Rainbow-electronics MAX1779 Bedienungsanleitung PDF herunterladen (Seite 4)

MAX1779

Low-Power Triple-Output TFT LCD DC-DC

Converter

4 _______________________________________________________________________________________

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

IN Quiescent Supply Current I

= V

FBP

= +1.5V, V

FBN

= -0.2V 1 mA

SUPP Quiescent Current

SUPP

FBP

= +1.5V

0.55

SUPN Quiescent Current

SUPN

FBN

= -0.1V

0.55

IN Shutdown Current V

SHDN

= 0, V

= +5V 10 µA

SUPP Shutdown Current V

SHDN

= 0, V

SUPP

= +13V 10 µA

SUPN Shutdown Current V

SHDN

= 0, V

SUPN

= +13V 10 µA

MAIN BOOST CONVERTER

Output Voltage Range

MAIN

13 V

FB Regulation Voltage V

1.225 1.271

FB Input Bias Current I

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

Operating Frequency f

OSC

195 305

kHz

Oscillator Maximum Duty Cycle

79 92 %

LX Switch On-Resistance

(

)

= 100mA 2.0 Ω

LX Leakage Current

= +13V 20 µA

LX Current Limit I

LIM

350 700

FB Fault Trip Level Falling edge

1.07 1.14

POSITIVE CHARGE PUMP

SUPP Input Supply Range

SUPP

2.7 13 V

FBP Regulation Voltage V

FBP

1.20 1.30

FBP Input Bias Current I

FBP

= +1.5V -50 50 nA

DRVP PCH On-Resistance 10 Ω

FBP

= +1.200V 5 Ω

DRVP NCH On-Resistance

FBP

= +1.300V 20 kΩ

FBP Power-Ready Trip Level Rising edge

1.09 1.16

NEGATIVE CHARGE PUMP

SUPN Input Supply Range

SUPN

2.7 13 V

FBN Regulation Voltage V

FBN

-50 50 mV

FBN Input Bias Current

FBN

= -0.05V -50 50 nA

DRVN PCH On-Resistance

10 Ω

FBN

= +0.050V 5 Ω

DRVN NCH On-Resistance

FBN

= -0.050V 20 kΩ

FBN Power-Ready Trip Level Falling edge 80

165

REFERENCE

Reference Voltage V

REF

-2µA < I

REF

< 50µA

1.223 1.269

Reference Undervoltage

REF

rising 0.9 1.2 V

ELECTRICAL CHARACTERISTICS

= +3.0V, SHDN = IN, V

SUPP

= V

SUPN

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

REF

= 0.22µF, C

INTG

= 2200pF, T

= -40°C to +85°C,

unless otherwise noted.) (Note 1)

1 2 3 4 5 6 7 8 9 ... 17 18

Converter 1

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