  
9
GND  
QSOP  
________________________________________________________________ Maxim Integrated Products  
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-  
4642, or visit Maxim’s website at www.maxim-ic.com.  
1234567...12

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MAX1640EEE-T MAXIM

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 		Switching Controller, Current-mode, 0.02A, 500kHz Switching Freq-Max, CMOS, PDSO16, 0.150
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 		Evaluation Kit for the MAX1640/MAX1641
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