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Monolithic Power Systems Inc. MP2497DS-LF
- Part No.:
- MP2497DS-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP2497DS-LF.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,752
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Product details
Overview
MP2497DS-LF from Monolithic Power Systems is a 3A, 50V input, fixed 100kHz synchronous step-down DC/DC converter with programmable output overvoltage protection (OVP), internal 0.15Ω MOSFET switch, and output line drop compensation. It delivers stable 0.8V–25V regulated output across 4.5V–50V input range and supports automotive cigarette lighter adapters, USB power supplies, and linear charger power rails.
For engineers reviewing the MP2497DS-LF datasheet, MP2497DS-LF pinout, MP2497DS-LF application, or MP2497DS-LF equivalent, key selection criteria include its 100kHz fixed-frequency current-mode control, hiccup-mode current limiting with ISP/ISN sensing, thermal shutdown at 150°C, and SOIC8 package with exposed pad thermal performance (θJA = 90°C/W).
Technical Context
The MP2497DS-LF implements a current-mode buck architecture with integrated high-side MOSFET, 100mV current-sense threshold, and error amplifier-based feedback loop referenced to 0.8V FB voltage. Its PWM comparator compares ramp-compensated current sense signal against EA output to regulate peak inductor current per cycle.
It integrates programmable OVP via external resistor divider (1.23V reference), load-line compensation using ISP/ISN differential inputs (15–25μA/V gain), and a 4ms internal soft-start timer that resets during hiccup fault recovery. The BST-SW bootstrap circuit enables high-side gate drive without external charge pump.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 50V - Supports wide-range industrial and automotive battery inputs including 12V, 24V, and 48V systems. |
| Output Current | 3A continuous - Sustains full-load operation with SOIC8 package under TA ≤ +85°C and proper PCB copper area. |
| Switching Frequency | Fixed 100kHz - Enables predictable EMI filtering design and avoids AM radio band interference. |
| Feedback Reference | 0.8V ±2% - Sets output voltage accuracy; used with external resistor divider for precise VOUT programming. |
| OVP Threshold Reference | 1.23V ±10% - Enables adjustable overvoltage trip point (e.g., 6V) via external R-divider on OVP pin. |
| Current Sense Threshold | 100mV - Defines hiccup current limit; allows accurate load-current monitoring and line-drop compensation. |
| Thermal Shutdown | 150°C with 30°C hysteresis - Protects die during sustained overload; resumes operation only after junction cools to 120°C. |
| Internal MOSFET RDS(ON) | 0.15Ω - Reduces conduction loss at 3A, enabling >90% efficiency at mid-load with optimized external components. |
Pinout & Package
MP2497DS-LF is housed in an 8-pin SOIC package (SOIC8) with exposed thermal pad (GND-connected) for enhanced heat dissipation. Package dimensions comply with JEDEC MS-012 variation AA; recommended land pattern includes solder paste stencil for exposed pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Accepts 4.5–50V unregulated supply; connects to input capacitor (CIN) placed adjacent to minimize switching noise injection. |
| GND (Pin 2) | Power and signal ground reference | Reference node for FB, OVP, and current sense; exposed pad must be soldered to large GND plane for thermal and noise integrity. |
| FB (Pin 3) | Feedback input | Senses divided output voltage; EA regulates VOUT to maintain 0.8V at this pin; frequency foldback activates if FB < 250mV. |
| OVP (Pin 4) | Overvoltage protection input | Monitors output via resistor divider; triggers immediate high-side switch disable when voltage exceeds 1.23V reference. |
| ISN (Pin 5) | Negative current sense input | Differential input for RSENSE or inductor DCR sensing; enables hiccup current limit and line-drop compensation. |
| ISP (Pin 6) | Positive current sense input | Differential input paired with ISN; provides bidirectional current information for load regulation and fault detection. |
| BST (Pin 7) | Bootstrap supply | Connects to SW via 0.1µF ceramic capacitor; powers internal high-side gate driver; optional external diode improves startup at low VIN. |
