STMicroelectronics 3 A step-down switching power supply demonstration board based on the L7981 (HSOP8) STEVAL-ISA094V1 STEVAL-ISA094V1 Data Sheet

For further information contact your local STMicroelectronics sales office.

December 2011

Doc ID 022621 Rev 1

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3 A step-down switching power supply demonstration board

based on the L7981 (HSOP8)

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3 A DC output current

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4.5 V to 28 V input voltage

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Output voltage adjustable from 0.6 V

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250 kHz switching frequency, programmable 
up to 1 MHz

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Internal soft-start and enable

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Low dropout operation: 100% duty cycle

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Voltage feed-forward

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Zero load current operation

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Overcurrent and thermal protection

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RoHS compliant

The STEVAL-ISA094V1 is a step-down switching 
power supply based on STMicroelectronics’ 
L7981 switching regulator in an HSOP8 package.

The L7981 features an embedded power 
MOSFET and is capable of delivering up to 3 A of 
current to the load, depending on the application 
conditions.

The input voltage can range from 4.5 V to 28 V, 
while the output voltage can be set from 0.6 V to 
V

IN

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Requiring a minimum number of external 
components, the device includes an internal 250 
kHz switching frequency oscillator that can be 
externally adjusted up to 1 MHz.