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Monolithic Power Systems Inc. MP2491NGQB-P
- Part No.:
- MP2491NGQB-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 13-PowerVFQFN
- Datasheet:
-
MP2491NGQB-P.pdf
- Description:
- IC REG BUCK ADJ 6A 13QFN
- Quantity:
- Payment:
- Shipping:
Inventory:180
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Product details
Overview
MP2491NGQB-P 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) package. It delivers tight regulation across 4V–32V input and 0.5V–30V output ranges, supports configurable soft start and PFM/PWM mode selection, and targets high-efficiency power rails in space-constrained consumer and industrial systems.
For engineers reviewing the MP2491NGQB-P datasheet, MP2491NGQB-P pinout, MP2491NGQB-P application, or MP2491NGQB-P equivalent, key selection criteria include its 540kHz fixed switching frequency, PG open-drain status indication, external bootstrap capacitor requirement, and hiccup-mode over-current protection for short-circuit resilience.
Technical Context
The MP2491NGQB-P implements constant-on-time (COT) control with internal ramp compensation to ensure fast transient response and stable operation with ceramic output capacitors. Its architecture integrates high-side and low-side MOSFETs with dead-time control to prevent shoot-through, and includes an internal 4.44V LDO regulator that remains active even during EN shutdown.
Operation spans forced PWM and auto PFM/PWM modes via the MODE pin, enabling efficiency optimization across load ranges. Over-voltage protection triggers LS-FET discharge when FB exceeds 120% of VREF, while thermal shutdown activates at 165°C with 25°C hysteresis - both verified by characterization per datasheet Rev. 1.0.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4V to 32V - supports wide-range industrial and automotive inputs without pre-regulation |
| Output Current | 6A continuous - enables single-chip power delivery for mid-power SoCs and FPGAs |
| Switching Frequency | Fixed 540kHz - simplifies EMI filtering and inductor selection with predictable noise spectrum |
| Internal MOSFET RDS(on) | 30mΩ (HS) / 20mΩ (LS) - reduces conduction loss and thermal stress at full load |
| Soft Start | Configurable via external capacitor - prevents output overshoot and limits inrush current during startup |
| Power Good Output | Open-drain PG with UV/OV detection - provides system-level sequencing and fault signaling |
| Protection Features | OCP (hiccup), OVP, thermal shutdown, UVLO - ensures robust operation under fault conditions without external circuitry |
Pinout & Package
MP2491NGQB-P is housed in a thermally enhanced QFN-13 package (2.5mm × 3mm, 0.5mm pitch) with exposed thermal pad. The package supports high-current routing and efficient heat dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 IN | Main power input | Drain node of HS-FET; requires local 10µF×3 ceramic decoupling to suppress voltage spikes |
| 2 PGND | Power ground return | Carries high-frequency switching current; must be separated from AGND path to avoid noise coupling |
| 3 VCC | Internal LDO output | Supplies 4.44V to internal logic; requires 2.2µF ceramic decoupling and remains active during EN=low |
| 4 SS | Soft-start timing control | Accepts external capacitor to set startup ramp time; floating prohibited |
| 5,12 NC | No connection | Must be left floating or tied to AGND; no internal connection |
| 6 FB | Feedback sensing | Monitors output via resistor divider; sets VOUT = 0.5V × (1 + R1/R2) |
| 7 AGND | Analog reference ground | Low-noise reference for error amplifier; connect directly to PGND at single point |
| 8 SW | Switch node | Source of HS-FET; connects to inductor and bootstrap capacitor; high dv/dt node |
| 9 BST | Bootstrap supply | Forms floating gate drive rail with SW; requires 0.1µF ceramic capacitor between BST and SW |
| 10 MODE | Operating mode select | Logic level determines PFM/PWM auto-switching (AGND) or forced PWM (VCC) |
| 11 EN | Enable control | Active-high digital enable with 2MΩ internal pull-down; 1.2V threshold enables startup |
| 13 PG | Power good indicator | Open-drain output asserting high when VOUT is within 89–115% of VREF; deglitched for noise immunity |
Key Features
| Feature | Design Value |
|---|---|
| Constant-On-Time (COT) Control | Enables <10µs load transient response and eliminates need for external loop compensation components |
| Integrated Dual MOSFETs | 30mΩ HS + 20mΩ LS switches reduce BOM count and PCB area vs. controller+external FET solutions |
| Configurable Light-Load Mode | Auto PFM/PWM or forced PWM selection optimizes efficiency from 1mA to 6A without audible noise |
| Active Output Discharge | Engages LS-FET during EN deactivation or OVP to rapidly discharge VOUT and prevent backfeed |
| Robust Protection Suite | Hiccup-mode OCP, 120% OVP with recovery, -40°C to +125°C operating range, and 2kV HBM ESD rating |
Applications
| TV Power Management | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Primary 5V/6A rail for LCD backlight drivers and HDMI interface circuitry in 4K smart TVs. IC Role / Device Role / Timing Role: Synchronous buck regulator delivering regulated 5V from 12–24V intermediate bus with PG signaling for system power sequencing. Use Value: 92% peak efficiency at 6A load (VIN=24V) minimizes heatsink requirements in sealed TV enclosures. | Use Scenario: Local 3.3V/6A supply for ARM-based controller and isolated CAN transceivers in DIN-rail mounted PLCs. IC Role / Device Role / Timing Role: Main DC-DC converter providing clean, sequenced power with hiccup-mode OCP to survive field-induced short circuits. Use Value: Wide 4–32V input range accommodates unregulated 24VDC industrial supplies with ±25% tolerance. |
| Network Attached Storage (NAS) | Medical Imaging Front-End |
