STEVAL-ISA079V2

STEVAL-ISA079V2 High-efficiency monolithic synchronous step-down regulator based on the L6928 Data brief Features 2.0 V to 5.5 V battery input range High efficiency: up to 95% Extremely low quiescent current 1 A max shutdown supply current 800 mA max output current Adjustable output voltage from 0.6 V Low dropout operation: up to 100% duty cycle 1% output voltage accuracy 1.4 MHz switching frequency Externally synchronizable from 1 MHz to 2 STEVAL-ISA079V2 MHz Short-circuit protection RoHS compliant Description The STEVAL-ISA079V2 demonstration board is based on the L6928 DC-DC monolithic regulator, specifically designed to provide extremely high efficiency. The L6928 supply voltage can be as low as 2.0 V, allowing its use in single Li-Ion cell supplied applications. The output voltage can be selected by an external divider down to 0.6 V. The duty cycle can saturate to 100%, allowing low dropout operation. Note: Previous part number EVAL6928Q1 October 2011 Doc ID 022262 Rev 2 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 Application diagram STEVAL-ISA079V2 1 Application diagram Figure 1. Application diagram L 4.7H V =1.8V OUT 5 V LX V =2V to 5.5V CC IN 6 R3 R4 C4 100K 200K 10F SYNC 7 L6928 C1 6.3V RUN 8 10mF 1 PGOOD 6.3V 3 24 VFB R2 COMP GND 100K C3 220pF R1 10K AM10172V1 2/4 Doc ID 022262 Rev 2