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Microchip Technology MCP19123T-E/MQ
- Part No.:
- MCP19123T-E/MQ
- Manufacturer:
- Microchip Technology
- Category:
- DC DC Switching Controllers
- Package:
- 28-VFQFN Exposed Pad
- Datasheet:
-
MCP19123T-E/MQ.pdf
- Description:
- IC REG CTRLR BCK PMBUS 28QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,137
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Product details
Overview
MCP19123T-E/MQ from Microchip Technology is a digitally enhanced synchronous buck controller with integrated high- and low-side gate drivers, 8-bit PIC® microcontroller core, 4 KB flash memory, and configurable analog peripherals. It operates from 4.5V to 40V input, delivers 0.3V–16V output with 0.1% typical voltage accuracy, supports 100 kHz–1.6 MHz switching frequency, and features AEC-Q100 qualification for automotive power systems.
For engineers reviewing the MCP19123T-E/MQ datasheet, MCP19123T-E/MQ pinout, MCP19123T-E/MQ application, or MCP19123T-E/MQ equivalent, this device enables programmable overcurrent/UVLO/OVLO protection, emulated average current mode control, differential remote sensing, multi-phase synchronization, and I²C/PMBus™ host communication in compact DC/DC converter designs.
Technical Context
The MCP19123T-E/MQ integrates a mixed-signal analog PWM controller with a fully functional PIC16F mid-range MCU core - enabling real-time firmware-based adaptation of loop compensation, soft-start profiles, dead-time tuning, and fault response without external components. Its dual-domain architecture separates critical analog regulation (emulated current mode, VOUT sense amplifier, ISP/ISN current sensing) from digital configuration (I²C registers, flash-programmable thresholds, ADC-monitored parameters).
It supports master/slave operation in both multi-phase and multiple-output topologies via synchronized switching and shared current sense signals, with dedicated pins (GPA1, GPB3, GPB1) reconfigurable as sync clock I/O or current reference I/O based on MODECON register settings. The 28-pin 5×5 mm QFN package isolates PGND and GND, separates BOOT/HDRV/PHASE/LDRV drive paths, and provides 24 ADC channels (8 external) for closed-loop telemetry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 40V operating; supports 48V non-operating transients - enables direct integration into 12V/24V/36V automotive and industrial rails. |
| Output Voltage Accuracy | ±0.1% typical over line/load/temperature - eliminates need for external trimming in precision point-of-load applications. |
| Switching Frequency | 100 kHz to 1.6 MHz programmable - allows optimization of size (higher fSW) vs. efficiency (lower fSW) in magnetic design. |
| Gate Drive Capability | +5V drive with 2A source / 4A sink (low-side), 2A source / 2A sink (high-side) - directly drives 10 nC MOSFETs at >1 MHz without external buffers. |
| ADC Resolution & Channels | 10-bit resolution with 24 internal + 8 external analog inputs - supports real-time monitoring of VIN, VOUT, ISENSE, temperature, and auxiliary voltages. |
| Memory & Debug | 4096-word flash (100k write endurance), In-Circuit Debug (ICD) via GPB4/GPB5, ICSP™ via GPA6/GPA7 - enables field firmware updates and runtime diagnostics. |
| Qualification | AEC-Q100 Grade 1 (−40°C to +125°C ambient) - certified for under-hood automotive DC/DC converters and industrial motor controls. |
Pinout & Package
Package: 28-pin QFN (5 mm × 5 mm, 0.5 mm pitch) with exposed thermal pad (EP). Pin count and I/O allocation match MCP19123 specification - includes 16 GPIOs, 8 external ADC inputs, dual CCD inputs (GPB6, GPA6), external A/D reference (GPB7), and dedicated I²C (SCL/SDA), ICSP™ (ICSPDAT/ICSPCLK), and ICD (ICDDAT/ICDCLK) interfaces.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Primary power input | Accepts 4.5V–40V unregulated supply; powers internal LDOs and high-voltage bias circuitry. |
| VDD | +5V regulated output | Internal LDO output powering digital logic, ADC, and I/O; requires local 1 µF ceramic decoupling. |
| PGND | Power ground return | High-current return path for LDRV, HDRV, PHASE, ISP, ISN - must be connected to power plane under exposed pad. |
| GND | Signal ground reference | Low-noise reference for analog circuits (ADC, comparators, VSEN), isolated from PGND to minimize noise coupling. |
| HDRV / LDRV | High-/low-side gate drivers | Floating (HDRV) and grounded (LDRV) 5V CMOS outputs driving external N-channel MOSFET gates with 2A/4A peak current. |
| PHASE | Switch node connection | Connects to drain of high-side FET and source of low-side FET - critical for bootstrap capacitor charging and gate timing integrity. |
| BOOT | Bootstrap supply | Provides floating +5V rail for high-side driver; requires 0.1 µF ceramic capacitor between BOOT and PHASE. |
