MAX1542-MAX1543 datasheet(6/20 Pages) MAXIM

Part #	MAX1542-MAX1543

Description	TFT LCD DC-to-DC Converter with Operational Amplifiers

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Manufacturer	MAXIM [Maxim Integrated Products]

Direct Link	https://www.maximintegrated.com/en.html

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TFT LCD DC-to-DC Converter with

Operational Amplifiers

6

_______________________________________________________________________________________

Typical Operating Characteristics

(VIN = 3.3V, VMAIN = 8V, fOSC = 1.2MHz, TA = +25°C, unless otherwise noted.)

50

1

1000

100

STEP-UP REGULATOR EFFICIENCY

vs. LOAD CURRENT (VMAIN = 8V)

65

55

85

75

95

70

60

90

80

LOAD CURRENT (mA)

10

MAX1543

fOSC = 1.2MHz

L = 4.7

µH

VIN = 3.3V

VIN = 2.7V

VIN = 5V

50

1

1000

100

10

STEP-UP REGULATOR EFFICIENCY

vs. LOAD CURRENT (VMAIN = 8V)

65

55

85

75

95

70

60

90

80

LOAD CURRENT (mA)

MAX1543

fOSC = 640kHz

L = 10

µH

VIN = 3.3V

VIN = 2.7V

VIN = 5V

STEP-UP REGULATOR OUTPUT VOLTAGE

vs. LOAD CURRENT (VMAIN = 8V)

LOAD CURRENT (mA)

10

100

7.6

7.7

7.8

7.9

8.0

8.1

7.5

1

1000

VIN = 3.3V

fOSC = 1.2MHz

VIN (V)

5.0

4.5

4.0

3.5

3.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0

2.5

5.5

STEP-UP REGULATOR SUPPLY CURRENT

vs. SUPPLY VOLTAGE

NO LOAD

fOSC = 1.2MHz

R1 = 75k

Ω

R2 = 13.7k

Ω

SUP DISCONNECTED

CURRENT INTO INDUCTOR

CURRENT INTO IN PIN

STEP-UP REGULATOR SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (

°C)

60

35

10

-15

0.4

0.8

1.2

1.6

2.0

0

-40

85

NO LOAD

VIN = 3.3V

fOSC = 1.2MHz

R1 = 75k

Ω

R2 = 13.7k

Ω

SUP DISCONNECTED

CURRENT INTO INDUCTOR

CURRENT INTO IN PIN

VIN (V)

5.0

4.5

4.0

3.5

3.0

600

800

1000

1200

1400

400

2.5

5.5

SWITCHING FREQUENCY

vs. INPUT VOLTAGE

MAX1543

IMAIN = 200mA

FREQ = IN

FREQ = AGND

SUP SUPPLY CURRENT

vs. SUP VOLTAGE

VSUP (V)

12.0

10.5

9.0

7.5

6.0

1.00

1.25

1.50

1.75

0.75

4.5

13.5

NO LOAD

BUFFER CONFIGURATION

POS_ = VSUP/2

SUP SUPPLY CURRENT

vs. TEMPERATURE

TEMPERATURE (

°C)

60

35

10

-15

1.2

1.6

2.0

0.8

-40

85

NO LOAD

BUFFER CONFIGURATION

VPOS = VSUP/2

VSUP = 13V

VSUP = 8V

VSUP = 5V

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