88PG8227A1-NFE1C000 Marvell, 88PG8227A1-NFE1C000 Datasheet - Page 29

• Manufacturer Part Number: 88PG8227A1-NFE1C000
• Description: MVL88PG8227A1-NFE1C000 1 MHZ DUAL STEP D
• Manufacturer: Marvell

3.6
3.7
Copyright © 2008 Marvell
April 23, 2008, 2.00
Thermal Shutdown
When the junction temperature of the 88PG82XX exceeds 150 °C (typical), the thermal shutdown
circuitry disables the step-down regulator. The step-down switching regulator is enabled when the
junction temperature is decreased to 105 °C (typical).
Adaptive Transient Response
The 88PG82XX device’s Smart Technology allows the step-down switching regulator to quickly
respond to the multiple step loads and maintain stability over a wide range of applications.
shows an example of a second step-load applied while the output voltage of the step-down switching
regulator increased due to the inductive kick from the first step-load.
Condition: V
= 1.2V, I
The worst case overshoot (V
energy
Although the V
capacitor value. The appropriate C
for each specific application.
(Figure
LOAD
IN
= 500 mA to 1.5A.
= 5.0V, R
SOAR
15) can be calculated as:
I
V
LOAD
OUT
cannot be eliminated, its amplitude can be controlled based on the C
Document Classification: Proprietary Information
SVIN
Figure 15: Adaptive Transient
= 10Ω, C
SOAR
) during a full-load to light-load transient due to stored inductor
OUT
V
C
SVIN
SOAR
OUT
value can easily be calculated for the acceptable V
Response
= 0.1 µF, C
=
20
=
Δ
-------------------------------------------- -
2 V
Δ
-------------------------------------------- -
μ
2 C
I
s/DIV
I
•
LOAD MAX
•
LOAD MAX
SOAR
OUT
(
(
PVIN
•
•
V
V
)
)
= 22 µF, L = 3.3 µH, C
2
2
OUT
OUT
•
•
L
L
Functional Description
100mV/DIV
1A/DIV
Doc. No. MV-S103563-00 Rev. C
Thermal Shutdown
OUT
= 22 µF, V
SOAR
OUT
Figure 15
Page 29
level
OUT