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| LP8728B-Q1 Datasheet, PDF (17/25 Pages) Texas Instruments – LP8728B-Q1 Quad-Output Step-Down DC-DC Converter | |||
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www.ti.com
LP8728B-Q1
SNVSA70 â FEBRUARY 2015
8.2.3 Application Performance Plots
Unless otherwise noted, VIN = 5 V, TA = 25°C, inductor type: TOKO MDT2520-CN1R5M, input and output capacitor type:
MuRata GRM21BR71A106KE51L.
VOUT1
100mV/div
SW_B1
5V/div
Inductor
current
500mA/div
200 s/div
EN_B1
PG_B1
VOUT1
1V/div
C001
100 s/div
C012
Figure 16. Short-Circuit Waveforms
Figure 17. Start-up Delay
VOUT1
50mV/div
VOUT1
50mV/div
IOUT
500mA/div
10 s/div
C013
IOUT from 0 mA to 1A, tRISE = tFALL = 1 µs
Figure 18. Load Transient Response
VIN
1V/div
40 s/div
C014
VIN from 4.5 V To 5.5 V, tRISE = tFALL = 10 µs
Figure 19. Line Transient Response
SW1
SW2
SW3
SW4
80ns/div
C013
Figure 20. Switch Turn-on Phase Shifting
9 Power Supply Recommendations
The LP8728B-Q1 is designed to operate from an input voltage supply range between 4.5 V and 5.5 V. This input
supply must be well regulated and capable to supply the required input current. If the input supply is located far
from the device, additional bulk capacitance may be required in addition to the ceramic bypass capacitors.
Copyright © 2015, Texas Instruments Incorporated
Product Folder Links: LP8728B-Q1
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