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Monolithic Power Systems Inc. MP2492DN-LF-Z
- Part No.:
- MP2492DN-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP2492DN-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:2,502
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Product details
Overview
MP2492DN-LF-Z from Monolithic Power Systems is a 2A, 55V, 100kHz synchronous step-down DC/DC converter with programmable output current limit via ISP/ISN sensing. It integrates a 0.25Ω internal MOSFET switch, supports 0.8V–15V adjustable output, and delivers stable regulation across 4.5V–55V input for automotive cigarette lighter adapters and USB power supplies.
For engineers reviewing the MP2492DN-LF-Z datasheet, MP2492DN-LF-Z pinout, MP2492DN-LF-Z application, or MP2492DN-LF-Z equivalent, this device offers fixed-frequency current-mode control, cycle-by-cycle overcurrent protection, thermal shutdown, and low-EMI switching-critical for high-reliability 12V/24V/48V industrial and automotive power rails.
Technical Context
The MP2492 operates in current-mode control with a fixed 100kHz oscillator, enabling predictable loop stability and simplified compensation using the SS pin. Its error amplifier compares FB voltage against a precise 0.8V reference (±2.5% over temperature), while the current sense amplifier monitors VISP–VISN differential voltage to enforce 100mV current-limit threshold.
Switching behavior is governed by slope-compensated peak-current modulation: the internal ramp generator sums with the sensed inductor current signal before comparison to the EA output. The BST–SW bootstrap circuit sustains gate drive for the integrated high-side MOSFET, supporting duty cycles up to ~95% when VIN ≥ 16.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5V to 55V - supports direct connection to automotive battery (cold-crank down to 4.5V) and industrial 48V rails without pre-regulation. |
| Output Current | 2A continuous - sustained at full load with SOIC8E or QFN10 package under TA ≤ +85°C with proper PCB copper area. |
| Feedback Reference | 0.8V ±2.5% - enables accurate output setting from 0.8V to 15V using standard resistor dividers; minimizes divider power loss. |
| Current Limit Threshold | 100mV across ISP–ISN - sets precise, programmable output current limit independent of external sense resistor tolerance or DCR drift. |
| Switch RDS(ON) | 0.25Ω - reduces conduction loss at 2A, enabling >85% efficiency at 12VIN/5VOUT across full load range. |
| Switching Frequency | 100kHz fixed - simplifies EMI filtering design and avoids AM radio band; enables use of low-cost, high-saturation inductors. |
| Thermal Shutdown | 150°C junction - protects against sustained overload or poor heatsinking; auto-recovery after cooldown. |
Pinout & Package
MP2492DN-LF-Z is packaged in SOIC8E (exposed pad), with pins arranged as follows:
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VIN) | Power Input | Main supply rail input (4.5–55V); connects to input capacitor and serves as source for internal bias regulator and gate driver. |
| 2 (GND) | Ground Reference | Power ground and feedback reference node; exposed pad must be soldered to PCB ground plane for thermal and noise performance. |
| 3 (EN) | Enable Control | Active-high logic input (1.8V min high, 0.4V max low); enables/disables converter with soft-start initiation on rising edge. |
| 4 (FB) | Feedback Input | Senses output voltage via resistor divider; regulates output to 0.8V reference; bandwidth set by external SS capacitor. |
| 5 (SS) | Soft-Start & Compensation | Controls startup slew rate and provides compensation for current-limit loop; external capacitor sets soft-start time and loop stability. |
| 6 (ISN) | Negative Current Sense | Low-side current sense input; used with ISP to measure VSENSE = VISP – VISN for programmable current limiting. |
| 7 (ISP) | Positive Current Sense | High-side current sense input; differential pair with ISN detects 100mV threshold to trigger constant-current mode. |
| 8 (SW) | Switch Node | Drain of internal MOSFET; connects to inductor and catch diode/capacitor; requires short, low-inductance layout to minimize EMI. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Current Limit | Set precisely to 2A (or lower) using 100mV ISP–ISN threshold-no power loss in sense resistor, no calibration required. |
| Integrated 0.25Ω High-Side MOSFET | Eliminates external switch and driver; reduces BOM count and board space while maintaining >85% efficiency at full load. |
| Stable with Ceramic Output Capacitors | Supports low-ESR X5R/X7R MLCCs only-no electrolytic or tantalum needed; improves reliability and temperature stability. |
| Low-EMI Switching Edges | Controlled dV/dt and dI/dt via internal gate drive optimization-reduces conducted and radiated emissions without snubbers. |
| Cycle-by-Cycle Overcurrent Protection | Real-time peak current limiting per switching cycle-prevents inductor saturation and MOSFET failure during short-circuit events. |
Applications
| USB Power Supplies | Automotive Cigarette Lighter Adapters |
|---|---|
|
Use Scenario: 12V vehicle battery powering 5V/2A USB-A or USB-C PD sink ports. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5V output with programmable 2A current limit to prevent fuse blowout during simultaneous multi-port charging. Use Value: Eliminates need for discrete current-limit IC or fuse; maintains compliance with USB BC1.2 and CDP specifications under varying battery voltage (9–16V). |
Use Scenario: Aftermarket 12V/24V car adapter converting battery voltage to stable 5V/9V/12V for dashcams, GPS, or tire-pressure monitors. IC Role / Device Role / Timing Role: Main DC/DC converter with wide-input operation and thermal protection-survives cold-crank (4.5V) and load-dump (60V transient) conditions. Use Value: Enables single-design compatibility across 12V and 24V commercial vehicles; 55V rating exceeds ISO 7637-2 Pulse 5a requirement. |
| Power Supply for Linear Chargers | Industrial 24V-to-5V Point-of-Load |
|
Use Scenario: Pre-regulator stage feeding linear charger ICs (e.g., TP4056, BQ2407x) in portable medical or handheld test equipment. IC Role / Device Role / Timing Role: Constant-voltage/constant-current buck stage providing clean, ripple-free 5V input to linear charger-minimizing thermal stress on downstream LDO or charger die. Use Value: Programmable current limit prevents overloading upstream source while ensuring sufficient headroom for charger CC/CV transition. |
