Rainbow-electronics MAX1748 Manual de usuario descargar pdf (Pagina 4)

MAX1748

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 V

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 I

SUPP

FBP

= 1.5V 0.8 mA

SUPN Quiescent Current I

SUPN

FBN

= -0.1V 0.8 mA

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 V

MAIN

13 V

FB Regulation Voltage V

1.225 1.271 V

FB Input Bias Current I

= 1.25V, INTG = GND -50 50 nA

Operating Frequency F

OSC

0.75 1.25 MHz

Oscillator Maximum Duty Cycle 78 90 %

LX Switch On-Resistance R

(

)

= 100mA 0.7 Ω

LX Leakage Current

= 13V 20 µA

Phase I = soft-start (1.0ms) 0.275 0.500

LX Current Limit I

(

MAX

)

Phase IV = fully on (after 3.0ms) 1.1 2.0

FB Fault Trip Level 1.07 1.14 V

POSITIVE CHARGE PUMP

SUPP Input Supply Range V

SUPP

2.7 13 V

FBP Regulation Voltage V

FBP

1.20 1.30 V

FBP Input Bias Current I

FBP

= 1.5V -50 50 nA

DRVP PCH On-Resistance 10 Ω

FBP

= 1.213V 4 Ω

DRVP NCH On-Resistance

FBP

= 1.275V 20 kΩ

FBP Power-Ready Trip Level Rising edge 1.091 1.159 V

NEGATIVE CHARGE PUMP

SUPN Input Supply Range V

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

= 0.035V 4 Ω

DRVN NCH On-Resistance

FBN

= -0.025V 20 kΩ

FBN Power-Ready Trip Level Rising edge 80 165 mV

REFERENCE

Reference Voltage V

REF

-2µA < I

REF

< 50µA 1.223 1.269 V

Reference Undervoltage

REF

rising 0.9 1.2 V

ELECTRICAL CHARACTERISTICS (continued)

= +3.0V, SHDN = IN, V

SUPP

= V

SUPN

= 10V, TGND = PGND = GND, C

REF

= 0.22µF, C

INTG

= 470pF, T

= -40°C to +85°C,

unless otherwise noted.) (Note 1)

1 2 3 4 5 6 7 8 9 ... 15 16

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Rainbow-electronics MAX1748 Manual de usuario Pagina 4

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