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Monolithic Power Systems Inc. MP2497DS-LF-P
- Part No.:
- MP2497DS-LF-P
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP2497DS-LF-P.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,273
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Product details
Overview
MP2497DS-LF-P from Monolithic Power Systems is a 3A, 50V input, fixed-frequency (100kHz) synchronous step-down DC/DC converter with programmable output overvoltage protection (OVP), internal 0.15Ω MOSFET switch, and dual current-sense inputs (ISP/ISN) for hiccup-mode current limiting and output line drop compensation. It delivers stable 0.8–25V adjustable output in automotive cigarette lighter adapters and USB power supplies.
For engineers reviewing the MP2497DS-LF-P datasheet, MP2497DS-LF-P pinout, MP2497DS-LF-P application, or MP2497DS-LF-P equivalent, key selection criteria include its 4.5–50V input range, 100mV current sense threshold, 1.23V OVP reference, thermal shutdown at 150°C, and SOIC8 package with exposed pad thermal performance.
Technical Context
The MP2497DS-LF-P implements current-mode control with integrated PWM comparator, error amplifier, and 100kHz oscillator. Its ISP/ISN differential sensing enables precise load-current monitoring for both hiccup current limiting and programmable line-drop compensation via external RSENSE and feedback resistor scaling.
It features a dedicated OVP comparator referenced to 1.23V, independent of FB regulation, allowing fault-triggered immediate high-side switch disable. The internal bootstrap regulator charges the BST capacitor, supporting gate drive above VIN, with optional external diode support for high-duty-cycle operation (>65%) or low-input (5V) systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 50V - supports wide-range industrial and automotive battery inputs without pre-regulation. |
| Output Current | 3A continuous - sustained delivery with thermal shutdown protection at 150°C junction temperature. |
| Switching Frequency | Fixed 100kHz - enables predictable EMI filtering and simplifies inductor selection (e.g., 33µH). |
| Feedback Reference | 0.8V ±2% - sets output voltage via external resistor divider; stable over –40°C to +125°C. |
| OVP Threshold Reference | 1.23V ±13% - defines programmable overvoltage trip point using external resistive divider on OVP pin. |
| Current Sense Threshold | 100mV - triggers hiccup-mode current limit; allows accurate setting via RSENSE or inductor DCR. |
| Internal MOSFET RDS(ON) | 0.15Ω - reduces conduction loss and eliminates need for external high-side switch. |
| Soft Start Time | Internal 4ms - prevents inrush current during startup without external capacitor. |
Pinout & Package
MP2497DS-LF-P is housed in an 8-pin SOIC package with exposed thermal pad (SOIC8E-compatible footprint), optimized for PCB heat dissipation (θJA = 50°C/W). Pin 2 (GND) connects directly to the exposed pad for low-impedance thermal and electrical grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Unregulated input supply | Accepts 4.5–50V; powers internal circuitry and serves as drain node for internal MOSFET. |
| GND (Pin 2) | Power and signal ground reference | Primary ground return; exposed pad must be soldered to PCB GND plane for thermal management. |
| FB (Pin 3) | Feedback voltage input | Senses output via resistor divider; regulates VOUT to 0.8V reference; disables frequency foldback below 250mV. |
| OVP (Pin 4) | Overvoltage protection input | Monitors output via separate resistor divider; trips shutdown when voltage exceeds 1.23V reference. |
| ISN (Pin 5) | Negative current sense input | Differential input with ISP; measures voltage across RSENSE or inductor DCR for current limiting. |
| ISP (Pin 6) | Positive current sense input | Differential input with ISN; enables line-drop compensation by injecting current into FB divider. |
| BST (Pin 7) | Bootstrap supply for high-side gate drive | Connects to SW via 0.1µF capacitor; internal regulator charges BST to enable full gate drive above VIN. |
