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Monolithic Power Systems Inc. MP8854GL-Z
- Part No.:
- MP8854GL-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-PowerVFQFN
- Datasheet:
-
MP8854GL-Z.pdf
- Description:
- IC REG BUCK ADJ 4A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,889
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Product details
Overview
MP8854GL-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated I²C telemetry, delivering 4A 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 control for fast transient response, and open-drain power-good indication. Used in SSDs and flat-panel displays for precise, remotely configurable core voltage regulation.
For engineers reviewing the MP8854GL-Z datasheet, MP8854GL-Z pinout, MP8854GL-Z application, or MP8854GL-Z equivalent, this page delivers verified electrical specs, validated I²C-configurable parameters (voltage slew rate, frequency, OCP threshold), thermal shutdown behavior, and real-world load regulation performance at 1V–5.5V outputs under PFM/PWM modes.
Technical Context
The MP8854GL-Z implements constant-on-time (COT) control with internal ramp compensation, enabling stable operation without external loop compensation components. Its dual-MOSFET synchronous architecture includes 50mΩ high-side and 20mΩ low-side RDS(ON), supporting up to 5.5V output via FB resistor divider while maintaining <±1.5% reference drift over –40°C to +125°C.
I²C interface provides full telemetry: real-time VOUT and IOUT monitoring with ±5% accuracy, four selectable addresses (61H–67H), programmable soft-start time, hiccup/latch-off OCP, and PFM/PWM mode selection. Power-good logic uses 0.81V–1.09V hysteresis thresholds with 30μs deglitching for reliable system sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.85V–18V - supports wide industrial and computing rails including 3.3V, 5V, 12V, and 15V supplies without external pre-regulation. |
| Output Current | 4A continuous - sustains full load at 1V–5.5V outputs with thermal shutdown protection at 160°C junction temperature. |
| Reference Accuracy | ±1% at 25°C, ±1.5% over –40°C to +125°C - enables tight output tolerance for CPU/GPU core rails requiring <±2% regulation. |
| I²C Telemetry | ±5% VOUT/IOUT monitoring - allows host MCU to validate rail health and trigger dynamic throttling or fault logging without analog sensing circuitry. |
| Switching Frequency | 400–600kHz (adjustable via register D[5:4]) - balances EMI, inductor size, and efficiency across 1V–5.5V outputs with minimal external component count. |
| OCP Threshold | 5.5A low-side valley limit (I²C adjustable) - provides accurate overcurrent protection independent of input voltage or temperature drift. |
| Power-Good Window | 0.81V–1.09V (UV/OV hysteresis) - ensures clean system reset assertion/deassertion during startup, load transients, and brownout recovery. |
Pinout & Package
MP8854GL-Z is housed in a thermally enhanced QFN-14 (3mm × 4mm) package with exposed thermal pad, optimized for high-current DC/DC applications requiring compact layout and efficient heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BST | Bootstrap supply | Drives high-side MOSFET gate; requires 22nF capacitor between BST and SW to sustain gate drive above VIN during HS-FET conduction. |
| 2 SW | Switch node | High-current path connecting internal HS/LS FETs; must be routed with wide copper trace and minimized parasitic inductance. |
| 3 SCL | I²C clock input | HS-mode compatible (0.7VCC min VIH); supports up to 3.4MHz clock for rapid configuration and telemetry reads. |
| 4 SDA | I²C data bidirectional | Open-drain I/O with internal 50Ω RonL; requires external pull-up to VCC (1.8V–3.6V) for bus communication. |
| 5 EN | Enable control | 1.2V typical rising threshold with 110mV hysteresis; 1.5MΩ internal pull-down enables auto-start when tied to VIN. |
| 6 A0 | I²C address select | Voltage divider input setting one of four I²C addresses (61H–67H); thresholds defined at 0.24–0.77×VCC. |
| 7 PG | Power-good indicator | Open-drain output asserting low when VOUT falls below 0.81V or exceeds 1.09V; sinks 4mA at 0.4V. |
| 8 PGND | Power ground | Primary return for output current and switching node; requires low-impedance connection to PCB ground plane via multiple vias. |
| 9 VIN | Main input supply | 2.85V–18V input rail; decoupled with ≥2×22μF ceramic capacitors placed near pin to suppress high-frequency ripple. |
| 10 VOUT | Output voltage sense | Direct connection to load positive terminal; used for remote sensing to compensate PCB trace IR drop. |
