Rainbow-electronics MAX1748 Manual de usuario descargar pdf (Pagina 7)

MAX1748

Triple-Output TFT LCD DC-DC Converter

_______________________________________________________________________________________ 7

Typical Operating Characteristics (continued)

(Circuit of Figure 5, V

= 3.3V, T

= +25°C, unless otherwise noted.)

Pin Description

MAIN

5V/div

10V

500mA/div

MAIN BOOST STARTUP WAVEFORM

MAX1748toc16

1ms/div

MAIN

= 1kΩ, V

MAIN

= 10V

SHDN

2V/div

MAIN

5V/div

10V

500mA/div

MAIN BOOST STARTUP

WAVEFORM WITH LOAD

MAX1748toc17

1ms/div

MAIN

= 10V, R

MAIN

= 50Ω (200mA)

SHDN

2V/div

MAIN

5V/div

NEG

5V/div

POS

10V/div

POWER-UP SEQUENCING

MAX1748toc18

2ms/div

MAIN

= 10V, V

NEG

= -5V, V

POS

= 15V

SHDN

2V/div

PIN NAME FUNCTION

1 RDY Active-Low Open-Drain Output. Indicates all outputs are ready. The on-resistance is 125Ω (typ).

2FB

Main Boost Regulator Feedback Input. Regulates to 1.248V nominal. Connect feedback resistive

divider to analog ground (GND).

3 INTG

Main Boost Integrator Output. If used, connect 470pF to analog ground (GND). To disable

integrator, connect to REF.

4IN

Supply Input. +2.7V to +5.5V input range. Bypass with a 0.1µF capacitor between IN and GND, as

close to the pins as possible.

5 GND Analog Ground. Connect to power ground (PGND) underneath the IC.

6 REF

Internal Reference Bypass Terminal. Connect a 0.22µF capacitor from this terminal to analog

ground (GND). External load capability to 50µA.

7 FBP

Positive Charge-Pump Regulator Feedback Input. Regulates to 1.25V nominal. Connect feedback

resistive divider to analog ground (GND).

8 FBN Negative Charge-Pump Regulator Feedback Input. Regulates to 0V nominal.

SHDN

Active-Low Logic-Level Shutdown Input. Connect SHDN to IN for normal operation.

10 DRVN Negative Charge-Pump Driver Output. Output high level is V

SUPN

, and low level is PGND.

11 SUPN Negative Charge-Pump Driver Supply Voltage. Bypass to PGND with a 0.1µF capacitor.

12 DRVP Positive Charge-Pump Driver Output. Output high level is V

SUPP

, and low level is PGND.

1 2 3 4 5 6 7 8 9 10 11 12 ... 15 16

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Rainbow-electronics MAX1748 Manual de usuario Pagina 7

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