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Monolithic Power Systems Inc. MP8859GQ-0000-Z
- Part No.:
- MP8859GQ-0000-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 16-PowerVFQFN
- Datasheet:
-
MP8859GQ-0000-Z.pdf
- Description:
- IC REG BUCK BOOST ADJ 3A 16QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,278
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Product details
Overview
MP8859GQ-0000-Z from Monolithic Power Systems is a synchronous 4-switch integrated buck-boost DC/DC converter with I²C interface, operating from 2.8V to 22V input and delivering up to 3A output current at 1V–20.47V programmable output voltage. It implements COT control in buck mode and COT-based constant-off-time in boost mode for fast transient response, supports USB PD sourcing ports, and integrates four low-RDS(ON) MOSFETs (25mΩ HS / 21mΩ LS) in a QFN-16 (3mm×3mm) package.
For engineers reviewing the MP8859GQ-0000-Z datasheet, MP8859GQ-0000-Z pinout, MP8859GQ-0000-Z application, or MP8859GQ-0000-Z equivalent, this device is selected for high-efficiency wide-input bus regulation where I²C-configurable output voltage (10mV resolution), adjustable CC limit, hiccup-mode OVP/SCP, and thermal warning/shutdown are required in space-constrained USB PD and industrial power systems.
Technical Context
The MP8859 operates across three distinct modes-buck (VIN > VOUT), boost (VIN < VOUT), and seamless buck-boost transition (VIN ≈ VOUT)-using a single inductor and four internal MOSFETs controlled by dual-mode timing logic. Its COT/COT-derived architecture ensures sub-10µs load transient recovery and stable regulation without external compensation.
Control is fully configurable via I²C: output voltage, soft-start time (900µs default), line-drop compensation (150mV @ 3A), PFM/PWM mode selection, OCP threshold, and EN discharge behavior are stored in one-time-programmable (OTP) memory. The ALT pin provides fault-alert signaling with open-drain logic-low assertion on OVP, SCP, or thermal warning.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 2.8V to 22V - supports direct connection to 3.3V, 5V, 12V, and 19V rails without pre-regulation. |
| Output Voltage Range | 1.000V to 20.47V in 10mV steps via I²C - enables precise USB PD profile compliance (e.g., 5V/9V/15V/20V). |
| Max Output Current | 3A continuous at VOUT ≥ 5V - sustained delivery under full thermal derating with 4-layer PCB layout. |
| Switching Frequency | 500kHz ±20% - fixed frequency operation enables predictable EMI filtering and inductor sizing. |
| Internal MOSFET RDS(ON) | 25mΩ (HS) / 21mΩ (LS) - minimizes conduction loss and improves efficiency above 85% at mid-load (1–2A). |
| I²C Interface | Up to 3.4MHz clock, 4 programmable slave addresses via ADD pin - allows multi-device bus management without address conflict. |
| Protection Features | OVP (hiccup), SCP (hiccup), UVP, OTP warning + shutdown, programmable soft-start - eliminates need for external supervision circuitry. |
Pinout & Package
MP8859GQ-0000-Z is housed in a thermally enhanced 16-pin QFN package (3mm × 3mm, 0.5mm pitch) with exposed thermal pad. Pin 1 is marked by dot; top-side marking includes "BGR" product code, year code, and lot number.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Main power input | Drain node of internal high-side buck switch; requires local 10µF+ ceramic input capacitor. |
| 2,11 GND | Power ground | Primary return path for all switching currents; must be connected to thermal pad and solid ground plane. |
| 3 EN | Enable control | Active-high logic input with 2MΩ internal pull-down; supports hardware on/off and I²C-controlled shutdown discharge. |
| 4 ADD | I²C address select | Resistor-divider input to set one of four I²C addresses (60H–66H); enables multi-device bus configuration. |
| 5 SCL | I²C clock | Open-drain input supporting up to 3.4MHz; requires external pull-up to VCC or system I²C rail. |
| 6 SDA | I²C data | Open-drain bidirectional I²C data line; shares same pull-up as SCL. |
| 7 OC | Current limit sense | Analog input setting output CC limit via external resistor; defaults to 3.5A with 21.5kΩ. |
| 8 ALT | Fault alert output | Open-drain active-low signal asserting on OVP, SCP, or thermal warning; requires external pull-up. |
| 9 VCC | Internal LDO output | 3.6V regulated supply for gate drivers and logic; decoupled with 1µF ceramic capacitor. |
