Application NoteNxp

Power Supplies on the MPC5500 Application Note

Guidelines for using the on-chip regulator controller and managing power supply sequencing for the NXP MPC5500 microcontroller family.

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Overview

This application note provides technical guidance on the on-chip regulator controller (VRC) and supply control for MPC5500 family microcontrollers. It details the requirements for managing 5.0 V, 3.3 V, and core operating voltages (1.5 V or 1.2 V), including power-up sequencing, ramp rates, and pin states during reset. The document explains how to utilize external NPN bypass transistors to handle core current and power dissipation, ensuring thermal efficiency and cost-effective design. It also covers power-on reset (POR) circuit behavior, transient current considerations, and circuit architecture for core regulation using components like the BCP68 and NJD2873.

Use Cases

Implementing core voltage regulation for MPC5500 MCUs
Designing power sequencing for automotive and industrial embedded systems
Thermal management using external bypass transistors for high-performance MCUs
Configuring power-on reset and monitoring circuits for Freescale microcontrollers

Topics

MPC5500

Voltage Regulator Controller

VRC

MPC5554

Power Sequencing

Core Voltage

NPN Bypass Transistor

BCP68

NJD2873

Power-on Reset

NCP1117DT15

Referenced Parts

BCP68

Onsemi

Example Gain Table from ON Semiconductor BCP68 Data Sheet (Rev. 4, April 2004)

NCP1117DT15

Onsemi

standalone commercial single rail regulator, such as ON Semiconductor NCP1117DT15, may be used to source the 1.5 V core current.

NJD2873

Onsemi

Recommended Transistor ... NJD2873

BCP68

Onsemi

Table 5. Example Gain Table from ON Semiconductor BCP68 Data Sheet (Rev. 4, April 2004)

BCP68

Onsemi

Figure 7. Temperature Response from ON Semiconductor BCP68 Data Sheet

BCP68

Onsemi

Figure 4. Example Temperature Response from ON Semiconductor BCP68 Data Sheet

BCP68

Onsemi

Table 6. Gain Table from ON Semiconductor BCP68 Data Sheet

NCP1117DT15

Onsemi

standalone commercial single rail regulator, such as ON Semiconductor NCP1117DT15, may be used to

MPC5534

Freescale Semiconductor

Table 4. MPC5500 VDD Current Specifications ... MPC5534

MPC5553

Freescale Semiconductor

defined by a table (“MPC5554 Signal Properties”) in the MPC5553/5554 reference manual.

MPC5554

Freescale Semiconductor

expanded from Tables 5 and 6, “Power Sequence Pin States”, of the MPC5554 data sheet.

MPC5565

Freescale Semiconductor

Table 4. MPC5500 VDD Current Specifications ... MPC5565

MPC5566

Freescale Semiconductor

Table 4. MPC5500 VDD Current Specifications ... MPC5566

MPC5567

Freescale Semiconductor

Table 4. MPC5500 VDD Current Specifications ... MPC5567

BCP68	Onsemi	Example Gain Table from ON Semiconductor BCP68 Data Sheet (Rev. 4, April 2004)
NCP1117DT15	Onsemi	standalone commercial single rail regulator, such as ON Semiconductor NCP1117DT15, may be used to source the 1.5 V core current.
NJD2873	Onsemi	Recommended Transistor ... NJD2873
BCP68	Onsemi	Table 5. Example Gain Table from ON Semiconductor BCP68 Data Sheet (Rev. 4, April 2004)
BCP68	Onsemi	Figure 7. Temperature Response from ON Semiconductor BCP68 Data Sheet
BCP68	Onsemi	Figure 4. Example Temperature Response from ON Semiconductor BCP68 Data Sheet
BCP68	Onsemi	Table 6. Gain Table from ON Semiconductor BCP68 Data Sheet
NCP1117DT15	Onsemi	standalone commercial single rail regulator, such as ON Semiconductor NCP1117DT15, may be used to
MPC5534	Freescale Semiconductor	Table 4. MPC5500 VDD Current Specifications ... MPC5534
MPC5553	Freescale Semiconductor	defined by a table (“MPC5554 Signal Properties”) in the MPC5553/5554 reference manual.
MPC5554	Freescale Semiconductor	expanded from Tables 5 and 6, “Power Sequence Pin States”, of the MPC5554 data sheet.
MPC5565	Freescale Semiconductor	Table 4. MPC5500 VDD Current Specifications ... MPC5565
MPC5566	Freescale Semiconductor	Table 4. MPC5500 VDD Current Specifications ... MPC5566
MPC5567	Freescale Semiconductor	Table 4. MPC5500 VDD Current Specifications ... MPC5567