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LM3281 Datasheet(PDF) 7 Page - Texas Instruments

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Part # LM3281
Description  3.3-V, 1.2-A, 6-MHz Miniature Step-Down DC-DC Converter
Download  26 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3281 Datasheet(HTML) 7 Page - Texas Instruments

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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
Copyright © 2014, Texas Instruments Incorporated
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