Datasheet

VOUT
VIN
LMZ35003
VADJ
AGND PGND
V
OUT
5 V @ 2.5 A
V
IN
8-50 V
PWRGD
RT/CLK
INH/UVLO
STSEL
2.2 F
100 V
52.3kΩ
47 F
6.3 V
174kΩ
31.6kΩ
SS/TR
1100kΩ
47 F
6.3 V
2.2 F
100 V
LMZ35003
www.ti.com SNVS988 –JULY 2013
Figure 30. Typical Schematic
VIN = 8 V to 50 V, VOUT = 5 V
Power-Up Characteristics
When configured as shown in the front page schematic, the LMZ35003 produces a regulated output voltage
following the application of a valid input voltage. During the power-up, internal soft-start circuitry slows the rate
that the output voltage rises, thereby limiting the amount of in-rush current that can be drawn from the input
source. The soft-start circuitry introduces a short time delay from the point that a valid input voltage is
recognized. Figure 31 shows the start-up waveforms for a LMZ35003, operating from a 24-V input and the output
voltage adjusted to 5 V. The waveform were measured with a 2-A constant current load.
Figure 31. Start-Up Sequence
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