Vin (V)

3.26 3.28 3.3 3.32 3.34 3.36 3.38 3.4 3.42 3.44 3.46 3.48

3.04

3.08

3.12

3.16

3.2

3.24

3.28

3.32

3.36

3.4

3.44

3.48

+3% Limit

-3% Limit

D006

IOUT = 300 mA

IOUT = 500 mA

IOUT = 600 mA

IOUT = 700 mA

IOUT = 800 mA

IOUT = 1000 mA

IOUT = 1200 mA

Vin (V)

3.26 3.28 3.3 3.32 3.34 3.36 3.38 3.4 3.42 3.44 3.46 3.48

3.04

3.08

3.12

3.16

3.2

3.24

3.28

3.32

3.36

3.4

3.44

3.48

+3% Limit

-3% Limit

D007

IOUT = 300 mA

IOUT = 500 mA

IOUT = 600 mA

IOUT = 700 mA

IOUT = 800 mA

IOUT = 1 A

IOUT = 1.2 A

Load (mA)

0

5

10

15

20

25

30

35

40

45

50

55

60

0

10

20

30

40

50

60

70

80

90

100

110

120

130

D004

VIN = 3.4 V

VIN = 3.8 V

VIN = 4.8 V

Vin (V)

3.5

4

4.5

5

5.5

5.5

5.6

5.7

5.8

5.9

6

6.1

6.2

6.3

6.4

6.5

D005

VOUT (V)

1 mV/DIV

SW (V)

2 V/DIV

Time (40 ns/DIV)

VOUT (V)

1 mV/DIV

SW (V)

2 V/DIV

Time (40 ns/DIV)

LM3281

SNVSA38 – NOVEMBER 2014

www.ti.com

Typical Characteristics (continued)

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.

IOUT = 100 mA

IOUT = 10 mA

Figure 8. Output Voltage Ripple in PWM Mode

Figure 9. Output Voltage Ripple in Forced PWM Mode

Figure 10. ECO Burst Frequency vs Output Current

Figure 11. PWM Switching Frequency vs VIN

Figure 12. PWM-to-Analog Bypass Transition, Falling VIN

Figure 13. Analog Bypass-to-PWM Transition, Rising VIN

8

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