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Monolithic Power Systems Inc. MP2499DS-LF
- Part No.:
- MP2499DS-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP2499DS-LF.pdf
- Description:
- IC REG BUCK ADJ 2A 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,781
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Product details
Overview
MP2499DS-LF from Monolithic Power Systems is a monolithic 100V load dump-protected step-down regulator with integrated overvoltage protection switch, programmable 2A output current limit, and fixed 100kHz switching frequency. It delivers stable 3.3V–5V output across 12V/24V automotive and industrial input rails, featuring 0.25Ω internal high-side MOSFET, cycle-by-cycle current limiting, and thermal shutdown - deployed in cigarette lighter adapters and linear charger power supplies.
For engineers reviewing the MP2499DS-LF datasheet, MP2499DS-LF pinout, MP2499DS-LF application, or MP2499DS-LF equivalent, key selection criteria include its 100V surge tolerance, DCR- or resistor-based current sensing architecture, SOIC16 package thermal resistance (θJA = 80°C/W), and compatibility with low-ESR ceramic output capacitors.
Technical Context
The MP2499DS-LF implements current-mode control with a 100kHz fixed-frequency PWM oscillator and slope compensation to stabilize the peak-current loop. Its error amplifier references a precise 0.8V internal bandgap, and feedback voltage regulation is achieved via external resistor divider on the FB pin.
Load current limiting operates independently via ISP/ISN differential sensing at 100mV threshold, with fast comparator override at 120% of programmed limit. The CTR pin enables zener-clamped overvoltage protection up to 100V, while the integrated OV switch isolates VDD during transients - critical for 12V/24V battery systems exposed to ISO 7637-2 load dump events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 12V–24V nominal; survives 100V/200ms surge - meets automotive load dump immunity requirements |
| Output Current Limit | Programmable up to 2.0A via ISP/ISN sense voltage (100mV threshold) - supports DCR or precision resistor sensing |
| Switching Frequency | Fixed 100kHz ±20% - enables predictable EMI filtering and simplifies inductor selection |
| Internal High-Side RDS(ON) | 0.25Ω - reduces conduction loss at 2A, enabling >92% efficiency at 500mA/5V output |
| Feedback Reference Voltage | 0.80V ±2.5% - sets output via external resistor divider; enables 3.3V–5V adjustment |
| Thermal Shutdown Threshold | 150°C - protects die under sustained overload or poor PCB heatsinking |
| UVLO Threshold | 3.3V (rising) with 200mV hysteresis - ensures clean start-up after brownout recovery |
Pinout & Package
MP2499DS-LF is housed in a 16-pin SOIC package (SOIC16) with standard 1.27mm pitch and exposed pad not present. Thermal resistance θJA = 80°C/W on 4-layer JEDEC PCB per JESD51-7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback Input | Connects to resistor divider midpoint; regulates output voltage to 0.8V reference; triggers frequency foldback below 250mV during short circuit |
| 2 SS | Soft-Start & Compensation | External capacitor sets soft-start time and stabilizes current-limit loop bandwidth (<1kHz) |
| 3 ISP / 4 ISN | Differential Current Sense Inputs | Sense voltage across external resistor or inductor DCR; 100mV threshold initiates constant-current regulation |
| 5 CTR | Overvoltage Clamp Control | Tied to zener diode; sets clamp voltage for integrated 100V OV protection switch |
| 7,8 IN | High-Voltage Input Supply | Parallel pins accept 12V/24V battery input and withstand 100V transients; connect directly to input capacitor |
| 9,10 OUT | Regulated Output & VDD Source | Delivers regulated output; also powers internal circuitry when VDD is derived from output |
| 12 BST | Bootstrap Capacitor Node | Forms floating gate drive supply for high-side MOSFET; connected between SW and BST |
| 13 SW | Switch Node | Drain of internal high-side MOSFET; connects to inductor; carries high dv/dt switching waveform |
| 14 VDD | Internal Supply & OV Switch Output | Output of integrated OV protection switch; powers IC core; must be bypassed with local ceramic capacitor |
| 15 GND | Analog & Power Ground | Reference for FB, ISP/ISN, and EA; requires star-point layout outside high-current return path to minimize noise coupling |
| 16 EN | Enable Control | Active-high logic input; <0.4V disables device; >1.8V enables operation; bias current ±10μA |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100V Load Dump Protection | On-chip OV switch clamps surges without external Transorb, reducing BOM count and board space in automotive front-end designs |
| Programmable 2A Output Current Limit | Configurable via ISP/ISN with 100mV threshold - supports accurate current regulation using either inductor DCR or 1% sense resistor |
| Stable Operation with Ceramic Output Capacitors | Compensated for low-ESR ceramic caps (X5R/X7R); eliminates need for bulk electrolytic output capacitance in space-constrained applications |
| Fixed 100kHz Switching Frequency | Enables consistent EMI filter design and predictable inductor sizing; avoids audible noise in sensitive environments |
| Thermal Shutdown + Cycle-by-Cycle Current Limit | Dual fault protection prevents damage during overload, short-circuit, or inadequate heatsinking - critical for unattended industrial power supplies |
Applications
| Automotive Cigarette Lighter Adapters | Power Supply for Linear Chargers |
|---|---|
Use Scenario: 12V vehicle battery powering USB charging ports via cigarette lighter socket, subject to ISO 7637-2 load dump transients. IC Role / Device Role / Timing Role: Primary buck regulator with integrated 100V OV protection switch and programmable 2A current limit. Use Value: Eliminates need for external TVS/transorb; maintains regulated 5V output during 100V/200ms surges without shutdown or latch-off. |
Use Scenario: Dedicated 5V/2A supply for lithium-ion linear charger ICs in portable medical or test equipment. IC Role / Device Role / Timing Role: Constant-voltage/constant-current pre-regulator upstream of linear charger; provides precise current-limited source. Use Value: Programmable 2A limit prevents overcurrent stress on downstream charger; soft-start prevents inrush into large battery charge capacitors. |
