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Monolithic Power Systems Inc. MPQ8633AGL-Z
- Part No.:
- MPQ8633AGL-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 20-PowerVFQFN
- Datasheet:
-
MPQ8633AGL-Z.pdf
- Description:
- IC REG BUCK ADJ 12A 20QFN
- Quantity:
- Payment:
- Shipping:
Inventory:3,668
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Product details
Overview
MPQ8633AGL-Z from Monolithic Power Systems is a fully integrated synchronous step-down converter delivering up to 12A 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 0.6V to 5.5V, and employs internal constant-on-time (COT) control for ultrafast transient response in telecom power supplies and server point-of-load applications.
For engineers reviewing the MPQ8633AGL-Z datasheet, MPQ8633AGL-Z pinout, MPQ8633AGL-Z application, or MPQ8633AGL-Z equivalent, key selection criteria include its QFN-20 (3mm × 4mm) package, differential remote sensing, non-latch OCP with programmable threshold via RCS resistor, PGOOD open-drain output with clamped low-level behavior during VIN failure, and pre-bias start-up support for reliable system sequencing.
Technical Context
The MPQ8633AGL-Z implements adaptive COT control with internal ramp compensation, enabling stable operation with zero-ESR MLCC output capacitors across full input/output voltage ranges. Its valley-current sensing architecture monitors inductor current cycle-by-cycle through the CS pin, with OCP triggered when VCS exceeds 1.2V (typical), corresponding to 16A max output current limit.
It integrates dual MOSFETs with RDS(ON) of 13.3 mΩ (HS) and 3.8 mΩ (LS) at 25°C, supports forced CCM or pulse-skip light-load modes via MODE pin configuration, and provides precise 0.6V ±0.5% reference over 0°C–70°C junction temperature for tight output regulation in high-density PoL designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 16V - Enables direct use with 12V distribution rails without pre-regulation |
| Max Output Current | 12A - Sustained delivery under thermal limits with QFN-20 package and PGND thermal pad layout |
| Switching Frequency | 600 / 800 / 1000 kHz - Selectable via MODE pin resistor; higher frequencies reduce external inductor size |
| Feedback Reference | 0.6V ±0.5% (0°C–70°C) - Enables accurate 1.0V, 1.2V, or 1.8V rail generation with standard resistor dividers |
| Current Limit Threshold | 1.2V on CS pin - Sets output current limit from 6A to 16A using external RCS resistor (e.g., 100kΩ = 12A) |
| Soft-Start Time | 1ms minimum, programmable up to ~10ms - Controlled by capacitor on TRK/REF pin to prevent inrush into pre-biased loads |
| Thermal Shutdown | 160°C with 30°C hysteresis - Ensures safe recovery after overload without manual reset |
| PGOOD Threshold | 92.5% to 95.5% VREF high, 77% to 83% VREF low - Provides robust power-good signaling with 1ms delay and clamped 0.7V low during VIN loss |
Pinout & Package
MPQ8633AGL-Z is housed in a thermally enhanced QFN-20 package (3mm × 4mm, 0.5mm pitch) with 18 exposed PGND pads for optimal heat dissipation and low-inductance ground return. The package supports JEDEC-standard reflow and features wettable flanks for automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BST | Bootstrap supply node | Connects external bootstrap capacitor between BST and SW to bias high-side gate driver above VIN |
| CS | Current sense input | Sets OCP threshold via resistor to AGND; mirrors inductor valley current with 20 µA/A ratio |
| MODE | Operation mode select | Configures CCM/pulse-skip and switching frequency (600/800/1000 kHz) using resistor to AGND or GND |
| TRK/REF | Tracking/reference input | Accepts 0.3V–1.4V analog signal to track another rail; also sets soft-start time with external capacitor |
| RGND | Remote sense negative | Provides Kelvin connection point for differential feedback; short to GND if remote sense unused |
| FB | Feedback input | Monitors output via resistor divider; error amplifier compares to 0.6V reference for regulation |
| EN | Enable control | Active-high logic input; supports automatic start-up with pull-up to VIN and pre-bias start-up sequence |
| PGOOD | Power-good indicator | Open-drain output; pulls low when VOUT < 92.5% VREF; clamped to ~0.7V during VIN failure |
| VIN | Main power input | Supplies both power stage and internal LDO; requires local ceramic decoupling near pins 10 and 11 |
| VCC | Internal 3V LDO output | Powers control circuitry; requires ≥1µF X7R/X5R ceramic capacitor close to pin 19 |
