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Monolithic Power Systems Inc. MP2491NGQB-Z
- Part No.:
- MP2491NGQB-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 13-PowerVFQFN
- Datasheet:
-
MP2491NGQB-Z.pdf
- Description:
- IC REG BUCK ADJ 6A 13QFN
- Quantity:
- Payment:
- Shipping:
Inventory:4,598
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Product details
Overview
MP2491NGQB-Z from Monolithic Power Systems is a 32V, 6A synchronous step-down converter with constant-on-time (COT) control, integrated 30mΩ/20mΩ MOSFETs, and QFN-13 (2.5mm×3mm) packaging. It delivers tight output regulation across 4V–32V input and 0.5V–30V output ranges, supports adjustable soft start and power-good indication, and targets high-efficiency DC/DC conversion in space-constrained industrial and display power rails.
For engineers reviewing the MP2491NGQB-Z datasheet, MP2491NGQB-Z pinout, MP2491NGQB-Z application, or MP2491NGQB-Z equivalent, key selection criteria include its COT architecture for fast transient response, hiccup-mode over-current protection, configurable PFM/PWM operation, and thermal shutdown at 165°C - all validated for continuous 6A output under 32V input stress.
Technical Context
The MP2491NGQB-Z employs a constant-on-time (COT) control architecture with internal ramp compensation to maintain stable switching frequency (~540kHz) across wide input voltage (4V–32V) and load (0–6A) ranges. Its integrated high-side and low-side MOSFETs (30mΩ/20mΩ) enable synchronous rectification without external drivers.
It features dual-mode operation: forced PWM for noise-sensitive applications and auto PFM/PWM for light-load efficiency optimization. The 4.44V internal VCC LDO powers internal logic independently of EN state, and the bootstrap circuit autonomously charges the BST capacitor using VIN and SW node coupling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 32V - supports wide industrial and automotive supply rails without pre-regulation. |
| Output Current | 6A continuous - sustains full rated load with thermal shutdown at 165°C and 25°C hysteresis. |
| Switching Frequency | Fixed 540kHz (±21%) - enables compact magnetics and predictable EMI filtering design. |
| Internal MOSFET RDS(on) | 30mΩ (HS), 20mΩ (LS) - minimizes conduction loss and eliminates need for external power switches. |
| Feedback Reference | 0.5V ±0.5% - enables precise output setting from 0.5V to 30V via resistor divider. |
| Soft Start Current | 9μA - allows accurate CSS timing (e.g., 100nF → ~5.6ms soft-start ramp). |
| Power Good Threshold | UV: 89% of VREF, OV: 115% of VREF - provides robust output monitoring with 350μs rising delay. |
Pinout & Package
MP2491NGQB-Z is housed in a thermally enhanced QFN-13 package (2.5mm × 3mm, 0.5mm pitch) with exposed thermal pad. Pin 1 is marked by a dot; top marking includes product code "BUP", year/week code, and lot number.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Input power supply | Main HV rail connection; drains internal HS-FET and powers chip - requires local 10µF×3 ceramic decoupling. |
| 2 PGND | Power ground return | High-current return path for switch node; must be isolated from AGND trace to prevent noise injection. |
| 3 VCC | Internal LDO output | 4.44V regulated supply for internal logic; requires 2.2µF ceramic decoupling - active even when EN = low. |
| 4 SS | Soft-start control | Internal 9μA current source charges external capacitor to linearly ramp reference voltage during startup. |
| 5,12 NC | No connection | Unbonded die pads - must float or connect to AGND per layout guidelines. |
| 6 FB | Output voltage feedback | Connects to resistor divider tap; senses VOUT relative to 0.5V reference to regulate output. |
| 7 AGND | Analog ground reference | Low-noise reference for error amplifier and comparators; tie directly to PGND at single point. |
| 8 SW | Switch node output | Drain of LS-FET and source of HS-FET - connects to inductor; critical for EMI and thermal layout. |
| 9 BST | Bootstrap supply | Forms floating gate drive for HS-FET via external capacitor between BST and SW pins. |
| 10 MODE | Operation mode select | Logic-level input: tie to AGND for forced PWM, to VCC for auto PFM/PWM - no floating allowed. |
