Rainbow-electronics MAX1885 Manual do Utilizador descarregar pdf (Página 6)

MAX1778/MAX1880–MAX1885

Quad-Output TFT LCD DC-DC

Converters with Buffer

6 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS

= +3.0V, SHDN = IN, V

SUPP

= V

SUPN

= V

SUPB

= V

SUPL

= 10V, LDOOUT = FBL, BUF- = BUFOUT, BUF+ = FLTSET = TGND =

PGND = GND, C

REF

= 0.22µF, C

BUF

= 1µF, T

= -40°C to +85°C, unless otherwise noted.) (Note 2)

PARAMETER SYMBOL CONDITIONS MIN MAX UNITS

Input Supply Range V

2.7 5.5 V

Input Undervoltage

Threshold

UVLO

Rising, 40mV hysteresis (typ) 2.2 2.6 V

MAX1778/MAX1880/

MAX1883 (f

OSC

= 1MHz)

IN Quiescent Supply

Current

FBP

= 1.5V,

FBN

= -0.2V

MAX1881/MAX1882/MAX1884/

MAX1885 (f

OSC

= 500kHz)

MAX1778/MAX1880

OSC

= 1MHz)

0.7

SUPP Quiescent Current I

SUPP

FBP

= 1.5V

MAX1881/MAX1882

OSC

= 500kHz)

0.5

MAX1778/MAX1880

OSC

= 1MHz)

0.7

SUPN Quiescent Current I

SUPN

FBN

= -0.2V

MAX1881/MAX1882

OSC

= 500kHz)

0.5

IN Shutdown Current V

SHDN

= 0, V

= 5V 10 µA

SUPP Shutdown Current

SHDN

= 0, V

SUPP

= 13V,

MAX1778/MAX1880/MAX1881/MAX1882

10 µA

SUPN Shutdown Current

SHDN

= 0, V

SUPN

= 13V,

MAX1778/MAX1880/MAX1881/MAX1882

10 µA

SUPL Shutdown Current

SHDN

= 0, V

SUPL

= 13V,

MAX1778/MAX1881/MAX1883/MAX1884

10 µA

SUPB Shutdown Current V

SHDN

= 0, V

SUPB

= 13V 13 µA

MAIN STEP-UP CONVERTER

Main Output Voltage Range V

MAIN

13 V

Integrator enabled, C

INTG

= 1000pF 1.223 1.269

FB Regulation Voltage V

Integrator disabled (INTG = REF) 1.21 1.29

FB Input Bias Current I

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

MAX1778/MAX1880/MAX1883 0.75 1.25 MHz

Operating Frequency F

OSC

MAX1881/MAX1882/MAX1884/MAX1885 375 625 kHz

Oscillator Maximum Duty

Cycle

79 91 %

LX Switch On-Resistance R

(

)

= 100mA 0.7 Ω

LX Leakage Current I

= 13V 20 µA

Phase I = soft-start (1024/f

OSC

) 0.275 0.525

LX Current Limit I

LIM

Phase IV = fully on (after 3072/f

OSC

) 1.1 2.05

FB Fault Trip Level Falling edge, FLTSET = GND 1.07 1.14 V

1 2 3 4 5 6 7 8 9 10 11 ... 37 38

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