LM3678 datasheet(5/19 Pages) TI

Part #	LM3678

Description	High-Performance Miniature 1.5-A Step-Down DC-DC Converter for Handheld Applications

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Manufacturer	TI [Texas Instruments]

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TEMPERATURE (°C)

2.50

2.45

2.40

2.35

2.30

2.25

2.20

2.15

2.10

2.05

2.00

1.95

1.90

-30

-10

10

30

50

70

90

VIN = 2.5V

VIN = 5.5V

VIN = 3.6V

LOAD (A)

90

80

70

60

50

40

30

20

10

0

0.0001 0.0010

0.010

0.100

1.000

10.000

VIN = 3.6V

VIN = 4.5V

VIN = 5.5V

VIN = 2.5V, 2.7V

TEMPERATURE (°C)

150

140

130

120

110

100

90

80

70

-30

-10

10

30

50

70

90

VIN = 2.5V

VIN = 5.5V

VIN = 3.6V

TEMPERATURE (°C)

220

200

180

160

140

120

100

80

-30

-10

10

30

50

70

90

VIN = 2.5V

VIN = 5.5V

VIN = 3.6V

TEMPERATURE (°C)

500

475

450

425

400

375

350

325

300

275

250

-30

-10

10

30

50

70

90

VIN = 2.5V

VIN = 5.5V

VIN = 3.6V

TEMPERATURE (°C)

3.50

3.45

3.40

3.35

3.30

3.25

3.20

3.15

3.10

3.05

3.00

-30

-10

10

30

50

70

90

VIN = 2.5V

VIN = 5.5V

VIN = 3.6V

LM3678

www.ti.com

SNVS464C – APRIL 2008 – REVISED MAY 2013

Typical Performance Characteristics

LM3678SD, Circuit of Figure 1, VIN= 3.6V, VOUT= 1.2V, CIN = 10µF, COUT = 22µF, and TA= 25°C, unless otherwise noted.

Quiescent Supply Current vs. Temperature

Switching Frequency vs. Temperature

Figure 6.

Figure 7.

NFET_ RDSON vs. Temperature

PFET_RDSON vs. Temperature

Figure 8.

Figure 9.

ILIMIT vs. Temperature (Open Loop)

Efficiency PWM Mode vs. ILOAD (0.8V)

Figure 10.

Figure 11.

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