LM3489_15 Datasheet, PDF (7/25 Pages) Texas Instruments – Hysteretic PFET Buck Controller With Enable Pin

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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.
Efficiency vs Load Current
(V_OUT = 3.3V, L = 22µH)
100
V_IN = 4.5V
90 _{VIN = 12V}
V_OUT Regulation vs Load Current
(V_OUT = 3.3V, L = 22µH)
3.0
2.0
80
V_IN = 24V
70
60
50
1.0
V_IN = 24V
0.0
V_IN = 4.5V
-1.0
V_IN = 12V
-2.0
40
0.0 0.2 0.4 0.6 0.8 1.0 1.2
OUTPUT CURRENT (A)
Figure 14.
Efficiency vs Load Current (V_OUT = 5V, L = 22µH)
100
V_IN = 12V
90
V_IN = 24V
80
-3.0
0.0 0.2 0.4 0.6 0.8 1.0 1.2
OUTPUT CURRENT (A)
Figure 15.
V_OUT Regulation vs Load Current (V_OUT = 5V, L = 22µH)
3.0
2.0
1.0 ^{VIN = 24V}
70
0.0
60
50
L = 22 PH
R1 = 60.7k
R2 = 20k
40
0.0 0.2 0.4 0.6 0.8 1.0 1.2
OUTPUT CURRENT (A)
Figure 16.
Power Up (No Load, C_ADJ = 1nF)
-1.0
V_IN = 12V
-2.0
L = 22 PH
R1 = 60.7k
R2 = 20k
-3.0
0.0 0.2 0.4 0.6 0.8 1.0 1.2
OUTPUT CURRENT (A)
Figure 17.
Continuous Mode Operation
(V_IN = 12V, V_OUT = 3.3 V, I_OUT = 500mA)
V_OUT RIPPLE
(50 mVac/Div)
Switch Node Voltage, V_D1 (10V/Div)
I_L (1A/Div)
Figure 18.
TIME (2 Ps/DIV)
Figure 19.
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