Datasheet

V = 1 V/div
OUT
Time = 2 ms/div
EN = 2 V/div
V = 5 V/div
IN
SS = 2 V/div
V = 1 V/div
OUT
Time = 2 ms/div
EN = 2 V/div
V = 5 V/div
IN
SS = 2 V/div
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2.9.2 Power Up Relative to EN
The start-up waveform shown in Figure 10 shows start-up is relative to EN rising. The input voltage is
initially applied and allowed to reach 5V while EN is held low by connecting TP4 to GND. When the
connection is removed, the device is enabled and the start-up sequence begins. The output ramps up at
the externally set rate toward the set value of 1.8 V. The input voltage for this plot is 5 V with a 1 Ω load.
Figure 10. TPS5432EVM-116 Start-Up Relative to EN
2.10 Shut Down
2.10.1 Shut Down Relative to V
IN
The shut down waveform shown in Figure 11 shows shut down relative to V
IN
falling. The input voltage is
removed, and when the input falls below the undervoltage lockout threshold, the device turns off and the
output voltage falls. The input voltage for this plot is 5 V with a 1 Ω load.
Figure 11. TPS5432EVM-116 Shut Down Relative to V
IN
9
SLVU674–March 2012 TPS5432EVM-116 3-A, SWIFT™ Regulator Evaluation Module
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