0

1

2

3

4

-75

-50

-25

0

25

50

75

100 125

SUPPLY CURRENT vs. TEMPERATURE

TEMPERATURE (°C)

CIRCUIT OF FIGURE 2b

BOOTSTRAPPED MODE

ENTIRE

CIRCUIT

SCHOTTKY DIODE

LEAKAGE EXCLUDED

0

0.2

0.4

0.6

0.8

2

4

6

8

10

12

SUPPLY CURRENT vs. SUPPLY VOLTAGE

SUPPLY VOLTAGE (V)

NON-BOOTSTRAPPED

CIRCUIT OF FIGURE 2c

BOOTSTRAPPED

CIRCUIT OF

FIGURE 2b

0

100

150

200

250

50

2

4

6

8

10

12

EXT RISE/FALL TIME vs. SUPPLY VOLTAGE

V+ (V)

100

50

0.001

0.01

0.1

1

MAX772

EFFICIENCY vs. OUTPUT CURRENT

(BOOTSTRAPPED)

60

OUTPUT CURRENT (A)

70

80

90

MAX772 SUBSTITUTED FOR MAX771

50

60

70

80

90

100

0.001

0.01

1

MAX771

EFFICIENCY vs. OUTPUT CURRENT

(BOOTSTRAPPED)

OUTPUT CURRENT (A)

0.1

CIRCUIT OF

FIGURE 2b

100

50

0.001

0.01

0.1

1

MAX770

EFFICIENCY vs. OUTPUT CURRENT

(BOOTSTRAPPED)

60

OUTPUT CURRENT (A)

70

80

90

CIRCUIT OF

FIGURE 2a

5V/12V/15V or Adjustable, High-Efficiency,

4

_______________________________________________________________________________________

__________________________________________Typical Operating Characteristics

70

80

90

100

0.001

0.01

0.1

10

1

MAX771

EFFICIENCY vs. OUTPUT CURRENT

(NON-BOOTSTRAPPED)

OUTPUT CURRENT (A)

CIRCUIT OF

FIGURE 2c

0

100

200

300

400

500

600

700

1.0

MAX770

LOAD CURRENT vs.

MINIMUM START-UP INPUT VOLTAGE

MINIMUM START-UP INPUT VOLTAGE (V)

3.0

1.5

2.5

3.5

2.0

ABOVE 3.4V,

THE CIRCUIT

STARTS UP

UNDER

MAXIMUM

LOAD

CONDITIONS

CIRCUIT OF

FIGURE 2a

0

100

200

300

400

500

2.0

MAX771

LOAD CURRENT vs.

MINIMUM START-UP INPUT VOLTAGE

MINIMUM START-UP INPUT VOLTAGE (V)

4.0

2.5

3.5

3.0

ABOVE 3.5V

THE CIRCUIT

STARTS UP

UNDER

MAXIMUM

LOAD

CONDITIONS

CIRCUIT OF

FIGURE 2b