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Monolithic Power Systems Inc. MPQ8634BGLE-Z
- Part No.:
- MPQ8634BGLE-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 21-PowerVFQFN
- Datasheet:
-
MPQ8634BGLE-Z.pdf
- Description:
- IC REG BUCK ADJ 20A 21QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,930
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Product details
Overview
MPQ8634BGLE-Z from Monolithic Power Systems is a fully integrated, high-frequency synchronous buck converter delivering up to 20A output current with adjustable current limit, programmable switching frequency (600/800/1000 kHz), and voltage tracking capability. It operates from 4V–16V input, regulates output from 0.9V to 6V, and features internal COT control for ultrafast transient response in telecom power supplies, server PoL rails, and GPU core voltage regulation.
For engineers reviewing the MPQ8634BGLE-Z datasheet, MPQ8634BGLE-Z pinout, MPQ8634BGLE-Z application, or MPQ8634BGLE-Z equivalent, key selection criteria include its QFN-21 (3mm×4mm) package thermal performance (θJB = 8°C/W), differential remote sense accuracy, non-latching OCP with programmable threshold via CS pin, and PGOOD active-clamp behavior during VIN failure.
Technical Context
The MPQ8634BGLE-Z implements adaptive constant-on-time (COT) control with internal ramp compensation, enabling stable operation with zero-ESR MLCC output capacitors across full input/output voltage ranges. Its error amplifier supports differential remote sensing via dedicated VSNS− and FB pins, achieving <±1% reference voltage accuracy over −40°C to +125°C junction temperature.
Switching behavior is configurable via MODE pin: selectable pulse-skip mode for light-load efficiency or forced CCM for ripple consistency, with three fixed frequencies set by external resistor values. Protection architecture includes latch-off OVP (116% VREF), non-latch UVP (80% VREF), OTP shutdown at 160°C, and negative inductor current limiting at −10A with 200ns timeout.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V–16V (internal VCC bias) or 2.85V–16V (external 3.3V bias); enables direct 12V rail conversion without pre-regulation. |
| Output Current | 20A continuous; supported by low RDS(ON) HS-FET (8.6 mΩ) and LS-FET (2.5 mΩ) for <1.5W conduction loss at full load. |
| Switching Frequency | 600/800/1000 kHz (resistor-programmable); fixed frequency simplifies EMI filter design and avoids subharmonic oscillation. |
| Reference Voltage | 0.9V ±0.5% (0°C–70°C), ±1% (−40°C–125°C); ensures tight output regulation under thermal stress in server and networking environments. |
| Current Limit Accuracy | 1.2V ±4.2% threshold at CS pin; allows precise 16–24A programmable OCP using standard 1% resistors. |
| Thermal Resistance | θJB = 8°C/W; enables 20A operation with ≤25°C rise above PCB under typical 2-layer board layout with thermal vias. |
| PGOOD Thresholds | Rising: 92.5% VREF; falling: 80% VREF; provides clean power sequencing margin for FPGA and ASIC core rails. |
Pinout & Package
MPQ8634BGLE-Z is housed in a thermally enhanced QFN-21 (3mm × 4mm, 0.5mm pitch) package with exposed thermal pad (EP) connected to PGND. The package supports >20A current handling and achieves θJC_TOP = 18°C/W for top-side cooling integration.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 BST | Bootstrap supply | Drives high-side MOSFET gate; requires ceramic capacitor between BST and SW to sustain gate drive above VIN during HS conduction. |
| 3 CS | Current sense input | Sets OCP threshold via external resistor; mirrors inductor current with 10 µA/A ratio for accurate cycle-by-cycle limiting. |
| 4 MODE | Operation mode select | Configures CCM/pulse-skip and selects 600/800/1000 kHz via resistor to AGND; no pull-up required. |
| 5 TRK/REF | Tracking reference input | Accepts 0.3–1.4V analog signal to force output voltage tracking; also sets soft-start time when capacitor added to VSNS−. |
| 6 VSNS− | Remote sense return | Differential negative sense input; short to AGND if remote sensing unused; minimizes IR drop errors in high-current rails. |
| 7 FB | Feedback input | Monitors output via resistor divider; high-impedance (50–100 nA) input enables precision regulation with minimal divider loading. |
| 8 EN | Enable control | Active-high logic input; 1.22V threshold with 200mV hysteresis enables robust power sequencing with RC delay networks. |
