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Monolithic Power Systems Inc. MP8865GQ-P
- Part No.:
- MP8865GQ-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 15-PowerVFQFN
- Datasheet:
-
MP8865GQ-P.pdf
- Description:
- IC REG BUCK PROG 6A 15QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,365
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Product details
Overview
MP8865GQ-P from Monolithic Power Systems is a high-efficiency, 6A, 21V synchronous step-down converter with integrated 45mΩ/18mΩ MOSFETs and I²C interface for real-time output voltage control (0.6V–1.87V in 10mV steps), 600kHz default switching frequency, and power-good indication. It delivers precise 1% VOUT accuracy and operates across 4.5V–21V input for SoC core rail regulation in media processors.
For engineers reviewing the MP8865GQ-P datasheet, MP8865GQ-P pinout, MP8865GQ-P application, or MP8865GQ-P equivalent, key selection criteria include I²C-programmable slew rate, hiccup-mode OCP, thermal shutdown at 160°C, and QFN-15 3mm×3mm package layout requirements for PGND/AGND separation and BST capacitor routing.
Technical Context
The MP8865GQ-P implements current-mode control with fast transient response and supports three operating modes-AAM (light-load pulse-skipping), DCM, and forced CCM-selected via I²C register. Its internal 5V LDO powers control circuitry across full VIN range and enables operation down to 4.5V input.
I²C interface operates at up to 3.4Mbps (high-speed mode) with dual slave addresses set by ADD pin, supporting dynamic VREF scaling, switching frequency selection, power-saving mode enable, and real-time fault status readback-including PG bit mirroring the open-drain PG pin behavior.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 21V - Supports wide industrial and computing input rails including 5V, 12V, and 19V adapters. |
| Continuous Output Current | 6A - Delivers full rated load without derating at TA = 25°C with proper PCB copper area and thermal vias. |
| Feedback Reference Accuracy | ±1% (588–612mV) - Ensures tight output regulation across –40°C to +125°C junction temperature range. |
| I²C Interface Speed | Up to 3.4Mbps - Enables rapid voltage transitions (e.g., CPU DVFS sequencing) with sub-100μs command latency. |
| Switching Frequency | Default 600kHz, programmable via I²C - Balances efficiency vs. size; allows synchronization to external clock (300kHz–2MHz). |
| Thermal Shutdown Threshold | 160°C with 20°C hysteresis - Protects die during sustained overload; automatic recovery at ≤140°C. |
| Power Good Delay | 80μs deglitch time - Prevents false toggling during output ripple or transient undershoot events. |
Pinout & Package
MP8865GQ-P is housed in a thermally enhanced QFN-15 (3mm × 3mm, 0.5mm pitch) package with exposed thermal pad. Pin 1 is marked by dot; top-side marking includes "AGL" product code, year code "Y", and lot code "LLL".
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Primary input supply rail | Accepts 4.5V–21V; requires low-ESR ceramic input capacitor and wide PCB trace to minimize voltage drop and EMI. |
| PGND (Pins 2,8) | Power ground reference | Return path for high-current SW node; must be connected to system GND with multiple vias under thermal pad. |
| EN/SYNC (Pin 3) | Enable and external clock sync input | Pulled low internally; accepts 300kHz–2MHz external clock for synchronization or logic-high enable signal. |
| PG (Pin 4) | Open-drain power-good indicator | Sinks current when VFB < 70% of target; requires external pull-up (e.g., 100kΩ to VCC) for logic-level signaling. |
| SDA / SCL (Pins 5,6) | I²C bidirectional data/clock | Support HS-mode (3.4Mbps); bus voltage 3.0–3.6V; ADD pin selects between two slave addresses. |
| ADD (Pin 7) | I²C address configuration | Floating or pulled to VCC → address 0x60; pulled to GND → address 0x61 - enables multi-device bus sharing. |
| SW (Pin 9) | Switch node output | Connects to external inductor; high di/dt node requiring minimized loop area and guard ring to reduce EMI. |
| BST (Pin 10) | Bootstrap supply for high-side driver | Requires 10Ω resistor + 0.1μF ceramic capacitor between BST and SW to sustain gate drive above VIN. |
| VOUT (Pin 11) | I²C voltage sense input | Used only in I²C control mode (V_BOOT=0); connects directly to regulated output for closed-loop sensing. |