Use Scenario: 12V-to-5V conversion for dual-core ARM SoC and SATA controller in fanless NAS enclosures. IC Role / Device Role / Timing Role: High-efficiency step-down regulator with soft-start and PG output coordinating boot sequence with FPGA configuration. Use Value: Fixed 540kHz fSW allows predictable EMI filter design meeting CISPR-32 Class B limits without spread-spectrum modulation. | Use Scenario: 24V-to-1.8V/6A supply for high-speed ADC front-end and FPGA signal processing in portable ultrasound units. IC Role / Device Role / Timing Role: Low-noise, tightly regulated power stage supporting 16-bit ADC performance with minimal PSRR degradation. Use Value: COT control achieves <±15mV load regulation (0–6A) ensuring stable reference voltage for precision analog signal chains. |
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-P | Same pinout and package; adds programmable frequency (400–2.2MHz) and adjustable current limit (4–8A) | Requires external resistor network for frequency tuning; higher quiescent current (250μA vs. 220μA) | Select when dynamic frequency scaling or tighter current-limit tolerance is required |
| RT6253BGQW | Different package (QFN-16); 30V input, 5A output, 600kHz fSW, no integrated BST diode | Lacks automatic PFM/PWM mode; requires external bootstrap diode; lower max output current | Choose if board layout already uses RT6253B footprint and 5A suffices |
Compared with MP2491NGQB-P, MP2492NGQB-P offers greater flexibility in frequency and current limit tuning but increases BOM complexity, while RT6253BGQW trades integration for legacy compatibility and reduced feature set - making MP2491NGQB-P optimal for cost-sensitive, space-constrained 6A designs requiring out-of-box stability.
Availability
MP2491NGQB-P is available at Aetrix Electronics and suitable for TV power management, industrial PLC I/O modules, network attached storage (NAS), and medical imaging front-end applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2491NGQB-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 power management ICs, with design centers in the US, China, and Taiwan, and global manufacturing partnerships.
The MP2491N product line delivers fully integrated, high-voltage synchronous buck converters optimized for space-constrained consumer, industrial, and computing applications demanding high efficiency, fast transient response, and comprehensive protection.
FAQ
What is the minimum recommended output capacitance for MP2491NGQB-P?
The datasheet specifies ≥22µF total output capacitance using low-ESR ceramic capacitors. For 5V/6A operation, four 22µF X5R 0805 capacitors (88µF total) are recommended to meet ripple and transient response requirements while maintaining stability under COT control.
Does MP2491NGQB-P require an external bootstrap diode?
No. MP2491NGQB-P integrates a bootstrap charging circuit with internal regulation - only a 0.1µF ceramic capacitor between BST and SW pins is required. Adding an external diode would disrupt the internal charge pump and is not supported.
How does the soft-start time scale with the SS capacitor value?
Soft-start time (ms) = (CSS in nF × 0.5V) / 9μA. For example, a 100nF capacitor yields ~5.6ms ramp time. This linear relationship allows precise control of inrush current and avoids undershoot during startup into large capacitive loads.
Can MP2491NGQB-P operate with input voltage below 4V?
No. The absolute minimum operating input is 4V per datasheet specifications. Below this, UVLO disables the device. The 3.7V typical UVLO rising threshold ensures reliable startup only when sufficient headroom exists for internal LDO and gate drive operation.
What is the thermal resistance (θJA) of MP2491NGQB-P on a standard 4-layer PCB?
On the EVL2491N-QB-00A evaluation board (4-layer, 63.5mm×63.5mm), θJA is 35°C/W. This value assumes full thermal pad soldering and 1-in² copper pour; actual performance depends on PCB stack-up, copper weight, and airflow.
Is the PG pin compatible with 3.3V logic systems?
Yes. PG is an open-drain output requiring an external pull-up to any logic rail (1.8V–5.5V). When pulled to 3.3V, it asserts low (<0.4V at 1mA sink) during faults and floats high during normal operation - fully interoperable with 3.3V microcontrollers and FPGAs.
How does the MODE pin behave during power-up?
The MODE pin must be actively driven to AGND or VCC before EN rises above 1.2V. If left floating during startup, undefined operation may occur. A 100kΩ pull-down to AGND ensures forced PWM mode by default, eliminating startup ambiguity.
MP2491NGQB-P 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-P FAQ
1.How can I place an order for MP2491NGQB-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2491NGQB-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 MP2491NGQB-P reliable?
The price and inventory of MP2491NGQB-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2491NGQB-P is usually 5 days.
3.What payment methods are accepted for MP2491NGQB-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2491NGQB-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2491NGQB-P?
MP2491NGQB-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2491NGQB-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 MP2491NGQB-P?
For technical support, including MP2491NGQB-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2491NGQB-P requirements.
6.How does Aetrix verify that MP2491NGQB-P is sourced from the original manufacturer or authorized distributors?
All MP2491NGQB-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 MP2491NGQB-P meets industry standards.
7.What is the process for return or replacement of MP2491NGQB-P?
All MP2491NGQB-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2491NGQB-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 MP2491NGQB-P part is unused and in its original packaging.
Return procedure for MP2491NGQB-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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