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Monolithic Power Systems Inc. MP2497DN-LF
- Part No.:
- MP2497DN-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP2497DN-LF.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:4,133
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Product details
Overview
MP2497DN-LF from Monolithic Power Systems is a 3A, 50V, 100kHz monolithic synchronous step-down DC/DC converter with programmable output overvoltage protection (OVP), internal 0.15Ω power MOSFET, and integrated current-sense inputs (ISP/ISN) for hiccup-mode current limiting and output line drop compensation. It operates from 4.5V to 50V input, delivers adjustable output from 0.8V to 25V, and targets USB power supplies and automotive cigarette lighter adapters.
For engineers reviewing the MP2497DN-LF datasheet, MP2497DN-LF pinout, MP2497DN-LF application, or MP2497DN-LF equivalent, key selection criteria include its fixed 100kHz switching frequency, SOIC8E package with exposed thermal pad, 4ms internal soft-start, ±2% feedback reference accuracy, and ability to maintain stable regulation under wide input/output conditions with ceramic output capacitors.
Technical Context
The MP2497DN-LF implements current-mode control with a 100kHz oscillator, slope-compensated PWM comparator, and integrated error amplifier referenced to a 0.8V FB threshold. Its ISP/ISN differential current sense interface enables precise load-current monitoring for both hiccup current limiting (100mV threshold) and programmable line-drop compensation via external RSENSE and feedback resistor scaling.
OVP protection uses a dedicated 1.23V reference comparator on the OVP pin, latching off the high-side switch upon overvoltage detection. Thermal shutdown activates at 150°C with 30°C hysteresis, and the internal bootstrap regulator supports gate drive for the integrated MOSFET without requiring an external diode in most configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 50V - Supports wide-range industrial and automotive inputs including 12V/24V/48V systems. |
| Output Current | 3A continuous - Delivers full rated current with SOIC8E package's 2.5W power dissipation capability. |
| Switching Frequency | 100kHz fixed - Enables predictable EMI filtering and simplifies magnetics design with standard 33µH inductors. |
| Feedback Reference | 0.8V ±2% - Sets output voltage via external resistor divider; stable over −40°C to +125°C junction temperature. |
| OVP Threshold Reference | 1.23V - Programmable output overvoltage protection using external resistor divider on OVP pin. |
| Current Sense Threshold | 100mV - Hiccup-mode current limit trigger; allows accurate sensing with RSENSE or inductor DCR. |
| Internal MOSFET RDS(ON) | 0.15Ω - Reduces conduction loss and eliminates need for external high-side switch in buck topology. |
| Soft-Start Time | 4ms internal - Prevents inrush current during startup without requiring external timing components. |
Pinout & Package
MP2497DN-LF is housed in an SOIC8E (exposed pad) package optimized for thermal performance, with the exposed pad electrically connected to GND and requiring direct PCB copper pour connection for effective heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Power Input | Primary supply input (4.5–50V); connects to input capacitor and serves as power source for internal circuitry and high-side switch drain. |
| GND (Pin 2) | Ground Reference | System ground reference for FB, OVP, ISP/ISN, and BST; exposed pad must be soldered to GND plane for thermal and electrical integrity. |
| FB (Pin 3) | Feedback Input | Senses output voltage via resistor divider; regulates output to 0.8V reference; triggers frequency foldback if <250mV during fault. |
| OVP (Pin 4) | OVP Sense Input | Monitors output via resistor divider; compares to 1.23V internal reference; disables SW and latches after delay on overvoltage event. |
| ISN (Pin 5) | Negative Current Sense | Differential input for current-sense amplifier; used with ISP to detect load current for hiccup limit and line-drop compensation. |
| ISP (Pin 6) | Positive Current Sense | Differential input paired with ISN; enables accurate current measurement across RSENSE or inductor DCR. |
| BST (Pin 7) | Bootstrap Supply | Connects to SW via 0.1µF capacitor; provides floating gate-drive voltage for internal high-side MOSFET. |
| SW (Pin 8) | Switch Node | Drain of internal high-side MOSFET and source of low-side path; connects to inductor and bootstrap capacitor. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output OVP | Set via external resistor divider on OVP pin using 1.23V internal reference - enables system-level safety without external supervisor IC. |
| Output Line Drop Compensation | Adjusts FB voltage based on load current sensed at ISP/ISN - maintains constant voltage at remote load despite PCB trace resistance. |
| Stable with Ceramic Output Capacitors | Designed for low-ESR ceramic caps (e.g., X5R/X7R) - eliminates need for bulk electrolytic capacitors and improves long-term reliability. |
| Hiccup-Mode Current Limit | Shuts down SW and restarts with full soft-start upon >100mV sense voltage - protects against sustained overload while minimizing thermal stress. |
| Low-EMI Switching Edges | Controlled rise/fall times (50ns each) and optimized layout guidance - reduces conducted and radiated emissions without added snubbers. |
Applications
| USB Power Supplies | Automotive Cigarette Lighter Adapters |
|---|---|
Use Scenario: 5V/3A USB charging port powered from vehicle battery (9–16V nominal, up to 50V during load dump). IC Role / Device Role / Timing Role: Primary buck regulator providing regulated 5V output with OVP set to 6V to protect connected devices. Use Value: Internal 0.15Ω MOSFET and 50V rating eliminate need for external HV FET; SOIC8E thermal pad sustains 3A continuous under high ambient temperatures. | Use Scenario: Compact 12V-to-5V adapter plugged into automotive 12V socket, powering portable electronics. IC Role / Device Role / Timing Role: Step-down controller managing variable input (12V±20%) and delivering stable 5V with line-drop compensation for cable losses. Use Value: ISP/ISN current sensing enables accurate load-current monitoring; programmable OVP prevents damage during transient overvoltage events. |
