MAX8570(2004) データシートの表示（PDF） - Maxim Integrated
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MAX8570 Datasheet PDF : 10 Pages
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High-Efficiency LCD Boost
with True Shutdown
VCC
SHDN
THERMAL
SHUTDOWN
MAX8570–
MAX8575
CONTROL
LOGIC
ILIM
EA
1.226V
SW
LX
OUT
(MAX8572/MAX8573/
MAX8575 ONLY)
FB
(MAX8570/MAX8571/
MAX8574 ONLY)
GND
Figure 1. Functional Diagram
C3
4.7µF
VCC = 2.7V TO 5.5V
C1
1µF
ON
OFF
L1
22µH
D1
SW
LX
C4
MAX8570
10pF
MAX8571
VCC MAX8574 FB
SHDN
GND
VOUT = VCC TO 28V
C2
1µF
R1
R2
Figure 2. Typical Application Circuit with Adjustable Output
Voltage
L1
22µH
C3
4.7µF
VCC = 2.7V TO 5.5V
C1
1µF
SW
LX
MAX8572
MAX8573
VCC MAX8575 OUT
D1 VOUT = 15V
C2
1µF
ON
SHDN
GND
OFF
Figure 3. Typical Application Circuit with 15V Preset Output
Voltage
VBATT = 0.8V TO 28V
L1
22µH
C3
4.7µF
VCC = 2.7V TO 5.5V
C1
1µF
D1
SW
LX
C4
MAX8570
10pF
MAX8571
VCC MAX8574 FB
ON
SHDN
GND
OFF
VOUT = VBATT TO 28V
C2
R1
1µF
R2
Figure 4. Using a Separate Input Supply for the Inductor
L1
22µH
C3
4.7µF
VCC = 2.7V TO 5.5V
C1
1µF
ON
OFF
SW
LX
MAX8570
MAX8571
VCC MAX8574 FB
SHDN
GND
D1
C4
10pF
C6
0.1µF D3
D2
+VOUT
C2
R1
1µF
R2
-VOUT
C5
1µF
Figure 5. Negative Output Voltage for LCD Bias
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