| 11 EN | Enable control | Active-high digital input (1.2V threshold); includes 2MΩ internal pull-down and 6V Zener clamp. |
| 13 PG | Power-good indicator | Open-drain output signaling valid VOUT (89–115% of VREF); requires external pull-up to VCC or system rail. |
Key Features
| Feature | Design Value |
|---|---|
| Constant-On-Time (COT) Control | Enables <10µs load transient response without external compensation components - ideal for dynamic CPU/GPU rails. |
| Integrated Dual MOSFETs | 30mΩ HS + 20mΩ LS switches eliminate external FETs and gate drivers, reducing BOM count and PCB area by >30%. |
| Configurable Soft Start | External capacitor sets precise startup ramp time (e.g., 100nF → 5.6ms), preventing inrush current and output overshoot. |
| Hiccup-Mode Over-Current Protection | Enters periodic restart on sustained overload or short-circuit - limits average power dissipation and prevents thermal runaway. |
| Power-Good (PG) with UV/OV Detection | Monitors VOUT against 89% (UV) and 115% (OV) of 0.5V reference with 350µs delay - enables safe sequencing in multi-rail systems. |
Applications
| TV Power Rails | Industrial HMI Displays |
|---|---|
|
Use Scenario: Powering 5V/3.3V logic and backlight drivers in 4K UHD TV mainboards with 12–24V input bus. IC Role / Device Role / Timing Role: Primary synchronous buck regulator delivering stable 5V @ 6A to SoC and interface ICs; COT control maintains regulation during burst-mode video processing loads. Use Value: Achieves >92% efficiency at 6A/24V→5V, reducing heatsink requirements and enabling fanless TV designs. |
Use Scenario: Generating 3.3V/1.8V rails for ARM-based HMIs in factory automation panels with 24V DC field supply. IC Role / Device Role / Timing Role: High-reliability DC/DC converter operating continuously at -40°C to +85°C ambient; thermal shutdown and hiccup OCP ensure fault resilience in unattended operation. Use Value: Eliminates need for external current-sense resistors and loop compensation, cutting bill-of-materials cost by $0.32 per unit. |
| MFP Mainboard Supplies | Smart POS Terminal Power |
|
Use Scenario: Supplying 5V/12V outputs for scanner engines, print heads, and network controllers in multifunction printers. IC Role / Device Role / Timing Role: Dual-rail capable buck converter (via resistor-divider reconfiguration) supporting variable VOUT from 0.5V to 30V; MODE pin selects forced PWM to suppress audible noise during scanning. Use Value: Reduces standby quiescent current to 220μA in PFM mode, extending battery backup runtime during power outages. |
Use Scenario: Providing clean 5V rail to payment processing modules and touch controllers in retail POS terminals powered from 12V vehicle or wall adapters. IC Role / Device Role / Timing Role: Input-robust buck regulator tolerating 32V transients from automotive 12V systems; PG signal synchronizes secure element boot sequence. Use Value: Maintains regulation down to 4V input, enabling uninterrupted operation during cold-crank battery dips in mobile POS deployments. |
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 |
|---|---|---|---|
| MP2492NGQB-Z | Same QFN-13 package but adds programmable frequency (300–2.2MHz) and external synchronization; higher IQ (250μA vs. 220μA). | Required where EMI compliance mandates spread-spectrum or synchronized switching across multiple rails. | Select MP2492NGQB-Z only if frequency agility or sync capability is mandatory; otherwise MP2491NGQB-Z offers lower cost and identical thermal performance. |
| RT7295BGJ8F | 6A rating, 4–36V input, but uses current-mode control (not COT); larger 4mm×4mm QFN-16 package; no integrated BST diode. | Suitable for legacy designs requiring current-mode loop stability analysis or compatibility with existing RT7295B layout footprints. | Choose RT7295BGJ8F only if existing board has RT7295B footprint or if current-mode control is required for specific loop compensation needs. |
Compared with MP2492NGQB-Z and RT7295BGJ8F, MP2491NGQB-Z delivers superior light-load efficiency via auto PFM/PWM, smaller footprint (2.5mm×3mm), and simpler layout due to integrated bootstrap charging - making it optimal for new space-constrained, cost-sensitive industrial and display power designs.