Use Scenario: Distributed 24V system powering isolated microcontrollers, sensors, and CAN transceivers in factory automation PLC modules. IC Role / Device Role / Timing Role: Robust point-of-load regulator operating from noisy 24V rail; fixed 100kHz frequency avoids interference with CAN FD (2–5Mbps) clock domains. Use Value: Low EMI signature meets CISPR-22 Class B limits; SOIC8E package allows manual rework and conforms to IPC-A-610 Class 3 standards. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 4.5–65V input, 1.5A, 1MHz sync buck; requires external MOSFETs; no integrated current-sense amplifier. | Lacks programmable current limit; suited for higher-frequency, smaller-inductor designs where size > current accuracy. | Select when board space is constrained and 1MHz switching enables <10µH inductors-but adds complexity and cost of dual external FETs. |
| TPS54240DGQR | 3.5–42V input, 2.5A, 100kHz; includes current-sense amp but uses external sense resistor (not DCR); no PGOOD. | Requires 0.01Ω sense resistor (power loss); lacks PGOOD for system sequencing; limited to 42V max input. | Choose if PGOOD is unnecessary and 42V input ceiling suffices-but adds 150mW sense resistor loss at 2A vs. MP2492's zero-loss DCR option. |
Compared with LM5164QPWPRQ1 and TPS54240DGQR, MP2492DN-LF-Z uniquely combines integrated 2A MOSFET, DCR-based current sensing, PGOOD, and 55V rating-making it optimal for cost-sensitive, thermally constrained automotive and industrial 2A buck applications requiring minimal external components.
Availability
MP2492DN-LF-Z is available at Aetrix Electronics and suitable for USB power supplies, automotive cigarette lighter adapters, and industrial 24V-to-5V point-of-load converters requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP2492DN-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 automotive applications.
The MP2492 belongs to MPS's high-voltage buck converter product line, designed specifically for ruggedized 12V/24V/48V systems where input transients, thermal stress, and programmable current limiting are critical design constraints.
FAQ
What is the maximum recommended output current for MP2492DN-LF-Z in SOIC8E package at +85°C ambient?
The MP2492DN-LF-Z delivers 2A continuous output current in SOIC8E package when ambient temperature is ≤+85°C, provided the PCB includes ≥2 sq-in of 2-oz copper connected to the exposed pad for thermal dissipation. Derating begins above +85°C ambient due to thermal shutdown activation at 150°C junction temperature.
Can MP2492DN-LF-Z regulate output current using inductor DCR instead of a sense resistor?
Yes-MP2492DN-LF-Z supports DCR-based current sensing via ISP/ISN pins. The device uses the inductor's DC resistance to generate a proportional voltage drop; an RC network (Ra, Rb, C) filters the DCR signal to reject switching noise while preserving current-limit accuracy within ±10% over temperature.
Does MP2492DN-LF-Z require an external bootstrap diode?
An external bootstrap diode (e.g., BAT54) is recommended when VIN ≤ 6V or VOUT > 12V, or when duty cycle exceeds 65%, to ensure reliable BST capacitor charging. The internal bootstrap regulator may be insufficient under these conditions, risking high-side MOSFET underdrive and efficiency loss.
What is the function of the SS pin beyond soft-start?
The SS pin serves dual roles: (1) controls output voltage ramp rate during startup via external capacitor, and (2) provides compensation for the current-limit loop. Connecting a capacitor here sets both soft-start time and stabilizes the current regulation loop-no additional compensation components are needed.
How does MP2492DN-LF-Z handle short-circuit conditions?
Under short-circuit, MP2492DN-LF-Z enters hiccup mode after three consecutive cycle-by-cycle current limit events: it shuts down for ~30ms, then attempts restart. This limits average power dissipation and prevents thermal runaway while allowing automatic recovery once fault clears-no latch-off or manual reset required.
Is PGOOD functional when the device is in constant-current limit mode?
Yes-PGOOD remains active (high-impedance) as long as FB voltage stays within 90–110% of 0.8V. During constant-current regulation, output voltage may droop below nominal, but PGOOD asserts only if FB falls below 0.72V (90% of 0.8V), indicating loss of regulation-not current limiting itself.
What is the minimum output voltage achievable with MP2492DN-LF-Z?
The minimum regulated output voltage is 0.8V-the internal reference voltage at the FB pin. This is achieved by connecting FB directly to VOUT (i.e., R1 = 0, R2 = open), and is guaranteed across the full operating temperature range (–40°C to +125°C junction).
MP2492DN-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- 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):
- 55V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 15V
- Current - Output:
- 2A
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP2492DN-LF-Z FAQ
1.How can I place an order for MP2492DN-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2492DN-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 MP2492DN-LF-Z reliable?
The price and inventory of MP2492DN-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 MP2492DN-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2492DN-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2492DN-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2492DN-LF-Z?
MP2492DN-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2492DN-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 MP2492DN-LF-Z?
For technical support, including MP2492DN-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2492DN-LF-Z requirements.
6.How does Aetrix verify that MP2492DN-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2492DN-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 MP2492DN-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2492DN-LF-Z?
All MP2492DN-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2492DN-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 MP2492DN-LF-Z part is unused and in its original packaging.
Return procedure for MP2492DN-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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