Step-Down Controllers with Prebias Startup,

Lossless Sensing, Synchronization, and OVP

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7

EFFICIENCY vs. LOAD CURRENT

WITH 12V INPUT

LOAD CURRENT (A)

10

1

10

20

30

40

50

60

70

80

90

100

0

0.1

100

EFFICIENCY vs. LOAD CURRENT

WITH 3.3V INPUT

LOAD CURRENT (A)

10

1

10

20

30

40

50

60

70

80

90

100

0

0.1

100

LOAD REGULATION WITH 12V INPUT

LOAD CURRENT (A)

12

9

6

3

2.46

2.47

2.48

2.49

2.50

2.51

2.52

2.53

2.54

2.55

2.45

015

LINE REGULATION WITH 12V INPUT

AND 2.5V OUTPUT

INPUT VOLTAGE (V)

12.6

12.0

11.4

2.492

2.494

2.496

2.498

2.500

2.502

2.504

2.506

2.508

2.510

2.490

10.8

13.2

NO LOAD

15A LOAD

LINE REGULATION

3.0V TO 3.6V INPUT

INPUT VOLTAGE (V)

3.5

3.4

3.3

3.2

3.1

2.44

2.46

2.48

2.50

2.52

2.54

2.42

3.0

3.6

NO LOAD

15A LOAD

15A LOAD

OSCILLATOR FREQUENCY

vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

5.0

4.5

4.0

3.5

420

440

460

480

500

520

540

560

580

600

400

3.0

5.5

°C

°C

°C

R6 = 53.6k

Ω

OSCILLATOR FREQUENCY

vs. INPUT VOLTAGE

INPUT VOLTAGE (V)

11.5

9.5

7.5

520

540

560

580

600

620

640

660

680

700

500

5.5

13.5

R6 = 42.2k

Ω

°C

°C

°C

Typical Operating Characteristics