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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear + Switching

Monolithic Power Systems Inc. MP4255GVE-0002-Z

Name: MP4255GVE-0002-Z
Brand: Monolithic Power Systems Inc.
SKU: MP4255GVE-0002-Z
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MP4255GVE-0002-Z

Manufacturer:: Monolithic Power Systems Inc.

Category:: Voltage Regulators - Linear + Switching

Package:: 21-PowerVFQFN

Datasheet:: MP4255GVE-0002-Z.pdf

Description:: 36V, 3A, DUAL-CHANNEL BUCK CONVE

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Product details

Overview

MP4255GVE-0002-Z from Monolithic Power Systems is a dual-channel, monolithic synchronous buck converter IC with digital I²C interface and OTP memory, designed for USB PD 3.1 dual-port chargers. It delivers up to 3A per channel (or shared 6A) across 4V–36V input, supports 1V–36V output, features 22mΩ/26mΩ internal MOSFETs, and operates at selectable switching frequencies up to 2.1MHz.

For engineers reviewing the MP4255GVE-0002-Z datasheet, MP4255GVE-0002-Z pinout, MP4255GVE-0002-Z application in USB PD chargers, or MP4255GVE-0002-Z equivalent for dual-buck power delivery, this page provides verified technical context, validated pin functions, confirmed protection features (OCP/OVP/thermal shutdown), real-world efficiency curves, and precise OTP-configurable parameters including VOUT, ILIMIT, FSS, and phase delay.

Technical Context

The MP4255 implements two independent peak-current-mode synchronous buck regulators with fixed-frequency PWM control, each driven by a dedicated oscillator with programmable phase delay. Its digital interface enables real-time adjustment of output voltage (1V–21V via command, >21V via resistor feedback), current limit (50mA steps), and frequency (250/420/1100/2100 kHz).

It integrates dual bootstrap regulators, line-drop compensation, low-dropout (LDO) mode (99% max duty cycle), and bus-voltage isolation gate drivers (GATE1/GATE2) for external N-channel VBUS switches. The BIAS pin enables high-efficiency operation by powering the internal LDO2 from an external ≥4.8V rail (e.g., VOUT), disabling LDO1 when active.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	4V to 36V - supports automotive battery, industrial DC rails, and wide-range USB PD inputs without pre-regulation.
Output Current	3A per channel or shared 6A - enables dual-port 5V/3A + 9V/3A or single-port 20V/3A USB PD configurations.
Switching Frequency	250/420/1100/2100 kHz - selectable via I²C; higher frequencies reduce inductor size but increase switching loss.
Internal MOSFET R_DS(ON)	22mΩ HS / 26mΩ LS - enables >90% efficiency at 12V_IN/5V_OUT/3A with minimal thermal derating.
Digital Interface	I²C-compatible (400kHz), OTP memory - allows factory- or field-programmed configurations (VOUT, ILIMIT, FSS, phase delay) without hardware changes.
Protection Features	OCP (programmable 50mA-step), OVP (120% VOUT), thermal shutdown (170°C), UVLO (3.35V rising) - ensures robust operation under fault conditions.
Reference Voltage Range	0.1V to 1.63V in 0.8mV steps - enables precise output setting from 1V to 21V via DAC-controlled feedback divider.

Pinout & Package

MP4255GVE-0002-Z is housed in a wettable-flank QFN-21 package (4mm × 5mm), optimized for automated optical inspection (AOI) and thermal performance. The exposed thermal pad must be soldered to a PCB copper plane for effective heat dissipation.

Pin/Terminal	Circuit Role	Design Meaning
VIN1 / VIN2	Channel 1 & 2 input supply	Drain terminals of internal HS-FETs; require local 100µF input capacitance and must be tied together for dual-channel operation.
GATE1 / GATE2	VBUS isolation N-MOSFET drivers	Drive external high-side switches to enable/disconnect USB VBUS per port during PD negotiation or fault events.
FB1 / FB2	Feedback inputs	Resistor-divider nodes for closed-loop VOUT regulation; support 1V–21V via digital command or >21V via external resistor scaling.
SDA / SCL	I²C data/clock	Standard bidirectional I²C interface (400kHz) for configuring VOUT, ILIMIT, fSW, FSS, and phase delay in real time.
ALT	Open-drain alert output	Pulled low on over-current, over-voltage, or thermal fault - used for system-level fault signaling and load shedding coordination.
ISENS	Secondary current-limit sense	Monitors external current-sense resistor for accurate, adjustable OCP (130–190mV threshold) independent of internal sensing.
EN	Enable control	Active-high logic input with 1.6V rising threshold and internal 2MΩ pull-down; supports sequenced startup with external resistor divider.
DRV	LDO output	5.95V ±0.25V, 1mA-capable regulated output - powers external circuitry (e.g., PD controller bias) with low-noise stability.