| +VSEN / –VSEN | Differential output voltage sense | Rejects common-mode noise on feedback path; enables Kelvin sensing for <0.1% regulation accuracy across PCB traces. |
| ISP / ISN | Current sense inputs | High-side or low-side shunt monitor inputs feeding internal 500 mV threshold comparator and ADC channel. |
| GPA0–GPA7, GPB0–GPB7 | Configurable GPIO/ADC/I²C/ICSP/ICD | 16 general-purpose I/Os with interrupt-on-change, 8 external ADC channels, I²C (SCL/SDA), ICSP™ (GPA6/GPA7), ICD (GPB4/GPB5). |
Key Features
| Feature | Design Value |
|---|---|
| Emulated average current mode control | Enables stable, fast-transient-response regulation without external current-sense amplifier or slope compensation. |
| Differential remote output sensing | Compensates for IR drop in PCB traces and connectors - maintains ±0.1% output accuracy at load point. |
| Multi-phase master/slave synchronization | Allows up to N-phase interleaving with common current sense signal and phase-aligned switching - reduces input/output ripple. |
| Configurable protection thresholds | Runtime-adjustable OVLO, UVLO, OVP, UVP, and overcurrent limits via I²C or flash programming - eliminates discrete resistor networks. |
| Integrated 8 MHz factory-calibrated oscillator | Eliminates external crystal; provides stable clock for PWM timing, ADC sampling, and firmware execution across temperature. |
| PMBus™/I²C interface | Supports standard PMBus commands (READ_VOUT, READ_IOUT, OPERATION, STORE_DEFAULT_ALL) for system-level power management. |
Applications
| Automotive ADAS Power Supply | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Powering radar sensor SoCs requiring tightly regulated 1.0V/1.8V/3.3V rails with fast load-step response and fault logging. IC Role / Device Role / Timing Role: Primary synchronous buck controller with integrated MCU managing dynamic voltage scaling, thermal derating, and CAN/I²C fault reporting. Use Value: AEC-Q100 qualification, differential VSEN, and programmable soft-start ensure compliance with ISO 26262 ASIL-B power subsystem requirements. |
Use Scenario: Generating isolated 5V/12V/24V auxiliary supplies for analog input modules in harsh factory environments. IC Role / Device Role / Timing Role: Digitally configurable buck controller providing precise output tracking, input UVLO hysteresis tuning, and watchdog-protected firmware reset. Use Value: 40V max input withstand and 125°C ambient rating enable direct connection to 24V industrial bus without pre-regulation. |
| Telecom Remote Radio Unit | Medical Imaging Power Sequencer |
|
Use Scenario: High-efficiency 48V-to-12V conversion for RF power amplifiers with strict EMI limits and thermal throttling. IC Role / Device Role / Timing Role: Multi-phase master coordinating parallel buck stages via GPA1/GPB3 sync signals and shared ISP/ISN current sense. Use Value: 1.6 MHz max switching frequency minimizes magnetics size while maintaining >92% efficiency at full load. |
Use Scenario: Sequenced, monitored power delivery to X-ray detector ASICs requiring precise ramp-up, overvoltage lockout, and event-triggered logging. IC Role / Device Role / Timing Role: Programmable power controller executing custom startup sequence, ADC-monitored rail validation, and nonvolatile fault history storage. Use Value: 4 KB flash and 100k-cycle endurance allow field updates of sequencing algorithms without hardware change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar digitally enhanced buck controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP19122T-E/MQ | 24-pin QFN (4×4 mm); 12 GPIOs; no GPB4–GPB7, CCD, or external VREF; identical analog controller and driver specs. | Limited I/O count and no dual CCD or external ADC reference - suitable for simpler single-rail designs without advanced telemetry. | Select MCP19122T-E/MQ when board space is constrained and only basic buck control + minimal telemetry is required. |
| LM5145RQNT | Analog-only controller (no MCU); 100 kHz–2 MHz fSW; 5V/2A gate drive; no flash, ADC, or I²C - requires external micro for digital features. | No firmware programmability or telemetry - used where cost-sensitive, fixed-function control suffices and host processor handles monitoring. | Select LM5145RQNT when deterministic analog performance is prioritized over configurability and system-level communication. |
Compared with MCP19122T-E/MQ, the MCP19123T-E/MQ adds 4 GPIOs, dual CCD inputs, external ADC reference, and debug interfaces - enabling richer telemetry and multi-rail coordination. Versus LM5145RQNT, it trades analog simplicity for integrated firmware control, eliminating external MCU dependency but increasing BOM count by zero.
