88PG8226A1-NFE1C000 Marvell, 88PG8226A1-NFE1C000 Datasheet - Page 28

• Manufacturer Part Number: 88PG8226A1-NFE1C000
• Manufacturer: Marvell

3.3
3.4
Figure 13: UVLO and OVP Waveforms
3.5
Figure 14: Power-On Reset Waveforms
Doc. No. MV-S103563-00 Rev. C
Page 28
Undervoltage Lockout (UVLO)
This feature ensures that the internal MOSFETs have adequate voltage levels to operate properly.
When the input voltage drops below 2.55V (typical), both MOSFETs are off until the input rises
above the upper threshold of 2.65V (typical).
Over Voltage Protection (OVP)
An over voltage comparator guards against transient overshoots, as well as other serious conditions,
that may damage the IC. When the input voltage is rises above 5.7V (typical), both internal
MOSFETs are turned off until the input voltage drops below the lower threshold of 5.6V (typical)
Power-On Reset (POR)
The Power-On Reset (POR) pin is an active-high, open-drain output pin. This output is held low
when the output voltage of the step-down regulator is below the threshold. When the output voltage
is above the threshold, the Power-On Reset pin goes high 40 ms later. Setting the output voltage
greater than 1.35V, the threshold voltage is 0.9% * V
1.32V, the threshold voltage is V
incorporated to prevent nuisance tripping.
V
POR
88PG82XX
Datasheet
V POOD_TH
V OUT
V PORH
V PORL
0 V
BUCK 1 Output
Buck 2 Output
BUCK 1 Output
Buck 2 Output
V
V
Disable
V
Enable
Disable
V
UVLO-HTH
UVLO-LTH
Enable
OVP_HTH
VIN
OVP-LTH
Document Classification: Proprietary Information
OUT
– 130 mV (typical). A built-in 25 µs (t
< t
40 ms
DELAY
OUT (typical)
. Setting the output voltage less than
Undefined
Undefined
> t
DELAY
DELAY
) delay is
Copyright © 2008 Marvell
April 23, 2008, 2.00