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Radiation Hardened Point-of-Load (PoL)

ZES302, Point-of-Load (PoL) is a radiation-hardened high efficiency synchronous buck regulator with integrated power transistors that can deliver up to 3A of output current. This single chip operates over an input voltage of 3V to 5.5V and provides a regulated output voltage that is externally adjustable from 0.8V to PVIN−0.8V.

 

 

Summary
  • Integrated power transistors
  • 3A maximum output current
  • Optimized high power efficiency, >92% peak
  • ‘Plug-and-play’ parallel operation with redundancy
  • Configurable Soft-Start
  • Innate over-current protection
  • Power-good output voltage monitor
  • Compatible with small size inductor Fast transient
  • Full Mil-temp range operation (TA = −55°C to +125°C)
  • Qualified for Space Enhanced Plastic (SEP)
  • Space qualified technology
  • Radiation Hardened by Design (RHBD)

Product Offering

 
Part Number
 
 
Model
 
Electrical Performance
Max Input
Voltage		 Output
Voltage		 Max Output
Current		 Operating
Temperature
Radiation Performance
TID
 
SEL
 
SEU
 
Package Type Datasheet
ZES302POLFQ-EP Flight Model
5.5V 4.7V - 0.8V 3A -55°C to 125°C
300 Krad 110 MeV-cm2 /mg 110 MeV-cm2 /mg
QFN40L (5x5)mm
ZES302POLGQ-EP Ground Model
5.5V 4.7V - 0.8V 3A 25C
300 Krad 110 MeV-cm2 /mg 110 MeV-cm2 /mg
QFN40L (5x5)mm
ZES302POLGEV-EP S  
- - Evaluation Kit -
- Evaluation Kit -
-
Target Applications
  • Satellite’s Power Management
  • Radiation hardened and tolerant Power Distribution
  • Advanced low-power FPGA

The ZES302 is a synchronous DCDC buck regulator integrated circuit and excels in space and other high-radiation environments, offering:

  • • High efficiency across a wide load range
  • • Excellent voltage regulation under varying input and load conditions
  • • Robust radiation tolerance, ensuring reliable operation in harsh cosmic environments

This Point of Load Converter is ideal for space missions and other applications requiring high-performance, radiation-hardened power solutions.

 

Key Features & Benefits

  • • Synchronous DC-DC buck regulator with integrated control system
  • • Combines Voltage-Mode Hysteretic Control (VMHC) and Current-Mode Hysteretic Control (CMHC)
  • • Operates in both Discontinuous Conduction Mode (DCM) and Continuous Conduction Mode (CCM)
  • • Achieves high efficiency across all load conditions
  • • Provides excellent line and load regulation
  • • Offers fast transient response
  • • Maintains quasi-fixed switching frequency for predictable EMI performance

 

Performance Highlights

  • • Efficiency
  • • Peak efficiency of over 95% at moderate loads
  • • Maintains high efficiency (>90%) from 0.01A to 3A output current
  • • Line Regulation
  • • Tight output voltage control (2.475V to 2.525V) across input range (3V to 5.5V)
  • • Load Regulation
  • • Stable output voltage (2.5V to 2.535V) across load range (0.5A to 3A)