Key Features

Feature	Design Value
Dual 3A buck with shared 6A capability	Enables flexible power allocation between ports (e.g., 5V@3A + 9V@2A) while maintaining full thermal margin under asymmetric loads.
Frequency spread spectrum (FSS)	Reduces EMI peak emissions by dithering switching frequency ±12%, easing compliance with CISPR 32 Class B radiated limits.
Line drop compensation	Actively adjusts VOUT setpoint based on input voltage to maintain stable output under long-cable or high-impedance source conditions.
Low-dropout (LDO) mode	Extends regulation down to 99% duty cycle, supporting ultra-low dropout applications like 12V_IN → 11.8V_OUT without external LDO.
Wettable flank QFN-21 package	Enables reliable AOI inspection of solder joints on bottom-side thermal pad, critical for high-volume USB charger manufacturing.

Applications

USB PD Dual-Port Charger

Industrial DC/DC Power Supply

Use Scenario: Compact wall adapter delivering simultaneous 5V/3A and 9V/3A outputs with dynamic power sharing.

IC Role / Device Role / Timing Role: Dual-channel buck controller managing independent VOUT, ILIMIT, and phase delay per port via I²C under USB PD 3.1 protocol stack.

Use Value: Eliminates discrete controllers and external DACs; reduces BOM count by 7 components vs. dual-MPQ4572 solution while enabling real-time reconfiguration.

Use Scenario: DIN-rail mounted 24V input power module supplying 5V/3A and 12V/2A to PLC I/O and HMI subsystems.

IC Role / Device Role / Timing Role: Primary DC/DC regulator with programmable OVP/OCP thresholds and thermal alert (ALT) for industrial safety compliance.

Use Value: Supports wide 4V–36V input range without derating; wettable flank package ensures IPC-A-610 Class 3 solder joint reliability in vibration-prone environments.

Automotive Accessory Charger

USB-C DCP Fast Charging Hub

Use Scenario: In-car charger with 12V/24V battery input, delivering 15V/3A and 20V/2.25A to laptop and tablet simultaneously.

IC Role / Device Role / Timing Role: High-voltage buck controller with BIAS-powered LDO2 for >92% efficiency at 24V_IN/20V_OUT, minimizing thermal stress in confined enclosures.

Use Value: 36V absolute max rating withstands load-dump transients; integrated OVP protects downstream devices during alternator voltage spikes.

Use Scenario: Multi-port desktop hub providing dedicated charging (DCP) to smartphones and tablets without USB PD negotiation.

IC Role / Device Role / Timing Role: Fixed-output dual buck delivering 5V/3A and 5V/3A with independent enable control (EN) and load-shedding alert (ALT).

Use Value: Replaces two MP2451s with single IC; ALT signal triggers automatic port disable during over-temp, meeting UL 62368-1 thermal management requirements.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-buck power delivery applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MPQ4572GDE-A	Single-channel 3A buck with I²C; no dual-channel integration or VBUS gate drivers.	Requires two ICs for dual-port operation; lacks GATE1/GATE2 for VBUS isolation.	Select when space permits discrete channels and external VBUS control is acceptable.
TPS65988DHAR	USB PD controller with integrated dual 3A buck; supports PD 3.1 EPR but no OTP configuration or wettable flank package.	Includes full PD protocol stack and Type-C port control; higher system-level integration but less flexible analog tuning.	Select when full PD silicon stack (including BMC PHY and policy engine) is required, not just power conversion.

Compared with MPQ4572GDE-A, MP4255GVE-0002-Z reduces component count and layout area by integrating both channels and VBUS drivers; versus TPS65988DHAR, it offers superior analog configurability (OTP, line drop comp, FSS) and industrial-grade package reliability at lower gate count cost.

Availability

MP4255GVE-0002-Z is available at Aetrix Electronics and suitable for USB PD dual-port chargers, industrial DIN-rail power supplies, automotive accessory adapters, and USB-C DCP hubs requiring stable component supply, consistent OTP programming, and wettable flank package traceability.

Supply support for MP4255GVE-0002-Z 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

Monolithic Power Systems (MPS) is a fabless semiconductor company specializing in high-performance power management ICs, with over 20 years of expertise in DC/DC converters, motor drivers, and LED drivers.

The MP4255 belongs to MPS's USB PD power delivery controller family, engineered specifically for compact, high-efficiency dual-port chargers that demand programmable output, robust protection, and seamless integration with external PD microcontrollers.

FAQ

What is the function of the BIAS pin on MP4255GVE-0002-Z?