| Industrial 24V Power Supplies | Avionics Power Conditioning |
Use Scenario: DIN-rail mounted 24V-to-5V converter for PLC I/O modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Robust buck controller handling wide line variation and repetitive surge events. Use Value: 0.25Ω RDS(ON) and thermal shutdown ensure reliability at full 2A load; SOIC16 allows conformal coating and mechanical ruggedization. |
Use Scenario: Secondary power rail generation in airborne avionics units requiring MIL-STD-704F transient immunity. IC Role / Device Role / Timing Role: Load-dump protected DC-DC stage converting 28V aircraft bus to stable 3.3V/5V logic rails. Use Value: CTR-zener clamp configuration enables precise 28V±10% overvoltage protection; 150°C junction rating supports extended temperature operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck regulator with current limiting applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QDGSRQ1 | 42V max input, 1.5A output, adjustable frequency (100kHz–2.2MHz), no integrated OV switch | Lacks 100V surge protection; requires external TVS and current-sense amplifier for 2A limit | Preferred where higher frequency or smaller inductors are needed, but adds complexity for load dump immunity |
| TPS54240DGQR | 42V max input, 2.5A output, adjustable frequency (50kHz–500kHz), no integrated OV switch or current-sense inputs | Requires external current-sense resistor + op-amp for current limiting; no built-in load dump protection | Suitable for cost-sensitive industrial designs where transients are suppressed externally and layout space permits added components |
Compared with LM5164QDGSRQ1 and TPS54240DGQR, MP2499DS-LF uniquely integrates both 100V load dump protection and ISP/ISN current sensing in SOIC16 - reducing component count by ≥4 parts and eliminating external surge suppression in automotive front-end designs.
Availability
MP2499DS-LF is available at Aetrix Electronics and suitable for automotive cigarette lighter adapters, industrial 24V power supplies, and avionics power conditioning requiring stable component supply amid end-of-life transitions.
Supply support for MP2499DS-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 power ICs, with design centers in the US, China, and Taiwan.
The MP2499 belongs to MPS's automotive-grade buck regulator product line, engineered specifically for 12V/24V systems exposed to load dump and cold-crank conditions - prioritizing surge resilience, current accuracy, and minimal external component count.
FAQ
What is the maximum continuous output current of MP2499DS-LF?
The MP2499DS-LF supports up to 2.0A continuous output current when thermally managed within its SOIC16 θJA = 80°C/W limit and operated within –40°C to +125°C junction temperature range. Peak current capability depends on inductor saturation rating and PCB copper area for heat dissipation.
Can MP2499DS-LF operate without an external bootstrap capacitor?
No. An external bootstrap capacitor between BST and SW pins is mandatory to drive the gate of the internal high-side MOSFET above the input voltage. Omitting it prevents proper switch turn-on and causes immediate functional failure or erratic regulation.
How is output voltage set on MP2499DS-LF?
Output voltage is set using a resistor divider from VOUT to GND, with the FB pin connected to the divider midpoint. The internal 0.8V reference determines VOUT = 0.8V × (1 + R1/R2). Recommended R1 = 300kΩ for optimal loop stability and transient response.
Does MP2499DS-LF require external current-sense resistors?
Not necessarily. It supports both DCR sensing (using inductor winding resistance) and discrete sense resistors. When using DCR, external resistors Ra/Rb configure gain; with a precision resistor, current limit is simply IOUT = 100mV / RSENSE, enabling ±1% accuracy with 1% tolerance parts.
What is the role of the CTR pin in MP2499DS-LF?
The CTR pin connects to a zener diode referenced to GND and sets the clamp voltage for the integrated 100V overvoltage protection switch. Selecting a zener voltage equal to the nominal output (e.g., 5.1V for 5V output) ensures minimal power loss during surge events while maintaining precise clamping behavior.
Is MP2499DS-LF still in active production?
No - MP2499DS-LF is marked END OF LIFE per its official revision 0.91 datasheet dated November 2010. Aetrix Electronics maintains limited legacy inventory and supports obsolescence mitigation through cross-reference analysis and alternative sourcing guidance.
MP2499DS-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-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):
- 12V
- Voltage - Input (Max):
- 24V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- 5V
- 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:
- 16-SOIC
MP2499DS-LF FAQ
1.How can I place an order for MP2499DS-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2499DS-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 MP2499DS-LF reliable?
The price and inventory of MP2499DS-LF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MP2499DS-LF is usually 5 days.
3.What payment methods are accepted for MP2499DS-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2499DS-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2499DS-LF?
MP2499DS-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2499DS-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 MP2499DS-LF?
For technical support, including MP2499DS-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2499DS-LF requirements.
6.How does Aetrix verify that MP2499DS-LF is sourced from the original manufacturer or authorized distributors?
All MP2499DS-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 MP2499DS-LF meets industry standards.
7.What is the process for return or replacement of MP2499DS-LF?
All MP2499DS-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP2499DS-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 MP2499DS-LF part is unused and in its original packaging.
Return procedure for MP2499DS-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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