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Monolithic Power Systems Inc. MP2497DS-LF-Z
- Part No.:
- MP2497DS-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP2497DS-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 3A 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,122
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Product details
Overview
MP2497DS-LF-Z 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 high-side MOSFET, and dual 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 automotive cigarette lighter adapters and USB power supplies requiring robust fault protection.
For engineers reviewing the MP2497DS-LF-Z datasheet, MP2497DS-LF-Z pinout, MP2497DS-LF-Z application, or MP2497DS-LF-Z equivalent, this device offers confirmed design support for wide-input industrial power rails, programmable OVP threshold via external resistor divider, thermal shutdown at 150°C, and SOIC8 package compatibility with exposed-pad thermal enhancement in the DS-LF-Z variant.
Technical Context
The MP2497DS-LF-Z implements peak-current-mode control with integrated 100kHz oscillator, slope compensation, and error amplifier driving an RS flip-flop PWM stage. Its ISP/ISN differential sense inputs enable precise 100mV current-limit threshold detection and programmable load-line compensation via external RSENSE and feedback resistor scaling.
It integrates a bootstrap gate driver (BST pin), internal 4ms soft-start circuit, and OVP comparator referenced to 1.23V - all operating within a -40°C to +125°C junction temperature range. Protection features include hiccup-mode current limit, short-circuit shutdown, and thermal foldback with 30°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 50V - supports direct connection to 12V/24V/48V automotive and industrial bus rails without pre-regulation. |
| Output Current | 3A continuous - sustained delivery with thermal derating per SOIC8 θJA = 90°C/W and 1.38W max PD at 25°C ambient. |
| Switching Frequency | Fixed 100kHz - enables predictable EMI filtering and stable loop compensation without external frequency programming. |
| Feedback Reference | 0.8V ±2% - sets output voltage accuracy; used with external resistor divider for 0.8V–25V adjustment range. |
| OVP Threshold Reference | 1.23V ±10% - defines overvoltage trip point; programmed externally via resistor divider on OVP pin. |
| Current Sense Threshold | 100mV - triggers hiccup current limit; configurable lower via external resistors during short-circuit conditions. |
| Internal MOSFET RDS(ON) | 0.15Ω - reduces conduction loss at 3A, enabling >90% efficiency at 12V→5V/3A per typical curves. |
Pinout & Package
MP2497DS-LF-Z uses the SOIC8 package (3.9mm × 4.9mm, 1.27mm pitch) with exposed thermal pad (GND-connected) for enhanced heat dissipation. Pin 1 is marked by notch or dot; pin numbering follows standard SOIC convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN (Pin 1) | Main power input | Accepts 4.5–50V unregulated supply; powers internal circuitry and serves as drain node for internal MOSFET. |
| GND (Pin 2) | Power and signal ground | Reference for FB, OVP, ISP/ISN; exposed pad must be soldered to PCB ground plane for thermal and noise integrity. |
| FB (Pin 3) | Output voltage feedback | Monitors divided output voltage; regulates to 0.8V reference; disables switching if <250mV during fault. |
| OVP (Pin 4) | Overvoltage protection input | Compares external resistor-divided VOUT against 1.23V reference; latches off SW upon overvoltage event. |
| ISN (Pin 5) | Negative current sense | Differential input paired with ISP; measures voltage across RSENSE or inductor DCR for current limiting and line drop compensation. |
| ISP (Pin 6) | Positive current sense | Differential input paired with ISN; enables accurate load-current monitoring independent of ground path noise. |
| BST (Pin 7) | Bootstrap capacitor connection | Forms floating supply for high-side gate drive; requires 0.1µF ceramic capacitor between BST and SW pins. |
| SW (Pin 8) | Switch node output | Source of internal MOSFET; connects to inductor; high dv/dt node requiring tight layout and minimal trace length. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output OVP | Set via external resistor divider on OVP pin using 1.23V internal reference - enables safe operation with varying output loads and cable lengths. |
| Output Line Drop Compensation | Adjusts FB voltage based on load current sensed at ISP/ISN - maintains constant voltage at remote load despite IR drop in PCB traces or cables. |
| Hiccup-Mode Current Limit | Shuts down SW and restarts after soft-start reset when VISP–ISN exceeds 100mV - prevents thermal runaway during sustained overload or short circuit. |
| Low-EMI Switching Edges | Controlled tRISE/tFALL ≤50ns and optimized layout guidance - meets EN55022 Class B radiated emissions without added shielding. |
| Stable with Ceramic Output Caps | Designed for low-ESR ceramic capacitors (X5R/X7R) - eliminates need for electrolytic bulk caps and simplifies layout in space-constrained designs. |
Applications
| USB Power Supplies | Automotive Cigarette Lighter Adapters |
|---|---|
|
Use Scenario: 12V vehicle battery powering 5V/3A USB-A or USB-C PD sink ports with cable voltage drop compensation. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V output; ISP/ISN inputs monitor load current to dynamically adjust FB voltage and maintain 5V at connector end. Use Value: Eliminates need for post-regulator LDOs or remote sensing wires - achieves ±1% load regulation across 0–3A and 0.5mΩ–50mΩ trace resistance. |
Use Scenario: 24V commercial truck electrical system powering portable tools or diagnostics equipment via 12V/3A output. IC Role / Device Role / Timing Role: High-input-voltage step-down controller with OVP set to 13.2V to protect downstream 12V-rated devices from alternator surge events. Use Value: Withstands 50V transients and provides hiccup-mode protection during motor stall or shorted tool leads - avoids fuse replacement in field service. |
| Power Supply for Linear Chargers | Industrial 24V-to-12V Point-of-Load Conversion |
|
