Rainbow-electronics MAX1606 Manual de usuario descargar pdf (Pagina 6)

MAX1606

28V Internal Switch LCD Bias Supply

with True Shutdown

6 _______________________________________________________________________________________

Pin Description

PIN NAME FUNCTION

1 BATT

Inductor Supply Voltage, 0.8V to 5.5V. Internally connected to the source of a P-channel

MOSFET used to isolate the output from the input during shutdown. Bypass with a 10µF or

greater capacitor.

2FB

Feedback Input. Connect to a resistive divider network between the output and GND to set the

output voltage between V

BATT

and 28V. The feedback threshold is 1.25V.

IC Supply Voltage, 2.4V to 5.5V. Bypass V

to GND with a 1µF or greater capacitor.

4 GND Ground

5LX

Inductor Switching Connection. Internally connected to the drain of a 28V N-channel MOSFET.

LX is high impedance in shutdown.

6 LIM

Inductor Current-Limit Selection. Connect LIM to V

for 500mA, leave LIM floating for 250mA,

or connect LIM to GND for 125mA.

7 SHDN

Active-Low Shutdown Input. A logic low shuts down the device and reduces the supply current

to 0.1µA. When shutdown, the MAX1606 isolates the output from the input by turning off the P-

channel MOSFET between BATT and SW. Connect SHDN to V

for normal operation.

8SW

Isolation Switch Output, Inductor Connection. Internally connected to the drain of a P-channel

MOSFET used to isolate the output from the input during shutdown.

17.9V

18.1V

18V

100µs/div

LINE TRANSIENT

MAX1606 toc13

A: V

BATT

= V

= 2.4V TO 5.5V, 2V/div

B: V

OUT

= 18V, R

OUT

= 3.6kΩ, 100mV/div

500mA

20V

10V

400µs/div

SHUTDOWN WAVEFORM

MAX1606 toc15

A: V

SHDN

, 2V/div

B: V

OUT

, 10V/div, R

OUT

= 1.8kΩ

C: I

, 500mA/div

Typical Operating Characteristics (continued)

= 3.3V, V

BATT

= 3.6V, L1 = 10µH, SHDN = LIM = V

, V

OUT(NOM)

= 18V (Figure 3), T

= +25°C, unless otherwise noted.)

17.9V

500mA

18.1V

18V

10mA

40µs/div

LOAD TRANSIENT

MAX1606 toc14

A: I

OUT

= 1mA TO 10mA, 10mA/div

B: V

OUT

= 18V, 100mV/div

C: I

, 500mA/div

1 2 3 4 5 6 7 8 9 10

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Rainbow-electronics MAX1606 Manual de usuario Pagina 6

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