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Monolithic Power Systems Inc. MP9151GD-P
- Part No.:
- MP9151GD-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-PowerVFQFN
- Datasheet:
-
MP9151GD-P.pdf
- Description:
- IC REG BUCK ADJ 4A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,005
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Product details
Overview
MP9151GD-P from Monolithic Power Systems is a synchronous step-down DC/DC converter IC with integrated 60 mΩ high-side and 30 mΩ low-side MOSFETs, delivering up to 4A continuous output current across a 4.5V–20V input range, supporting adjustable 300kHz–1.6MHz switching frequency, and featuring power-good indication, thermal shutdown, and over-current protection - deployed in DSL/cable modems and set-top boxes for compact, high-efficiency local regulation.
For engineers reviewing the MP9151GD-P datasheet, MP9151GD-P pinout, MP9151GD-P application, or MP9151GD-P equivalent, key selection criteria include its 2×3mm QFN-14 package, internal AAM light-load mode, programmable soft-start via external capacitor, and compatibility with ceramic input/output capacitors in space-constrained consumer electronics power rails.
Technical Context
The MP9151GD-P operates in fixed-frequency peak-current-mode control with internal compensation, enabling fast transient response and simplified loop stability. Its error amplifier compares FB voltage against a 0.795V reference and drives COMP voltage to regulate switch conduction time.
It integrates a 5V internal VCC regulator powered from VIN, bootstrap circuitry for high-side gate drive (requiring external BST capacitor between SW and BST), and an Advanced Asynchronous Modulation (AAM) mode that enables pulse-skipping below ~0.3A load at 12VIN/3.3VOUT, reducing light-load quiescent current to 0.7mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 20V - supports wide-range industrial and broadband power inputs without pre-regulation. |
| Output Current | 4A continuous - sufficient for powering SoCs, FPGAs, or multi-rail subsystems in modems and STBs. |
| Switching Frequency | 300kHz to 1.6MHz - programmable via resistor on FREQ pin; enables EMI optimization and inductor size reduction. |
| Feedback Reference | 0.795V ±16mV - precise internal reference enabling accurate output voltage setting with standard resistor dividers. |
| Thermal Shutdown | 150°C with 30°C hysteresis - protects die during sustained overload or poor PCB thermal design. |
| Power Good Threshold | Rising: 90% of regulation voltage; falling: 80% - provides reliable system sequencing and fault detection. |
| Quiescent Current | 0.7mA at 12VIN - enables low standby power in always-on consumer devices. |
Pinout & Package
MP9151GD-P is housed in a thermally enhanced 2mm × 3mm, 14-pin QFN package with exposed thermal pad (connected to GND). The package supports high-density layout and efficient heat dissipation via PCB copper planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12, 13, 14 | GND | Ground return for power and signal paths; must connect to large copper area and exposed pad for thermal performance. |
| 2, 11 | SW | Switch node - high di/dt path requiring wide traces and multiple vias to minimize EMI and voltage spikes. |
| 3, Center Pad | IN | Main input supply (4.5–20V); requires local 22µF ceramic decoupling capacitor placed adjacent to pins. |
| 4 | EN | Enable control with 2.3µA internal pull-up; logic-high >1.3V enables operation; capacitor to GND enables delayed startup. |
| 5 | PG | Open-drain power-good indicator - requires external pull-up to VCC; signals valid regulation when FB ≥90% of 0.795V. |
| 6 | FB | Feedback input - connects to resistor divider; regulates output by comparing against 0.795V reference. |
| 7 | SS | Soft-start timing control - 8µA internal current charges external capacitor; start time = 0.795V × CSS / 8µA. |
| 8 | FREQ | Frequency programming - resistor to GND sets fSW from 300kHz to 1.6MHz per R = 28000 / fSW(kHz). |
| 9 | VCC | Bias supply output - regulated 5V rail; requires 1µF ceramic decoupling close to pin. |
| 10 | BST | Bootstrap supply - connects via 0.1–1µF capacitor to SW to generate floating gate drive for high-side MOSFET. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power MOSFETs | 60 mΩ HS + 30 mΩ LS - eliminates external switches, reduces BOM count, and improves efficiency at 4A load. |
| Programmable Switching Frequency | 300kHz–1.6MHz - allows trade-off between inductor size, efficiency, and EMI compliance in final layout. |
| Advanced Asynchronous Modulation (AAM) | Enables PFM operation below ~0.3A - cuts light-load quiescent current to 0.7mA while maintaining regulation. |
| Internal Compensation Network | Optimized for minimal external components - eliminates need for external compensation network in most designs. |
| Robust Protection Suite | OCP (hiccup mode), thermal shutdown (150°C), UVLO (4.1V rising), and PG monitoring - ensures safe operation under fault conditions. |
Applications
| Cable Modem Power Rail | DSL Modem Core Supply |
|---|---|
|
Use Scenario: Regulating 12V input to stable 3.3V/4A for DOCSIS-compliant cable modem PHY and MAC subsystems. IC Role / Device Role / Timing Role: Primary synchronous buck controller managing high-current, low-noise local power delivery with fast load-step response. Use Value: Delivers 4A at >92% efficiency with <15mV output ripple using 2.2µH inductor and ceramic caps - meets DOCSIS thermal and EMI requirements. |
Use Scenario: Generating 2.5V/4A from 12V input for ADSL2+ line card DSP and analog front-end. IC Role / Device Role / Timing Role: High-efficiency point-of-load regulator with programmable soft-start to prevent inrush into downstream LDOs. Use Value: Internal AAM mode reduces no-load power to <15µA, extending standby battery life in always-on DSL gateways. |
| Set-Top Box SoC Core Supply | Home Gateway CPU Subsystem |
|
Use Scenario: Providing 1.2V/4A to ARM-based application processor in IPTV set-top boxes with dynamic DVFS scaling. IC Role / Device Role / Timing Role: Fast-transient buck converter synchronized to system clock domain via programmable fSW. Use Value: Peak-current-mode control delivers <50µs recovery from 80% load step - maintains SoC voltage within ±2% spec during video decode bursts. |
