LTC1773

3

1773fb

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: The LTC1773 is guaranteed to meet performance specifications from

0

°C to 70°C. Specifications over the –40°C to 85°C operating temperature

range are assured by design, characterization and correlation with statistical

process controls.

Note 5: Dynamic supply current is higher due to the gate charge being

delivered at the switching frequency.

Note 6: Rise and fall times are measured using 10% and 90% levels.

ELECTRICAL CHARACTERISTICS

TYPICAL PERFOR A CE CHARACTERISTICS

Efficiency vs Input Voltage

Efficiency vs Load Current

Efficiency vs Load Current

Load Regulation

vs Load Current

Input and Shutdown Currents

vs Input Voltage

OUTPUT CURRENT (mA)

1

1773 G01

10

100

1000

5000

100

90

80

70

60

50

FORCED CONTINUOUS

SEE FIGURE 1

Burst Mode

OPERATION

SYNC(750kHz)

INPUT VOLTAGE (V)

100

95

90

85

80

75

24

6

8

1773 G03

10

SEE FIGURE 1

LOAD CURRENT (mA)

0

400

350

300

250

200

150

100

50

0

2000

1773 G05

500

1000

1500

2500

Si9801DY

INPUT VOLTAGE (V)

2

10

1773 G06

4

6

8

500

450

400

350

300

250

200

150

100

50

0

SYNC TO 750kHz

Burst Mode OPERATION

SHUTDOWN

Si9801DY

L = CDRH6D28-3RO

OUTPUT CURRENT (mA)

1

100

90

80

70

60

50

1773 G02

10

100

1000

SEE FIGURE 1

10,000

LOAD CURRENT (A)

0

0

– 0.05

– 0.10

– 0.15

– 0.20

– 0.25

– 0.30

1.5

2.5

1773 G16

0.5

1.0

2.0

3.0

3.5

SEE FIGURE 1