STEVAL-ISA077V2 STMicroelectronics

STEVAL-ISA077V2 High efficiency synchronous rectifier step-up converter demonstration board based on the L6920D Data brief Features 0.6 V to 5.5 V operating input voltage 1 V startup input voltage Internal synchronous rectifier Zero shutdown current 3.3 V and 5 V fixed or adjustable Output voltage (2 V up to 5.2 V) 120 m internal active switch Low battery voltage detection Reverse battery protection RoHS compliant STEVAL-ISA077V2 Description The STEVAL-ISA077V2 demonstration board is based on the L6920D high efficiency step-up converter as well as the external components required for a typical application. Startup is guaranteed at 1 V and the device operates down to 0.6 V. The output voltage can be adjusted from 2 V to 5.2 V and two fixed output voltages (3.3 V and 5 V) are also available. November 2010 Doc ID 18238 Rev 1 1/4 For further information contact your local STMicroelectronics sales office. www.st.com 4 Circuit schematic STEVAL-ISA077V2 1 Circuit schematic Figure 1. Circuit schematic Panasonic ELL6RH100M +VBATT +VBATT VBATT L1 10H Panasonic R1 C2 7 EEFCDJ470R N.C. 47F LBI 2 GND VOUT R2 8 VOUT N.C. C1 Panasonic C3 R3 47F EEFCDJ470R N.C. VREF L6920 N.C. 4 GND C4 LBO 100nF 3 LBO 1 GND SHDN 2 6 5 SHDN 1 J1 3 R4 N.C. 1 F.B. 2 J2 3 R5 N.C. D01IN1310 not mounted components 2/4 Doc ID 18238 Rev 1