| SW | Switch node | Drives external inductor; swings from PGND to VIN; requires low-inductance PCB routing |
| PGND | Power ground | 11 dedicated pins (11–18, 10, 21) form low-impedance return path for high-current switching loop |
| AGND | Analog ground | Reference for FB, CS, MODE, TRK/REF; must be star-connected to PGND at single point |
Key Features
| Feature | Design Value |
|---|---|
| Differential remote sensing | Separate RGND and FB pins enable Kelvin connection to load, eliminating IR drop errors in high-current rails |
| Programmable current limit | OCP threshold set precisely from 6A to 16A using single external resistor on CS pin, supporting flexible design margining |
| Output voltage discharge | Integrated discharge FET (RON ≈ 80 Ω) actively pulls SW to PGND when EN is low, ensuring fast, controlled VOUT ramp-down |
| Pre-bias start-up | Monotonic startup into pre-charged outputs by disabling switching until TRK/REF > FB, preventing reverse current flow |
| Stable with zero-ESR capacitors | Internal adaptive ramp compensation eliminates need for ESR-based output capacitor stabilization, enabling compact MLCC-only designs |
| Adaptive COT control | Self-adjusting on-time maintains constant frequency across line/load while delivering <10µs load transient response |
Applications
| Telecom Point-of-Load | Server VR13-Compatible Rail |
|---|---|
Use Scenario: Regulating 1.2V/12A core voltage for ASICs in 5G base station RF modules with strict ripple and transient requirements. IC Role / Device Role / Timing Role: Primary synchronous buck regulator with differential remote sense, programmable OCP, and 800kHz switching for optimized efficiency vs. size trade-off. Use Value: Achieves <15mV output ripple and <5% undershoot during 8A step load due to adaptive COT and low RDS(ON) MOSFETs. | Use Scenario: Generating 1.8V/10A auxiliary rail for memory interfaces in cloud-computing servers requiring strict voltage tracking with main CPU rail. IC Role / Device Role / Timing Role: Tracking buck converter synchronized to master VR controller via TRK/REF pin, with PGOOD coordination for system power sequencing. Use Value: Maintains ±5mV tracking accuracy across temperature and load, enabling simultaneous power-up of interdependent subsystems. |
| High-End TV SoC Power | Game Console GPU Core Supply |
Use Scenario: Delivering 0.9V/12A to advanced video processing SoCs in 4K/8K TVs where thermal density and EMI are critical constraints. IC Role / Device Role / Timing Role: High-efficiency PoL converter operating in forced CCM mode at 1000kHz to minimize inductor footprint and meet CISPR-32 Class B EMI limits. Use Value: Delivers >92% peak efficiency at 6A and maintains <45°C case temperature under full load with 2-layer PCB and 2oz copper. | Use Scenario: Supplying dynamic 0.8V–1.3V core voltage to GPU in next-gen game consoles with aggressive DVFS and rapid load transients. IC Role / Device Role / Timing Role: Adaptive voltage regulator with programmable soft-start and voltage tracking, responding to GPU voltage commands via TRK/REF. Use Value: Supports <200ns voltage step transitions with <8% overshoot using internal COT loop, eliminating need for external compensation. |
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 |
|---|---|---|---|
| MPQ8632GL-Z | 8A rated, same QFN-20 package, identical pinout and feature set except lower current capability and no TRK/REF pin | Lacks voltage tracking and output discharge; suitable only for fixed-output, non-sequenced rails | Select when 8A output suffices and tracking/sequencing is unnecessary - reduces BOM cost by ~12% |
| TPS546B24RVFT | 12A PMBus-enabled buck with digital control, 3.5mm × 3.5mm QFN, higher quiescent current (1.2mA vs. 0.85mA) | Supports real-time telemetry, margining, and fault logging; requires PMBus host interface and additional firmware | Choose for systems needing digital power management and telemetry - adds complexity but enables predictive maintenance |
Compared with MPQ8632GL-Z, the MPQ8633AGL-Z adds voltage tracking, output discharge, and 12A capability at minimal footprint cost; versus TPS546B24RVFT, it offers simpler analog control with faster transient response but lacks digital configurability and telemetry.
Availability
MPQ8633AGL-Z is available at Aetrix Electronics and suitable for telecom infrastructure, server power delivery, and high-performance consumer electronics requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.
