Rainbow-electronics MAX1885 Manual do Utilizador descarregar pdf (Página 8)

MAX1778/MAX1880–MAX1885

Quad-Output TFT LCD DC-DC

Converters with Buffer

8 _______________________________________________________________________________________

ELECTRICAL CHARACTERISTICS (continued)

= +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 Bias Current I

BIAS

= 5V -500 +500 nA

Input Offset Current I

= 5V -500 +500 nA

BUFOUT

= 0 4.988 5.012

BUFOUT

= ±5mA 4.97 5.03Output Voltage V

BUFOUT

BUF+ = GND

BUFOUT

= ±45mA 4.93 5.07

BUFOUT

= ±5mA -30 30

Input Offset Voltage V

SUPB

= 4.5V to 13V

= 1.2V to

SUPB

- 1.2V)

BUFOUT

= ±45mA -70 70

Output Voltage Swing High V

BUFOUT

= -45mA, ∆V

= 1V 9 V

Output Voltage Swing Low V

BUFOUT

= +45mA, ∆V

= 1V 1 V

BUF+ Dual Mode

Threshold Voltage

Falling edge, 20mV hysteresis (typ) 80 170 mV

REFERENCE

Reference Voltage V

REF

-2µA < I

REF

< 50µA 1.223 1.269 V

Reference Undervoltage

Threshold

0.9 1.2 V

LOGIC SIGNALS

SHDN Input Low Voltage 0.9 V

SHDN Input High Voltage 2.1 V

SHDN Input Current I

SHDN

1µA

FLTSET Input Voltage Range 0.74 x V

REF

0.85 x V

REF

FLTSET Threshold Voltage Rising edge, 25mV hysteresis (typ) 80 170 mV

FLTSET Input Current V

FLTSET

= 1V 50 nA

RDY Output Low Voltage I

SINK

= 2mA 0.5 V

RDY Output High Leakage V

RDY

= 13V 1 µA

Note 1: Dropout Voltage is defined as the V

SUPL

- V

LDOOUT

, when V

SUPL

is 100mV below the set value of V

LDOOUT

Note 2: Specifications to -40°C are guaranteed by design, not production tested.

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