88PG8226A1-NFE1C000 Marvell, 88PG8226A1-NFE1C000 Datasheet - Page 26

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

Table 13: AnyVoltage™ Programming Table for 5% Resistors
Doc. No. MV-S103563-00 Rev. C
Page 26
1 0 0k
1 6 0k
2 7 0k
4 7 0k
11 k
1 8 k
3 0 k
5 1 k
.
The VSET and PSET resistors are read once during start-up before the output voltage is turned on.
After the output voltage is turned on, the output voltage can change to different values using serial
programming interface. Otherwise to configure the output to a different voltage, power has to recycle
or the 88PG82XX has to turn OFF and back ON using the shutdown pin.
Figure 11
under voltage lockout (UVLO) upper threshold (UTH), the VSET and PSET pin become active.
Current is first sourced out of PSET pin and then the VSET pin, in exponentially increasing steps.
After each step there is a blanking time before the VSET voltage is compared to an internal 1.2V
reference. If the VSET voltage is below internal reference voltage, the current source proceeds to
the next step. Once the VSET voltage is above the internal reference voltage the sequence stops
and the output voltage (VOUT) is allowed to turn on. The
VSET = 2.5V and PSET = –5% output. The 88PG82XX keeps track of how many steps are required
to determine the appropriate output voltage.
each output voltage option. Using a VSET resistor of 165 kΩ requires the current source to step 4
times, and a PSET resistor of 31.6 kΩ requires 7 steps.
-10.0%
0.720
0.900
1.080
1.350
1.620
2.250
2.700
2.970
11 k
88PG82XX
Datasheet
shows the startup waveforms of the 88PG82XX. Once the input voltage (V
- 7 . 5 %
0.740
0.925
1.110
1.388
1.665
2.313
2.775
3.053
1 8 k
Document Classification: Proprietary Information
- 5 . 0 %
0.760
0.950
1.140
1.425
1.710
2.375
2.850
3.135
3 0k
- 2 . 5 %
0.780
0.975
1.170
1.463
1.755
2.438
2.925
3.218
5 1 k
Table 10
P SE T
G N D
0.800
1.000
1.200
1.500
1.800
2.500
3.000
3.300
0 %
provides the number of steps necessary for
Figure 12
2 . 5%
1 0 0 k
0.820
1.025
1.230
1.538
1.845
2.563
3.075
3.383
shows the VSET waveform for
5 . 0 %
1 6 0 k
0.840
1.050
1.260
1.575
1.890
2.625
3.150
3.465
7 . 5 %
2 7 0 k
0.860
1.075
1.290
1.613
1.935
2.688
3.225
3.548
Copyright © 2008 Marvell
IN
April 23, 2008, 2.00
) is above the
1 0 .0 %
4 7 0 k
0.880
1.100
1.320
1.650
1.980
2.750
3.300
3.630