LM3489_15 Datasheet, PDF (6/25 Pages) Texas Instruments – Hysteretic PFET Buck Controller With Enable Pin

LM3489
LM3489-Q1
SNVS443B – MAY 2006 – REVISED FEBRUARY 2013
Typical Performance Characteristics (continued)
All curves taken at VIN = 12V with configuration in Design Information. T_J = 25°C, unless otherwise specified.
Current Limit One Shot OFF Time vs Temperature
V_IN - V_PGATE vs V_IN
10
6
9.5
V_IN = 12V
V_IN = 4.5V
9
V_IN = 35V
V_IN = 24V
8.5
5.5
125°C
5
25°C
4.5
-40°C
4
3.5
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8
-40 -10 20 50 80 110 140
JUNCTION TEMPERATURE, T_J (°C)
Figure 8.
Minimum ON Time vs Temperature (Normal Operation)
160
3
0
10
20
30
40
V_IN (V)
Figure 9.
Minimum ON Time vs Temperature (Current Limit)
300
140
V_IN = 4.5V
120
V_IN = 12V
100
V_IN = 24V
80
60
250
V_IN = 24V
200
V_IN = 4.5V
150
V_IN = 12V
40
-40 -10 20 50 80 110 140
JUNCTION TEMPERATURE, T_J (°C)
Figure 10.
Operating ON Time vs Load Current
10
8
6
V_IN = 6V
4
V_IN = 24V
2
V_IN = 12V
0
0
0.2 0.4 0.6 0.8
1
LOAD CURRENT (A)
Figure 12.
100
-40 -10 20 50 80 110 140
JUNCTION TEMPERATURE, T_J (^oC)
Figure 11.
Operating Frequency vs Input Voltage
600
V_OUT = 3.3V
500
I_OUT = 500 mA
L = 10 PH
C_ff = 100 pF
400
300
L = 15 PH
200
L = 22 PH
100
0
0
10
20
30
40
V_IN (V)
Figure 13.
6
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