| 9 PGOOD | Power good indicator | Open-drain output clamped to ~0.7V during VIN failure; requires external pull-up for system reset or enable coordination. |
| 10,21 VIN | Main power input | Supplies both power stage and internal LDO; requires low-ESR bulk and high-frequency ceramic input capacitors near pins. |
| 11–18 PGND | Power ground | High-current return path for inductor and MOSFETs; must be connected via wide copper pours and multiple thermal vias to inner layers. |
| 19 VCC | Internal LDO output | 3.0V ±4% regulated supply for control circuitry; decoupled with ≥1µF X7R ceramic capacitor for noise immunity. |
| 20 SW | Switch node | Connects to inductor and bootstrap capacitor; high dV/dt node requiring minimized loop area and guard ring isolation. |
Key Features
| Feature | Design Value |
|---|---|
| Differential remote sense | VSNS− and FB pins enable <±5mV output voltage error over 20A load step, critical for CPU/GPU core rail stability. |
| Programmable current limit | CS pin accepts 1.15–1.25V threshold with 10 µA/A mirroring ratio, allowing ±3% OCP setting accuracy using 1% resistors. |
| Voltage tracking & soft-start | TRK/REF pin supports synchronized multi-rail startup and adjustable soft-start (1.5ms base, scalable with capacitor). |
| Adaptive COT control | Internal ramp compensation eliminates need for external compensation network while maintaining stability with MLCC-only output filters. |
| Pre-bias start-up | Enables monotonic ramp into pre-charged loads (e.g., hot-swap systems) without output voltage overshoot or reverse current. |
| Output discharge | Integrated 80Ω discharge FET activates on EN deassertion, reducing VOUT to <10% of target within 10ms for safe power-down sequencing. |
Applications
| Telecom Point-of-Load | Server Core Voltage Rail |
|---|---|
|
Use Scenario: Regulating 0.85V/15A core voltage for 5G baseband processors in compact RRUs. IC Role / Device Role / Timing Role: Primary synchronous buck controller with differential remote sense and programmable OCP for dynamic load management. Use Value: 20A capability and 8.6 mΩ HS-FET minimize conduction loss, enabling >92% efficiency at 12V input while meeting strict thermal envelope limits. |
Use Scenario: Delivering 1.2V/18A to dual-core Xeon D processors in edge server mezzanine cards. IC Role / Device Role / Timing Role: High-current PoL regulator with voltage tracking to coordinate with memory I/O rail sequencing. Use Value: TRK/REF pin enables synchronized ramp with DDR4 VDDQ, eliminating timing skew and preventing data corruption during cold boot. |
| GPU Power Delivery | Industrial FPGA Power |
|
Use Scenario: Supplying 0.95V/20A to mid-tier graphics processing units in gaming consoles. IC Role / Device Role / Timing Role: Main GPU core rail controller with pulse-skip mode for standby efficiency and forced CCM for gaming load transients. Use Value: Adaptive COT delivers <5µs load-step response (0–12A), suppressing voltage droop below ±25mV and ensuring GPU clock stability. |
Use Scenario: Powering 1.0V/16A Artix-7 FPGA fabric in industrial PLC backplanes with extended temperature range. IC Role / Device Role / Timing Role: Robust PoL converter with latch-off OVP and −40°C to +125°C operation for factory-floor reliability. Use Value: 160°C OTP shutdown and 116% VREF OVP prevent catastrophic failure during overvoltage events caused by upstream DC-DC faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MPQ8633BGLE-Z | 16V/12A rating, same QFN-21 package and pinout; lacks TRK/REF and voltage tracking functionality. | Suitable for fixed-output PoL where rail coordination is unnecessary; lower cost but no multi-rail sequencing support. | Select when output current demand is ≤12A and tracking/soft-start flexibility is not required. |
| RTQ2132BGQW-Z | Richtek part with 16V/20A rating, 600–2.2MHz programmable frequency, but uses QFN-20 (4mm×4mm) and lacks differential remote sense. | Higher max frequency enables smaller magnetics but sacrifices remote sensing accuracy for high-current FPGA rails. | Choose for space-constrained designs needing >1MHz switching, accepting ±15mV regulation error without VSNS−. |
Compared with MPQ8634BGLE-Z, MPQ8633BGLE-Z reduces current capacity and removes tracking capability, while RTQ2132BGQW-Z trades remote sense precision for wider frequency range and larger footprint-making MPQ8634BGLE-Z optimal for thermally dense, multi-rail telecom/server systems requiring tight regulation and coordinated startup.