| SW (Pin 8) | Switch node output | Source of internal MOSFET; connects to inductor; requires tight layout to minimize EMI and ringing. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output OVP | Set via external resistor divider on OVP pin using 1.23V internal reference - enables system-level fault isolation without secondary supervision IC. |
| Output Line Drop Compensation | Configurable via RSENSE and top feedback resistor (R1) - maintains constant load voltage despite trace resistance up to ~50mΩ at 3A. |
| Hiccup-Mode Current Limit | Auto-restarts after fault removal with full 4ms soft start - prevents thermal runaway during sustained overload or short-circuit conditions. |
| Low-EMI Switching Edges | Controlled tRISE/tFALL ≈ 50ns - reduces high-frequency harmonics and eases EN55022 compliance without added snubbers. |
| Stable with Ceramic Output Caps | Compatible with low-ESR X5R/X7R MLCCs - eliminates need for electrolytic capacitors and improves long-term reliability. |
| Integrated Bootstrap Regulator | On-chip charge pump for BST capacitor - removes requirement for external bootstrap diode in most 12–24V applications. |
Applications
| USB Power Supplies | Automotive Cigarette Lighter Adapters |
|---|---|
|
Use Scenario: 5V/3A USB charging port powered from 12V vehicle battery with transient spikes up to 50V during load dump. IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 5V output; handles input transients and load steps without dropout. Use Value: Internal 50V rating and hiccup protection ensure uninterrupted operation during cold-crank (6V) and load-dump (50V) events per ISO 7637-2. |
Use Scenario: Compact 12V-to-5V adapter plugged into car cigarette lighter socket powering dashcams or portable routers. IC Role / Device Role / Timing Role: High-efficiency step-down converter with thermal shutdown and OVP - prevents overheating in enclosed enclosures. Use Value: SOIC8E package with exposed pad sustains 3A output at +85°C ambient without heatsink; 100kHz switching avoids AM radio band interference. |
| Power Supply for Linear Chargers | Industrial 24V-to-5V Point-of-Load Conversion |
|
Use Scenario: Pre-regulator stage feeding a linear charger IC (e.g., TP4056) requiring clean, stable 5V input from 9–36V industrial rail. IC Role / Device Role / Timing Role: Efficient intermediate converter minimizing power loss before low-noise LDO or linear charger stage. Use Value: 0.8V FB reference and line-drop compensation maintain ±1% output accuracy across 0–3A load, critical for precise CC/CV charging. |
Use Scenario: Embedded controller board requiring isolated 5V rail from noisy 24V factory automation bus with EMI constraints. IC Role / Device Role / Timing Role: EMI-optimized buck converter with controlled edges and ceramic-cap stability - meets Class B conducted emissions limits. Use Value: Fixed 100kHz frequency enables deterministic filter design; low EMI signature reduces need for ferrite beads or shielding cans. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2494DS-LF-Z | Lower 36V max input, 2A output, no ISP/ISN pins - lacks line-drop compensation and programmable OVP. | Suitable only for fixed 5V/2A applications without dynamic load compensation or OVP flexibility. | Select when cost sensitivity outweighs programmability and 50V robustness; not drop-in compatible due to missing pins. |
| LM5164QDDARQ1 | 42V max input, 1.5A, 100–2.2MHz adjustable frequency, integrated high-side FET - no OVP pin or line-drop compensation. | Targets automotive infotainment with spread-spectrum EMI reduction, but requires external OVP circuitry. | Choose for higher-frequency designs needing smaller magnetics; adds complexity for OVP and line-drop functions. |
Compared with MP2497DS-LF-P, MP2494DS-LF-Z sacrifices input voltage headroom and advanced protection features for lower cost, while LM5164QDDARQ1 trades integrated OVP and line-drop capability for frequency flexibility and AEC-Q100 qualification - neither matches MP2497's combination of 50V rating, 3A output, and dual-sense programmability in SOIC8.
Availability
MP2497DS-LF-P is available at Aetrix Electronics and suitable for USB power supplies, automotive cigarette lighter adapters, and industrial point-of-load conversion requiring stable component supply across extended temperature and input voltage ranges.
