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MAX8520

更新时间： 2024-11-17 22:55:11
品牌 Logo 应用领域
美信 - MAXIM 驱动器
页数 文件大小 规格书
19页 605K
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Smallest TEC Power Drivers for Optical Modules

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MAX8520 数据手册

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19-2586; Rev 0; 10/02  
Smallest TEC Power Drivers for  
Optical Modules  
General Description  
Features  
o Circuit Footprint of 0.31in2  
o Low-Profile Design  
The MAX8520/MAX8521 are designed to drive thermo-  
electric coolers (TECs) in space-constrained optical  
modules. Both devices deliver 1.5A output current  
and control the TEC current to eliminate harmful current  
surges. On-chip FETs minimize external components and  
high switching frequency reduces the size of external  
components.  
o On-Chip Power MOSFETs  
o High-Efficiency Switch-Mode Design  
o Ripple Cancellation for Low Noise  
The MAX8520 and MAX8521 operate from a single supply  
and bias the TEC between the outputs of two synchro-  
nous buck regulators. This operation allows for temper-  
ature control without “dead zones” or other nonlinearities  
at low current. This arrangement ensures that the control  
system does not hunt when the set point is very close to  
the natural operating point, requiring a small amount of  
heating or cooling. An analog control signal precisely  
sets the TEC current.  
o Direct Current Control Prevents TEC Current  
Surges  
o 5% Accurate Adjustable Heating/Cooling Current  
Limits  
o 2% Accurate TEC Voltage Limit  
o No Dead Zone or Hunting at Low Output Current  
o ITEC Monitors TEC Current  
Both devices feature accurate, individually adjustable  
heating current limit and cooling current limit, along  
with maximum TEC voltage limit to improve the reliability  
of optical modules. An analog output signal monitors  
the TEC current. A unique ripple cancellation scheme  
helps reduce noise.  
o 1% Accurate Voltage Reference  
o Switching Frequency Up to 1MHz  
o Synchronization (MAX8521)  
The MAX8520 is available in a 5mm x 5mm thin QFN  
package and its switching frequency is adjustable up to  
1MHz through an external resistor. The MAX8521 is also  
available in a 5mm x 5mm thin QFN, as well as a space-  
saving 3mm x 3mm UCSP™, with a pin-selectable  
switching frequency of 500kHz or 1MHz.  
Ordering Information  
PART  
TEMP RANGE  
PIN-PACKAGE  
MAX8520ETP -40°C to +85°C  
MAX8521EBX -40°C to +85°C  
20 Thin QFN 5mm x 5mm  
36 UCSP 3mm x 3mm  
20 Thin QFN 5mm x 5mm  
Applications  
MAX8521ETP  
-40°C to +85°C  
SFF/SFP Modules  
Fiber-Optic Laser Modules  
Fiber-Optic Network Equipment  
ATE  
Typical Operating Circuit  
Biotech Lab Equipment  
INPUT  
V
LX1  
PGND1  
CS  
DD  
PV  
3V TO 5.5V  
DD  
FREQ  
ON  
SHDN  
ITEC  
OFF  
TEC CURRENT  
MONITOR  
MAX8521  
OUTPUT  
OS1  
CURRENT-  
CONTROL  
SIGNAL  
CTLI  
I
= 1.5A  
TEC  
TEC  
OS2  
LX2  
COMP  
REF  
PGND2  
GND  
Pin Configurations appear at end of data sheet.  
ANALOG /DIGITAL  
TEMPERATURE CONTROL  
UCSP 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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