MAX8570 データシートの表示（PDF） - Maxim Integrated
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MAX8570 Datasheet PDF : 11 Pages
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High-Efficiency LCD Boost
with True Shutdown
Typical Operating Characteristics (continued)
(MAX8571, VCC = 3.6V, VOUT = 18V, Circuit of Figure 2, TA = +25°C, unless otherwise noted.)
LOAD TRANSIENT
MAX8570/71/73/74/75 toc15
STARTUP AND SHUTDOWN WAVEFORMS
MAX8570/71/73/74/75 toc16
VOUT
100mV/div
VSHDN
BOOST SOFT-START
5V/div
(AC-COUPLED)
SW TURN-ON
VOUT
10V/div
0
5mA/div
IOUT
0
ILX
200mA/div
100µs/div
0
400µs/div
1.8Ω LOAD
PIN
MAX8570
(µDFN)
MAX8570/
MAX8571/
MAX8574
(SOT23)
MAX8572/
MAX8573/
MAX8575
(SOT23)
3
1
—
—
—
1
2
2
2
1
3
3
6
4
4
5
5
5
4
6
6
NAME
FB
OUT
GND
SHDN
LX
SW
VCC
Pin Description
FUNCTION
Feedback for Setting the Output Voltage. Connect FB to the center of a resistor
voltage-divider from the output to GND to set positive output voltages.
Output. The output voltage is preset to 15V. Connect a 1µF ceramic capacitor
from OUT to GND. In shutdown, OUT is pulled to GND by an internal 7.5MΩ
resistor.
Ground
Shutdown Input. A logic-low at SHDN places the part in low-power shutdown
mode. Pull SHDN high or connect to VCC for normal operation.
Inductor Switching Connection
Isolation Switch Output. Internally connected to the drain of a p-channel
MOSFET used to isolate the output from the input during shutdown. Connect a
4.7µF ceramic capacitor from SW to GND. If true shutdown is not required, SW
can be left open with the input supply connected directly to the inductor.
Input Voltage Supply. Connect a 2.7V to 5.5V input supply to VCC. Connect a
1µF ceramic capacitor from VCC to GND.
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