LP87524B-Q1 Datasheet, PDF (60/71 Pages) Texas Instruments – 4-A + 2.5-A + Two 1.5-A Buck Converters with Integrated Switches

LP87524B-Q1
SNVSAW2 – APRIL 2017
1.02
1.016
1.012
1.008
1.004
1
0.996
0.992
0.988
0.984
0.98
-40 -20 0 20 40 60 80
Temperature (°C)
Load = 1 A (PWM) and 0.1 A (PFM)
1PH, PWM
1PH, PFM
100 120 140
D036
Figure 28. Output Voltage vs Temperature
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V(EN1)(500mV/div)
VOUT(200mV/div)
V(SW)(2V/div)
I_OUT = 0 A
Time (100 µs/div)
Figure 29. Start-Up With EN1, Forced PWM
V(EN1)(500mV/div)
VOUT(200mV/div)
ILOAD(500mA/div)
V(SW)(2V/div)
R_LOAD = 1 Ω
Time (100 µs/div)
Figure 30. Start-Up With EN1, Forced PWM
(1-Phase Output)
VOUT(10mV/div)
VOUT(200mV/div)
V(EN1)(500m/div)
ILOAD(500mA/div)
V(SW)(2V/div)
R_LOAD = 1 Ω
Time (100 µs/div)
Figure 31. Shutdown With EN1, Forced PWM
(1-Phase Output)
VOUT(10mV/div)
V(SW_B0)(2V/div)
I_OUT = 10 mA
Time (40 µs/div)
Figure 32. Output Voltage Ripple, PFM Mode
(1-Phase Output)
60
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V(SW_B0)(1V/div)
I_OUT = 200 mA
Time (100 ns/div)
Figure 33. Output Voltage Ripple, Forced-PWM Mode
(1-Phase Output)
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