High efficiency synchronous rectifier step-up converter
demonstration board based on the L6920D
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 mΩ internal active switch
■ Low battery voltage detection
■ Reverse battery protection
■ RoHS compliant
STEVAL-ISA077V2
Data brief
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
+VBATT
R1
N.C.
LBI
VBATT
7
2
ELL6RH100M
L1 10µH
C2
47µF
+VBATT
Panasonic
EEFCDJ470R
GND
R2
N.C.
C4
100nF
VREF
L6920
4
GND
6
1
F.B.
not mounted components
VOUT
8
Panasonic
EEFCDJ470R
R3
3
C
N.C.
C1
47µF
N.C.
VOUT
GND
LBO
3
J1
1
2
3
1
R4 N.C.
SHDN
5
LBO
SHDN
2
J2
3
R5 N.C.
D01IN1310
2/4 Doc ID 18238 Rev 1
STEVAL-ISA077V2 Revision history
2 Revision history
Table 1. Document revision history
Date Revision Changes
17-Nov-2010 1 Initial release.
Doc ID 18238 Rev 1 3/4
STEVAL-ISA077V2
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4/4 Doc ID 18238 Rev 1
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