MPSafeTM Power Subsystem Solution for Mobileye’s EyeQ6L Platform
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1 Overview
1.1 Description
The EVME6L_00A is an MPSafeTM power subsystem solution for powering Mobileye’s EyeQ6L platform, enabling autonomous driving in automobiles. The solution provides excellent power delivery with high-efficiency switching regulators.
The control architectures of these power converters also allow the system to achieve fast and excellent transient response to load transients without increasing the output capacitance. In addition, the MPQ79500FS voltage monitor and MPQ79700FS power sequencer allow the system to achieve a functional safety grade of ASIL-D.
1.2 Features
- 9 Output Rails:
- 8 Point-of-Load (PoL) Converters
- 1 Core Rail Provided by 1 Synchronous Buck Converter
- 12 Voltage Rails Monitored with Precision Accuracy for Over-
Voltage (OV) Faults, Under-Voltage (UV) Faults, and Power
Sequence Recording - 12 Sequencer Channels with Fault Detection
- 32kHz Crystal Oscillator Driver
- Real-Time Clock (RTC)
- Windowed Watchdog
- Pre-Regulator up to 20A
Figure 1: EVME6L_00A Reference Design
1.3 Applications
- Autonomous Driving Platforms
- Automotive Advanced Driver Assistance (ADAS)
Platforms
2 Reference Design
2.1 Block Diagram
MPS provides the EVME6L_00A evaluation board as a tool to evaluate and design the power supply for the EyeQ6L system-on-chip (SoC). Figure 2 shows the block diagram of the evaluation board.
The board includes two low-current voltage regulators (the MPQ5075A and MPQ3414B), one PMIC with 6 low-current outputs (the MPQ7920), and one high-current voltage regulator (the MPQ2286). The MPQ2286 provides fixed-frequency zero-delay pulse-width modulation (ZDP) control for fast and excellent transient response. The MPQ7920 provides constant-on-time (COT) control architecture, which also allows the system to achieve a fast transient response. Lastly, the system includes one MPQ79700FS power sequencer and two MPQ79500FS voltage monitors to evaluate the functional safety capabilities of these products.
Figure 2: Functional Block Diagram (1) (2)
Notes:
1) The MPQ79700FS is optional. The system can use an application microcontroller (MCU) to enable the regulators.
2) The MPQ5075A and MPQ3414B are optional for user external needs (e.g. CAN and MIPI).
2.2 Rail Assignment
Table 1 shows the comprehensive rail assignments for the system
Table 1: Rail Assignment
| DC/DC Converter | Device | Output (V) | Output (A) | MPQ79500 Channel | MPQ79700 | |||
| EN1 | EN2 | EN3 | EN4 | |||||
| HCVR1 | MPQ2286 | 0.75 | 11 | 0x30 (Channel 2) | x | |||
| LDO1 | MPQ7920 | 1.8 | 0.3 | 0x33 (Channel 4) | x | |||
| LDO0 | MPQ7920 | 0.75 | 0.25 | 0x33 (Channel 6) | x | |||
| SW6 | MPQ3414B | 5 | 0.3 | 0x30 (Channel 1) | x | |||
| SW5 | MPQ5075A | 3.3 | 3 | 0x30 (Channel 3) | x | |||
| SW4 | MPQ7920 | 1.25 | 2 | 0.33 (Channel 3) | x | |||
| SW3 | MPQ7920 | 0.6 | 2 | 0x33 (Channel 1) | x | |||
| SW2 | MPQ7920 | 1.8 | 1.5 | 0x33 (Channel 5) | x | |||
| SW1 | MPQ7920 | 1.1 | 2 | 0x33 (Channel 2) | x |
2.3 Related Solutions
This reference design is based on the following MPS solutions:
Table 2: Related Solutions
| MPS Integrated Circuit | Description |
| MPQ79500FS-AEC1 | 6-channel, ASIL-D voltage monitor |
| MPQ79700FS-AEC1 | Automotive functional safety power sequencer |
| MPQ5075A-AEC1 | 5.5V, 5A, low on resistance (RDS(ON)) load switch with configurable current limit |
| MPQ2286-AEC1 | MPSafeTM QM, 6V, 12A, configurable high-frequency buck regulator |
| MPQ7920-AEC1 | 5V PMIC with four buck converters, 5 LDOs, and flexible system settings via I2C and MTP |
| MPQ3414B-5-AEC1 | 1.5A, 2.2MHz, 5V VOUT, 52µA IQ, synchronous step-up converter with output disconnect |
| MPQ4372GVE-6001-AEC1 | 36V, 10A, ultra-low quiescent current, synchronous step-down converter |
| MPQ5850-AEC1 | 36V, smart diode controller with reverse protection |
Notes:
3) For non-public parts, contact an MPS FAE.