Use Scenario: Delivering 5V/4A to Wi-Fi/BT combo module and Ethernet PHY in multi-service home gateways. IC Role / Device Role / Timing Role: Compact, integrated buck regulator replacing discrete controllers + MOSFETs in constrained 2-layer PCB layouts. Use Value: 2×3mm QFN-14 footprint saves >40% board area vs. comparable 16-pin solutions - critical for mini-PCB gateway modules. |
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 |
|---|---|---|---|
| MP2384GQ-Z | Successor device: 4.5–36V input, 4A, 500kHz–2.5MHz fSW, lower 0.765V reference, improved light-load efficiency. | Supports higher input voltages (up to 36V) and wider output adjustment range - suitable for next-gen gateways with 24V PoE inputs. | Select MP2384GQ-Z for new designs requiring extended VIN range, tighter VREF tolerance, or higher fSW headroom. |
| RT7297BGJ8F | Richtek part: 4.5–32V input, 4A, 600kHz fixed fSW, 0.6V reference, no AAM mode, external compensation required. | Lacks programmable frequency and internal compensation - increases design complexity but offers lower BOM cost in fixed-freq applications. | Choose RT7297BGJ8F only if fixed 600kHz operation suffices and external compensation is acceptable for cost-sensitive production. |
Compared with MP9151GD-P, MP2384GQ-Z extends input range and improves light-load behavior, while RT7297BGJ8F trades flexibility for lower unit cost and fixed-frequency simplicity - both require layout and loop compensation revalidation.
Availability
MP9151GD-P is available at Aetrix Electronics and suitable for DSL modems, cable modems, and set-top boxes requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP9151GD-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 power ICs, headquartered in Kirkland, WA, with global design and support centers.
The MP9151 belongs to MPS's high-density synchronous buck converter product line, designed specifically for space-constrained broadband and consumer electronics requiring integrated power stages and robust protection.
FAQ
What is the minimum recommended input capacitance for MP9151GD-P?
A 22µF X5R/X7R ceramic capacitor is recommended for most applications, placed directly between IN and GND pins with short, wide traces. For high-RMS current scenarios (e.g., VIN ≈ 2×VOUT), select a capacitor rated for ≥2A RMS ripple current - typically achieved with parallel 10µF + 10µF or 22µF with low-ESR construction.
Can MP9151GD-P operate with a pre-biased output?
Yes - the IC disables switching until the soft-start capacitor voltage exceeds the sensed FB voltage. This prevents reverse current flow into a pre-charged output, protecting downstream circuits. No external diode is needed, and the feature activates automatically during startup.
How is the switching frequency set, and what resistor value yields 800kHz?
Connect a resistor from FREQ pin to GND. Use RFREQ = 28000 / fSW(kHz) kΩ. For 800kHz: R = 28000 / 800 = 35kΩ (standard 34.8kΩ 1% resistor). Tolerance affects fSW by ±10%; verify with oscilloscope on SW node.
Does MP9151GD-P support forced PWM mode, or is it strictly AAM/PFM?
MP9151GD-P operates exclusively in AAM (adaptive PFM) mode at light loads and fixed-frequency peak-current mode at heavier loads - there is no user-controllable forced PWM option. The transition occurs automatically around 0.3A at 12VIN/3.3VOUT.
What is the purpose of the BST capacitor, and what value is recommended?
The BST capacitor (0.1–1µF ceramic) forms a floating supply for the high-side gate driver. It charges through the internal bootstrap diode when SW is low and powers the HS driver when SW is high. Use 0.22µF X7R for general use; place as close as possible between BST and SW pins.
Is MP9151GD-P pin-compatible with MP2384GQ-Z?
No - MP2384GQ-Z uses an 8-pin QFN package with different pinout (no dedicated SS, FREQ, or PG pins), different internal reference (0.765V), and revised protection thresholds. Board redesign and firmware updates are required for migration.
What thermal derating applies above 25°C ambient?
With θJA = 70°C/W on a 4-layer PCB, maximum continuous power dissipation drops linearly: PDMAX = (150°C − TA) / 70. At 70°C ambient, PDMAX = 1.14W - corresponding to ~2.8A at 12VIN/3.3VOUT. Use thermal vias under exposed pad to improve θJA.
MP9151GD-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 14-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):
- 4.5V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 19V
- Current - Output:
- 4A
- Frequency - Switching:
- 300kHz ~ 1.6MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 14-QFN (2x3)
MP9151GD-P FAQ
1.How can I place an order for MP9151GD-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP9151GD-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 MP9151GD-P reliable?
The price and inventory of MP9151GD-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP9151GD-P is usually 5 days.
3.What payment methods are accepted for MP9151GD-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP9151GD-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP9151GD-P?
MP9151GD-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP9151GD-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 MP9151GD-P?
For technical support, including MP9151GD-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP9151GD-P requirements.
6.How does Aetrix verify that MP9151GD-P is sourced from the original manufacturer or authorized distributors?
All MP9151GD-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 MP9151GD-P meets industry standards.
7.What is the process for return or replacement of MP9151GD-P?
All MP9151GD-P units undergo pre-shipment inspection (PSI). If there is an issue with MP9151GD-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 MP9151GD-P part is unused and in its original packaging.
Return procedure for MP9151GD-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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