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Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 340kB) Download   E-Mail

Description

The MAX8520/MAX8521 are designed to drive thermoelectric 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. 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 switching frequency of 500kHz or 1MHz.

An evaluation kit is available:  MAX8521EVKIT  

Key Features		Applications/Uses
Circuit Footprint of 0.31in² Low-Profile Design On-Chip Power MOSFETs High-Efficiency Switch-Mode Design Ripple Cancellation for Low Noise Direct Current Control Prevents TEC Current Surges 5% Accurate Adjustable Heating/Cooling Current Limits 2% Accurate TEC Voltage Limit No Dead Zone or Hunting at Low Output Current ITEC Monitors TEC Current 1% Accurate Voltage Reference Switching Frequency Up to 1MHz Synchronization (MAX8521)		Automated Test Equipment (ATE) Biotech Lab Equipment Fiber Optic Network Equipment Fiber-Optic Laser Modules SFF/SFP Modules

Diagram

Typical Operating Circuit

Application Notes

Application Note 3264: Compact DWDM laser Temperature Control with the MAX8521 - MAX8520, MAX8521 Application Note 3318: HFAN-08.2.0: Thermoelectric Cooler (TEC) Control - MAX8520, MAX8521 Application Note 3600: HFRD-21.0: 2.5Gbps Cooled TOSA Evaluation Board (Includes MAX3735A Laser Driver and MAX8521 TEC Controller) - MAX8521 Application Note 3766: HFTA-12.0: Measuring Crosstalk Penalty in High-Speed Bidirectional Serial Communication Modules - MAX8520, MAX8521 Application Note 3842: Stabilizing Thermoelectric Controller (TEC) Loops Using a Unit-Step Response - MAX8520, MAX8521

Evaluation Kits

MAX8521EVKIT

Reliability Reports

Reliability Report: MAX8520.pdf MAX8521.pdf Show FIT data for: MAX8520 MAX8521

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-11 of 11

MAX8520	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8520EVKIT			Active	Land Pattern: Not Available		See data sheet
MAX8520ETP			Active	TQFN;20 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0009 (PDF) Use pkgcode/variation: T2055-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8520ETP-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX8520ETP+			Active	TQFN;20 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0009 (PDF) Use pkgcode/variation: T2055+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8520ETP+T			Active	TQFN;20 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0009 (PDF) Use pkgcode/variation: T2055+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8521	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8521ETP			Active	TQFN;20 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0009 (PDF) Use pkgcode/variation: T2055-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8521ETP-T			Active	TQFN;20 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0009 (PDF) Use pkgcode/variation: T2055-4*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8521ETP+			Active	TQFN;20 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0009 (PDF) Use pkgcode/variation: T2055+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8521ETP+T			Active	TQFN;20 pin;26 mm² Outline Drawing: 21-0140 (PDF) Land Pattern: 90-0009 (PDF) Use pkgcode/variation: T2055+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8521EBX-T			Active	UCSP;32 pin;10 mm² Outline Drawing: 21-0082 (PDF) Land Pattern: Not Available Use pkgcode/variation: B36-2*	0°C to +70°C	RoHS/Lead-Free: No Materials Analysis
MAX8521EWX+T			Active	WLP;32 pin;10.1 mm² Outline Drawing: 21-0024 (PDF) Land Pattern: Not Available Use pkgcode/variation: W363A3+2*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2002-11-14

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