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MAX8520_08

更新时间： 2024-11-18 12:10:19
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美信 - MAXIM 驱动器
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18页 337K
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Smallest TEC Power Drivers for Optical Modules

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19-2586; Rev 1; 12/08  
Smallest TEC Power Drivers for Optical  
Modules  
0/MAX8521  
General Description  
Features  
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 exter-  
nal components.  
o Circuit Footprint 0.31in2  
o Low Profile Design  
o On-Chip Power MOSFETs  
o High-Efficiency Switch-Mode Design  
o Ripple Cancellation for Low Noise  
The MAX8520/MAX8521 operate from a single supply and  
bias the TEC between the outputs of two synchronous  
buck regulators. This operation allows for temperature  
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  
o 1% Accurate Voltage Reference  
o Switching Frequency up to 1MHz  
o Synchronization (MAX8521)  
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.  
Ordering Information  
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  
space-saving 3mm x 3mm UCSP™ and 36-bump WLP  
(3mm x 3mm) packages, with a pin-selectable switch-  
ing frequency of 500kHz or 1MHz.  
PART  
TEMP RANGE  
PIN-PACKAGE  
MAX8520ETP  
MAX8521EBX  
MAX8521ETP  
MAX8521EWX+  
-40°C to +85°C 20 Thin QFN-EP* 5mm x 5mm  
-40°C to +85°C 6 x 6 UCSP 3mm x 3mm  
20 Thin QFN-EP* 5mm x 5mm  
-40°C to +85°C  
-40°C to +85°C 36 WLP** 3mm x 3mm  
+Denotes a lead(Pb)-free/RoHS-compliant package.  
*EP = Exposed pad.  
**Four center bumps depopulated.  
Applications  
SFF/SFP Modules  
Fiber Optic Laser Modules  
Fiber Optic Network Equipment  
ATE  
Typical Operating Circuit  
INPUT  
3V TO 5.5V  
V
LX1  
PGND1  
CS  
DD  
PV  
Biotech Lab Equipment  
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 Direct at 1-888-629-4642,  
or visit Maxim’s website at www.maxim-ic.com.  
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