Use Scenario: Pre-regulating 24V rail to 12.6V for Li-ion linear charger ICs (e.g., MCP73831) in portable medical devices. IC Role / Device Role / Timing Role: Constant-voltage buck stage preceding linear charger; OVP configured to 13.0V to prevent battery overcharge during charger IC failure. Use Value: Reduces thermal stress on linear charger by limiting input voltage swing - extends battery lifetime and improves safety certification margin. |
Use Scenario: Converting 24V factory automation bus to 12V for PLC I/O modules with long interconnect wiring. IC Role / Device Role / Timing Role: Fixed-frequency buck converter with programmable line-drop compensation - adjusts output to offset 0.3V IR drop across 2m of 22AWG cable. Use Value: Maintains 12V ±2% at module input under full 3A load - avoids brownout resets and ensures deterministic digital I/O timing. |
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, same SOIC8 package and pinout. | Lacks ISP/ISN pins and line-drop compensation; no programmable OVP - limited to fixed-output, low-transient environments. | Select only if input never exceeds 36V and load regulation tolerance >±5% is acceptable. |
| LM5164QDDARQ1 | Automotive-grade 100V input, 300mA output, external MOSFET required; 400kHz–2.2MHz sync capability. | Requires external high-side FET and current-sense amp; no integrated OVP or line-drop compensation logic. | Choose for AEC-Q100 compliance and >60V transient immunity - but adds BOM cost and layout complexity. |
Compared with MP2494DS-LF-Z, MP2497DS-LF-Z delivers higher input voltage resilience and precision load regulation; versus LM5164QDDARQ1, it trades automotive qualification for integrated power stage simplicity and lower system-level component count in non-automotive industrial use cases.
Availability
MP2497DS-LF-Z is available at Aetrix Electronics and suitable for USB power supplies, automotive cigarette lighter adapters, and industrial 24V-to-12V point-of-load conversion requiring stable component supply, RoHS-compliant packaging, and SOIC8 thermal performance.
Supply support for MP2497DS-LF-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 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, designed specifically for rugged industrial and transportation systems where wide input range, fault resilience, and layout simplicity are critical.
FAQ
What is the maximum recommended output current for MP2497DS-LF-Z in SOIC8 package at 60°C ambient?
At 60°C ambient, the SOIC8 package's thermal resistance (θJA = 90°C/W) limits continuous output current to approximately 2.4A assuming 1.38W max power dissipation and 150°C max junction temperature. Derating curves in the datasheet confirm ≥2.2A at 60°C with 200mm² 2oz copper pour under the exposed pad.
Can MP2497DS-LF-Z operate with input voltage below 4.5V?
No - the absolute minimum operating input voltage is 4.5V per the Recommended Operating Conditions table. Below this, UVLO (2.9V–3.9V threshold) prevents startup, and internal bias circuits cannot sustain regulation. For sub-4.5V inputs, consider MPS's MP2315 or MP9486 families.
How is output line drop compensation implemented without external op-amps?
MP2497DS-LF-Z injects a current proportional to load current (via ISP/ISN differential sense) into the top feedback resistor R1. This biases the FB node upward as load increases, raising VOUT to counteract IR drop - all using internal transconductance amplifiers and no external active components.
Does the OVP function latch or auto-recover after fault clearance?
OVP causes immediate SW shutdown and enters a timer-based latch-off state. Recovery requires cycling VIN or asserting a hard reset - there is no automatic retry. This prevents repeated stress on downstream components during persistent overvoltage faults.
Is an external bootstrap diode required for 12V input operation?
An external bootstrap diode (e.g., BAT54) is recommended for 12V input only if duty cycle exceeds 65% (i.e., VOUT > 7.8V) or if efficiency degradation is observed. The internal bootstrap regulator suffices for 12V→5V operation per typical application data.
What is the minimum recommended output capacitance for stability?
The datasheet specifies stable operation with ≥22µF total ceramic output capacitance (C4 in typical schematic). Lower values risk phase margin erosion; X5R/X7R dielectrics are mandatory - aluminum electrolytics alone will not ensure loop stability.
How does hiccup-mode current limiting differ from constant-current foldback?
Hiccup mode fully disables switching, resets soft-start, and attempts restart after FB falls below 0.3V - resulting in intermittent 4ms bursts of activity. Foldback would continuously regulate at reduced voltage/current; MP2497's hiccup behavior minimizes average power dissipation during sustained shorts.
MP2497DS-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- 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-Z FAQ
1.How can I place an order for MP2497DS-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2497DS-LF-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 MP2497DS-LF-Z reliable?
The price and inventory of MP2497DS-LF-Z 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-Z is usually 5 days.
3.What payment methods are accepted for MP2497DS-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2497DS-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2497DS-LF-Z?
MP2497DS-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2497DS-LF-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 MP2497DS-LF-Z?
For technical support, including MP2497DS-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2497DS-LF-Z requirements.
6.How does Aetrix verify that MP2497DS-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2497DS-LF-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 MP2497DS-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2497DS-LF-Z?
All MP2497DS-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2497DS-LF-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 MP2497DS-LF-Z part is unused and in its original packaging.
Return procedure for MP2497DS-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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