MAX1779 データシートの表示（PDF） - Maxim Integrated

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MAX1779

Low-Power Triple-Output TFT LCD DC-DC Converter

Maxim Integrated 

Low-Power Triple-Output TFT LCD DC-DC

Converter

Typical Operating Characteristics (continued)

(Circuit of Figure 5, VIN = +3.3V, TA = +25°C, unless otherwise noted.)

STARTUP WAVEFORM

(L = 33µH)

MAX1779-22

POWER-UP SEQUENCING

MAX1779-23

2V

0

5V

3V

500mA

0

200µs/div

A. VSHDN = 0 to 2V, 2V/div

B. VMAIN = 5V, 1V/div

C. IL, 500mA/div

RMAIN = 50Ω

2V

A

A

0

5V

B

B

0

C

-10V

C

10V

D

0

4ms/div

A. VSHDN = 0 to 2V, 2V/div

B. VMAIN = 5V, RMAIN = 50Ω, 2.5V/div

C. VNEG = -8V, RNEG = 8kΩ, 10V/div

D. VPOS = +12V, RPOS = 12kΩ, 10V/div

Pin Description

PIN

NAME

FUNCTION

1

RDY

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

2

FB

Main Boost Regulator Feedback Input. Regulates to 1.25V nominal. Connect feedback resistive

divider to analog ground (GND).

3

INTG

Main Boost Integrator Output. If used, connect 2200pF to analog ground (GND). To disable

integrator, connect to REF.

4

IN

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.

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

7

FBP

resistive divider to analog ground (GND).

8

FBN

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

9

SHDN

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

8 _______________________________________________________________________________________

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