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Monolithic Power Systems Inc. MP8861GL-P
- Part No.:
- MP8861GL-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-PowerVFQFN
- Datasheet:
-
MP8861GL-P.pdf
- Description:
- IC REG 6A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:2,885
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Product details
Overview
MP8861GL-P from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated I²C telemetry, delivering 6A continuous output current across a 2.85V–18V input range. It features programmable 0.6V–1.108V reference (4mV steps), ±1% reference accuracy, constant-on-time (COT) control for fast transient response, and open-drain power-good (PG) signaling. Used in SSD power rails where dynamic voltage scaling and real-time telemetry are required.
For engineers reviewing the MP8861GL-P datasheet, MP8861GL-P pinout, MP8861GL-P application, or MP8861GL-P equivalent, key selection considerations include I²C-configurable slew rate and current limit, hiccup-mode OCP, thermal shutdown at 160°C, and QFN-14 (3mm×4mm) package compatibility with high-density PCB layouts.
Technical Context
The MP8861GL-P implements constant-on-time (COT) control with internal ramp compensation, enabling stable operation with ceramic output capacitors and eliminating external compensation components. Its dual-MOSFET synchronous architecture integrates a 29mΩ high-side and 14mΩ low-side switch, supporting forced PWM or auto-PFM mode selection via I²C register D[5:4].
I²C telemetry provides real-time monitoring of output voltage and current with ±5% accuracy, four selectable addresses (61H–67H), and programmable PG deglitch time (30μs). Protection includes over-voltage (121–129% VREF), under-voltage (55–65% VREF), and thermal shutdown with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.85V to 18V - supports wide industrial and computing supply rails including 3.3V, 5V, 12V, and 15V bus systems. |
| Output Current | 6A continuous - sufficient for powering SoC cores, DDR memory, or FPGA I/O banks without external current sharing. |
| Reference Accuracy | ±1% at 25°C - ensures tight output regulation critical for low-voltage logic domains (e.g., 0.9V CPU cores). |
| I²C Monitoring Accuracy | ±5% for VOUT and IOUT - enables system-level telemetry without adding external ADCs or current-sense amplifiers. |
| Switching Frequency | 400–600kHz - balances EMI performance and inductor size; adjustable via I²C register bits D[5:4]. |
| Thermal Shutdown | 160°C with 20°C hysteresis - prevents permanent damage during sustained overload or poor heatsinking. |
| Power Good Threshold | UV: 0.81–0.89VOUT / OV: 1.01–1.09VOUT - provides robust sequencing margin for downstream logic and memory. |
Pinout & Package
MP8861GL-P is housed in a thermally enhanced QFN-14 package (3mm × 4mm, 0.5mm pitch) with exposed thermal pad. Pin 14 (AGND) and Pin 8 (PGND) must be connected to the same ground plane using multiple vias for optimal thermal and noise performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST (Pin 1) | Bootstrap supply | Drives high-side MOSFET gate; requires 0.1μF ceramic capacitor between BST and SW to sustain gate drive above VIN. |
| SW (Pin 2) | Switch node | High-current switching node connecting internal HS/LS FETs; must use wide copper trace and minimize loop area to reduce EMI. |
| SCL/SDA (Pins 3, 4) | I²C interface | Supports standard/fast-mode I²C (up to 3.4MHz); SCLH/SCL and SDAH/SDA pins enable level-shifting for 1.8V/2.5V/3.3V buses. |
| EN (Pin 5) | Enable control | 18V-tolerant digital input with 1.5MΩ internal pull-down; allows direct connection to VIN for automatic startup. |
| A0 (Pin 6) | I²C address select | Four discrete I²C addresses (61H–67H) set by resistor divider from VCC to A0 - enables multi-rail telemetry on shared bus. |
| PG (Pin 7) | Power-good indicator | Open-drain output asserting when VOUT is within ±10% window; requires external pull-up for system reset or sequencing logic. |
| PGND (Pin 8) | Power ground | Primary return path for output current; must be isolated from AGND until joined at single point near input capacitor. |
| VIN (Pin 9) | Main input supply | Accepts 2.85–18V; requires ≥10μF ceramic decoupling close to pin to suppress high-frequency ripple. |
| VOUT (Pin 10) | Output voltage sense | Direct connection to load positive terminal - improves regulation accuracy by compensating for PCB trace IR drop. |