| FB (Pin 12) | Feedback input for resistor-divider regulation | Connects to divider tap; pulling FB to VCC sets default 0.9V startup; disables I²C VOUT control when active. |
| SS (Pin 13) | Soft-start timing capacitor | 12μA internal current source charges external cap; SS time = (CSS × VREF) / 12μA - prevents inrush current. |
| VCC (Pin 14) | Internal 5V LDO output | Supplies internal circuitry; decoupled with 0.22μF ceramic cap; drops below 5V if VIN < 5V. |
| AGND (Pin 15) | Analog ground reference | Not internally connected to PGND; must be tied to system GND at single point near FB/SS pins to avoid noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| I²C-programmable output voltage | 0.6V–1.87V in 10mV steps with configurable slew rate - enables dynamic voltage scaling for CPU/GPU DVFS without external DAC. |
| Three-mode operation control | AAM, DCM, and forced CCM selectable via I²C MODE bit - optimizes light-load efficiency while maintaining stability under full load. |
| Hiccup-mode over-current protection | Enters periodic restart on sustained short-circuit - limits average power dissipation and prevents thermal runaway during fault conditions. |
| Dual feedback paths | Hardware FB loop (resistor divider) and I²C VOUT-sense loop - provides redundancy and flexibility for startup vs. runtime control strategies. |
| Integrated bootstrap charging | Internal regulator maintains ≥2.2V BST–SW voltage with 150mV hysteresis - eliminates need for external charge pump in compact designs. |
Applications
| Mobile SoC Core Rail | AI Accelerator Module |
|---|---|
Use Scenario: Powering ARM Cortex-A7x or RISC-V application processor cores requiring dynamic voltage/frequency scaling (DVFS) during burst workloads. IC Role / Device Role / Timing Role: Primary buck regulator delivering 0.8V–1.2V at up to 6A with sub-100μs I²C voltage transition for real-time performance state changes. Use Value: Eliminates need for external PMIC or digital potentiometer; reduces BOM count by integrating MOSFETs, I²C interface, and PG monitoring. | Use Scenario: Supplying configurable voltage to edge AI inference accelerators (e.g., NPU or DSP) with varying precision modes (INT8/FP16). IC Role / Device Role / Timing Role: Adaptive power stage synchronized to host processor commands via I²C to match computational load and thermal envelope. Use Value: Achieves >92% peak efficiency at 1.0V/4A while enabling firmware-controlled voltage ramping to prevent output overshoot during mode switches. |
| Industrial Camera Sensor Array | 5G Small Cell Baseband |
Use Scenario: Providing clean, low-noise 1.8V bias to high-resolution CMOS image sensors with strict PSRR and transient response requirements. IC Role / Device Role / Timing Role: Secondary buck stage downstream of primary 12V rail; uses CCM mode and tight 1% VREF to maintain sensor analog performance. Use Value: Delivers <10mV output deviation under 3A step load (50ns rise time) due to current-mode control and integrated compensation. | Use Scenario: Generating 1.1V core supply for 5G NR baseband processors operating in thermally constrained outdoor enclosures. IC Role / Device Role / Timing Role: High-reliability DC/DC converter with thermal shutdown (160°C) and hiccup OCP to sustain operation during ambient spikes up to 85°C. Use Value: Maintains stable output under 100% load at 70°C ambient using standard 4-layer PCB with 2oz copper and 8 thermal vias under QFN pad. |
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 |
|---|---|---|---|
| MP8859GQ-Z | 4A rating, same 4.5V–21V input, I²C interface, but no VOUT sense pin (FB-only control) | Lacks dual-loop flexibility; unsuitable for systems requiring runtime VOUT reconfiguration without hardware change | Select when cost sensitivity outweighs need for I²C VOUT sensing and full 6A capability is unnecessary |
| TPS546B24RVFT | PMBus-compatible, 6A, 4.5V–18V, integrated FETs, but larger 4mm×4mm QFN and higher quiescent current (1.2mA vs. 760μA) | Requires PMBus protocol stack; lacks hiccup-mode OCP and has slower I²C-equivalent command latency | Prefer when existing design uses TI PMBus ecosystem or needs telemetry registers beyond voltage scaling |
Compared with MP8865GQ-P, MP8859GQ-Z trades current capacity and dual-loop control for lower unit cost, while TPS546B24RVFT adds telemetry depth at the expense of thermal density and startup simplicity - making MP8865GQ-P optimal for space-constrained, I²C-native DVFS systems needing robust fault handling.