Supply support for MP2497DS-LF-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, with focus on DC/DC converters, LED drivers, and motor drivers for industrial, automotive, and consumer markets.
The MP2497 belongs to MPS's high-voltage buck converter product line, designed specifically for rugged 4.5–50V input applications where reliability under transient stress and programmable protection are critical.
FAQ
What is the maximum recommended output voltage for MP2497DS-LF-P when input voltage is 50V?
The MP2497DS-LF-P supports output voltages up to 25V when VIN > 26.5V, per its Recommended Operating Conditions. This limit ensures safe operation of internal circuitry and maintains regulation stability across the full input range. Exceeding 25V risks violating absolute maximum ratings on FB and OVP pins.
Can MP2497DS-LF-P operate without an external bootstrap diode?
Yes - the MP2497DS-LF-P integrates an internal bootstrap regulator that charges the BST capacitor via the SW node. An external diode (e.g., BAT54) is only recommended for 5V input systems, high-duty-cycle operation (>65%), or outputs above 12V to improve gate drive margin and efficiency.
How is output line drop compensation implemented using ISP and ISN pins?
ISP and ISN form a differential current-sense input. When configured with RSENSE, the device injects a current proportional to load current into the top feedback resistor (R1), raising FB voltage to counteract trace IR drop. Compensation gain is set by RSENSE and RTRACE per Equation (7) in the datasheet.
What thermal derating applies to MP2497DS-LF-P in SOIC8E package at 85°C ambient?
In SOIC8E package (θJA = 50°C/W), maximum continuous power dissipation at 85°C ambient is PDMAX = (125°C − 85°C)/50°C/W = 0.8W. At typical 85% efficiency delivering 3A @ 5V (15W out), this corresponds to ~2.6W loss - requiring careful layout and copper area to avoid thermal shutdown.
Is the 100mV current sense threshold fixed or adjustable?
The 100mV threshold is fixed internally for hiccup current limiting. However, the effective current limit can be adjusted externally: using RSENSE yields ILIM = 100mV/RSENSE; using inductor DCR gives ILIM = 100mV/DCR. Short-circuit current can be further reduced via RS1/RS2 resistors per Figure 4.
Does MP2497DS-LF-P support synchronization to an external clock?
No - the MP2497DS-LF-P uses an internal fixed-frequency 100kHz oscillator with no external sync input. Frequency variation is limited to ±20% (80–120kHz) over temperature and input voltage, as specified in Electrical Characteristics.
What is the minimum output capacitance required for stable operation?
The MP2497DS-LF-P is stable with low-ESR ceramic capacitors; typical designs use ≥22µF (e.g., 22µF + 100µF). Stability is confirmed with phase margin >45° across load and line variations, as shown in the Loop Gain plot (Figure 5). X5R/X7R dielectrics are strongly recommended.
MP2497DS-LF-P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- MP
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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):
- 4.5V
- Voltage - Input (Max):
- 50V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 25V
- Current - Output:
- 3A
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOIC
MP2497DS-LF-P FAQ
1.How can I place an order for MP2497DS-LF-P through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2497DS-LF-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 MP2497DS-LF-P reliable?
The price and inventory of MP2497DS-LF-P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2497DS-LF-P is usually 5 days.
3.What payment methods are accepted for MP2497DS-LF-P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2497DS-LF-P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2497DS-LF-P?
MP2497DS-LF-P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2497DS-LF-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 MP2497DS-LF-P?
For technical support, including MP2497DS-LF-P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2497DS-LF-P requirements.
6.How does Aetrix verify that MP2497DS-LF-P is sourced from the original manufacturer or authorized distributors?
All MP2497DS-LF-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 MP2497DS-LF-P meets industry standards.
7.What is the process for return or replacement of MP2497DS-LF-P?
All MP2497DS-LF-P units undergo pre-shipment inspection (PSI). If there is an issue with MP2497DS-LF-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 MP2497DS-LF-P part is unused and in its original packaging.
Return procedure for MP2497DS-LF-P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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