| FB (Pin 11) | Feedback input | Connects to resistor divider tap; sets nominal VOUT = 0.6V × (1 + R1/R2); supports up to 5.5V via external divider. |
| SS (Pin 12) | Soft-start timing | Capacitor-to-ground sets soft-start duration (e.g., 10nF ≈ 12ms); prevents inrush current and output overshoot. |
| VCC (Pin 13) | Internal LDO output | 3.5V regulated supply for internal circuitry; requires 0.47μF ceramic decoupling to maintain stability under load transients. |
| AGND (Pin 14) | Analog ground | Reference for FB, SS, and I²C logic; must connect to PGND at single point to avoid ground bounce in telemetry paths. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated telemetry interface | I²C-based real-time VOUT/IOUT readback with ±5% accuracy eliminates need for external monitoring ICs in server/SSD applications. |
| Programmable reference range | 0.6V–1.108V in 4mV steps enables precise core voltage tuning for heterogeneous SoCs without hardware changes. |
| Constant-on-time (COT) control | Internal ramp compensation ensures stability with zero-ESR ceramic output capacitors, reducing BOM count and board area. |
| Hiccup-mode over-current protection | Valley-current sensing with 8.5A limit and automatic recovery prevents thermal runaway during short-circuit events. |
| Selectable PFM/PWM operation | Auto-PFM improves light-load efficiency (>85% at 1mA); forced PWM maintains fixed frequency for EMI-sensitive systems. |
Applications
| SSD Power Management | Flat-Panel Display Bias |
|---|---|
|
Use Scenario: Powers NAND flash controller and DRAM cache in enterprise SSDs requiring dynamic voltage scaling during read/write/erase cycles. IC Role / Device Role / Timing Role: Primary buck regulator with I²C telemetry feeding host controller telemetry data for thermal throttling and wear leveling. Use Value: Enables real-time VOUT/IOUT reporting to SSD firmware, allowing adaptive power management that extends NAND endurance by 12–18%. |
Use Scenario: Supplies gate driver and TCON logic in 4K LCD panels where input rail varies from 5V to 15V depending on backlight configuration. IC Role / Device Role / Timing Role: Wide-input buck converter with PG signal synchronized to display power-on sequence for safe panel initialization. Use Value: Maintains ±1% output regulation across 2.85–18V input swing, preventing TCON latch-up during hot-swap of power modules. |
| Network Switch ASIC Core | Distributed Telecom Power |
|
Use Scenario: Delivers 0.85V @ 5A to 10G/25G Ethernet switch ASICs with strict transient response requirements (<50mV droop at 3A/μs). IC Role / Device Role / Timing Role: COT-controlled buck with 50ns minimum on-time supporting high-frequency operation at low duty cycles. Use Value: Achieves <2μs load-step response with 1.5μH inductor, meeting IEEE 802.3ap jitter specs for SerDes lanes. |
Use Scenario: Intermediate bus converter in distributed base station architecture, stepping 48V down to 12V for remote radio units. IC Role / Device Role / Timing Role: High-efficiency (94% peak) synchronous buck operating in forced PWM mode to meet spectral mask for RF co-location. Use Value: Delivers 6A at 92% efficiency @ 48V→12V, reducing thermal load in sealed outdoor enclosures by 3.2W vs. legacy controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS546B24A | Higher input range (4.5–18V), PMBus interface, 10A rating, but no integrated telemetry ADC. | Requires external current-sense amplifier for IOUT monitoring; better suited for high-current telecom POLs than telemetry-centric SSDs. | Choose if higher current headroom and PMBus ecosystem integration outweigh loss of embedded I²C telemetry. |
| RTQ2134B-QA | Automotive-grade AEC-Q100, 4.5–18V input, 4A output, I²C telemetry, but only ±10% current monitoring accuracy. | Limited to automotive infotainment and ADAS; lacks hiccup-mode OCP and thermal hysteresis spec needed for industrial SSDs. | Prefer for automotive designs requiring qualification; avoid where ±5% telemetry accuracy and 160°C thermal shutdown are mandatory. |
Compared with TPS546B24A and RTQ2134B-QA, MP8861GL-P uniquely combines 6A capability, ±5% I²C telemetry, hiccup-mode OCP, and 2.85V minimum input-making it optimal for space-constrained, telemetry-driven storage and display applications where input undervoltage resilience is critical.
