MAX8739(2006) Ver la hoja de datos (PDF) - Maxim Integrated

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Fabricante

MAX8739
(Rev.:2006)

TFT, LCD, DC-DC Converter with Operational Amplifiers

Maxim Integrated 

TFT, LCD, DC-DC Converter with

Operational Amplifiers

ELECTRICAL CHARACTERISTICS (continued)

(VIN = 2.5V, VSUP = 10V, VSRC = 28V, FREQ = CTL = IN, PGND = AGND = 0, TA = -40°C to +85°C, unless otherwise noted.) (Note 1)

PARAMETER

CONDITIONS

POSITIVE GATE-DRIVER TIMING AND CONTROL SWITCHES

DEL Capacitor Charge Current During startup, VDEL = 1V

DEL Turn-On Threshold

CTL Input-Low Voltage

CTL Input-High Voltage

SRC Input-Voltage Range

VIN = 1.8V to 5.5V

VIN = 1.8V to 2.4V

VIN = 2.4V to 5.5V

SRC Input Current

VDRN = 8V, CTL = AGND, VDEL = 1.5V

VDRN = 8V, CTL = IN, VDEL = 1.5V

DRN Input Current

VDRN = 8V, CTL = AGND, VDEL = 1.5V

SRC-to-COM Switch On-

Resistance

VDEL = 1.5V, CTL = IN

MIN TYP MAX UNITS

4

1.178

1.4

2.0

6

µA

1.302

V

0.6

V

V

28

V

30

µA

180

150

µA

30

Ω

DRN-to-COM Switch On-

Resistance

VDEL = 1.5V, CTL = AGND

60

Ω

Note 1: Specifications to -40°C are guaranteed by design, not production tested.

Typical Operating Characteristics

(Circuit of Figure 1, VIN = 2.5V, VMAIN = 8V, FREQ = IN, TA = +25°C, unless otherwise noted.)

STEP-UP REGULATOR EFFICIENCY

vs. LOAD CURRENT

100

90

VIN = 5V

80

70

60

VIN = 3.3V

50

40

30

20

10

0

1

VIN = 1.8V

fSW = 1.2MHz

VOUT = 8V

L = 3.0µH

10

100

1000

LOAD CURRENT (mA)

STEP-UP REGULATOR EFFICIENCY

vs. LOAD CURRENT

100

90

VIN = 5V

80

70

VIN = 3.3V

60

50

40

VIN = 1.8V

30

20

10

0

1

fSW = 600MHz

VOUT = 8V

L = 6.2µH

10

100

1000

LOAD CURRENT (mA)

STEP-UP REGULATOR

LOAD REGULATION

0.5

0

-0.5

VIN = 1.8V

-1.0

VIN = 5V

-1.5

VIN = 3.3V

-2.0 fSW = 1.2MHz

VOUT = 8V

-2.5

1

10

100

1000

LOAD CURRENT (mA)

6 _______________________________________________________________________________________

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