Supply support for MPQ8633AGL-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 over two decades of leadership in DC/DC conversion, motor drivers, and LED lighting solutions.
The MPQ8633A belongs to MPS's high-current monolithic buck converter product line, engineered specifically for demanding point-of-load applications in datacenter, networking, and high-end consumer equipment where integration, efficiency, and reliability are critical.
FAQ
What is the minimum recommended input voltage for MPQ8633AGL-Z?
The absolute minimum input voltage is 4V under normal operation with internal VCC bias. With an external 3.3V VCC bias applied, the input range extends down to 2.7V. Operation below 4V without external bias risks VCC undervoltage lockout (2.65V threshold), causing shutdown. Always verify VCC regulation stability using the recommended 1µF ceramic capacitor.
How does the TRK/REF pin function during power-up and tracking?
During startup, TRK/REF must reach ≥600mV before regulation begins; below that, the device remains in soft-start. Once active, TRK/REF accepts 0.3V–1.4V analog signals to directly scale the output voltage (e.g., 1.0V on TRK/REF yields 1.0V on VOUT). The internal soft-start timer is overridden when tracking is active, enabling seamless rail coordination.
Can MPQ8633AGL-Z operate with ceramic output capacitors only?
Yes - its adaptive COT control with internal ramp compensation ensures stability with zero-ESR MLCCs. No series resistor or polymer capacitor is required. Recommended output capacitance is ≥120µF (e.g., three 47µF X7R 0805s) placed close to SW and PGND pins to minimize loop inductance and maintain <10mV ripple.
What happens to PGOOD when input voltage fails?
When VIN drops below UVLO threshold (~2.1V), the internal VCC regulator collapses and PGOOD is actively clamped to ~0.7V regardless of external pull-up voltage. This low-level assertion (not high-impedance) provides unambiguous fault signaling to system controllers, eliminating need for external level-shifting or monitoring circuits.
Is the MPQ8633AGL-Z pin-compatible with MPQ8633AGLE-Z?
No - MPQ8633AGL-Z uses QFN-20 (20-pin) while MPQ8633AGLE-Z uses QFN-21 (21-pin); the latter adds a dedicated BST capacitor pin. Pin functions differ: QFN-20 combines PGND pins 10 and 21 into one VIN pin, reducing ground paths. Layout redesign and schematic updates are required for substitution.
How is over-current protection configured and what is its response behavior?
OCP is set by connecting resistor RCS from CS to AGND, where ILIM = 1.2V / RCS. Protection is non-latching: upon current fault, the HS-FET disables for the remainder of the cycle and resumes normal operation after recovery. Valley-current sensing ensures accurate cycle-by-cycle limiting without external current-sense transformers or resistors.
Does MPQ8633AGL-Z support forced continuous conduction mode at light load?
Yes - MODE pin configuration allows forced CCM operation at all loads by connecting MODE to 30.1kΩ or 60.4kΩ resistor to AGND. This eliminates light-load frequency variation and output voltage dither, essential for noise-sensitive analog circuits and ADC reference supplies where consistent switching spectrum matters.
MPQ8633AGL-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 20-PowerVFQFN
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 2.7V
- Voltage - Input (Max):
- 16V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 5.5V
- Current - Output:
- 12A
- Frequency - Switching:
- 600kHz, 800kHz, 1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-QFN (3x4)
MPQ8633AGL-Z FAQ
1.How can I place an order for MPQ8633AGL-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MPQ8633AGL-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 MPQ8633AGL-Z reliable?
The price and inventory of MPQ8633AGL-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MPQ8633AGL-Z is usually 5 days.
3.What payment methods are accepted for MPQ8633AGL-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MPQ8633AGL-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MPQ8633AGL-Z?
MPQ8633AGL-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MPQ8633AGL-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 MPQ8633AGL-Z?
For technical support, including MPQ8633AGL-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MPQ8633AGL-Z requirements.
6.How does Aetrix verify that MPQ8633AGL-Z is sourced from the original manufacturer or authorized distributors?
All MPQ8633AGL-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 MPQ8633AGL-Z meets industry standards.
7.What is the process for return or replacement of MPQ8633AGL-Z?
All MPQ8633AGL-Z units undergo pre-shipment inspection (PSI). If there is an issue with MPQ8633AGL-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 MPQ8633AGL-Z part is unused and in its original packaging.
Return procedure for MPQ8633AGL-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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