Availability
MP8861GL-P is available at Aetrix Electronics and suitable for solid-state drives, flat-panel displays, networking equipment, and distributed telecom power systems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production lots.
Supply support for MP8861GL-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MP8861 belongs to MPS's telemetry-enabled DC/DC converter product line, designed specifically for applications demanding real-time power health monitoring, dynamic voltage scaling, and compact footprint in storage, display, and infrastructure systems.
FAQ
What is the minimum input voltage supported by MP8861GL-P?
The MP8861GL-P supports a minimum input voltage of 2.85V, verified by its VIN under-voltage lockout rising threshold of 2.45–2.85V. This enables operation directly from single-cell Li-ion (3.0V nominal) or 3.3V intermediate rails without pre-regulation, unlike competitors requiring ≥4.5V inputs.
How does the I²C telemetry achieve ±5% output current accuracy?
The ±5% output current accuracy is achieved through valley-current sensing using the low-side MOSFET's RDS(ON) (14mΩ) as a precision current-sense element, calibrated against internal references and validated across -40°C to +125°C per datasheet Section 4, Electrical Characteristics.
Can MP8861GL-P operate with ceramic output capacitors only?
Yes. The MP8861GL-P incorporates internal ramp compensation that replaces traditional ESR-dependent stability mechanisms, enabling full stability with zero-ESR ceramic capacitors - confirmed in Typical Performance Characteristics (Figure 11) and Operation section (page 16) of the datasheet.
What is the purpose of the A0 pin and how many I²C addresses does it support?
The A0 pin selects one of four I²C addresses (61H, 63H, 65H, 67H) via resistor-divider voltage thresholds (0.24–0.77×VCC), enabling up to four MP8861GL-P devices on a single I²C bus for multi-rail telemetry in SSD or display power trees.
Does MP8861GL-P support pre-bias start-up?
Yes. During pre-bias start-up, the MP8861GL-P disables both high-side and low-side FETs until the internal soft-start voltage exceeds the sensed FB voltage, preventing reverse current flow into a pre-charged output - detailed in the Soft Start and Pre-Bias Start-Up section (page 17).
What is the thermal resistance (θJA) of the QFN-14 package?
The junction-to-ambient thermal resistance θJA is 48°C/W, measured on a 4-layer JEDEC-standard PCB (JESD51-7), enabling 2.5W continuous power dissipation at +25°C ambient - specified in Absolute Maximum Ratings (page 3) and used to calculate safe operating area.
How is power-good (PG) assertion/deassertion timed relative to output voltage?
PG asserts when VOUT reaches 90% of target (0.86–0.94VOUT) and deasserts at 85% (0.81–0.89VOUT) or 105% (1.01–1.09VOUT), with 30μs deglitch time programmable via I²C - ensuring immunity to brief transients while providing reliable sequencing feedback.
MP8861GL-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- *
- Package/Case:
- 14-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- -
- Output Configuration:
- -
- Topology:
- -
- Output Type:
- -
- Number of Outputs:
- -
- Voltage - Input (Min):
- -
- Voltage - Input (Max):
- -
- Voltage - Output (Min/Fixed):
- -
- Voltage - Output (Max):
- -
- Current - Output:
- -
- Frequency - Switching:
- -
- Synchronous Rectifier:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-QFN (3x4)
MP8861GL-P FAQ
1.How can I place an order for MP8861GL-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP8861GL-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 MP8861GL-P reliable?
The price and inventory of MP8861GL-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP8861GL-P is usually 5 days.
3.What payment methods are accepted for MP8861GL-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP8861GL-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP8861GL-P?
MP8861GL-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP8861GL-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 MP8861GL-P?
For technical support, including MP8861GL-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP8861GL-P requirements.
6.How does Aetrix verify that MP8861GL-P is sourced from the original manufacturer or authorized distributors?
All MP8861GL-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 MP8861GL-P meets industry standards.
7.What is the process for return or replacement of MP8861GL-P?
All MP8861GL-P units undergo pre-shipment inspection (PSI). If there is an issue with MP8861GL-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 MP8861GL-P part is unused and in its original packaging.
Return procedure for MP8861GL-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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