Availability
MP2491NGQB-Z is available at Aetrix Electronics and suitable for TV power supplies, industrial HMI displays, MFP mainboards, and smart POS terminals requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2491NGQB-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 power management ICs, with over two decades of expertise in DC/DC converters, LED drivers, and motor drivers.
The MP2491N product line targets high-efficiency, high-voltage synchronous buck conversion for consumer, industrial, and computing applications - emphasizing integration, thermal robustness, and ease of use in compact layouts.
FAQ
What is the minimum recommended input voltage for reliable startup?
The MP2491NGQB-Z requires ≥3.7V on the IN pin to exit under-voltage lockout (UVLO) and initiate switching. Startup is guaranteed at 3.9V (rising threshold), and the device remains operational down to 3.5V before UVLO triggers again. Below 3.5V, the IC disables and draws only 50μA quiescent current.
Can the MP2491NGQB-Z operate with ceramic output capacitors only?
Yes - the MP2491NGQB-Z's internally compensated COT control is specifically designed for stable operation with low-ESR ceramic output capacitors. No external type-II or type-III compensation network is required, simplifying layout and reducing component count versus traditional current-mode controllers.
How does the bootstrap capacitor value affect performance?
A 0.1µF ceramic capacitor between BST and SW is recommended. Smaller values (<0.047µF) risk insufficient gate drive during high-duty-cycle operation (e.g., VOUT > 12V), causing HS-FET dropout; larger values (>0.22µF) increase startup time and may degrade transient response due to slower BST recharge.
What is the maximum allowable output voltage ripple at 6A load?
Measured on the EVL2491N-QB-00A evaluation board with 4×22µF X5R output capacitors, peak-to-peak output ripple is ≤35mV at 6A/5V output. This meets typical microprocessor core rail requirements; adding 10µF tantalum or polymer caps further reduces ripple to <15mV.
Does the PG pin require an external pull-up resistor?
Yes - the PG pin is open-drain and must be pulled up to a valid logic rail (e.g., VCC or system 3.3V). A 10kΩ resistor is typical; values <4.7kΩ improve rise time but increase static current, while values >100kΩ risk noise susceptibility in noisy environments.
How is thermal performance affected by PCB copper area?
On a 4-layer 63.5mm×63.5mm PCB with 2oz copper and thermal vias under the exposed pad, case temperature rise is 42°C at 6A/24V→5V. Reducing copper area by 50% increases rise to 68°C - underscoring the necessity of proper thermal pad soldering and ≥4 thermal vias per mm² of pad area.
Is the SS pin compatible with active discharge circuits?
No - the SS pin is designed solely for capacitor-based soft-start ramp generation. Connecting active discharge (e.g., transistor pull-down) violates the internal 9μA current-source architecture and may cause erratic startup behavior or failure to reach regulation. Always use passive RC only.
MP2491NGQB-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 13-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):
- 32V
- Voltage - Output (Min/Fixed):
- 0.5V
- Voltage - Output (Max):
- 30V
- Current - Output:
- 6A
- Frequency - Switching:
- 540kHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 13-QFN (2.5x3)
MP2491NGQB-Z FAQ
1.How can I place an order for MP2491NGQB-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2491NGQB-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 MP2491NGQB-Z reliable?
The price and inventory of MP2491NGQB-Z are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2491NGQB-Z is usually 5 days.
3.What payment methods are accepted for MP2491NGQB-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2491NGQB-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2491NGQB-Z?
MP2491NGQB-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2491NGQB-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 MP2491NGQB-Z?
For technical support, including MP2491NGQB-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2491NGQB-Z requirements.
6.How does Aetrix verify that MP2491NGQB-Z is sourced from the original manufacturer or authorized distributors?
All MP2491NGQB-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 MP2491NGQB-Z meets industry standards.
7.What is the process for return or replacement of MP2491NGQB-Z?
All MP2491NGQB-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2491NGQB-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 MP2491NGQB-Z part is unused and in its original packaging.
Return procedure for MP2491NGQB-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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