LTC3778EF datasheet(4/24 Pages) LINER

Part #	LTC3778EF

Description	Wide Operating Range, No RSENSE Step-Down Controller

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Manufacturer	LINER [Linear Technology]

Direct Link	http://www.linear.com

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4

LTC3778

3778f

Efficiency vs Load Current

Efficiency vs Input Voltage

Frequency vs Input Voltage

Load Regulation

ITH Voltage vs Load Current

Current Sense Threshold

vs ITH Voltage

Transient Response

(Discontinuous Mode)

Transient Response

VOUT

50mV/DIV

IL

5A/DIV

20

µs/DIV

3778 G01

LOAD STEP 0A TO 10A

VIN = 15V

VOUT = 2.5V

FCB = 0V

FIGURE 1 CIRCUIT

20

µs/DIV

3778 G02

LOAD STEP 1A TO 10A

VIN = 15V

VOUT = 2.5V

FCB = INTVCC

FIGURE 1 CIRCUIT

Start-Up

50ms/DIV

3778 G19

VIN = 15V

VOUT = 2.5V

RLOAD = 0.125Ω

TYPICAL PERFOR A CE CHARACTERISTICS

VOUT

50mV/DIV

IL

5A/DIV

RUN/SS

2V/DIV

IL

5A/DIV

VOUT

1V/DIV

LOAD CURRENT (A)

0.001

70

80

10

3778 G03

60

50

0.01

0.1

1

100

90

DISCONTINUOUS

MODE

CONTINUOUS

MODE

VIN = 10V

VOUT = 2.5V

EXTVCC = 5V

FIGURE 1 CIRCUIT

INPUT VOLTAGE (V)

0

80

85

90

95

100

510

15

20

3778 G04

25

30

ILOAD = 1A

ILOAD = 10A

FCB = 5V

FIGURE 1 CIRCUIT

INPUT VOLTAGE (V)

5

240

260

25

3778 G05

220

200

10

15

20

300

280

IOUT = 10A

FCB = 0V

FIGURE 1 CIRCUIT

IOUT = 0A

LOAD CURRENT (A)

0

–0.2

–0.1

8

3778 G06

–0.3

–0.4

2

4

6

10

0

FIGURE 1 CIRCUIT

LOAD CURRENT (A)

0

1.0

1.5

3778 G07

0.5

0

5

10

15

2.5

2.0

CONTINUOUS

MODE

DISCONTINUOUS

MODE

FIGURE 1 CIRCUIT

VRNG = 1V

ITH VOLTAGE (V)

0

–200

–100

0

100

200

300

0.5

1.0

1.5

2.0

3778 G08

2.5

3.0

VRNG =

1V

0.7V

0.5V

1.4V

2V

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