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STMicroelectronics L7987 61 V 3 A asynchronous regulator

The L7987 device is a step-down monolithic switching regulator able to deliver up to 3 A DC

STMicroelectronics L7987-product-picture

The L7987 device is a step-down monolithic switching regulator able to deliver up to 3 A DC. The output voltage adjustability ranges from 0.8 V to VIN. The wide input voltage range and the 100% duty cycle capability meet the fail safe specifications for industrial systems. The embedded switchover feature on the VBIAS pin maximizes the efficiency at light load. The adjustable current limitation, designed to select the inductor RMS current accordingly with the nominal output current, and the high switching frequency capability make the size of the application compact.

 

Key features

  • 3 A DC output current
  • 4.5 V to 61 V operating input voltage
  • RDS(On) = 250 mΩ typ.
  • Adjustable fSW (250 kHz - 1.5 MHz)

     

Additional features

  • 3 A DC output current
  • 4.5 V to 61 V operating input voltage
  • RDS(On) = 250 mΩ typ.
  • Adjustable fSW (250 kHz - 1.5 MHz)
  • Low IQ-SHD (11 μA typ. from VIN )
  • Low IQ (1 mA typ. - VIN 24 V - VOUT 3.3 V)
  • Output voltage adjustable from 0.8 V to VIN
  • Synchronization
  • Adjustable soft-start time
  • Adjustable current limitation
  • Low dropout operation (12 μs max.)
  • VBIAS improves efficiency at light load
  • PGOOD open collector output
  • Output voltage sequencing
  • Digital frequency foldback in short-circuit
  • Peak current foldback in short-circuit
  • Auto-recovery thermal shutdown

 

Applications

  • Designed for 24 V bus
  • Fail safe tolerant system
  • Programmable logic controllers (PLCs)

 

Evaluation Board

STEVAL-ISA152V1  

3.3 V/3 A high efficiency step down DC-DC converter (VIN= 4.5 to 60 V) based on the L7987

The STEVAL-ISA152V1 product evaluation board is a step-down switching power supply based on the L7987 regulator in an HTSSOP16 package. The output voltage can be set starting from 0.8 V. Low drop-out operation, with almost 100% duty cycle, can be achieved.

The L7987 is a 61 V, 3 A step-down asynchronous switching regulator with embedded power MOSFET cable of delivering up to 3 A of current, depending on the application conditions.

The embedded switch-over feature on the VBIAS pin and the light load management (pulse skipping) are intended to maximize power conversion efficiency across the entire load range.

The soft-start, current limit threshold and the switching frequency are adjustable for application optimization.

The device includes an internal 250 kHz oscillator that can be externally adjusted up to 1.5 MHz; two L7987 regulators can be synchronized in a 180° out-of-phase configuration for reduced total input RMS current

Key Features

  • 3.3 V output voltage
  • 3 A DC output current
  • 4.5 V to 60 V input voltage
  • 500 kHz switching frequency
  • 3.5 ms programmed soft-start
  • VBIAS switch-over for improved efficiency at light load
  • 180° out of phase synchronization available
  • Open drain PGOOD available
  • Auto recovery overcurrent and thermal protection
  • RoHS compliant

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