Rainbow-electronics MAX1748 Manual do Utilizador descarregar pdf (Página 3)

MAX1748

Triple-Output TFT LCD DC-DC Converter

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ELECTRICAL CHARACTERISTICS (continued)

= +3.0V, SHDN = IN, V

SUPP

= V

SUPN

= 10V, TGND = PGND = GND, C

REF

= 0.22µF, C

INTG

= 470pF, 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 V

FBP Input Bias Current I

FBP

= 1.5V -50 50 nA

DRVP PCH On-Resistance

310Ω

FBP

= 1.213V 1.5 4 Ω

DRVP NCH On-Resistance

FBP

= 1.275V 20 kΩ

FBP Power-Ready Trip Level Rising edge 1.091 1.125 1.159 V

FBP Fault Trip Level Falling edge 1.11 V

Maximum RMS DRVP Current 0.1 A

NEGATIVE CHARGE PUMP

SUPN

Input Supply Range V

SUPN

2.7 13 V

Operating Frequency

0.5 ×

OSC

FBN Regulation Voltage V

FBN

-50 0 50 mV

FBN Input Bias Current I

FBN

= -0.05V -50 50 nA

DRVN PCH On-Resistance

310Ω

FBN

= 0.035V 1.5 4 Ω

DRVN NCH On-Resistance

FBN

= -0.025V 20 kΩ

FBN Power-Ready Trip Level Rising edge 80 110 165 mV

FBN Fault Trip Level Falling edge 130 mV

Maximum RMS DRVN Current 0.1 A

REFERENCE

Reference Voltage V

REF

-2µA < I

REF

< 50µA 1.231 1.25 1.269 V

Reference Undervoltage

Threshold

REF

rising 0.9 1.05 1.2 V

LOGIC SIGNALS

SHDN Input Low Voltage 0.4V hysteresis (typ) 0.9 V

SHDN Input High Voltage 2.1 V

SHDN Input Current I

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 ... 15 16

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