MAX1822ESA Ver la hoja de datos (PDF) - Maxim Integrated
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MAX1822ESA Datasheet PDF : 10 Pages
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High-Side Power Supply
VSUPPLY A
C4
1000µF
LOW ESR
C3
1.0µF
C2
0.047µF
V
C2
0.047µF
1
C1+
8
VCC VOUT 5
7
C1-
6 C2+ MAX1822
2 C2-
GND
4
Figure 2. MAX1822 Quiescent Supply-Current Test Circuit
Output Ripple
VOUT ripple is typically 50mVp-p with VCC = +5V, C1
and C2 = 0.047µF, and C3 = 1µF (Typical Operating
Characteristics). Ripple can be reduced by increasing
the ratio between the output storage capacitors C3 and
C1 and C2. This is usually accomplished by increasing
C3 and keeping C1 and C2 in the 0.01µF to 0.047µF
range. For example, if C1 and C2 are 0.047µF (VCC
must not exceed 13V) and C3 is 10µF, output ripple
typically falls to 15mV (Typical Operating Character-
istics).
Capacitor Selection
Capacitor type is unimportant when selecting capaci-
tors for the MAX1822. However, when VCC exceeds
13V, C1 and C2 must be no greater than 0.01µF. Using
larger value capacitors with input voltages above 13V
causes excessive amounts of energy to pass through
+5V
C2
0.047µF
C2
0.047µF
1
C1+
7 C1-
8
VCC VOUT
5
6 C2+ MAX1822
2 C2-
GND
4
6-CHANNEL LOAD SWITCH
C4
C3
1µF
10µF
ALL PULLUP RESISTORS = 1M
14
74C906
2
1
4
3
ALL TRANSISTORS = 1RF541 (NOTE 2)
TO 1A LOAD
TO 1A LOAD
TO 1A LOAD
6
5
SW1
SW2
8
9
SW3
SW4
SW5
10
11
SW6
12
13
7
NOTE 1: 1µF CAPACITORS SUPPRESS SWITCHING TRANSIENTS, SIZE DEPENDS ON LOAD CURRENTS.
NOTE 2: POWER TRANSISTOR TYPE DEPENDS ON LOAD-CURRENT REQUIREMENTS.
Figure 3. Single MAX1822 Driving Six High-Side Switches
TO 1A LOAD
TO 1A LOAD
TO 1A LOAD
ALL CAPACITORS = 1µF
(NOTE 1)
6 _______________________________________________________________________________________
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