Datasheet

LM2854
SNVS560C –MARCH 2008–REVISED APRIL 2013 www.ti.com
Typical Performance Characteristics (continued)
Unless otherwise specified, the following conditions apply: VIN = PVIN = AVIN = EN = 5.0V, C
IN
is 47 µF 10V X5R ceramic
capacitor, L
O
is from TDK SPM6530T family; T
AMBIENT
= 25°C for efficiency curves, bode plots and waveforms, and T
J
= 25°C
for all others.
LM2854 1 MHz Load Transient Response
LM2854 500 kHz Power Off Characteristic V
IN
= 5.0V, V
OUT
= 3.3V, I
OUT
= 0.5A to 4A to 0.5A step
V
IN
= 5.0V, V
OUT
= 1.8V, I
OUT
= 4A, C
SS
= 220 pF di/dt ≊≊ 4A/µs, C
O
= 100 µF ceramic
Figure 32. Figure 33.
LM2854 500 kHz Switch Node Voltage
(oscilloscope set at infinite persistence) LM2854 500 kHz Startup Waveform
V
IN
= 5.0V, V
OUT
= 2.5V, I
OUT
= 4A V
OUT
= 2.5V, I
OUT
= 0A
Figure 34. Figure 35.
LM2854 500 kHz Pre-Biased Startup Waveform
(oscilloscope set at infinite persistence)
V
OUT
= 2.5V, I
OUT
= 0A, V
PRE-BIAS
= 1.25V
Figure 36.
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