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| LM3485MM Datasheet, PDF (6/23 Pages) Texas Instruments – Hysteretic PFET Buck Controller | |||
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LM3485
SNVS178G â JANUARY 2002 â REVISED FEBRUARY 2013
Typical Performance Characteristics (continued)
Unless otherwise specified, TJ = 25°C
Efficiency vs
Load Current
(VOUT = 3.3V, L = 22µH)
100
VIN = 4.5V
Efficiency vs
Load Current
(VOUT = 5.0V, L = 22µH)
100
90
VIN = 12V
80
90
VIN = 12V
VIN = 24V
80
70
VIN = 24V
70
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60
60
50
50
40
10
100
1000
LOAD CURRENT (mA)
10000
Start Up
VIN (10V/div)
(1A/div)
lind@CADJ = 10nF
lind@CADJ = 1nF
VOUT@CADJ = 1nF
(2V/div)
VOUT@CADJ = 10nF
(2V/div)
TIME (100Ps/div)
Discontinuous Mode Operation
(VIN = 12V, VOUT =3.3 V, IOUT = 50mA, L = 22µH)
0.5A
Inductor Current
0A
SW node
10V
Voltage
5V
0V
20mV
Output Ripple Voltage
0mV
-20mV
TIME (5Ps/div)
40
10
100
1000
10000
LOAD CURRENT (mA)
Continuous Mode Operation
(VIN = 12V, VOUT = 3.3 V, IOUT = 500mA, L = 22µH)
1A
0.5A
0A
Inductor Current
10V
5V
0V
SW node Voltage
20mV Output Ripple Voltage
0mV
-20mV
TIME (2Ps/div)
Operating Frequency
vs
Input Voltage
(VOUT = 3.3V, IOUT = 1A, COUT(ESR) = 80mâ¦, Cff = 100pF)
800
600
L=10PH
L=15PH
400
L=22PH
200
0
4
12
20
28
36
INPUT VOLTAGE (V)
6
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Product Folder Links: LM3485
Copyright © 2002â2013, Texas Instruments Incorporated
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