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MAX1537ETX PDF预览

MAX1537ETX

更新时间: 2024-11-04 21:53:51
品牌 Logo 应用领域
美信 - MAXIM 电脑控制器
页数 文件大小 规格书
38页 764K
描述
High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers

MAX1537ETX 数据手册

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19-3501; Rev 0; 11/04  
High-Efficiency, 5x Output, Main Power-Supply  
Controllers for Notebook Computers  
General Description  
Features  
The MAX1533/MAX1537 are dual step-down, switch-  
mode power-supply (SMPS) controllers with synchro-  
nous rectification, intended for main 5V/3.3V power  
generation in battery-powered systems. Fixed-frequen-  
cy operation with optimal interleaving minimizes input  
ripple current from the lowest input voltages up to the  
26V maximum input. Optimal 40/60 interleaving allows  
the input voltage to go down to 8.3V before duty-cycle  
overlap occurs, compared to 180° out-of-phase regula-  
tors where the duty-cycle overlap occurs when the  
input drops below 10V. Output current sensing pro-  
vides accurate current limit using a sense resistor.  
Alternatively, power dissipation can be reduced using  
lossless inductor current sensing.  
Fixed-Frequency, Current-Mode Control  
40/60 Optimal Interleaving  
Accurate Differential Current-Sense Inputs  
Internal 5V and 3.3V Linear Regulators with  
100mA Load Capability  
Auxiliary 12V or Adjustable 150mA Linear  
Regulator (MAX1537 Only)  
Dual-Mode™ Feedback—3.3V/5V Fixed or  
Adjustable Output (Dual Mode) Voltages  
200kHz/300kHz/500kHz Switching Frequency  
Versatile Power-Up Sequencing  
Internal 5V and 3.3V linear regulators power the  
MAX1533/MAX1537 and their gate drivers, as well as  
external keep-alive loads, up to a total of 100mA. When  
the main PWM regulators are in regulation, automatic  
bootstrap switches bypass the internal linear regulators,  
providing currents up to 200mA from each linear output.  
An additional 5V to 23V adjustable internal 150mA linear  
regulator is typically used with a secondary winding to  
provide a 12V supply.  
Adjustable Overvoltage and Undervoltage  
Protection  
6V to 26V Input Range  
2V 0.75ꢀ Reference Output  
Power-Good Output  
Soft-Shutdown  
The MAX1533/MAX1537 include on-board power-up  
sequencing, a power-good (PGOOD) output, digital  
soft-start, and internal soft-shutdown output discharge  
that prevents negative voltages on shutdown. The  
MAX1533 is available in a 32-pin 5mm x 5mm thin QFN  
package, and the MAX1537 is available in a 36-pin  
6mm x 6mm thin QFN package. The exposed backside  
pad improves thermal characteristics for demanding  
linear keep-alive applications.  
5µA (typ) Shutdown Current  
Pin Configurations  
TOP VIEW  
32  
31  
30  
29  
28  
27  
26  
25  
ON5  
ON3  
1
2
3
4
5
6
7
8
24 FB5  
Applications  
23  
22  
LDO5  
DL5  
2 to 4 Li+ Cells Battery-Powered Devices  
Notebook and Subnotebook Computers  
PDAs and Mobile Communicators  
FSEL  
ILIM3  
ILIM5  
REF  
21 PGND  
MAX1533  
20  
19  
DL3  
Ordering Information  
LDO3  
GND  
18 FB3  
17  
PART  
TEMP RANGE PIN-PACKAGE  
V
CSL3  
MAX1533ETJ  
MAX1533ETJ+  
MAX1537ETX  
-40°C to +85°C 32 Thin QFN 5mm x 5mm  
-40°C to +85°C 32 Thin QFN 5mm x 5mm  
-40°C to +85°C 36 Thin QFN 6mm x 6mm  
CC  
9
10 11 12 13 14 15 16  
MAX1537ETX+ -40°C to +85°C 36 Thin QFN 6mm x 6mm  
+Denotes lead-free package.  
THIN QFN  
5mm x 5mm  
Pin Configurations continued at end of data sheet.  
Dual Mode is a trademark of Maxim Integrated Products, Inc.  
________________________________________________________________ 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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