Rainbow-electronics MAX8758 Manual de usuario descargar pdf (Pagina 2)

MAX8758

Step-Up Regulator with Switch Control and

Operational Amplifier for TFT LCD

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= V

SHDN

= +3V, OUT = +10V, FREQ = GND, T

= 0°C to +85°C, unless otherwise noted. Typical values are at T

= +25°C.)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

IN, SHDN, CTL, LDO to GND ...................................-0.3V to +6V

SUPB, LX, OUT to GND..........................................-0.3V to +14V

OUTB, NEGB, POSB to GND ..................-0.3V to (SUPB + 0.3V)

THR, DLP, MODE, FREQ, COMP, FB,

SS to GND..............................................-0.3V to V

LDO

+ 0.3V

PGND to GND ......................................................-0.3V to + 0.3V

SRC to GND ..........................................................-0.3V to + 30V

GON, DRN to GND ....................................-0.3V to V

SRC

+ 0.3V

GON RMS Current Rating................................................± 50mA

OUTB RMS Current Rating ..............................................± 60mA

LX RMS Current Rating .........................................................1.6A

Continuous Power Dissipation (T

= +70°C)

24-Pin, 4mm x 4mm Thin QFN

(derate 16.9mW/°C above +70°C)..........................1349.1mW

Operating Temperature Range ...........................-40°C to +85°C

Junction Temperature......................................................+150°C

Storage Temperature Range .............................-65°C to +160°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER CONDITIONS

MIN

TYP

MAX

UNITS

IN Input Voltage Range 1.8 5.5 V

IN Quiescent Current V

= 3V, V

= 1.5V 27 40 µA

IN Undervoltage Lockout

IN rising, 200mV hysteresis, LX remains off below

this level

1.3

1.75

LDO Output Voltage

6V ≤ V

OUT

≤ 13V, I

LDO

= 12.5mA, V

= 1.5V (Note1)

4.8 5.0 5.2 V

LDO Undervoltage Lockout Voltage LDO rising, 200mV hysteresis 2.4 2.7 3.0 V

OUT Supply Voltage Range (Note 1) 4.5

13.0

OUT Overvoltage Fault Threshold

13.2 13.6 14.0

OUT Undervoltage Fault Threshold 1.4 V

= 1.5V, no load 0.5 2.0

OUT Supply Current

= 1.1V, no load 4

10.0

Shutdown Supply Current

(Total of IN, OUT, and SUPB)

= V

OUT

= V

SUPB

= 3V 4 10 µA

Thermal Shutdown Temperature rising, 15°C hysteresis

+160

°C

STEP-UP REGULATOR

FREQ = GND

512 600

768

Operating Frequency

FREQ = IN

1020 1200 1380

kHz

FREQ = GND 91 95 99

Oscillator Maximum Duty Cycle

FREQ = IN 88 92 96

FB Regulation Voltage

1.228 1.24 1.252

FB Fault Trip Level Falling edge

0.96

1.0

1.04

FREQ = GND 43 51 64

Duration to Trigger Fault Condition

FREQ = IN 47 55 65

FB Load Regulation 0 < I

LOAD

< 200mA, transient only -1 %

FB Line Regulation V

= 1.8V to 5.5V

-0.15 -0.08 +0.15

%/V

FB Input Bias Current V

= 1.3V

125

200 nA

FB Transconductance ∆I = 5µA at COMP 75

160

280 µS

FB Voltage Gain FB to COMP

700

V/V

LX On-Resistance I

= 200mA

115

200 mΩ

1 2 3 4 5 6 7 ... 19 20

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Rainbow-electronics MAX8758 Manual de usuario Pagina 2

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