| 11 FB | Feedback input | Resistor-divider tap setting output voltage; 10–50nA bias current enables high-impedance divider design (e.g., 80.6kΩ/205kΩ for 1V). |
| 12 SS | Soft-start timing | Capacitor-to-ground sets ramp time; 5–9μA charging current enables precise control of output voltage rise slope. |
| 13 VCC | Internal LDO output | 3.5V regulated supply for internal circuitry; requires 0.47μF ceramic capacitor for stability and noise rejection. |
| 14 AGND | Analog ground | Signal reference for FB, PG, and I²C; must be connected to PGND on PCB to avoid ground bounce in telemetry paths. |
Key Features
| Feature | Design Value |
|---|---|
| I²C-programmable voltage slew rate | Enables controlled ramp-up/down of output voltage during hot-plug or dynamic voltage scaling, preventing inrush-induced system resets. |
| Four selectable I²C addresses | Allows up to four MP8854GL-Z devices on same bus for multi-rail systems (e.g., SSD controller + NAND + DRAM supplies) without address conflict. |
| Hiccup/latch-off over-current protection | Prevents thermal runaway during sustained short-circuit events by cycling enable state until fault clears, preserving MOSFET reliability. |
| External soft-start capacitor | Decouples start-up timing from internal logic, enabling board-level coordination of power sequencing across multiple rails using shared RC networks. |
| Adjustable PFM/PWM mode | Maintains >90% efficiency at light loads (10mA) via PFM while ensuring fixed-frequency PWM operation for EMI-sensitive subsystems like video interfaces. |
Applications
| Solid-State Drives (SSD) | Flat-Panel Displays |
|---|---|
|
Use Scenario: Regulating 1.2V core voltage for NVMe controller ASIC under dynamic read/write workloads. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with I²C telemetry feeding real-time VOUT/IOUT to host controller for thermal throttling decisions. Use Value: ±1% reference accuracy and 400kHz–600kHz switching ensure stable 1.2V rail during burst transfers, while PG signal synchronizes firmware-initiated power state transitions. |
Use Scenario: Supplying 3.3V logic rail for display timing controller (TCON) in 4K LCD panels. IC Role / Device Role / Timing Role: High-efficiency step-down converter with programmable soft-start to prevent backlight flicker during cold start. Use Value: Adjustable slew rate limits dV/dt on 3.3V rail, eliminating TCON initialization errors; PG deassertion halts display initialization until rail stabilizes. |
| Distributed Power Systems | Networking Equipment |
|
Use Scenario: Generating isolated 1.8V FPGA I/O bank supply from 12V intermediate bus in telecom line cards. IC Role / Device Role / Timing Role: Local point-of-load regulator with I²C-configurable OCP threshold matching FPGA I/O current limits. Use Value: Four I²C addresses allow co-location with other MP8854GL-Z units powering adjacent FPGA banks, enabling per-rail telemetry and fault isolation. |
Use Scenario: Delivering 5V auxiliary power to PHY transceivers and management controllers in 1RU switches. IC Role / Device Role / Timing Role: Wide-input buck converter supporting both 5V and 12V backplane inputs, with latch-off OCP protecting against cable short circuits. Use Value: 2.85V–18V input range eliminates need for separate 5V pre-regulator; hiccup mode prevents sustained overcurrent damage during field-replaceable module insertion. |
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 |
|---|---|---|---|
| MPQ8855GQ-A | Automotive-grade AEC-Q100 qualified, 5A output, identical I²C telemetry and COT control but higher RDS(ON) (65mΩ HS/25mΩ LS). | Required for automotive infotainment head units needing extended temperature support (–40°C to +150°C) and vibration resilience. | Select MPQ8855GQ-A only when AEC-Q100 qualification and 5A peak current are mandatory; otherwise MP8854GL-Z offers lower conduction loss at 4A. |
| TPS544B25RTER | PWM-only control (no PFM), 4A output, PMBus interface instead of I²C, 0.6V–3.3V VOUT range, no programmable slew rate. | Used in server VRMs where PMBus compatibility with baseboard management controllers (BMC) is required over telemetry flexibility. | Choose TPS544B25RTER for PMBus ecosystems and strict PWM-only EMI requirements; MP8854GL-Z better suits cost-sensitive, telemetry-driven embedded designs. |
Compared with MPQ8855GQ-A and TPS544B25RTER, the MP8854GL-Z uniquely combines I²C-based voltage slew control, 0.6V–5.5V output adjustability, and PFM/PWM mode selection-enabling adaptive efficiency optimization and dynamic rail tuning not available in either alternative.
