Functional Description
Output Voltage—AnyVoltage™ Technology
required to determine the appropriate output voltage. Table 9 provides the number of steps
necessary for each output voltage option. Using a VSET resistor of 165 kΩ requires the current
source to step four times, and a PSET resistor of 31.6 kΩ requires seven steps.
Figure 9: Startup Sequence
Figure 10: V
= 2.5V and P
= -5%
SET
SET
V
2V/DIV
1V/DIV
1V/DIV
1V/DIV
V
P
IN
SET
SET
500mV/DIV
500mV/DIV
20m
V
OUT
V
P
SET
SET
500
2.0 ms/DIV
200 μs/DIV
Table 9: Output Voltage Option Steps
Step
VOUT
(V)
R
(kΩ)
Step
PSET
(%)
R
PSET
(kΩ)
VSET
1
2
3
4
5
6
7
8
9
0
0
1
2
3
4
5
6
7
8
9
0
0
3.3
3.0
2.5
1.8
1.5
1.2
1.0
0.8
475
280
165
97.6
53.6
31.6
18.7
11
+10
+7.5
+5.0
+2.5
-2.5
-5.0
-7.5
-10
475
280
165
97.6
53.6
31.6
18.7
11
The MVPG15x/MVPG16 provides an innovative technique to set the output voltage. During startup it
reads the value of external resistors, which are located outside the regulator’s feedback loop to
program the output voltage. By placing the output voltage programming resistor outside the
regulator’s feedback loop, its tolerance does not affect the accuracy of the output voltage. Normally,
adjustable regulators use 1% resistors to set the output voltage. However, these resistors are
located inside the feedback loop, introducing as much as 2% of initial accuracy error to the output
voltage, resulting in an overall initial accuracy of 3%. Whereas, the MVPG15x/MVPG16 initial
accuracy is 2% for any of the eight output voltages.
The VSET and PSET pins are sensitive to excessive leakage currents and stray capacitance. The
output voltage can potentially be programmed to the lower output voltage if there is contamination,
which introduces excessive leakage current on the VSET and PSET pin, especially for the 3.3V
output or +10%. The parasitic resistance on these nodes must be greater than 3 MΩ and the stray
capacitance must be less than 25 pF; otherwise, a 3.3V output can potentially end up at 3V.
Copyright © 2008 Marvell
April 14, 2008, 2.00
Doc. No. MV-S102809-00 Rev. G
Page 27
Document Classification: Proprietary
MARVELL [ MARVELL TECHNOLOGY GROUP LTD. ]
