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Monolithic Power Systems Inc. MP9151GD-Z
- Part No.:
- MP9151GD-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 14-PowerVFQFN
- Datasheet:
-
MP9151GD-Z.pdf
- Description:
- IC REG BUCK ADJ 4A 14QFN
- Quantity:
- Payment:
- Shipping:
Inventory:7,426
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Product details
Overview
MP9151GD-Z from Monolithic Power Systems is a synchronous step-down DC/DC converter with integrated 60 mΩ high-side and 30 mΩ low-side MOSFETs, delivering 4A continuous output current across a 4.5V–20V input range. It operates in peak-current-mode control with programmable switching frequency (300 kHz–1.6 MHz), features power-good indication, thermal shutdown, and over-current protection, and is used in DSL/cable modems and set-top boxes requiring compact, efficient 3.3V/5V rails.
For engineers reviewing the MP9151GD-Z datasheet, MP9151GD-Z pinout, MP9151GD-Z application, or MP9151GD-Z equivalent, key selection criteria include its 0.795V feedback reference, 40 ns minimum on-time, internal AAM light-load mode, EN-controlled startup timing, and QFN2x3 package thermal performance under 4A load conditions.
Technical Context
The MP9151GD-Z employs fixed-frequency peak-current-mode control with an internal 0.795V reference and error amplifier driving a COMP node to regulate output voltage. Its oscillator supports external resistor programming (300 kHz–1.6 MHz), and it implements fold-back frequency reduction below 100mV FB voltage during fault conditions.
It integrates a 5V internal VCC regulator powered from VIN, bootstrap circuitry for high-side gate drive (BST pin), and Advanced Asynchronous Modulation (AAM) for PFM operation below ~0.3A load. Thermal shutdown activates at 150°C with 30°C hysteresis, and UVLO triggers at 4.1V rising / 3.25V falling thresholds.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 20V - Supports 5V, 12V, and 19V adapter inputs without external pre-regulation. |
| Output Current | 4A continuous - Sustains full-rated load with proper PCB copper and thermal layout per QFN2x3 package. |
| Feedback Reference | 0.795V ±16mV - Sets output voltage via external resistor divider; enables precise 1.0V–5.0V regulation. |
| Switching Frequency | 300 kHz to 1.6 MHz - Adjustable via FREQ pin resistor; higher frequencies reduce inductor size but increase switching loss. |
| HS/LS RDS(on) | 60 mΩ / 30 mΩ - Low conduction loss enables >90% efficiency at 12VIN/3.3VOUT/4A. |
| Soft-Start Current | 8 μA - Charges external SS capacitor linearly; defines monotonic output ramp time independent of load. |
| Power-Good Thresholds | 90% rise / 80% fall of VFB - Provides clean enable signal for downstream logic after stable regulation is achieved. |
Pinout & Package
MP9151GD-Z is housed in a thermally enhanced 14-pin QFN package (2mm × 3mm, 0.5mm pitch) with exposed thermal pad connected to GND. The package supports ≤1.8W continuous power dissipation at +25°C ambient (θJA = 70°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 12, 13, 14 | GND | Power and signal ground return; must be tied to large copper pour and connected to exposed pad for thermal conduction. |
| 2, 11 | SW | Switch node connecting internal HS/LS MOSFETs; requires wide trace and multiple vias to minimize ringing and EMI. |
| 3, Center Pad | IN | Main input supply (4.5–20V); connects to bulk input capacitor; shared with thermal pad for optimal heat transfer. |
| 4 | EN | Enable control with 2.3μA internal current source; capacitor-to-ground enables programmable startup delay. |
| 5 | PG | Open-drain power-good indicator; requires external pull-up to VCC; asserts high when VFB ≥ 90% of 0.795V. |
| 6 | FB | Feedback input sensing output voltage via resistor divider; internal comparator compares to 0.795V reference. |
| 7 | SS | Soft-start control; 8μA current charges external capacitor to ramp COMP voltage and limit inrush current. |
| 8 | FREQ | Frequency programming input; resistor-to-GND sets oscillator frequency from 300kHz to 1.6MHz. |
| 9 | VCC | Bias supply output (5V regulated); powers internal circuitry; requires 1μF ceramic decoupling close to pin. |
| 10 | BST | Bootstrap supply for high-side gate driver; requires 0.1–1μF capacitor between BST and SW pins. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Power Stage | 60 mΩ HS + 30 mΩ LS MOSFETs eliminate external switch losses and simplify BOM for 4A applications. |
| Programmable Switching Frequency | 300 kHz–1.6 MHz via single resistor - Enables optimization of size (high fSW) vs. efficiency (low fSW). |
| Advanced Asynchronous Modulation (AAM) | PFM light-load mode with ~0.3A exit threshold - Maintains >85% efficiency at 10mA load without audible noise. |
| Internal Compensation | Optimized transconductance error amplifier and compensation network - Reduces external components and stabilizes loop with standard LC filters. |
| Robust Protection Suite | Hiccup-mode OCP, thermal shutdown (150°C), UVLO (4.1V/3.25V), and BST UVLO (2.2V) - Ensures safe operation under fault and brown-out conditions. |
Applications
| DSL/Cable Modem Power Rails | Set-Top Box Core Logic Supply |
|---|---|
|
Use Scenario: Providing stable 3.3V/4A rail to Ethernet PHY, DSP, and memory in broadband access equipment operating from 12V or 19V wall adapters. IC Role / Device Role / Timing Role: Primary synchronous buck regulator managing transient load steps up to 2A/μs while maintaining <±1% output regulation. Use Value: Integrated MOSFETs and 40 ns minimum on-time support tight 3.3V regulation from 12V input with minimal external components and no external driver complexity. |
Use Scenario: Generating 1.2V/4A core voltage for ARM-based SoCs in consumer STBs with strict thermal and ripple requirements. IC Role / Device Role / Timing Role: High-efficiency point-of-load converter with AAM mode enabling <25 mW quiescent power during standby states. Use Value: 0.795V reference and internal compensation allow direct use of standard 1% resistors for accurate 1.2V output without tuning. |
