Rainbow-electronics MAX1779 Manual do Utilizador descarregar pdf (Página 3)

MAX1779

Low-Power Triple-Output TFT LCD DC-DC

Converter

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

= +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.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

Operating Frequency

0.5 ×

OSC

FBP Regulation Voltage V

FBP

1.20 1.25 1.30

FBP Input Bias Current I

FBP

= +1.5V -50 50 nA

DRVP PCH On-Resistance

310Ω

FBP

= +1.200V 1.5 5 Ω

DRVP NCH On-Resistance

FBP

= +1.300V 20 kΩ

FBP Power-Ready Trip Level Rising edge

1.09 1.13 1.16

FBP Fault Trip Level Falling edge

1.11

Maximum RMS DRVP Current 0.1 A

NEGATIVE CHARGE PUMP

SUPN

Input Supply Range

SUPN

2.7 13 V

Operating Frequency

0.5 ×

OSC

FBN Regulation Voltage V

FBN

-50 0 50

FBN Input Bias Current I

FBN

= -0.05V -50 50 nA

DRVN PCH On-Resistance

310Ω

FBN

= +0.050V 1.5 5 Ω

DRVN NCH On-Resistance

FBN

= -0.050V 20 kΩ

FBN Power-Ready Trip Level Falling edge 80

120

165

FBN Fault Trip Level Rising edge

140 mV

Maximum RMS DRVN Current 0.1 A

REFERENCE

Reference Voltage V

REF

-2µA < I

REF

< 50µA

1.231 1.25 1.269

Reference Undervoltage

Threshold

REF

rising 0.9

1.05

1.2 V

LOGIC SIGNALS

SHDN Input Low Voltage 0.25V hysteresis (typ) 0.9 V

SHDN Input High Voltage 2.1 V

SHDN Input Current

SHDN

0.01

1 µA

RDY Output Low Voltage I

SINK

= 2mA

0.25

0.5 V

RDY Output High Voltage V

RDY

= +13V

0.01

1 µA

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

Converter 1

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