data brief for further information contact your local stmicroelectronics sales office. november 2010 doc id 18237 rev 1 1/4 4 STEVAL-ISA077V1 high efficiency synchronous re ctifier step-up converter demonstration board based on the l6920db features up to 5.5 v operating input voltage internal synchronous rectifier adjustable output voltage from 1.8 v 3.3 v and 5 v fixed output voltages low battery voltage detection reverse battery protection 750 ma input current limit switching frequency up to 1 mhz rohs compliant description the STEVAL-ISA077V1 demonstration board is based on the l6920db which is a high efficiency monolithic step-up swit ching converter ic especially designed for battery powered applications, thanks to its minimum startup of 0.8 v, and a minimum operating voltage of 0.6 v. it requires only three external components to realize the conversion from battery voltage to the selected output voltage. it has a minimum output voltage of 1.8 v, which is enough to supply even the most advanced asics and microprocessors. the high switching frequency allows the user to choose small inductors and output capacitors for their designs. supervisory functions include reference voltage, low battery detection, and shutdown, which are provided with overcurrent protection. STEVAL-ISA077V1 www.st.com
circuit schematic STEVAL-ISA077V1 2/4 doc id 18237 rev 1 1 circuit schematic figure 1. schematic circuit , 8 6 " ! 4 4 , " ) 6 / 5 4 6 2 % & ' . $ ? ? ? , " / ? ? ? ? ? 3 ( $ . & " , $ 6 " ! 4 4 6 / 5 4 ? ? ? , " / ? ? ? ? ? 3 ( $ . ' . $ ' . $ * 2 . # * 2 . # 2 . # # . # # n & 2 . # 2 . # # ? ? & # ? & , ? ( ! - 6
STEVAL-ISA077V1 revision history doc id 18237 rev 1 3/4 2 revision history table 1. document revision history date revision changes 17-nov-2010 1 initial release.
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