| Industrial Control I/O Modules | Network Edge Router Line Cards |
|
Use Scenario: Delivering 5V/4A to isolated RS-485 transceivers, ADCs, and microcontrollers in DIN-rail mounted PLC modules. IC Role / Device Role / Timing Role: Input-wide buck converter supporting 24V nominal industrial bus with robust UVLO and thermal margin. Use Value: 20V absolute max input rating and 70°C/W θJA ensure reliable operation in 70°C ambient enclosures with minimal heatsinking. |
Use Scenario: Powering FPGA I/O banks and SERDES interfaces on line cards requiring fast transient response and low output ripple. IC Role / Device Role / Timing Role: Peak-current-mode controller with 800kHz default switching frequency balancing EMI filtering and dynamic response. Use Value: PG pin provides system-level power sequencing confirmation, while SS pin enables controlled ramp-up to prevent inrush into large FPGA capacitance. |
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 |
|---|---|---|---|
| MP2384DJ-LF-P | Higher 6A rating, 2.5V–18V input, 500kHz–2.5MHz fSW, smaller 2x2 QFN package, no AAM mode. | Targeted at newer designs needing higher current density and wider fSW range; lacks light-load PFM. | Select MP2384 for new 6A designs where board space is constrained and light-load efficiency is secondary. |
| RT7295BGJ8F | 4A rating, 4.5V–18V input, 600kHz–1.5MHz fSW, 0.8V reference, external compensation required. | Requires additional compensation components; offers adjustable soft-start and more flexible loop tuning. | Choose RT7295B when design demands custom loop response or compatibility with existing Richtek-based platforms. |
Compared with MP9151GD-Z, MP2384 offers higher current and smaller footprint but sacrifices AAM efficiency at light loads, while RT7295B provides greater loop design flexibility at the cost of increased component count and reduced integration.
Availability
MP9151GD-Z is available at Aetrix Electronics and suitable for DSL modems, set-top boxes, and industrial I/O modules requiring stable component supply with long-term lifecycle assurance and RoHS-compliant packaging.
Supply support for MP9151GD-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, headquartered in Kirkland, WA, with global design and support operations.
The MP9151 belongs to MPS's mainstream synchronous buck converter product line, designed for space-constrained, high-efficiency DC/DC conversion in broadband, consumer, and industrial applications where integration and reliability are critical.
FAQ
What is the recommended input capacitor for MP9151GD-Z in a 12V-to-3.3V/4A application?
A 22µF X5R/X7R ceramic capacitor placed directly at the IN and GND pins is recommended. It must handle ≥2A RMS ripple current; adding a 0.1µF ceramic in parallel improves high-frequency decoupling. Electrolytic or tantalum types require a local 0.1µF ceramic to suppress switching noise.
Can MP9151GD-Z operate with a 24V input?
No - the absolute maximum input voltage is 22V. Applying 24V exceeds the VIN rating and risks permanent damage. For 24V systems, use MP2384 (18V max) with pre-regulation or select a 36V-input buck like MPQ4571.
How does the power-good (PG) pin behave during startup and fault conditions?
PG remains low until FB reaches ≥90% of 0.795V (≈0.715V), then pulls high via external pull-up. If FB drops to ≤80% (≈0.636V) due to overload or short, PG is actively pulled low. PG does not assert during soft-start or thermal shutdown.
What is the purpose of the BST pin and what capacitor value is required?
BST supplies floating gate drive voltage for the high-side MOSFET. A 0.1µF to 1µF ceramic capacitor must connect between BST and SW pins. Insufficient BST capacitance causes high-side turn-off failure and thermal stress under heavy load.
Does MP9151GD-Z support pre-biased output startup?
Yes - if the output is pre-biased at startup, the IC disables both HS and LS switches until the SS capacitor voltage exceeds the sensed FB voltage, preventing reverse current and ensuring monotonic ramp-up without output collapse.
What is the minimum output voltage achievable with MP9151GD-Z?
The minimum regulated output is 0.8V (95% of 0.795V reference), but practical minimum is 1.0V due to resistor tolerance and FB pin current error. For sub-1V outputs, use T-network feedback or a dedicated low-VREF converter like MPQ2451.
Is MP9151GD-Z pin-compatible with other MPS buck converters?
No - MP9151GD-Z uses a unique 14-pin QFN2x3 layout optimized for thermal performance and SW/GND routing. Pin mapping differs from MP2384 (10-pin QFN2x2) and MPQ4571 (16-pin QFN3x3); PCB redesign is required for substitution.
MP9151GD-Z 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-Z FAQ
1.How can I place an order for MP9151GD-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP9151GD-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 MP9151GD-Z reliable?
The price and inventory of MP9151GD-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP9151GD-Z is usually 5 days.
3.What payment methods are accepted for MP9151GD-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP9151GD-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP9151GD-Z?
MP9151GD-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP9151GD-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 MP9151GD-Z?
For technical support, including MP9151GD-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP9151GD-Z requirements.
6.How does Aetrix verify that MP9151GD-Z is sourced from the original manufacturer or authorized distributors?
All MP9151GD-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 MP9151GD-Z meets industry standards.
7.What is the process for return or replacement of MP9151GD-Z?
All MP9151GD-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP9151GD-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 MP9151GD-Z part is unused and in its original packaging.
Return procedure for MP9151GD-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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