MAX8521ETP+ Maxim Integrated Products, MAX8521ETP+ Datasheet

IC DRVR PWR TEC 20-TQFN

MAX8521ETP+

Manufacturer Part Number
MAX8521ETP+
Description
IC DRVR PWR TEC 20-TQFN
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX8521ETP+

Applications
Thermoelectric Cooler
Voltage - Supply
3 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
20-TQFN Exposed Pad
Output Voltage Range
- 4.3 V to + 4.3 V
Output Current
1.5 A
Input Voltage Range
3 V to 5.5 V
Input Current
14 mA
Power Dissipation
1.67 W
Operating Temperature Range
- 40 C to + 85 C
Mounting Style
SMD/SMT
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
Current - Supply
-
Lead Free Status / Rohs Status
Lead free / RoHS Compliant
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 TQFN pack-
age and its switching frequency is adjustable up to
1MHz through an external resistor. The MAX8521 is
also available in a 5mm x 5mm TQFN 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 2; 2/11
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)
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
** Four center bumps depopulated.
MAX8520ETP+
MAX8521EBX
MAX8521ETP+
MAX8521EWX+
TEC CURRENT
3V TO 5.5V
CURRENT-
Surges
Limits
CONTROL
MONITOR
OFF
SIGNAL
INPUT
PART
ON
Typical Operating Circuit
TEMP RANGE
-40°C to +85°C 20 TQFN - 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 TQFN - E P * 5m m x 5m m
-40°C to +85°C 36 WLP ** 3m m x 3m m
TEMPERATURE CONTROL
V
PVDD_
FREQ
SHDN
ITEC
CTLI
COMP
REF
GND
DD
ANALOG /DIGITAL
Ordering Information
MAX8521
PGND1
PGND2
2
OS1
OS2
LX1
LX2
CS
Modules
PIN-PACKAGE
Features
TEC
OUTPUT
I
TEC
= ± 1.5A
1

Related parts for MAX8521ETP+

MAX8521ETP+ Summary of contents

Page 1

... Synchronization (MAX8521) Ordering Information PART TEMP RANGE MAX8520ETP+ -40°C to +85°C 20 TQFN - MAX8521EBX -40°C to +85° -40°C to +85°C 20 TQFN - MAX8521ETP+ MAX8521EWX+ -40°C to +85°C 36 WLP ** Denotes a lead(Pb)-free/RoHS-compliant package Exposed pad. ** Four center bumps depopulated. Typical Operating Circuit INPUT V LX1 ...

Page 2

Smallest TEC Power Drivers for Optical Modules ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V DD SHDN, MAXV, MAXIP, MAXIN, CTLI to GND .........................................................-0.3V to +6V COMP, FREQ, OS1, OS2, CS, REF, ITEC to GND...........................................-0. PVDD1, PVDD2 ...

Page 3

Smallest TEC Power Drivers for Optical ELECTRICAL CHARACTERISTICS (continued 5V, 1MHz mode (Note 4). PGND1 = PGND2 = GND, CTLI = MAXV = MAXIP = MAXIN = REF, SHDN DD PVDD1 PVDD2 ...

Page 4

Smallest TEC Power Drivers for Optical Modules ELECTRICAL CHARACTERISTICS ( 5V, 1MHz mode (Note 4). PGND1 = PGND2 = GND, CTLI = MAXV = MAXIP = MAXIN = REF, SHDN DD PVDD1 PVDD2 ...

Page 5

Smallest TEC Power Drivers for Optical ELECTRICAL CHARACTERISTICS (continued 5V, 1MHz mode (Note 4). PGND1 = PGND2 = GND, CTLI = MAXV = MAXIP = MAXIN = REF, SHDN DD PVDD1 PVDD2 ...

Page 6

Smallest TEC Power Drivers for Optical Modules (V = 5V, circuit of Figure +25°C unless otherwise noted DIFFERENTIAL OUTPUT VOLTAGE RIPPLE MAX8520/21 toc04 1µ OS2 OS1 ...

Page 7

Smallest TEC Power Drivers for Optical (V = 5V, circuit of Figure +25°C unless otherwise noted SWITCHING FREQUENCY CHANGE vs. V 1200 FREQ = 1MHz 1000 800 600 FREQ = 500kHz 400 200 0 3.0 ...

Page 8

Smallest TEC Power Drivers for Optical Modules (V = 5V, circuit of Figure +25°C unless otherwise noted THERMAL STABILITY, COOLING MODE MAX8520/21 toc20 TEMPERATURE 0.001°C/div T = +25°C TEC T = +45°C A 4s/div PIN ...

Page 9

Smallest TEC Power Drivers for Optical PIN NAME TQFN UCSP/WLP 10 A5 CTLI 11 A6 GND FREQ 14 D6, D5, D4 PGND2 15 E5, E6 LX2 16 F5, F6 PVDD2 ...

Page 10

Smallest TEC Power Drivers for Optical Modules Detailed Description The MAX8520/MAX8521 TEC drivers consist of two switching buck regulators that operate together to directly control the TEC current. This configuration cre- ates a differential voltage across the TEC, allowing bi- ...

Page 11

Smallest TEC Power Drivers for Optical 1µF PVDD1 C3 1µF PGND1 PVDD2 C4 1µF PGND2 REF C6 0.1µF MAXIP MAXIN 49.9kΩ MAXV CTLI 100kΩ 243kΩ MAX4475 INPUTS Figure 1. MAX8521 Typical Application Circuit ______________________________________________________________________________________ L1 ...

Page 12

Smallest TEC Power Drivers for Optical Modules 1µF PVDD1 C3 1µF PGND1 PVDD2 C4 1µF PGND2 REF C6 0.1µF MAXIP MAXIN 49.9kΩ MAXV 100kΩ Figure 2. Typical Application Circuit for the MAX8520 with Reduced Op-Amp Count ...

Page 13

Smallest TEC Power Drivers for Optical CTLI 0.5X Figure 3. Functional Diagram of the Current-Control Loop Inductor Selection The MAX8520/MAX8521 dual buck converters operate in-phase and in complementary mode to drive the TEC differentially in a current-mode ...

Page 14

Smallest TEC Power Drivers for Optical Modules The output common-mode ripple voltage can be calcu- lated as follows LIR x I (ESR + 1 fs) RIPPLEpk-pk TEC(MAX) A 1µF ceramic capacitor with ESR of 10 ...

Page 15

Smallest TEC Power Drivers for Optical Take care not to exceed the positive or negative cur- rent limit on the TEC. Refer to the manufacturer’s data sheet for these limits. Setting Max TEC Voltage Apply a voltage to the MAXV ...

Page 16

Smallest TEC Power Drivers for Optical Modules 6) To ensure high DC-loop gain and minimum loop error, keep the board layout adjacent to the negative input pin of the integrator (U2 in Figure1) clean and free of moisture. Any contamination ...

Page 17

Smallest TEC Power Drivers for Optical ON OFF SHDN REF REF MAX V = TEC MAXV × MAXV MAX I = TEC MAXIP ) × MAXIP REF (0.15V/R ) SENSE MAX I = ...

Page 18

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2011 Maxim Integrated Products ...

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