Rainbow-electronics MAX1779 Manual do Utilizador descarregar pdf (Página 2)

MAX1779

Low-Power Triple-Output TFT LCD DC-DC

Converter

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= +3.0V, SHDN = IN, V

SUPP

= V

SUPN

= +10V, TGND = PGND = GND, C

REF

= 0.22µF, C

INTG

= 2200pF, T

= 0°C to +85°C,

unless otherwise noted. Typical values are at T

= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

IN, SHDN, TGND to GND .........................................-0.3V to +6V

DRVN to GND .........................................-0.3V to (V

SUPN

+ 0.3V)

DRVP to GND..........................................-0.3V to (V

SUPP

+ 0.3V)

PGND to GND.....................................................................±0.3V

RDY to GND ...........................................................-0.3V to +14V

LX, SUPP, SUPN to PGND .....................................-0.3V to +14V

INTG, REF, FB, FBN, FBP to GND...............-0.3V to (V

+ 0.3V)

Continuous Power Dissipation (T

= +70°C)

16-Pin TSSOP (derate 9.4mW/°C above +70°C) ..........755mW

Operating Temperature Range

MAX1779EUE ..................................................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Input Supply Range V

2.7 5.5 V

Input Undervoltage Threshold

UVLO

rising, 40mV hysteresis (typ) 2.2 2.4 2.6 V

IN Quiescent Supply Current I

= V

FBP

= +1.5V, V

FBN

= -0.2V 0.5 1 mA

SUPP Quiescent Current I

SUPP

FBP

= +1.5V

0.25 0.55

SUPN Quiescent Current I

SUPN

FBN

= -0.1V

0.25 0.55

IN Shutdown Current V

SHDN

= 0, V

= +5V 0.1 10 µA

SUPP Shutdown Current V

SHDN

= 0, V

SUPP

= +13V 0.1 10 µA

SUPN Shutdown Current V

SHDN

= 0, V

SUPN

= +13V 0.1 10 µA

MAIN BOOST CONVERTER

Output Voltage Range

MAIN

13 V

FB Regulation Voltage V

1.235 1.248 1.261

FB Input Bias Current I

= +1.25V, INTG = GND -50 50 nA

Operating Frequency f

OSC

212 250 288 kHz

Oscillator Maximum Duty Cycle

79 85 92 %

Load Regulation I

MAIN

= 0 to 50mA, V

MAIN

= +5V 0.1 %

Line Regulation 0.1

% / V

Integrator Gm

320

µs

LX Switch On-Resistance

(

)

= 100mA 1.0 2.0 Ω

LX Leakage Current I

= +13V

0.01

20 µA

LX Current Limit I

LIM

350 450 650

Maximum RMS LX Current

250

FB Fault Trip Level Falling edge

1.07

1.1

1.14

POSITIVE CHARGE PUMP

SUPP

Input Supply Range

SUPP

2.7 13 V

1 2 3 4 5 6 7 ... 17 18

Converter 1

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