Rainbow-electronics MAX8575 Manual de usuario descargar pdf (Pagina 5)

MAX8570–MAX8575

High-Efficiency LCD Boost

with True Shutdown

_______________________________________________________________________________________ 5

PIN NAME FUNCTION

(MAX8570/

MAX8571/

MAX8574)

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.

OUT

(MAX8572/

MAX8573/

MAX8575)

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.

2 GND Ground

3 SHDN

Shutdown Input. A logic low at SHDN places the part in low-power shutdown mode. Pull SHDN high or

connect to V

for normal operation.

4LXInductor Switching Connection

5SW

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 V

. Connect a 1µF ceramic capacitor from

to GND.

Pin Description

LOAD TRANSIENT

MAX8570/71/73/74/75 toc15

100µs/div

OUT

100mV/div

(AC-COUPLED)

5mA/div

STARTUP AND SHUTDOWN WAVEFORMS

MAX8570/71/73/74/75 toc16

400µs/div

OUT

5V/div

10V/div

200mA/div

1.8Ω LOAD

SHDN

BOOST SOFT-START

SW TURN-ON

Typical Operating Characteristics (continued)

(MAX8571, V

= 3.6V, V

OUT

= 18V, Circuit of Figure 2, T

= +25°C, unless otherwise noted.)

1 2 3 4 5 6 7 8 9 10

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Rainbow-electronics MAX8575 Manual de usuario Pagina 5

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