MAX8520, MAX8521 Smallest TEC Power Drivers for Optical Modules

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Description

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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 external components.

The MAX8520 and 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 a space-saving 3mm x 3mm UCSP™, with a pin-selectable switching frequency of 500kHz or 1MHz.

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

Key Specifications: Multifunction PMICs

Part Number

PMIC for:

Primary Topology

Monitor/Control Features

DC-DC/Power Features

V_IN (min) (V)

V_IN (max) (V)

Min. V_OUT (V)

Max. V_OUT (V)

Operating Freq. (kHz)

Number of Step-Down Outputs

Number of Inverting Outputs

Output Adj. Method

Operating Current, I_CC (max) (mA)

EV-Kit

Package

RoHS Available

Operating Temp. Range (°C)

Price^**

MAX8520

Cable/Telecom/Fiber

H-Bridge

Output Overvoltage Protection
Shutdown
Voltage or PWM Controllable Output

Adjustable Frequency
Average Current Mode Control
Current Limit
Fixed Frequency/PWM
Internal Power Switches
Soft Start
Synchronous Rectifier
TEC Driver

5.5

-4.3

4.3

1000

Resistor
Voltage

Yes

THIN QFN/20

Yes

-40 to +85

$3.75 @ 1k

MAX8521

Average Current Mode Control
Current Limit
Fixed Frequency/PWM
Internal Power Switches
Soft Start
Synchronous Rectifier
TEC Driver

THIN QFN/20
UCSP/32
WLP/0

$3.75 @ 1k

See All Multifunction PMICs (71)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.