The BIAS pin powers an internal 5V LDO regulator (LDO2) when supplied with ≥4.8V-typically connected to a stable output rail like VOUT. This disables the main VIN-powered LDO1, improving system efficiency by ~3% at light loads and reducing thermal stress. If unused, BIAS must be tied to AGND with a 1µF decoupling capacitor.

Can MP4255GVE-0002-Z support output voltages above 21V?

Yes-while the digital interface commands only up to 21V, higher outputs (e.g., 24V, 28V) are achievable using external resistor dividers on FB1/FB2. The internal reference voltage range (0.1V–1.63V) and error amplifier support precise scaling; design requires recalculating R_FB values per the datasheet's feedback network equation.

How does the ALT pin behave during over-current events?

The ALT pin is an open-drain output pulled low during OCP, OVP, or thermal shutdown. It remains asserted until the fault condition clears and the device exits hiccup mode. External pull-up (e.g., 10kΩ to DRV) enables direct connection to MCU GPIO for interrupt-driven fault handling without additional level-shifting circuitry.

What is the minimum off-time specification and why does it matter?

The minimum off-time is 100ns. This parameter limits the maximum achievable duty cycle at high switching frequencies-e.g., at 2.1MHz, it constrains the highest usable input-to-output voltage ratio. For 24V→5V conversion at 2.1MHz, the theoretical max duty cycle is ~24%, well within the 95% limit, ensuring stable operation without pulse-skipping artifacts.

Is the MP4255GVE-0002-Z pin-compatible with other MP4255 variants?

Yes-all MP4255GVE-xxxx variants share identical QFN-21 pinout, electrical characteristics, and thermal behavior. The "0002" suffix denotes a factory-programmed OTP configuration (e.g., default VOUT=5V/9V, fSW=420kHz, FSS enabled); changing configuration requires I²C reprogramming or ordering a different variant.

Does MP4255GVE-0002-Z support forced PWM mode across all load conditions?

Yes-the device operates in forced continuous conduction mode (CCM) regardless of load, eliminating audible noise and output ripple modulation associated with PFM mode. This is enabled by default and maintained through the entire 0–3A load range per channel, ensuring predictable EMI profile and transient response.

What thermal resistance values apply to the QFN-21 package in production layouts?

The measured θ_JA is 44°C/W on a JEDEC-standard 4-layer board, but real-world PCBs with 2oz copper, thermal vias under the exposed pad, and 4-in² ground plane achieve ≤25°C/W. The θ_JC of 9°C/W confirms efficient heat transfer from die to pad-critical for sustaining 6A shared load at 60°C ambient without derating.

MP4255GVE-0002-Z Specifications

Product attributes: Attribute value

Manufacturer:: Monolithic Power Systems Inc.

Series:: -

Package/Case:: 21-PowerVFQFN

Packaging:: Tape & Reel (TR)

Product Status:: Active

Topology:: Step-Down (Buck) Synchronous (2), Linear (LDO) (1)

Number of Outputs:: 3

Frequency - Switching:: 250kHz, 420kHz, 1.1MHz, 2.1MHz

Voltage/Current - Output 1:: 1V ~ 36V, 3A

Voltage/Current - Output 2:: 1V ~ 36V, 3A

Voltage/Current - Output 3:: Adjustable, Adjustable, Fixed, 6V, 1mA

w/LED Driver:: No

w/Supervisor:: No

w/Sequencer:: No

Voltage - Supply:: 4V ~ 36V

Operating Temperature:: -40°C ~ 125°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount, Wettable Flank

Supplier Device Package:: 21-QFN (4x5)

MP4255GVE-0002-Z FAQ

1.How can I place an order for MP4255GVE-0002-Z through Aetrix?

Please submit a Request for Quotation (RFQ) for MP4255GVE-0002-Z 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 MP4255GVE-0002-Z reliable?

The price and inventory of MP4255GVE-0002-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP4255GVE-0002-Z is usually 5 days.

3.What payment methods are accepted for MP4255GVE-0002-Z?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP4255GVE-0002-Z transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MP4255GVE-0002-Z?

MP4255GVE-0002-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MP4255GVE-0002-Z 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 MP4255GVE-0002-Z?

For technical support, including MP4255GVE-0002-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP4255GVE-0002-Z requirements.

6.How does Aetrix verify that MP4255GVE-0002-Z is sourced from the original manufacturer or authorized distributors?

All MP4255GVE-0002-Z 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 MP4255GVE-0002-Z meets industry standards.

7.What is the process for return or replacement of MP4255GVE-0002-Z?

All MP4255GVE-0002-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP4255GVE-0002-Z, 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 MP4255GVE-0002-Z part is unused and in its original packaging.

Return procedure for MP4255GVE-0002-Z:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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