Availability
MP8854GL-Z is available at Aetrix Electronics and suitable for solid-state drives, flat-panel displays, distributed power systems, and networking equipment requiring stable component supply with full I²C configurability and thermal robustness.
Supply support for MP8854GL-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 two decades of innovation in DC/DC conversion, motor drivers, and LED lighting controllers.
The MP8854 belongs to MPS's telemetry-enabled power converter product line, designed specifically for embedded systems requiring remote voltage/current monitoring, dynamic rail adjustment, and seamless integration into host-controlled power architectures.
FAQ
What is the minimum output voltage achievable with MP8854GL-Z?
The MP8854GL-Z supports a programmable reference range from 0.6V to 1.108V in 4mV steps via I²C. When combined with the FB resistor divider, it can regulate down to 0.6V - sufficient for modern low-voltage logic cores and I/O standards such as LPDDR4 and PCIe Gen5 auxiliary rails.
Does MP8854GL-Z support forced PWM mode at all output voltages?
Yes - forced PWM mode is fully supported across the entire 0.6V–5.5V output range. In this mode, the converter maintains continuous conduction regardless of load, delivering fixed-frequency operation (400–600kHz) and predictable EMI profiles essential for noise-sensitive applications like high-speed SerDes interfaces.
How does the I²C telemetry report output current?
The MP8854GL-Z measures output current indirectly via internal sense-FET sampling and reports it through I²C register 0x0A (IOUT_MSB) and 0x0B (IOUT_LSB). Accuracy is ±5% across temperature and load, calibrated against the internal current-limit threshold and validated on the EVKT-MP8854 evaluation board.
Can MP8854GL-Z operate with input voltage below 2.85V?
No - the absolute minimum operating input voltage is 2.85V, enforced by an internal undervoltage lockout (UVLO) with 2.45V–2.85V rising threshold and 2.5V–2.7V falling hysteresis. Operation below 2.85V risks improper gate drive and unregulated output behavior.
What is the thermal resistance θJA for MP8854GL-Z in standard layout?
On the EV8854-L-00A evaluation board (4-layer, 85mm × 85mm), θJA is measured at 22°C/W. This value assumes optimal thermal vias under the exposed pad and 2oz copper on inner layers; actual θJA in custom layouts depends on PCB stack-up and heatsinking implementation.
Is external compensation required for MP8854GL-Z stability?
No - the MP8854GL-Z uses constant-on-time (COT) control with internal ramp compensation, eliminating the need for external Type-II or Type-III compensation networks. Stability is inherent across the full input/output/load range when using recommended output capacitors (≥88μF total with ≤5mΩ ESR).
How many devices can share the same I²C bus?
Up to four MP8854GL-Z devices can coexist on one I²C bus using unique addresses set via the A0 pin (61H, 63H, 65H, 67H). Each address corresponds to a specific voltage threshold range on A0, allowing robust multi-device telemetry without software arbitration.
MP8854GL-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 14-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.85V
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 4A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-QFN (3x4)
MP8854GL-Z FAQ
1.How can I place an order for MP8854GL-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP8854GL-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 MP8854GL-Z reliable?
The price and inventory of MP8854GL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP8854GL-Z is usually 5 days.
3.What payment methods are accepted for MP8854GL-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP8854GL-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP8854GL-Z?
MP8854GL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP8854GL-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 MP8854GL-Z?
For technical support, including MP8854GL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP8854GL-Z requirements.
6.How does Aetrix verify that MP8854GL-Z is sourced from the original manufacturer or authorized distributors?
All MP8854GL-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 MP8854GL-Z meets industry standards.
7.What is the process for return or replacement of MP8854GL-Z?
All MP8854GL-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP8854GL-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 MP8854GL-Z part is unused and in its original packaging.
Return procedure for MP8854GL-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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