| SW (Pin 8) | Switch node | Drain of internal MOSFET; connects to inductor and bootstrap capacitor; requires short, low-inductance layout to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output OVP | Configurable trip point (e.g., 6V) using two-resistor divider on OVP pin-enables system-level fault containment without external supervisor IC. |
| Output Line Drop Compensation | Adjusts FB voltage dynamically based on load current sensed at ISP/ISN-maintains constant voltage at remote load despite trace resistance up to ~50mΩ. |
| Hiccup-Mode Current Limit | Shuts down SW, resets soft-start, and retries after fault-limits average short-circuit current to safe level while preventing thermal runaway. |
| Low-EMI Switching Edges | Controlled tRISE/tFALL (~50ns) and minimized parasitic ringing-reduces conducted and radiated emissions without added snubbers. |
| Stable with Ceramic Output Caps | Compensated for low-ESR capacitors (X5R/X7R)-eliminates need for electrolytic bulk caps and simplifies layout in space-constrained designs. |
| Integrated Bootstrap Regulator | On-chip LDO charges BST capacitor from VIN-removes need for external bootstrap diode in most applications, reducing BOM count. |
Applications
| Automotive Cigarette Lighter Adapter | USB-C PD Power Delivery Sink |
|---|---|
|
Use Scenario: Converts 12V–24V vehicle battery to stable 5V/3A for charging smartphones and tablets via USB-A ports. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 5V rail with OVP set to 5.5V to protect downstream USB controllers. Use Value: Maintains ±1% output regulation across cold-crank (6.5V) to load-dump (40V) transients while suppressing EMI to meet CISPR 25 Class 5 limits. |
Use Scenario: Supplies 5V/3A to USB-C PD controller IC (e.g., TUSB320) and associated level shifters in portable power banks. IC Role / Device Role / Timing Role: Secondary-stage buck converter delivering clean, low-noise 5V bus; operates in fixed 100kHz mode to avoid interference with USB 2.0 data lines. Use Value: Delivers >92% efficiency at 2A load with ceramic-only output capacitance, enabling compact, fanless enclosure design. |
| Linear Charger Power Supply | Industrial 24V-to-5V Point-of-Load |
|
Use Scenario: Powers standalone Li-ion linear charger IC (e.g., MCP73831) from 12V–36V industrial supply with tight thermal constraints. IC Role / Device Role / Timing Role: Pre-regulator stepping down input to 5.5V before linear charger's input-reducing power dissipation in linear stage by >70%. Use Value: Programmable OVP prevents overvoltage damage to charger IC during transient events; hiccup limit protects against battery short-circuit faults. |
Use Scenario: Provides 5V/3A to FPGA I/O banks or microcontroller peripherals in factory automation PLC modules operating from 24V rail. IC Role / Device Role / Timing Role: Isolated point-of-load converter with line-drop compensation-ensures stable 5.00V ±10mV at 15cm remote load connector. Use Value: ISP/ISN sensing enables real-time current monitoring for predictive maintenance; thermal shutdown prevents field failure during ambient >85°C operation. |
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 | Lower 36V max input, 2A output, same SOIC8 package and pinout. | Lacks OVP programming and line-drop compensation; suitable only for non-critical 12V/24V systems without remote loads. | Select when cost sensitivity outweighs OVP and load regulation requirements; not drop-in for MP2497DS-LF designs. |
| LM5164QDDARQ1 | Automotive-grade (AEC-Q100), 100V input, 0.6A output, 1.5MHz switching, different pinout and control scheme. | Requires external MOSFETs and compensation network; designed for harsh-environment automotive body electronics. | Choose for ASIL-B functional safety compliance or >50V input; not compatible due to topology, pinout, and feature mismatch. |
Compared with MP2494DS-LF, MP2497DS-LF adds OVP configurability and line-drop compensation essential for remote-load reliability; versus LM5164QDDARQ1, it trades automotive qualification and higher voltage rating for lower BOM cost, simpler layout, and integrated power stage.
