ST ISA092V1 User Manual

STEVAL-ISA092V1

2 A step-down switching demonstration board based on the L7980

Data brief

Features

■2 A DC output current

■4.5 V to 28 V input voltage

■Output voltage: 3.3 V (adjustable from 0.6 V)

■250 kHz switching frequency, programmable up to 1 MHz

■Internal soft-start and enable

■Low dropout operation: 100% duty cycle

■Voltage feed-forward

■Zero load current operation

■Overcurrent and thermal protection

STEVAL-ISA092V1

■ RoHS compliant

Description

The STEVAL-ISA092V1 is a step-down switching power supply based on the L7980 in a QFN package.

The L7980 is a step-down switching regulator with embedded Power MOSFET, so it is able to deliver up to 2 A 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 starting from 0.6 V to VIN.

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

December 2011	Doc ID 022620 Rev 1	1/4
For further information contact your local STMicroelectronics sales office.		www.st.com

Circuit schematic	STEVAL-ISA092V1

1 Circuit schematic

Figure 1. Circuit schematic

2/4	Doc ID 022620 Rev 1