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Monolithic Power Systems Inc. MP8864GQ-Z
- Part No.:
- MP8864GQ-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 15-PowerVFQFN
- Datasheet:
-
MP8864GQ-Z.pdf
- Description:
- IC REG BUCK PROG 4A 15QFN
- Quantity:
- Payment:
- Shipping:
Inventory:5,653
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Product details
Overview
MP8864GQ-Z from Monolithic Power Systems is a high-efficiency, 4 A, 21 V synchronous step-down DC/DC converter with I²C programmability. It integrates 50 mΩ/23 mΩ MOSFETs, delivers 1% output voltage accuracy, supports 0.6–1.87 V output in 10 mV steps via I²C, and operates across 4.5–21 V input for SoC core rail regulation in media processors.
For engineers reviewing the MP8864GQ-Z datasheet, MP8864GQ-Z pinout, MP8864GQ-Z application, or MP8864GQ-Z equivalent, this page provides verified pin functions, real-world I²C-configurable operation modes (CCM/AAM/DCM), thermal shutdown at 160°C, power-good timing with 80 µs deglitch, and QFN-15 package layout guidance for high-current PCB design.
Technical Context
The MP8864GQ-Z uses current-mode control with internal error amplifier and optimized compensation to enable fast transient response and stable loop behavior across load and line variations. Its dual-control architecture supports both FB resistor-based and I²C-sensed VOUT regulation paths, with seamless transition between them based on V_BOOT register bit state.
I²C interface operates up to 3.4 Mbps in high-speed mode and supports full configuration: output voltage (7-bit DAC, 10 mV steps), slew rate (3-bit programmable), switching frequency (default 600 kHz, selectable), power-saving mode, OCP hiccup enable, and OTP status readback - all without external component changes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 21 V - supports wide industrial and automotive input rails including 12 V nominal systems. |
| Output Current | 4 A continuous - sufficient for SoC core supplies with margin for peak transient loads. |
| Output Voltage Range | 0.6 V to 1.87 V in 10 mV steps - enables precise core voltage tuning for dynamic DVFS in media processors. |
| Feedback Accuracy | ±1% over -40°C to +125°C - ensures tight regulation under thermal stress without calibration. |
| Switching Frequency | Default 600 kHz, programmable via I²C - balances efficiency, size, and EMI for compact 3 mm × 3 mm layout. |
| RDS(ON) | 50 mΩ (HS) / 23 mΩ (LS) - minimizes conduction loss and improves full-load efficiency above 92%. |
| Thermal Shutdown | 160°C with 20°C hysteresis - protects die during sustained overload while enabling safe recovery at 140°C. |
Pinout & Package
MP8864GQ-Z is housed in a thermally enhanced 15-pin QFN package (3 mm × 3 mm, 0.5 mm pitch) with exposed thermal pad. The package supports high-current routing and efficient heat dissipation in space-constrained applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power input | Accepts 4.5–21 V; requires low-ESR ceramic decoupling and wide PCB trace for 4 A input current. |
| PGND (Pins 2,8) | Power ground | High-current return path for SW node; must be connected to thermal pad and system GND with multiple vias. |
| EN/SYNC (Pin 3) | Enable & sync input | Active-high enable with 1 MΩ internal pull-down; doubles as 300 kHz–2 MHz external clock sync input. |
| PG (Pin 4) | Power good indicator | Open-drain output with 80 µs deglitch; asserts high when VOUT reaches 90% of target, low on UV/OCP/TSD. |
| SDA/SCL (Pins 5,6) | I²C data/clock | 3.4 Mbps high-speed I²C slave interface; supports address selection via ADD pin and bus-level noise filtering. |
| ADD (Pin 7) | I²C address select | Logic level sets one of two I²C addresses - floating/VCC = addr A, GND = addr B - enabling multi-device bus sharing. |
| SW (Pin 9) | Switch node | Drives external inductor; requires short, wide trace to minimize ringing and EMI in high-dI/dt switching path. |
| BST (Pin 10) | Bootstrap supply | Connects to SW via 0.1 µF ceramic capacitor; powers high-side gate driver; includes internal 5 V clamp. |
| VOUT (Pin 11) | I²C voltage sense | Direct connection to output rail for I²C control loop; disables FB loop when V_BOOT=0. |
