Rainbow-electronics MAX1730 Bedienungsanleitung PDF herunterladen (Seite 5)

MAX1730

50mA Regulated Step-Down Charge Pump

for 1.8V or 1.9V Logic

_______________________________________________________________________________________ 5

LINE-TRANSIENT RESPONSE

MAX1730 TOC07

10µs/div

OUT

AC-COUPLED

50mV/div

LOAD-TRANSIENT RESPONSE

MAX1730 TOC08

10µs/div

50mA

OUT

5mA

OUT

AC-COUPLED

20mV/div

STARTUP AND SHUTDOWN RESPONSE

MAX1730 TOC09

100µs/div

50mA/div

SHDN

5V/div

1V/div

= 72Ω

Typical Operating Characteristics (continued)

= +3.6V, FB = GND, SHDN = IN, C

= 1µF, C1 = C2 = 0.22µF, C

OUT

= 4.7µF, T

= +25°C, unless otherwise noted.)

Pin Description

Output. Bypass to GND with a 4.7µF or greater capacitor.OUT9

Input Supply. Connect to a +2.7V to +5.5V supply. Bypass to GND with a 1µF ceramic capacitor as close to

the IC as possible.

IN10

GroundGND5

Power GroundPGND6

C2 Flying Capacitor Negative ConnectionC2N7

C2 Flying Capacitor Positive ConnectionC2P8

C1 Flying Capacitor Negative ConnectionC1N4

C1 Flying Capacitor Positive ConnectionC1P3

Active-Low Shutdown Input. Connect to logic control or to IN for normal operation. OUT disconnects from the

input in shutdown and goes to high impedance.

SHDN

Feedback Input. Connect FB to GND for a 1.8V output. Connect FB to IN for a 1.9V output. Do not leave FB

unconnected.

FB1

FUNCTIONNAME

1 2 3 4 5 6 7 8

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