MIC5157YM View Datasheet(PDF) - Micrel
Part Name
Description
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MIC5157YM Datasheet PDF : 13 Pages
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MIC5156/5157/5158
VIN
VDD
D
EN
G
MIC5158 S
R1
EA
GND
R2
R3 R4
Figure 5. Battery Charger Concept
Micrel, Inc.
Uninterruptible Power Supply
The MIC5157 and two N-channel MOSFETs provide battery
switching for uninterruptible power as shown in figure (6).
Two MOSFETs are placed source-to-source to prevent cur-
rent flow through their body diodes when switched off. The
Super LDO regulator is continuously enabled to achieve
fast battery switch-in. Careful attention must be paid to the
ac-line monitoring circuitry to ensure that the output voltage
does not fall below design limits while the battery is being
switched in.
Line
Battery
VDD
EN
D
Q1
G
G
MIC5158 S
G
EA Q2
GND
1N4148
D
S MOSFET body diodes
S shown for clarity
D
40V max.
AC
Off-line
Line
Power Supply
Uninterruptable
DC
Figure 6. UPS Power Supply Concept
August 2005
11
MIC5156/5157/5158
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