| FB (Pin 12) | Feedback input | Resistor-divider tap for analog regulation; pulled to VCC for default 0.9 V startup if I²C not used. |
| SS (Pin 13) | Soft-start timing | Capacitor-to-ground sets ramp time; internal 12 µA current source enables monotonic pre-bias start-up. |
| VCC (Pin 14) | Internal LDO output | 5 V regulated supply for internal circuitry; requires 0.22 µF ceramic decoupling; tracks VIN below 5 V. |
| AGND (Pin 15) | Analog ground | Signal reference for FB, SS, VOUT; must be tied to PGND at single point near IC to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| I²C-programmable output voltage | Adjustable from 0.6 V to 1.87 V in 10 mV increments with controlled slew rate - enables dynamic voltage scaling for power-aware SoC operation. |
| Triple operating mode control | Selectable CCM, DCM, or AAM via I²C MODE bit - optimizes light-load efficiency (AAM) and heavy-load stability (CCM) without external components. |
| Integrated power MOSFETs | 50 mΩ HS and 23 mΩ LS switches - eliminate external FETs and drivers, reducing BOM count and board area in 3 mm × 3 mm footprint. |
| Robust protection suite | OCP (hiccup mode), OVP (115% trip), UVLO (4.0 V rising), TSD (160°C), and PG fault reporting - ensures autonomous fault handling without host intervention. |
| Pre-bias monotonic start-up | Starts cleanly into pre-charged output rails - prevents reverse current flow and avoids system reset during hot-plug or multi-rail sequencing. |
Applications
| Mobile SoC Core Supply | Media Processor DVFS Rail |
|---|---|
Use Scenario: Powering ARM-based application processors in smartphones and tablets requiring dynamic voltage/frequency scaling. IC Role / Device Role / Timing Role: Primary core voltage regulator with I²C-controlled VOUT adjustment synchronized to CPU workload changes. Use Value: Enables real-time voltage reduction during idle states, cutting dynamic power by >30% versus fixed-output converters. | Use Scenario: Supplying GPU and video codec cores in set-top boxes and streaming devices with bursty compute loads. IC Role / Device Role / Timing Role: High-current, low-noise buck converter delivering 1.2 V @ 4 A with <1% load regulation across 0–4 A. Use Value: Maintains stable core voltage during rapid 0→4 A transients (<100 ns response), preventing frame drops or decode errors. |
| Distributed Power System Bus Converter | Industrial Embedded Controller Rail |
Use Scenario: Generating local 1.2 V or 1.5 V rails from a 12 V intermediate bus in modular PLC or gateway designs. IC Role / Device Role / Timing Role: Compact, thermally robust point-of-load regulator with remote I²C monitoring and reconfiguration. Use Value: Eliminates need for external PMBus controller; allows field firmware updates to output voltage without hardware change. | Use Scenario: Powering ARM Cortex-M7 microcontrollers and FPGA fabric in ruggedized edge computing nodes. IC Role / Device Role / Timing Role: Primary 3.3 V or 1.8 V logic rail regulator with thermal shutdown and power-good signaling for system health monitoring. Use Value: Guarantees clean power-up sequence and fault isolation via PG assertion, meeting IEC 61000-4-2/4-4 immunity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ8864GQ-AEC1 | Automotive-grade variant with AEC-Q100 qualification, extended temperature range (-40°C to +150°C), and enhanced ESD tolerance. | Required for ADAS camera modules and infotainment head units where automotive qualification is mandatory. | Select for automotive programs; identical pinout and I²C register map but higher cost and longer lead times. |
| TPS544B20RTWR | PMBus-compatible, 4 A, 1.5–18 V input; lacks I²C slew-rate control and AAM mode; uses different compensation scheme. | Suitable for TI-centric designs needing PMBus telemetry (VIN/VOUT/IOUT/temperature) but no dynamic slew control. | Choose when PMBus telemetry and TI ecosystem integration outweigh need for fine-grained I²C voltage ramping. |
Compared with MP8864GQ-Z, MPQ8864GQ-AEC1 adds automotive reliability at the cost of qualification overhead, while TPS544B20RTWR trades I²C flexibility for PMBus telemetry and TI-specific toolchain support - neither offers identical 10 mV-step slew control or AAM efficiency optimization.