Availability
MP8865GQ-P is available at Aetrix Electronics and suitable for mobile SoC power delivery, AI accelerator modules, and industrial camera sensor arrays requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP8865GQ-P 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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP8865 belongs to MPS's I²C-programmable DC/DC converter product line, engineered specifically for dynamic voltage scaling in compute-intensive applications where firmware-controlled power states replace fixed-voltage rails.
FAQ
What is the minimum recommended soft-start capacitor value for MP8865GQ-P?
The soft-start capacitor (SS pin) is charged by a 12μA internal current source. For a typical 5ms soft-start time at VREF = 600mV, use CSS = (5ms × 12μA) / 0.6V ≈ 100nF. Larger values (e.g., 220nF) extend ramp time to avoid inrush current into high-capacitance output banks, especially during pre-biased start-up.
Can MP8865GQ-P operate without I²C communication after power-up?
Yes. If no I²C commands are received post-enable, MP8865GQ-P defaults to FB-resistor-divider regulation (e.g., 0.9V if FB tied to VCC) and functions as a standard buck converter. I²C remains active but idle; all protections and modes remain fully operational without bus traffic.
How does the ADD pin affect I²C addressing on MP8865GQ-P?
The ADD pin selects between two I²C slave addresses: floating or pulled to VCC configures address 0x60; pulled to GND configures address 0x61. This allows two MP8865GQ-P devices on the same bus - essential for multi-rail systems like DDR memory termination and core voltage sequencing.
What is the maximum allowable BST–SW voltage, and how is it enforced?
The BST–SW voltage is internally clamped to 5V ±5%. If (VBST – VSW) exceeds 5.25V, an internal regulator activates to sink excess current from the BST capacitor. A 10Ω resistor between SW and BST is recommended to damp ringing and limit peak BST voltage during high di/dt switching transitions.
Does MP8865GQ-P provide over-voltage protection (OVP) that pulls PG low?
No. OVP triggers LS-FET conduction to discharge the output but does not assert the PG pin. PG responds only to undervoltage (VFB < 70% of target), UVLO, thermal shutdown, or over-current faults - not over-voltage events. The PG bit in the I²C register mirrors this behavior exactly.
Is AGND required to be connected externally, and why?
Yes. AGND (Pin 15) is not internally bonded to PGND. It must be connected to system ground at a single point near FB and SS pins to prevent noise from high-current PGND paths from corrupting the error amplifier reference. Failure to isolate AGND causes output voltage drift and instability in precision regulation.
MP8865GQ-P 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):
- 1.87V
- Current - Output:
- 6A
- 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)
MP8865GQ-P FAQ
1.How can I place an order for MP8865GQ-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP8865GQ-P 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 MP8865GQ-P reliable?
The price and inventory of MP8865GQ-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP8865GQ-P is usually 5 days.
3.What payment methods are accepted for MP8865GQ-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP8865GQ-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP8865GQ-P?
MP8865GQ-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP8865GQ-P 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 MP8865GQ-P?
For technical support, including MP8865GQ-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP8865GQ-P requirements.
6.How does Aetrix verify that MP8865GQ-P is sourced from the original manufacturer or authorized distributors?
All MP8865GQ-P 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 MP8865GQ-P meets industry standards.
7.What is the process for return or replacement of MP8865GQ-P?
All MP8865GQ-P units undergo pre-shipment inspection (PSI). If there is an issue with MP8865GQ-P, 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 MP8865GQ-P part is unused and in its original packaging.
Return procedure for MP8865GQ-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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