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LM3485MM/NOPB Datasheet(PDF) 8 Page - Texas Instruments

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Part # LM3485MM/NOPB
Description  Hysteretic PFET Buck Controller
PDF  28 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LM3485MM/NOPB Datasheet(HTML) 8 Page - Texas Instruments

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Inductor Current
SW node
Voltage
Output Ripple Voltage
TIME (5Ps/div)
0A
0.5A
0V
5V
10V
0mV
20mV
-20mV
0
200
400
600
800
4
12
20
28
36
INPUT VOLTAGE (V)
L=10PH
L=15PH
L=22PH
(1A/div)
(2V/div)
lind@CADJ = 10nF
lind@CADJ = 1nF
VOUT@CADJ = 10nF
VOUT@CADJ = 1nF
(2V/div)
VIN (10V/div)
TIME (100Ps/div)
0A
0.5A
0V
5V
10V
0mV
20mV
-20mV
1A
Inductor Current
SW node Voltage
Output Ripple Voltage
TIME (2Ps/div)
40
50
60
70
80
90
100
LOAD CURRENT (mA)
10
100
1000
10000
VIN = 12V
VIN = 4.5V
VIN = 24V
40
50
60
70
80
90
100
10
100
1000
10000
LOAD CURRENT (mA)
VIN = 12V
VIN = 24V
LM3485
SNVS178H – JANUARY 2002 – REVISED DECEMBER 2015
www.ti.com
Typical Characteristics (continued)
Unless otherwise specified, TJ = 25°C
VOUT = 5.0 V
L = 22 µH
VOUT = 3.3 V
L = 22 µH
Figure 14. Efficiency vs Load Current
Figure 13. Efficiency vs Load Current
VIN = 12 V
VOUT = 3.3 V
IOUT = 500 mA
L = 22 µH
Figure 16. Continuous Mode Operation
Figure 15. Start Up
VOUT = 3.3 V
IOUT = 1 A
COUT(ESR) = 80 mΩ
VIN = 12 V
VOUT = 3.3 V
IOUT = 50 mA
Cff = 100 pF
L = 22 µH
Figure 18. Operating Frequency vs Input Voltage
Figure 17. Discontinuous Mode Operation
8
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Copyright © 2002–2015, Texas Instruments Incorporated
Product Folder Links: LM3485



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