2.4 System Specifications
Table 3: System Specifications
| Parameter | Specifications |
| Pre-Regulator Input Voltage (VIN) Range | 3.3V to 36V |
| Pre-Regulator Power Rating | 33W |
| Low-Current Rails | 8 Rails |
| Low-Current Voltage Regulator (VR) Output Power | 21W |
| High-Current Rails | 1 Rail |
| High-Current VR Output Power | 8.25W |
| Board Form Factor | 145mmx160mmx20mm |
Table 4: Detailed System Specifications
| Rail | PN | DC Voltage Level (V) | DC Voltage Ripple (4) (mV) | Switching Frequency (kHz) | Peak Efficiency (5) (%) |
| PRE_REG | MPQ4372 | 3.35 | 50.08 | 2200 | 90.8 |
| VDD_C0RE | MPQ2286 | 0.76 | 10.42 | 2200 | 90 |
| 1V1 | MPQ7920 (Buck 1) | 1.11 | 14.58 | 2000 | 83.9 |
| 1V8_RING | MPQ7920 (Buck 2) | 1.79 | 9.02 | 2000 | 89.9 |
| 0V6 | MPQ7920 (Buck 3) | 0.60 | 5.75 | 2000 | 74.6 |
| 1V25_MCU | MPQ7920 (Buck 4) | 1.26 | 10.89 | 2000 | 84.8 |
| 1V8_EQ | MPQ7920 (LDO 0) | 1.79 | 6.90 | - | - |
| 0V75_MIPI | MPQ7920 (LDO 1) | 0.74 | 16.34 | - | - |
| 3V3 | MPQ5075A | 3.3 | 25.97 | - | 99.7 |
| 5V_CAN | MPQ3414B | 5.00 | 16.02 | 2200 | - |
Notes:
4) These values are at the maximum load current and 25°C.
5) These values are at the nominal conditions per each power supply unit (PSU) at 25°C.
Table 5: Transient Response Specifications
| Rail | Nominal Voltage (V) | Nominal Current (A) | Current Change Rate (A/µs) | Current Change Transient Magnitude (A) | Total Voltage Change (6) (mVPP) | Total Voltage Change (6) (%) |
| VDD_CORE | 0.75 | 11.3 | 7.5 | 7.5 | 30.56 | 4.07 |
| 1V1 | 1.1 | 2 | 1 | 1 | 17.71 | 1.61 |
| 1V8_RING | 1.8 | 1.5 | 0.15 | 0.15 | 45.44 | 2.52 |
| 0V6 | 0.6 | 2 | 1 | 1 | 14.60 | 2.43 |
| 1V25_MCU | 1.25 | 2 | 1 | 1 | 30.71 | 2.45 |
| 1V8_EQ | 1.8 | 0.3 | 0.15 | 0.15 | 56.73 | 3.15 |
| 0V75_MIPI | 0.75 | 0.25 | 0.125 | 0.125 | 40.06 | 5.34 |
| 3V3 | 3.3 | 3 | 2 | 2 | 76.42 | 2.31 |
| 5V_CAN | 5 | 0.3 | 0.15 | 0.15 | 185.90 | 3.71 |
Note:
6) Including load transient, DC accuracy, and IR drop
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