MAX667(1994) 查看數據表（PDF） - Maxim Integrated
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MAX667 Datasheet PDF : 8 Pages
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+5V/Programmable Low-Dropout
Voltage Regulator
8 IN
OUT 2
+5V OUT
MAX667
R
10µF
SET GND SHDN
6
4
5
Figure 5. Alternative Stability Scheme Using Resistor R
8 IN
OUT 2
C1
10µF
+5V OUT
MAX667
R2
1M
5 SHDN
SET 6
GND
DD
4
1
R1
332k
R3
1M
Figure 7. Connection for Minimum Quiescent Current Near
Dropout
8 IN
OUT 2
MAX667
+5V OUT
C1
10µF
10
VSHDN = 0V
8
6
DD 1
SET GND SHDN
6
4
5
R1
47k
C2
0.1µF
Figure 6. Quiescent-Current Reduction Below Dropout
put-capacitor ESR and this series resistance should, at
minimum, meet the requirements shown in Figure 4.
An upper limit to the output-capacitor ESR is important
only if step changes to the load are anticipated. Higher
ESR results in higher-amplitude output-voltage tran-
sients when the output current is varied. A Sanyo
OS-CON capacitor, whose ESR is nearly flat over tem-
perature (and is low to begin with), in series with the
appropriate resistor ensures the best load-transient
performance. A less expensive alternative is to use a
tantalum capacitor in series with the resistor.
4
2
0
0
1
23
4
5
6
INPUT VOLTAGE (V)
Figure 8. Quiescent Current Below Dropout for Circuit of
Figure 2
In most cases, inexpensive aluminum-electrolytic
capacitors work well with the MAX667 over their entire
temperature range, having sufficient ESR to ensure sta-
bility without the need for a series resistor. The ESR of
aluminium electrolytics rises, often dramatically, as
temperature decreases. For surface-mount applica-
tions, certain tantalum capacitors have sufficient ESR;
an example is the TAJB106K016 chip capacitor made
by AVX (phone: (803) 448-9411, fax: (803) 448-1943).
Battery Drain
The MAX667 uses a PNP output transistor. When the
input voltage falls below the desired output voltage, the
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