| Power Supply for Linear Chargers | Industrial 24V-to-5V/3.3V Conversion |
Use Scenario: Pre-regulator stage feeding linear charger ICs (e.g., TP4056) in battery-powered equipment. IC Role / Device Role / Timing Role: Efficient intermediate voltage conversion ensuring clean, stable input to linear regulator with minimal dropout. Use Value: Fixed 100kHz frequency simplifies EMI compliance; 0.8V FB reference allows precise output setting for optimal linear regulator headroom. | Use Scenario: DIN-rail mounted industrial controller requiring isolated 5V/3.3V rails from unregulated 24V supply. IC Role / Device Role / Timing Role: Non-isolated buck converter delivering primary system rail with robust fault protection and thermal resilience. Use Value: −40°C to +125°C operating range and hiccup protection ensure reliability in harsh environments; SOIC8E package supports high-power density layout. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2494DN-LF | 2A rated, 40V max input, same SOIC8E package and pinout | Limited to lower current and input voltage; lacks line-drop compensation | Select when 2A output suffices and OVP programmability is not required. |
| LM5164QDGSRQ1 | 3A, 100V input, 100kHz, but requires external MOSFETs and has different pinout | Supports higher input voltage and AEC-Q100 qualification; no integrated current sense for line compensation | Choose for automotive applications needing >50V input tolerance and functional safety compliance. |
Compared with MP2494DN-LF, MP2497DN-LF delivers higher current and adds line-drop compensation; versus LM5164QDGSRQ1, it integrates power switches and current sensing but lacks AEC-Q100 rating and ultra-high input voltage support.
Availability
MP2497DN-LF is available at Aetrix Electronics and suitable for USB power supplies, automotive cigarette lighter adapters, and industrial 24V-to-5V conversion requiring stable component supply, RoHS-compliant packaging, and long-term lifecycle continuity.
Supply support for MP2497DN-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 automotive applications.
The MP2497 belongs to MPS's high-voltage buck converter product line, designed specifically for cost-sensitive, space-constrained applications requiring wide-input operation, integrated protection, and minimal external components.
FAQ
What is the maximum recommended output voltage for MP2497DN-LF when input voltage is ≤26.5V?
The maximum output voltage is VIN – 1.5V. For example, with a 24V input, the highest safe output is 22.5V. This constraint ensures sufficient headroom for internal regulation and prevents overstress of the feedback amplifier and OVP comparator circuits under varying load and temperature conditions.
Can MP2497DN-LF operate without an external bootstrap diode?
Yes - the internal bootstrap regulator can charge the BST capacitor directly in most applications. An external diode (e.g., BAT54) is only recommended for 5V fixed-input systems, high-duty-cycle operation (>65%), or VOUT >12V to improve gate-drive reliability and efficiency under heavy load.
How is output line drop compensation implemented using ISP and ISN pins?
ISP and ISN form a differential pair measuring voltage across RSENSE. The resulting current is injected into the top feedback resistor (R1) to raise FB voltage proportionally to load current, counteracting voltage drop across PCB traces. Compensation gain is set by RSENSE value and R1 selection per the formula R1 = (RTRACE × 400kΩ) / RSENSE.
What thermal derating applies to MP2497DN-LF in SOIC8E package at 85°C ambient?
With θJA = 50°C/W and TJ(MAX) = 125°C, maximum allowable power dissipation at 85°C ambient is (125 – 85) / 50 = 0.8W. At 3A output and typical 5V operation, this corresponds to ~1.6A continuous current before thermal limiting engages - confirming need for adequate copper pour on the exposed pad.
Is MP2497DN-LF pin-compatible with MP2497DS-LF?
No - MP2497DN-LF uses SOIC8E (exposed pad) while MP2497DS-LF uses standard SOIC8. Pin numbering is identical, but the exposed pad on DN variant must be connected to GND for thermal and electrical performance; DS lacks this pad and has higher thermal resistance (θJA = 90°C/W).
What is the minimum recommended output capacitor ESR for stable operation?
No minimum ESR is required - MP2497DN-LF is explicitly designed for stability with low-ESR ceramic capacitors (X5R/X7R). Typical designs use 22µF to 100µF ceramic output caps; adding bulk electrolytic is unnecessary and may degrade phase margin due to ESL effects.
MP2497DN-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- 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-SOICE
MP2497DN-LF FAQ
1.How can I place an order for MP2497DN-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2497DN-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 MP2497DN-LF reliable?
The price and inventory of MP2497DN-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2497DN-LF is usually 5 days.
3.What payment methods are accepted for MP2497DN-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2497DN-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2497DN-LF?
MP2497DN-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2497DN-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 MP2497DN-LF?
For technical support, including MP2497DN-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2497DN-LF requirements.
6.How does Aetrix verify that MP2497DN-LF is sourced from the original manufacturer or authorized distributors?
All MP2497DN-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 MP2497DN-LF meets industry standards.
7.What is the process for return or replacement of MP2497DN-LF?
All MP2497DN-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP2497DN-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 MP2497DN-LF part is unused and in its original packaging.
Return procedure for MP2497DN-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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