Rainbow-electronics MAX1543 Manual do Utilizador descarregar pdf (Página 2)

MAX1542/MAX1543

TFT LCD DC-to-DC Converter with

Operational Amplifiers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

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, CTL, COMP, FB, DEL, FREQ (MAX1543)

to AGND ...............................................................-0.3V to +6V

COMP, FB, DEL to AGND .............................-0.3V to (IN + 0.3V)

PGND to AGND ..................................................................±0.3V

LX to PGND ............................................................-0.3V to +14V

SUP, POS1, NEG1, OUT1, POS2,

NEG2, OUT2 to AGND .......................................-0.3V to +14V

POS1, NEG1, OUT1, POS2, NEG2,

OUT2 to AGND ......................................-0.3V to (SUP + 0.3V)

SRC, COM to AGND...............................................-0.3V to +30V

SRC to COM ...........................................................-0.3V to +30V

SRC to DRN (MAX1543).........................................-0.3V to +30V

COM to AGND ...........................................-0.3V to (SRC + 0.3V)

DRN (MAX1543) to AGND .........................-0.3V to (SRC + 0.3V)

DRN (MAX1543) to COM.........................................-30V to +30V

MAX1542 COM RMS Output Current ...............................+75mA

MAX1543 COM RMS Output Current ...............................±50mA

OUT1, OUT2 Continuous Output Current.........................±75mA

Continuous Power Dissipation (T

= +70°C)

20-Pin Thin QFN 5mm x 5mm

(derate 20.8mW/°C above +70°C).............................1667mW

Operating Temperature Range ...........................-40°C to +85°C

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

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

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

ELECTRICAL CHARACTERISTICS

= 3V, V

SUP

= 8V, V

SRC

= 28V, FREQ = IN (MAX1543), PGND = AGND = 0, T

= 0°C to +85°C, typical values at T

= +25°C,

unless otherwise noted.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

IN Supply Range V

2.6 5.5 V

rising 2.3 2.5 2.7

IN Undervoltage Lockout

Threshold

UVLO

falling 2.2 2.35 2.5

= 1.3V, LX not switching 0.45 0.65

IN Quiescent Current I

= 1.1V, LX switching 3.6 6.5

MAX1542 55

FREQ = AGND 51

Duration to Trigger Fault

Condition

MAX1543

FREQ = IN 55

Rising edge 160

Thermal Shutdown

Hysteresis 15

°C

MAIN STEP-UP REGULATOR

Output Voltage Range V

MAIN

13 V

MAX1542 1020 1200 1380

MAX1543 FREQ = AGND 512 600 768Operating Frequency f

OSC

FREQ = IN 1020 1200 1380

kHz

Oscillator Maximum Duty Cycle 82 87 92 %

FREQ Input Low Voltage MAX1543, V

= 2.6V to 5.5V 0.3 x V

FREQ Input High Voltage MAX1543, V

= 2.6V to 5.5V

0.7 x

FREQ Pulldown Current MAX1543, V

FREQ

= 1.0V 3.5 5 6.5 µA

= +85°C 1.224 1.240 1.256

FB Regulation Voltage V

No load

= 0°C to +85°C 1.222 1.240 1.258

FB Fault Trip Level V

falling 0.96 1 1.04 V

FB Load Regulation 0 ≤ I

MAIN

≤ full load -1 %

FB Line Regulation V

= 2.6V to 5.5V -0.08 ±0.15 %/V

1 2 3 4 5 6 7 ... 19 20

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