MAX8521 Maxim Integrated Products, MAX8521 Datasheet
MAX8521
Manufacturer Part Number
MAX8521
Description
Smallest TEC Power Drivers
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX8521.pdf
(18 pages)
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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.
19-2586; Rev 1; 12/08
Pin Configurations appear at end of data sheet
UCSP is a trademark of Maxim Integrated Products, Inc.
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.
SFF/SFP Modules
Fiber Optic Laser Modules
Fiber Optic Network Equipment
ATE
Biotech Lab Equipment
________________________________________________________________ Maxim Integrated Products
Smallest TEC Power Drivers for Optical
General Description
Applications
o Circuit Footprint 0.31in
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
o 5% Accurate Adjustable Heating/Cooling Current
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)
MAX8520ETP
MAX8521EBX
MAX8521ETP
MAX8521EWX+
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
** Four center bumps depopulated.
TEC CURRENT
3V TO 5.5V
Surges
Limits
CURRENT-
MONITOR
CONTROL
OFF
SIGNAL
INPUT
PART
ON
Typical Operating Circuit
TEMP RANGE
-40°C to +85°C 20 Thi n QFN - E P * 5m m x 5m m
-40°C to +85°C 6 x 6 U C S P 3m m x 3m m
-40°C to +85°C 20 Thi n Q FN - E P * 5m m x 5m m
-40°C to +85°C 36 WLP ** 3m m x 3m m
TEMPERATURE CONTROL
V
PV
FREQ
SHDN
ITEC
CTLI
COMP
REF
GND
DD
DD
ANALOG /DIGITAL
Ordering Information
MAX8521
PGND1
PGND2
2
OS1
OS2
LX1
LX2
CS
www.DataSheet4U.com
Modules
PIN-PACKAGE
Features
TEC
OUTPUT
I
TEC
= ± 1.5A
1
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