Rainbow-electronics MAX5098A Manual de usuario descargar pdf (Pagina 6)

MAX5098A

Dual, 2.2MHz, Automotive Buck or Boost

Converter with 80V Load-Dump Protection

6 _______________________________________________________________________________________

Typical Operating Characteristics

(See the

Typical Application Circuit

, unless otherwise noted. V+ = V

IN_HIGH

= 14V, unless otherwise noted. V+ = V

IN_HIGH

means

that N1 is shorted externally.)

OUTPUT1 EFFICIENCY

vs. LOAD CURRENT

MAX5098A toc01

LOAD (A)

OUTPUT1 EFFICIENCY (%)

1.81.61.2 1.40.6 0.8 1.00.4

10

20

30

40

50

60

70

80

90

100

0

0.2 2.0

V

IN

= 8V

V

IN

= 14V

V

IN

= 16V

V

OUT

= 5V

f

SW

= 1.85MHz

OUTPUT2 EFFICIENCY

vs. LOAD CURRENT

MAX5098A toc02

LOAD (A)

OUTPUT2 EFFICIENCY (%)

0.90.80.6 0.70.4 0.50.30.2 1.0

10

20

30

40

50

60

70

80

90

100

0

V

IN

= 16V

V

IN

= 8V

V

IN

= 14V

V

IN

= 5.5V

V

IN

= 4.5V

V

OUT

= 3.3V

f

SW

= 1.85MHz

OUTPUT1 EFFICIENCY

vs. LOAD CURRENT

MAX5098A toc03

LOAD (A)

OUTPUT1 EFFICIENCY (%)

1.81.61.2 1.40.6 0.8 1.00.4

10

20

30

40

50

60

70

80

90

100

0

0.2 2.0

V

IN

= 8V

V

IN

= 14V V

IN

= 16V

V

OUT

= 5V

f

SW

= 300kHz

L1 = 18

μ

H

OUTPUT2 EFFICIENCY

vs. LOAD CURRENT

MAX5098A toc04

LOAD (A)

OUTPUT2 EFFICIENCY (%)

0.90.80.6 0.70.4 0.50.30.2 1.0

10

20

30

40

50

60

70

80

90

100

0

V

IN

= 16V

V

IN

= 8V

V

IN

= 14V

V

IN

= 5.5V

V

IN

= 4.5V

V

OUT

= 3.3V

f

SW

= 300kHz

L2 = 27

μ

H

OUTPUT1 VOLTAGE

vs. LOAD CURRENT

MAX5098A toc05

LOAD (A)

OUTPUT1 VOLTAGE (V)

1.81.61.41.21.00.80.60.4

4.92

4.94

4.96

4.98

5.00

4.90

0.2 2.0

V

IN

= 8V

V

IN

= 14V

V

IN

= 16V

V

OUT

= 5V

f

SW

= 1.85MHz

OUTPUT2 VOLTAGE

vs. LOAD CURRENT

MAX5098A toc06

LOAD (A)

OUTPUT2 VOLTAGE (V)

0.90.80.70.60.50.40.3

3.22

3.24

3.26

3.28

3.30

3.20

0.2 1.0

V

IN

= 5.5V

V

IN

= 16V

V

IN

= 14V

V

OUT

= 3.3V

f

SW

= 1.85MHz

V

L

OUTPUT VOLTAGE

vs. CONVERTER SWITCHING FREQUENCY

MAX5098A toc07

CONVERTER SWITCHING FREQUENCY (kHz)

V

L

OUTPUT VOLTAGE (V)

17001200700

4.2

4.4

4.6

4.8

5.0

5.2

5.4

4.0

200 2200

V

IN

= 4.5V

V

IN

= 5.5V

V

IN

= 8V

V

IN

= 19V

V

IN

= 5V

BOTH CONVERTERS SWITCHING

FSEL_1 = V

L

EACH CONVERTER SWITCHING

FREQUENCY vs. R

OSC

MAX5098A toc08

R

OSC

(kΩ)

SWITCHING FREQUENCY (MHz)

604020

1

0

80

10

0.1

CONVERTER 1, CONVERTER 2

CONVERTER 1

FSEL_1 = V

L

,

FSEL_1 = GND,

EACH CONVERTER SWITCHING

FREQUENCY vs. TEMPERATURE

MAX5098A toc09

TEMPERATURE (°C)

SWITCHING FREQUENCY (MHz)

-5 30 65 100

1

10

0.1

-40 135

0.3MHz

0.6MHz

1.25MHz

1.85MHz

2.2MHz

FSEL_1 = V

L

1 2 3 4 5 6 7 8 9 10 11 ... 27 28

MAX5098A 1

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