TPS84320 Datasheet, PDF (9/31 Pages) Texas Instruments – 4.5-V to 14.5-V Input, 3-A Synchronous Buck, Integrated Power Solution

TPS84320
www.ti.com
SLUSAH7 – SEPTEMBER 2011
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55
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0
TYPICAL CHARACTERISTICS (PVIN = VIN = 5 V)^{(1) (2)}
60
50
40
V_OUT = 3.3 V, f_SW = 630 kHz
V_OUT = 2.5 V, f_SW = 480 kHz
V_OUT = 1.8 V, f_SW = 480 kHz
V_OUT = 1.2 V, f_SW = 480 kHz
V_OUT = 0.8 V, f_SW = 330 kHz
V_OUT = 3.3 V, f_SW = 630 kHz
V_OUT = 2.5 V, f_SW = 480 kHz
V_OUT = 1.8 V, f_SW = 480 kHz
V_OUT = 1.2 V, f_SW = 480 kHz
V_OUT = 1.0 V, f_SW = 330 kHz
V_OUT = 0.8 V, f_SW = 330 kHz
0.5
1
1.5
2
2.5
3
Output Current (A)
G000
Figure 6. Efficiency vs. Output Current
30
20
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0
0.5
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1.5
2
2.5
3
Output Current (A)
G000
Figure 7. Voltage Ripple vs. Output Current
1.2
90
V_OUT = 3.3 V, f_SW = 630 kHz
V_OUT = 2.5 V, f_SW = 480 kHz
80
V_OUT = 1.8 V, f_SW = 480 kHz
0.9
V_OUT = 1.2 V, f_SW = 480 kHz
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V_OUT = 1.0 V, f_SW = 480 kHz
V_OUT = 0.8 V, f_SW = 330 kHz
60
0.6
50
0.3
0
0
0.5
1
1.5
2
2.5
3
Output Current (A)
G000
Figure 8. Power Dissipation vs. Output Current
40
30
All Output Voltages
Natural Convection
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0
0.5
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1.5
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2.5
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Output Current (A)
G000
Figure 9. Safe Operating Area
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120
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−10
−30
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−60
−30
Gain
−90
Phase
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100000
−120
400000
Frequency (Hz)
G000
Figure 10. V_OUT=1.8 V, I_OUT=3 A, C_OUT1= 100 µF ceramic, C_OUT2= 100 µF ceramic, f_SW= 480 kHz
(1) The electrical characteristic data has been developed from actual products tested at 25°C. This data is considered typical for the
converter. Applies to Figure 6, Figure 7, and Figure 8.
(2) The temperature derating curves represent the conditions at which internal components are at or below the manufacturer's maximum
operating temperatures. Derating limits apply to devices soldered directly to a 100 mm × 100 mm double-sided PCB with 1 oz. copper.
Applies to Figure 9.
Copyright © 2011, Texas Instruments Incorporated
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