VOUT (V)

20 mV/DIV

Time (4 µs/DIV)

SW (V)

2 V/DIV

Vin (V)

2.5

3

3.5

4

4.5

5

5.5

0

2

4

6

8

10

12

14

PWM-Bypass Transition

D011

Load Current (mA)

0

20

40

60

80

100

120

140

160

0

10

20

30

40

50

60

70

80

90

100

D003

VIN = 3.4 V

VIN = 3.8 V

VIN = 4.8 V

VIN = 5.5 V

Vin (V)

2.5

3

3.5

4

4.5

5

5.5

0

5

10

15

20

25

D012

Output Current (mA)

0

10

20

30

40

50

60

70

80

45

50

55

60

65

70

75

80

85

90

95

100

D001

VIN = 3.4 V

VIN = 3.8 V

VIN = 4.2 V

VIN = 4.8 V

VIN = 5.5 V

Output Current (A)

0

0.2

0.4

0.6

0.8

1

1.2

1.4

80

85

90

95

100

D002

VIN = 3.4 V

VIN = 3.8 V

VIN = 4.8 V

VIN = 5.5 V

LM3281

www.ti.com

SNVSA38 – NOVEMBER 2014

6.7 Typical Characteristics

All curves are at TA = 25°C and VIN = 3.8 V, unless otherwise specified. CIN, COUT = 2.2 µF, CLOAD2 = 4.7 µF, CLOAD1 = 10 µF,

LSW = 0.47 µH.

Figure 2. ECO Efficiency vs Output Current

Figure 3. PWM Efficiency vs Output Current

Figure 4. Forced PWM Efficiency vs Output Current

Figure 5. No Load ECO Input Current vs VIN

IOUT = 10 mA

Figure 6. No Load Forced PWM Input Current vs VIN

Figure 7. Output Voltage Ripple in ECO Mode

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