Availability
MCP19123T-E/MQ is available at Aetrix Electronics and suitable for automotive ADAS power supplies, industrial PLC I/O modules, telecom remote radio units, and medical imaging power sequencers requiring stable component supply, long-term lifecycle support, and AEC-Q100-compliant sourcing.
Supply support for MCP19123T-E/MQ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Microchip Technology Inc. is a leading provider of microcontrollers, analog devices, and Flash-IP solutions, serving automotive, industrial, consumer, and communications markets with vertically integrated silicon and development tools.
The MCP19123T-E/MQ belongs to Microchip's Digitally Enhanced Power Analog Controller product line, designed to replace traditional analog controllers with firmware-adaptable, PMBus™-enabled DC/DC regulation for next-generation power systems.
FAQ
What is the maximum switching frequency supported by the MCP19123T-E/MQ?
The MCP19123T-E/MQ supports a programmable switching frequency range from 100 kHz to 1.6 MHz. This range is set via firmware configuration or PMBus™ command and enables trade-offs between magnetic component size (higher frequency) and conduction losses (lower frequency). The internal oscillator and gate drivers maintain timing integrity across the full range without external compensation.
Does the MCP19123T-E/MQ include an internal voltage reference for the ADC?
Yes, the MCP19123T-E/MQ includes an internal 500 mV reference for its current-sense comparator and supports an external voltage reference on GPB7 (VADC) for the 10-bit ADC. When enabled, the external reference improves ADC accuracy for precision measurements such as shunt-based current sensing or auxiliary rail monitoring.
How many analog input channels does the MCP19123T-E/MQ ADC support?
The MCP19123T-E/MQ ADC supports 24 internal analog channels and 8 external analog input channels. External channels map to GPA0–GPA3, GPB0–GPB2, GPB4–GPB7, enabling simultaneous monitoring of VIN, VOUT, ISP/ISN, temperature sensors, and auxiliary voltages without external multiplexers.
Can the MCP19123T-E/MQ operate as both master and slave in multi-phase configurations?
Yes, the MCP19123T-E/MQ can be configured as either master or slave in multi-phase systems using the MODECON register. As master, it generates the synchronized switching clock and shares sensed current via GPB1; as slave, it accepts that clock and current reference to align phase and regulate current sharing - all without external logic.
Is the MCP19123T-E/MQ pin-compatible with the MCP19122T-E/MQ?
No, the MCP19123T-E/MQ is not pin-compatible with the MCP19122T-E/MQ. The MCP19123T-E/MQ uses a 28-pin 5×5 mm QFN package with additional pins (GPB4–GPB7, GPB6, GPB7), while the MCP19122T-E/MQ uses a 24-pin 4×4 mm QFN. Layout redesign is required to migrate between them due to different pin count, pitch, and I/O allocation.
MCP19123T-E/MQ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Microchip Technology
- Series:
- -
- Package/Case:
- 28-VFQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Type:
- PWM Signal
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Number of Outputs:
- 1
- Output Phases:
- 2
- Voltage - Supply (Vcc/Vdd):
- 4.5V ~ 40V
- Frequency - Switching:
- 100kHz ~ 1.6MHz
- Duty Cycle (Max):
- -
- Synchronous Rectifier:
- Yes
- Clock Sync:
- Yes
- Serial Interfaces:
- I2C, PMBus, SMBus
- Control Features:
- Enable, Frequency Control, Power Good, Soft Start, Watchdog
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-QFN (5x5)
MCP19123T-E/MQ FAQ
1.How can I place an order for MCP19123T-E/MQ through Aetrix?
Please submit a Request for Quotation (RFQ) for MCP19123T-E/MQ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MCP19123T-E/MQ reliable?
The price and inventory of MCP19123T-E/MQ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MCP19123T-E/MQ is usually 5 days.
3.What payment methods are accepted for MCP19123T-E/MQ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MCP19123T-E/MQ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MCP19123T-E/MQ?
MCP19123T-E/MQ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MCP19123T-E/MQ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MCP19123T-E/MQ?
For technical support, including MCP19123T-E/MQ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MCP19123T-E/MQ requirements.
6.How does Aetrix verify that MCP19123T-E/MQ is sourced from the original manufacturer or authorized distributors?
All MCP19123T-E/MQ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MCP19123T-E/MQ meets industry standards.
7.What is the process for return or replacement of MCP19123T-E/MQ?
All MCP19123T-E/MQ units undergo pre-shipment inspection (PSI). If there is an issue with MCP19123T-E/MQ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MCP19123T-E/MQ part is unused and in its original packaging.
Return procedure for MCP19123T-E/MQ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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