Voltage Regulators
This page describes the performance of different passive components with the voltage regulators on Sulu and Spock PCBs.
Introduction
The Spock and Sulu PCBs have voltage regulators so that a 3 V battery can power SCuM, which takes up to 2 V. The voltage regulators have been noisier and less efficient than expected.
Component selection
Friendly name | Model number | Designator | Notes | Datasheet |
spock 10 uF cap | GRJ155R60J106ME11D | C_1.1_IN1, C_1.1_OUT1, C_1.8_IN2 , C_1.8_OUT2 |
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old 10 uF cap | CL05A106MP8NUB8 | C_1.1_IN1, C_1.8_IN2 |
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new 10 uF cap | GRM155R60J106ME15D | C_1.1_IN1, C_1.1_OUT1, C_1.8_IN2 , C_1.8_OUT2 | Recommended on datasheet |
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100 uF cap | GRM21BR60E107ME15L | C_1.1_OUT1, C_1.8_OUT2 |
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old inductor | MLZ1005M2R2WT000 | L1, L2 |
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new inductor | 74438343022 | L1, L2 | Recommended on datasheet | |
1.1V DC-DC | S-85S1AB11-I6T1U | U3 |
| https://www.ablic.com/en/doc/datasheet/switching_regulator/S85S1A_E.pdf |
1.8V DC-DC | S-85S1AB18-I6T1U | U2 |
| https://www.ablic.com/en/doc/datasheet/switching_regulator/S85S1A_E.pdf |
Note that the 1.1V DC-DC converters were missing so 1.0V DC-DC converters were used as a substitute.
Boards
Friendly name | Designator | Board | L1, L2 | C_1.x_INy | C_1.x_OUTy | VBAT converter | VDDD converter |
Recommended components | DC1 | Sulu v1.0 | 74438343022 | GRM155R60J106ME15D | GRM155R60J106ME15D | S-85S1AB18-I6T1U | S-85S1AB10-I6T1U |
Spock components | DC2 | Sulu v1.0 | MLZ1005M2R2WT000 | GRJ155R60J106ME11D | GRJ155R60J106ME11D | S-85S1AB18-I6T1U | S-85S1AB10-I6T1U |
| L6/L7 | Sulu v1.0 | MLZ1005M2R2WT000 | CL05A106MP8NUB8 | GRM21BR60E107ME15L | S-85S1AB18-I6T1U | S-85S1AB11-I6T1U |
Figures
Waveforms
DC1
DC2
L6
I-V measurements
Board | V_ext (V) | R_load (k Ohm) | R_ext (k Ohm) | I_ext (mA) | V_bat (V) | I_bat (mA) | P_ext (mW) | P_bat (mW) | P_bat/P_ext (%) |
DC1 | 3 | 11.94 | 0 | 1.389 | 1.791 | 0.1506 | 4.167 | 0.269725 | 6% |
DC1 | 3 | 5.25 | 0 | 1.502 | 1.765 | 0.3365 | 4.506 | 0.593923 | 13% |
DC1 | 3 | 1.194 | 0 | 2.304 | 1.783 | 1.494 | 6.912 | 2.663802 | 39% |
DC2 | 3 | 11.94 | 0 | 1.781 | 1.799 | 0.1509 | 5.343 | 0.271469 | 5% |
DC2 | 3 | 5.25 | 0 | 1.951 | 1.8 | 0.3431 | 5.853 | 0.61758 | 11% |
DC2 | 3 | 1.194 | 0 | 2.95 | 1.779 | 1.483 | 8.850 | 2.638257 | 30% |
L6 | 3 | 11.94 | 0 | 1.88 | 1.757 | 0.147 | 5.640 | 0.258279 | 5% |
L6 | 3 | 5.25 | 0 | 2.1 | 1.821 | 0.347 | 6.300 | 0.631887 | 10% |
L6 | 3 | 1.194 | 0 | 3.15 | 1.814 | 1.52 | 9.450 | 2.75728 | 29% |