| 10 AGND | Analog reference ground | Separate analog ground pin tied to GND; critical for ADC and feedback accuracy. |
| 12 OUT | Regulated output | High-current output node; requires low-ESR bulk capacitor (≥100µF) placed adjacent to OUT/GND. |
| 13 BST2 | Bootstrap supply for SW2 HS driver | Connects 100nF capacitor between BST2 and SW2 to generate floating gate drive for second high-side switch. |
| 14 SW2 | Second half-bridge switching node | Connects to one end of power inductor; carries full switching current in boost/buck-boost modes. |
| 15 SW1 | First half-bridge switching node | Connects to other end of power inductor; carries full switching current in buck/buck-boost modes. |
| 16 BST1 | Bootstrap supply for SW1 HS driver | Connects 100nF capacitor between BST1 and SW1 to generate floating gate drive for first high-side switch. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 4-switch topology | Eliminates need for external MOSFETs and gate drivers, reducing BOM count and board area by >40% vs discrete solutions. |
| I²C-programmable output voltage | 10mV resolution over 1V–20.47V range enables dynamic reconfiguration for multi-profile USB PD applications. |
| OTP non-volatile memory | Stores default register settings (5V VOUT, 3.5A CC limit, forced PWM, 900µs soft-start) - no host MCU required for basic operation. |
| Hiccup-mode protection | OVP and SCP enter auto-retry mode instead of latch-off, maintaining system availability during transient faults. |
| Thermal warning + shutdown | Alerts at 150°C (TSTD) with 20°C hysteresis, allowing host firmware to throttle load before catastrophic shutdown. |
Applications
| USB PD Sourcing Port | Buck-Boost Bus Supply |
|---|---|
|
Use Scenario: Providing programmable 5V/9V/15V/20V power to USB-C devices in portable docks, monitors, and chargers. IC Role / Device Role / Timing Role: Primary buck-boost regulator implementing USB PD contract negotiation via I²C-controlled VOUT stepping. Use Value: Enables single-chip PD sourcing without secondary microcontroller; 3A output sustains 60W delivery at 20V with <1.5% load regulation. |
Use Scenario: Generating stable 3.3V or 5V from variable battery or adapter inputs (e.g., 2S–5S Li-ion, automotive 9–16V). IC Role / Device Role / Timing Role: Wide-input bus regulator maintaining constant output despite VIN sag or surge, using seamless buck-boost transition. Use Value: Delivers >88% efficiency across 2.8–22V input range; COT control limits output droop to <120mV during 3A step load. |
| Industrial IoT Node Power | Medical Portable Equipment |
|
Use Scenario: Powering sensor hubs, wireless transceivers, and microcontrollers in battery-powered edge devices with fluctuating input. IC Role / Device Role / Timing Role: Main system regulator supporting both battery (3.0–4.2V) and USB (4.75–5.25V) inputs without manual switchover. Use Value: Programmable soft-start (900µs) prevents inrush into capacitive loads; EN-controlled discharge avoids residual voltage on shutdown. |
Use Scenario: Supplying isolated subsystems (e.g., display, data acquisition, Bluetooth module) in handheld diagnostic tools. IC Role / Device Role / Timing Role: Certified safety-critical power stage meeting UL2367 and UL60950-1 requirements for medical-grade isolation. Use Value: Hiccup-mode OVP/SCP and thermal warning enable fail-safe operation; 10mV VOUT resolution supports precision analog rail calibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63802DRLR | 2.5–5.5V input, 1.8–5.5V output, 2A max, no I²C, fixed 5V option only | Limited to low-voltage battery-powered apps; lacks USB PD voltage flexibility and CC programming | Select when cost-sensitive, low-power (<2A), and I²C configurability is unnecessary. |
| ISL91302BHRZ-T7A | 2.5–5.5V input, 0.3–5.2V output, 3A, I²C, but no hiccup-mode OVP/SCP | Requires external fault-handling logic for robust short-circuit recovery; no thermal warning output | Choose for ultra-low-noise bias rails where hiccup-mode reliability is secondary to ripple performance. |
Compared with TPS63802DRLR and ISL91302BHRZ-T7A, MP8859GQ-0000-Z uniquely combines 2.8–22V input, 1–20.47V I²C-programmable output, hiccup-mode protections, and thermal warning in a single QFN-16 package-making it the only drop-in solution for USB PD 3.0 sourcing and wide-input industrial bus regulation.
