MAX8520_08,MAX8521EWX+

Part No.:
MAX8520_08,MAX8521EWX+
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Description:
Smallest TEC Power Drivers for Optical Modules
File Size:
337 K
Page:
18 Pages
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Maker:
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
PCB Prototype

July 19, 2018:

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PCB Datasheet:1PCB Datasheet:1PCB Datasheet:1PCB Datasheet:1
19-2586; Rev 1; 12/08
KIT
ATION
EVALU
E
BL
AVAILA
Smallest TEC Power Drivers for Optical
Modules
General Description
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.
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.
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.
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.
o
Circuit Footprint 0.31in
2
o
Low Profile Design
o
On-Chip Power MOSFETs
o
High-Efficiency Switch-Mode Design
o
Ripple Cancellation for Low Noise
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)
Features
MAX8520/MAX8521
Ordering Information
PART
MAX8520ETP
MAX8521EBX
MAX8521ETP
MAX8521EWX+
TEMP RANGE
PIN-PACKAGE
-40°C to +85°C 20 Thin QFN-EP* 5mm x 5mm
-40°C to +85°C 6 x 6 UCSP 3mm x 3mm
-40°C to +85°C 20 Thin QFN-EP* 5mm x 5mm
-40°C to +85°C 36 WLP** 3mm x 3mm
Applications
SFF/SFP Modules
Fiber Optic Laser Modules
Fiber Optic Network Equipment
ATE
Biotech Lab Equipment
+Denotes
a lead(Pb)-free/RoHS-compliant package.
*EP
= Exposed pad.
**Four
center bumps depopulated.
Typical Operating Circuit
INPUT
3V TO 5.5V
V
DD
PV
DD
FREQ
ON
OFF
TEC CURRENT
MONITOR
CURRENT-
CONTROL
SIGNAL
SHDN
ITEC
MAX8521
CTLI
COMP
REF
GND
PGND2
OS1
OS2
LX2
TEC
OUTPUT
I
TEC
=
±
1.5A
CS
LX1
PGND1
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.