Datasheet

500 mA/div
2 V/div
1 V/div
I Ramp
O
V Ramp
O
V (3.3V)
IN
100 mV/div
20 mV/div
200 ma/div
V
IN
Output Current, I
O
V
OUT
www.ti.com Thermal Guidelines and Layout Recommendations
Figure 1. Turn-on Sequence: Green – V
IN
(3.3 V), Blue – I
O
Ramp, Yellow – V
O
Ramp
4.2 Output Load Transient
Figure 2 shows the load transient response (V
OUT
, yellow) for a load step transient from 100 mA to
500 mA (output current, I
O
, blue). V
IN
is set at 3.3 V.
Figure 2. Load step and Transient Response: Yellow – V
OUT
, Green – V
IN
, Blue – Output Current, I
O
5 Thermal Guidelines and Layout Recommendations
Thermal management is a key component of design of any power converter and is especially important
when the power dissipation in the LDO is high. Use the following formula to approximate the maximum
power dissipation for the particular ambient temperature:
T
J
= T
A
+ P
D
× θ
JA
(1)
3
SLVU449B–March 2011–Revised May 2011 TLV1117LVxxEVM-714 Evaluation Module
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