Availability
MP8864GQ-Z is available at Aetrix Electronics and suitable for mobile SoC power delivery, media processor DVFS rails, and distributed industrial power systems requiring stable component supply, full I²C configurability, and QFN-15 thermal performance.
Supply support for MP8864GQ-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 analog and power ICs, with over 20 years of expertise in DC/DC conversion, motor drivers, and LED lighting controllers.
The MP8864 belongs to MPS's high-frequency, I²C-programmable buck converter product line, designed specifically for dynamic voltage scaling in advanced SoCs and media processors where precision, density, and digital control are critical.
FAQ
What is the minimum recommended soft-start capacitor value for MP8864GQ-Z?
The soft-start capacitor value is calculated using CSS = (TSS × 12 µA) / VREF, where VREF = 0.6 V. For a 10 ms soft-start time, CSS = 200 nF. A 22 nF ceramic capacitor is commonly used for ~2 ms ramp time. Larger values improve monotonicity into pre-biased rails but must avoid current-limit tripping during startup.
Does MP8864GQ-Z support forced PWM mode, or only AAM/DCM/CCM?
MP8864GQ-Z does not support forced PWM mode. It operates in three defined modes: Advanced Asynchronous Modulation (AAM) for light-load efficiency, Discontinuous Conduction Mode (DCM), and Continuous Conduction Mode (CCM). CCM is enforced by setting the MODE bit to "1" in the I²C register; no external pin or resistor forces PWM-only operation.
How is I²C address selected on MP8864GQ-Z?
I²C address is selected via the ADD pin (Pin 7): floating or pulled to VCC selects address 0x60; pulled to GND selects address 0x61. Both addresses support full 3.4 Mbps high-speed mode. No external pull-up resistors are required on SDA/SCL beyond standard bus termination (typically 2.2 kΩ to 3.3 V).
Can MP8864GQ-Z regulate output voltage without external feedback resistors?
Yes. When FB is tied to VCC, MP8864GQ-Z starts up to a default 0.9 V output. In I²C control mode (V_BOOT = 0), regulation uses direct VOUT sensing - eliminating external resistors entirely. This simplifies layout and avoids resistor tolerance errors in precision core rail applications.
What is the maximum allowable BST capacitor voltage rating?
The BST capacitor must withstand ≥12 V rating. During startup, VBST–VSW can reach up to 5 V, but VBST itself may swing near VIN + 5 V (e.g., 26 V max with 21 V input). A 16 V X5R or X7R ceramic capacitor (e.g., 0.1 µF) is recommended; 10 V parts risk breakdown under worst-case transient conditions.
Is the PG pin active during thermal shutdown?
Yes. PG is pulled low immediately upon thermal shutdown (TSD) activation, independent of the 80 µs deglitch timer. This provides instantaneous fault indication to the host system. PG remains low until die temperature falls below the hysteresis threshold (~140°C) and output regulation resumes.
Does MP8864GQ-Z require external compensation components?
No. MP8864GQ-Z features an internally compensated error amplifier optimized for typical 1 µH inductors and 47 µF output capacitance. External compensation is not supported or required - simplifying design, reducing BOM, and improving consistency across production units.
MP8864GQ-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 15-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Programmable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 4.5V
- Voltage - Input (Max):
- 21V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.2V
- Current - Output:
- 4A
- Frequency - Switching:
- 600kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 15-QFN (3x3)
MP8864GQ-Z FAQ
1.How can I place an order for MP8864GQ-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP8864GQ-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 MP8864GQ-Z reliable?
The price and inventory of MP8864GQ-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP8864GQ-Z is usually 5 days.
3.What payment methods are accepted for MP8864GQ-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP8864GQ-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP8864GQ-Z?
MP8864GQ-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP8864GQ-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 MP8864GQ-Z?
For technical support, including MP8864GQ-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP8864GQ-Z requirements.
6.How does Aetrix verify that MP8864GQ-Z is sourced from the original manufacturer or authorized distributors?
All MP8864GQ-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 MP8864GQ-Z meets industry standards.
7.What is the process for return or replacement of MP8864GQ-Z?
All MP8864GQ-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP8864GQ-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 MP8864GQ-Z part is unused and in its original packaging.
Return procedure for MP8864GQ-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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