MIC2560-1BWM(1999) 데이터 시트보기 (PDF) - Micrel
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MIC2560-1BWM Datasheet PDF : 12 Pages
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MIC2560
Switched VPP IN
Micrel
Drive Enable
0.1µF 1N914
(Optional Schottky)
4.7kΩ
0.01µF
1N914
0.02µF
+5V
16
2
15
3
14
MIC2560
4
13
5
12
6
11
7
10
8
9
Figure 5. Circuit for generating bias drive for the VCC switches when +12V is not readily available.
High Current VCC Operation Without a
+12V Supply
Figure 5 shows the MIC2560 with VCC switch bias provided
by a simple charge pump. This enables the system designer
to achieve full VCC performance without a +12V supply, which
is often helpful in battery powered systems that only provide
+12V when it is needed. These on-demand +12V supplies
generally have a quiescent current draw of a few milliam-
peres, which is far more than the microamperes used by the
MIC2560. The charge pump of figure 5 provides this low
current, using about 100µA when enabled. When VPP OUT =
12V is selected, however, the on-demand VPP generator
must be used, as this charge pump cannot deliver the current
required for Flash memory programming. The Schottky diode
may not be necessary, depending on the configuration of the
on-demand +12V generator and whether any other loads are
on this line.
MIC2560
8
November 1999
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