SNVA881 November 2019 LP87521-Q1 , LP87522-Q1 , LP87523-Q1 , LP87524-Q1 , LP87525-Q1 , LP87561-Q1 , LP87562-Q1 , LP87563-Q1 , LP87564-Q1 , LP87565-Q1
Figure 11, Figure 12, Figure 13, and Figure 14 summarize the measured phase margins for every phase configuration. The figures include all the measured combinations and are divided into different figures based on the phase configuration. These figures can be used when selecting point of load capacitors for the systems using the LP8756x-Q1 or LP8752x-Q1 PMICs.
To select the required point of load capacitor value which achieves a sufficient phase margin, do the following:
The minimum capacitor configurations that fulfilled the 45 degree phase margin requirement are listed in Table 12
Phases | VIN (V) | VOUT (mV) | CPOL (µF/phase) | Bandwidth (kHz) | Phase margin (deg) |
---|---|---|---|---|---|
1 (LP875x4/3/2-Q1) | 3.3 | 860 | 91 | 101.7 | 48.5 |
1000 | 91 | 104.4 | 50.4 | ||
1800 | 44 | 167.4 | 46.0 | ||
5 | 860 | 91 | 114.6 | 52.0 | |
1000 | 91 | 112.1 | 48.4 | ||
1800 | 44 | 181.4 | 45.4 | ||
3300 | 22 | 296.9 | 45.4 | ||
2 (LP875x3/5-Q1) | 3.3 | 860 | 91 | 95.2 | 50.4 |
1000 | 91 | 99.6 | 50.7 | ||
1800 | 91 | 110.7 | 52.3 | ||
5 | 860 | 91 | 108.3 | 54.0 | |
1000 | 91 | 105.7 | 52.2 | ||
1800 | 44 | 174.0 | 46.9 | ||
3300 | 44 | 194.2 | 50.3 | ||
3 (LP875x2-Q1) | 3.3 | 860 | 91 | 100.5 | 48.3 |
1000 | 91 | 102.6 | 49.8 | ||
1800 | 91 | 111.4 | 51.5 | ||
5 | 860 | 44 | 183.1 | 45.6 | |
1000 | 91 | 112.5 | 51.5 | ||
1800 | 44 | 175.8 | 46.2 | ||
3300 | 44 | 204.6 | 50.1 | ||
4 (LP875x1-Q1) | 3.3 | 860 | 91 | 95.3 | 48.6 |
1000 | 91 | 99.5 | 49.4 | ||
1800 | 91 | 109.7 | 50.8 | ||
5 | 860 | 44 | 194.7 | 48.9 | |
1000 | 44 | 170.7 | 45.7 | ||
1800 | 44 | 169.0 | 47.4 | ||
3300 | 44 | 197.2 | 50.1 |