STEVAL-ISA079V2 High-efficiency monolithic synchronous step-down regulator based on the L6928 Features

STEVAL-ISA079V2 High-efficiency monolithic synchronous step-down regulator based on the L6928 Features
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 µA 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
MHz
■
Short-circuit protection
■
RoHS compliant
STEVAL-ISA079V2
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:
October 2011
Previous part number EVAL6928Q1
Doc ID 022262 Rev 2
For further information contact your local STMicroelectronics sales office.
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www.st.com
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Application diagram
1
STEVAL-ISA079V2
Application diagram
Figure 1.
Application diagram
L 4.7µH
V IN =2V to 5.5V
C1
10mF
6.3V
VC C
SYN C
RU N
V O U T=1.8V
5
LX
6
L6928
7
R4
100K
R3
200K
8
1
C4
10µF
6.3V
PG O O D
3
2
CO M P
4
C3
220pF
VFB
G ND
R2
100K
R1
10K
AM10172V1
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Doc ID 022262 Rev 2
STEVAL-ISA079V2
2
Revision history
Revision history
Table 1.
Document revision history
Date
Revision
Changes
23-Sep-2011
1
Initial release.
06-Oct-2011
2
Minor text changes on coverpage.
Doc ID 022262 Rev 2
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STEVAL-ISA079V2
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Doc ID 022262 Rev 2
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