Availability
MP2497DS-LF is available at Aetrix Electronics and suitable for automotive cigarette lighter adapters, USB power supplies, and industrial 24V-to-5V point-of-load converters requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MP2497DS-LF 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 mixed-signal ICs for power management, motion control, and interface applications.
The MP2497 belongs to MPS's high-voltage buck converter product line, engineered for robust operation in automotive, industrial, and consumer power systems where wide input range, integrated protection, and layout simplicity are critical.
FAQ
What is the maximum output voltage achievable with MP2497DS-LF?
The MP2497DS-LF supports output voltages from 0.8V to 25V when VIN > 26.5V, and up to (VIN – 1.5V) when VIN ≤ 26.5V. This limitation ensures sufficient headroom for internal regulation and switch operation. For example, at VIN = 12V, maximum VOUT is 10.5V; at VIN = 50V, VOUT can reach 25V using appropriate feedback resistors.
How does the ISP/ISN differential pair enable line-drop compensation?
The ISP and ISN pins sense voltage across an external sense resistor (RSENSE) or inductor DCR. The MP2497 injects a current proportional to load current into the FB node via internal 400kΩ resistor, offsetting the feedback voltage to raise VOUT as load increases-counteracting IR drop across PCB traces. Compensation gain is 15–25μA/V and programmable via RSENSE value.
Can MP2497DS-LF operate without an external bootstrap diode?
Yes-the MP2497DS-LF integrates an internal bootstrap regulator that charges the BST capacitor from VIN. An external diode (e.g., BAT54) is only recommended for applications with VIN ≤ 5V, VOUT > 12V, or duty cycle > 65%, where internal charging may be insufficient to sustain high-side gate drive. Most 12V–24V designs operate reliably without it.
What is the purpose of the 250mV FB voltage threshold in frequency foldback?
When FB falls below 250mV-indicating severe overload or short-circuit-the MP2497 reduces switching frequency to limit power dissipation and prevent thermal runaway. This foldback behavior lowers average input current during fault conditions, complementing hiccup-mode shutdown and improving system robustness without requiring external circuitry.
Is MP2497DS-LF pin-compatible with other MPS buck converters?
No-MP2497DS-LF uses a proprietary 8-pin SOIC layout optimized for current-mode control, OVP, and dual current sense inputs. It is not pin-compatible with MP2307, MP2317, or MP2451. Pin mapping differs significantly in function assignment (e.g., ISP/ISN vs. CS/COMP), requiring dedicated PCB layout and schematic review for any replacement.
How is the hiccup current limit threshold adjusted externally?
The default hiccup threshold is 100mV across RSENSE, corresponding to IOUT = 100mV / RSENSE. To reduce short-circuit current, RS1 and RS2 resistors (RS1 = RS2) are added between ISP/ISN and GND per Figure 4 in the datasheet. This creates a current sink that lowers effective sense voltage, allowing programmable short-circuit current as low as ~0.5A depending on RS1 value and RSENSE.
Does MP2497DS-LF support synchronization to an external clock?
No-MP2497DS-LF features a fixed 100kHz internal oscillator with no external sync input. Frequency tolerance is ±20% (80–120kHz) over temperature and line. For synchronized multi-rail designs, consider MPS's MPQ4331 or MPQ4363 families, which offer SYNC pin capability and tighter frequency accuracy.
MP2497DS-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for MP2497DS-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2497DS-LF 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 reliable?
The price and inventory of MP2497DS-LF 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 is usually 5 days.
3.What payment methods are accepted for MP2497DS-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2497DS-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2497DS-LF?
MP2497DS-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2497DS-LF 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?
For technical support, including MP2497DS-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2497DS-LF requirements.
6.How does Aetrix verify that MP2497DS-LF is sourced from the original manufacturer or authorized distributors?
All MP2497DS-LF 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 meets industry standards.
7.What is the process for return or replacement of MP2497DS-LF?
All MP2497DS-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP2497DS-LF, 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 part is unused and in its original packaging.
Return procedure for MP2497DS-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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