MAX8521：Smallest TEC Power Drivers for Optical Modules
Industry's Smallest TEC Drivers for SFF/SFP Modules Reduce Heat Generation by 50%
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 TQFN package 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 switching frequency of 500kHz or 1MHz.
Key Features
| MAX8520, MAX8521: Typical Operating Circuit Applications/Uses
|
DataSheet
| title | Download file |
|---|---|
| MAX8520-MAX8521 Data Sheet | MAX8520-MAX8521.pdf |
Parametrics
| Part Number | Primary Topology | Monitor/Control Features | DC-DC/Power Features | VIN (V) | VIN (V) | VOUT (V) | VOUT (V) | Max. IOUT (A) | Max. IOUT (A) | Oper. Freq. (kHz) | Inverting Outputs | Package/Pins | Budgetary Price |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| min | max | min | max | See Notes | |||||||||
| MAX8520 | H-Bridge | Output OVP Shutdown Volt. or PWM Controlled Output | Adj. Frequency Avg. Current Mode Control Current Limit Fixed Freq./PWM Internal Switch Soft Start Sync. Rectifier TEC Driver | 3 | 5.5 | -4.3 | 4.3 | 1.5 | 1.5 | 1000 | 1 | TQFN/20 | $8.42 @1k |
| MAX8521 | Avg. Current Mode Control Current Limit Fixed Freq./PWM Internal Switch Soft Start Sync. Rectifier TEC Driver | TQFN/20 UCSP/36 WLP/36 | $5.23 @1k | ||||||||||
Design kits & evaluation modules
Quality and Environmental Data
Ordering Information
| Part Number | Status | Recommended Replacement | Package | Temp | RoHS |
|---|---|---|---|---|---|
| MAX8521EBX | No Longer Available | UCSP,;36 pin;10 mm² | -40°C to +85°C | No | |
| MAX8521EBX-T | No Longer Available | UCSP,;36 pin;10 mm² | -40°C to +85°C | No | |
| MAX8521EBX-TW | No Longer Available | UCSP,;36 pin;10 mm² | -40°C to +85°C | No | |
| MAX8521ETP | No Longer Available | MAX8521ETP+ | TQFN,;20 pin;26 mm² | -40°C to +85°C | No |
| MAX8521ETP+ | Active | TQFN,;20 pin;26 mm² | -40°C to +85°C | Lead Free | |
| MAX8521ETP+T | Active | TQFN,;20 pin;26 mm² | -40°C to +85°C | Lead Free | |
| MAX8521ETP-T | No Longer Available | MAX8521ETP+T | TQFN,;20 pin;26 mm² | -40°C to +85°C | No |
| MAX8521EWX+ | Active | WLP,;36 pin;10.1 mm² | -40°C to +85°C | Lead Free | |
| MAX8521EWX+T | Active | WLP,;36 pin;10.1 mm² | -40°C to +85°C | Lead Free |
- MAX8520-MAX8521.pdf MAX8521
- Stabilizing Thermoelectric Controller (TEC) Loops Using a Unit-Step Response MAX8521
- HFTA-12.0: Measuring Crosstalk Penalty in High-Speed Bidirectional Serial Communication Modules DS1862
- HFAN-08.2.0: How to Control and Compensate a Thermoelectric Cooler (TEC) MAX4477
- Compact DWDM laser Temperature Control with the MAX8521 MAX5144
- MAX8521.pdf MAX8521
- 典型工作电路 MAX8521