Availability
MP8859GQ-0000-Z is available at Aetrix Electronics and suitable for USB PD sourcing ports, industrial bus supplies, IoT node power systems, and medical portable equipment requiring stable component supply across extended temperature (-40°C to +125°C) and long lifecycle support.
Supply support for MP8859GQ-0000-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 design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP8859 belongs to MPS's USB PD and wide-input buck-boost product line, engineered specifically for compact, software-configurable power delivery in portable and industrial systems where input voltage variability and output programmability are critical.
FAQ
What is the default output voltage and how is it set?
The MP8859GQ-0000-Z ships with OTP-configured default output voltage of 5.0V ±1.5%, set at factory and retained without external programming. This value is stored in non-volatile memory and can be overwritten via I²C commands during system initialization or field updates.
Does the device support automatic mode transition between buck, boost, and buck-boost?
Yes - the MP8859 uses proprietary control logic that automatically transitions between buck, boost, and buck-boost modes based on real-time VIN/VOUT ratio and load conditions, with no external intervention or mode-select pins required.
Can the ALT pin be used for system-level fault reporting?
Yes - ALT is an open-drain output that pulls low during OVP, SCP, or thermal warning events. It can directly drive an MCU GPIO interrupt or LED indicator, and remains asserted until the fault condition clears and the device recovers.
What is the minimum external component count for basic operation?
Only five passive components are required: input capacitor (≥10µF), output capacitor (≥100µF), power inductor (4.7µH), BST1/BST2 bootstrap capacitors (100nF each), and OC-setting resistor (21.5kΩ for 3.5A default). No external feedback resistors or compensation networks are needed.
Is the MP8859GQ-0000-Z UL-certified?
Yes - it is UL certified to UL2367 (E322138) and UL60950-1/UL60950-1-07 (E500002-A1-CB-1), confirming compliance with safety standards for information technology equipment and medical devices.
How does the I²C interface handle multiple devices on the same bus?
The ADD pin supports four unique I²C slave addresses (60H–66H) via resistor divider configuration, enabling up to four MP8859 devices on a single bus without address collision - essential for multi-rail power systems.
What thermal performance can be expected on a standard 4-layer PCB?
On a 64mm×64mm 4-layer evaluation board (EV8859-Q-00B), θJA is 26°C/W. At 3A output and 12V input, junction temperature rise is ~35°C above ambient, staying well below the 150°C shutdown threshold under continuous operation.
MP8859GQ-0000-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.8V
- Voltage - Input (Max):
- 22V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 20.47V
- Current - Output:
- 3A
- Frequency - Switching:
- 500kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-QFN (3x3)
MP8859GQ-0000-Z FAQ
1.How can I place an order for MP8859GQ-0000-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP8859GQ-0000-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 MP8859GQ-0000-Z reliable?
The price and inventory of MP8859GQ-0000-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP8859GQ-0000-Z is usually 5 days.
3.What payment methods are accepted for MP8859GQ-0000-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP8859GQ-0000-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP8859GQ-0000-Z?
MP8859GQ-0000-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP8859GQ-0000-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 MP8859GQ-0000-Z?
For technical support, including MP8859GQ-0000-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP8859GQ-0000-Z requirements.
6.How does Aetrix verify that MP8859GQ-0000-Z is sourced from the original manufacturer or authorized distributors?
All MP8859GQ-0000-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 MP8859GQ-0000-Z meets industry standards.
7.What is the process for return or replacement of MP8859GQ-0000-Z?
All MP8859GQ-0000-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP8859GQ-0000-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 MP8859GQ-0000-Z part is unused and in its original packaging.
Return procedure for MP8859GQ-0000-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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