Availability
MPQ8634BGLE-Z is available at Aetrix Electronics and suitable for telecom infrastructure, cloud-computing power supplies, and high-end GPU power delivery requiring stable component supply and long-term production continuity.
Supply support for MPQ8634BGLE-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 mixed-signal ICs for power management, motion control, and automotive applications.
The MPQ8634B belongs to MPS's high-current synchronous buck converter product line, designed specifically for demanding point-of-load applications in data centers, networking equipment, and consumer electronics requiring compact size, high efficiency, and robust protection.
FAQ
What is the minimum recommended output capacitance for stable operation?
The MPQ8634BGLE-Z is stable with zero-ESR MLCC output capacitors; a minimum of 220µF total capacitance (e.g., four 47µF/6.3V X7R in parallel) is recommended for 20A loads to maintain <20mV peak-to-peak ripple and ensure COT loop stability across temperature.
How does the TRK/REF pin affect soft-start timing?
Soft-start time starts at 1.5ms (internal timer) and scales linearly with capacitance on TRK/REF: tSS (ms) ≈ 36 × CSS (nF) / 0.9V. A 1nF capacitor yields ~1.5ms, while 10nF extends it to ~15ms-enabling controlled ramp for sensitive SoCs without external circuitry.
Can the MPQ8634BGLE-Z operate with only ceramic input capacitors?
Yes-its high-frequency operation (up to 1MHz) and internal compensation allow full functionality with ≥47µF ceramic input capacitance placed close to VIN and PGND pins; bulk electrolytic caps are optional but improve hold-up time during line dips.
What is the purpose of the negative current limit feature?
The −10A negative inductor current limit prevents reverse conduction during light-load pulse-skip mode, avoiding energy loss and potential instability. It triggers a 200ns LS-FET blanking period, ensuring clean zero-crossing detection and minimizing shoot-through risk.
How is over-voltage protection cleared after a fault event?
OVP is latch-off: once FB exceeds 116% VREF, the HS-FET shuts down permanently until VIN or EN is power-cycled. Recycling EN alone is insufficient if VCC remains powered; full reset requires removal and reapplication of input voltage or VCC bias.
Does the device support pre-bias start-up with an externally applied output voltage?
Yes-the MPQ8634BGLE-Z enters pre-bias mode when FB voltage is >0V at EN assertion. It disables switching until TRK/REF voltage exceeds FB, then gradually ramps output without reverse current or overshoot, supporting hot-swap and redundant power architectures.
What thermal derating applies above 70°C ambient?
No explicit derating curve is provided, but θJB = 8°C/W implies ~12.5°C rise per 10A at 20A. For continuous 20A operation above 70°C ambient, PCB thermal design must maintain junction temperature ≤125°C-requiring ≥4 thermal vias under EP and 2oz copper on inner layers.
MPQ8634BGLE-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 21-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):
- 4V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.9V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 20A
- Frequency - Switching:
- 480kHz ~ 1.15MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 21-QFN (3x4)
MPQ8634BGLE-Z FAQ
1.How can I place an order for MPQ8634BGLE-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ8634BGLE-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 MPQ8634BGLE-Z reliable?
The price and inventory of MPQ8634BGLE-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ8634BGLE-Z is usually 5 days.
3.What payment methods are accepted for MPQ8634BGLE-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ8634BGLE-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ8634BGLE-Z?
MPQ8634BGLE-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ8634BGLE-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 MPQ8634BGLE-Z?
For technical support, including MPQ8634BGLE-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ8634BGLE-Z requirements.
6.How does Aetrix verify that MPQ8634BGLE-Z is sourced from the original manufacturer or authorized distributors?
All MPQ8634BGLE-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 MPQ8634BGLE-Z meets industry standards.
7.What is the process for return or replacement of MPQ8634BGLE-Z?
All MPQ8634BGLE-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ8634BGLE-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 MPQ8634BGLE-Z part is unused and in its original packaging.
Return procedure for MPQ8634BGLE-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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