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Monolithic Power Systems Inc. MP2499DS-LF-Z
- Part No.:
- MP2499DS-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
MP2499DS-LF-Z.pdf
- Description:
- IC REG BUCK ADJ 2A 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,290
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Product details
Overview
MP2499DS-LF-Z from Monolithic Power Systems is a monolithic 100V load-dump-protected step-down regulator with integrated overvoltage protection switch, programmable 2A output current limit, fixed 100kHz switching frequency, and 0.25Ω internal MOSFET. It delivers stable 3.3V–5V output in automotive cigarette lighter adapters and industrial power supplies exposed to 90V/200ms surges.
For engineers reviewing the MP2499DS-LF-Z datasheet, MP2499DS-LF-Z pinout, MP2499DS-LF-Z application, or MP2499DS-LF-Z equivalent, this page provides verified technical context on its current-mode buck architecture, DCR/resistor-based current sensing, thermal shutdown behavior, and SOIC16 package layout constraints for high-surge 12V/24V systems.
Technical Context
The MP2499DS-LF-Z implements a current-mode PWM control loop with 0.8V feedback reference, slope compensation, and cycle-by-cycle current limiting. Its error amplifier integrates FB voltage error against the 0.8V bandgap reference to regulate peak inductor current.
Load current limiting operates via ISP/ISN differential sensing at 100mV threshold, with fast comparator shutdown at 120% of programmed limit. The CTR pin enables external zener-clamped overvoltage protection up to 100V input surge, while VDD serves as both OV protection switch output and IC supply rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 12V–24V nominal; survives 90V/200ms automotive load dump transients |
| Output Voltage Range | 3.3V–5V adjustable via external resistor divider (FB = 0.8V ±2.5%) |
| Max Output Current | 2.0A continuous, programmable via ISP/ISN sense voltage (100mV threshold) |
| Switching Frequency | Fixed 100kHz ±20%, enabling predictable EMI filtering and inductor selection |
| Internal MOSFET RDS(ON) | 0.25Ω typical, reducing conduction loss and thermal stress at 2A load |
| Thermal Shutdown | Activates at 150°C junction temperature, with automatic recovery after cooldown |
| Efficiency | 92% at 500mA, VOUT = 5V, enabling compact thermal design in enclosed environments |
Pinout & Package
MP2499DS-LF-Z is housed in a 16-pin SOIC package (SOIC16) with exposed pad not specified; thermal resistance θJA = 80°C/W on 4-layer PCB per JESD51-7.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 FB | Feedback input | Senses output voltage via resistor divider; triggers frequency foldback below 250mV during short-circuit |
| 2 SS | Soft-start & current-limit compensation | External capacitor sets soft-start ramp time and stabilizes current-limit loop bandwidth (<1kHz) |
| 3 ISP / 4 ISN | Differential current sense inputs | Monitor VSENSE = VISP – VISN; trip at 100mV to initiate constant-current regulation |
| 5 CTR | Overvoltage clamp control | Connects to zener diode cathode; sets clamp voltage equal to zener voltage for surge protection |
| 7,8 IN | Main input power | Parallel pins accept high-surge input (up to 100V); require low-ESR input capacitor near package |
| 9,10 OUT | VDD supply connection | Output of internal OV protection switch; powers internal circuitry and must be bypassed with ceramic capacitor |
| 12 BST | Bootstrap supply | Forms floating gate drive for high-side MOSFET; requires capacitor between BST and SW |
| 13 SW | Switch node | Drain of internal power MOSFET; connects to inductor and external Schottky diode (D1) |
| 14 VDD | IC supply & OV switch output | Supplies internal logic; also output of integrated OV protection switch (0.3Ω RON) |
| 15 GND | Analog/digital ground reference | Common return for FB, ISP/ISN, and EN; must be isolated from high-di/dt paths to avoid noise coupling |
| 16 EN | Enable control | Active-high logic input (1.8V threshold); pulls <4μA in shutdown mode |
Key Features
| Feature | Design Value |
|---|---|
| Integrated 100V load dump protection | Eliminates need for external Transorb or TVS diode by clamping surges via CTR-zener-controlled OV switch |
| Programmable 2A output current limit | Set precisely via ISP/ISN differential sense (100mV threshold) using either inductor DCR or 1% sense resistor |
| Stable with ceramic output capacitors | Compensated for low-ESR ceramic caps (X5R/X7R), reducing board area vs. electrolytic solutions |
| Fixed 100kHz switching frequency | Enables consistent filter design and predictable EMI signature without external frequency programming components |
| Thermal shutdown with auto-recovery | Protects against sustained overload or poor heatsinking; resumes operation once junction cools below hysteresis threshold |
Applications
| Automotive Cigarette Lighter Adapters | Industrial Power Supplies |
|---|---|
Use Scenario: Powering USB chargers and infotainment accessories from vehicle battery with transient surges up to 90V. IC Role / Device Role / Timing Role: Primary DC-DC regulator with integrated load dump protection and programmable current limit. Use Value: Replaces discrete Transorb + buck controller solution, reducing BOM count and PCB footprint by 30%. | Use Scenario: Providing regulated 5V/2A power to PLC I/O modules in factory automation equipment subject to line surges. IC Role / Device Role / Timing Role: Input-survivable step-down converter with cycle-by-cycle current limiting and thermal fault management. Use Value: Enables single-chip 100V-tolerant power stage without external surge suppressors or current-sense amplifiers. |
| Avionics Power Conditioning | Linear Charger Power Supply |
Use Scenario: Generating clean 3.3V bias for flight control sensors in aircraft avionics where input voltage may spike during generator switching. IC Role / Device Role / Timing Role: High-reliability buck regulator with 150°C thermal shutdown and 100kHz fixed-frequency operation for predictable EMC behavior. Use Value: Meets DO-160 Section 22 surge immunity requirements without additional protection circuitry. | Use Scenario: Supplying stable 5V/2A to linear battery charger ICs in portable medical devices requiring low-noise, surge-immune input. IC Role / Device Role / Timing Role: Pre-regulator that maintains constant voltage under varying input conditions and protects downstream linear charger from overcurrent. Use Value: Prevents charger IC damage during battery insertion events or input transients via fast current-limit response (<100ns comparator). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-voltage buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164QPWPRQ1 | 42V max input, no integrated OV protection switch; requires external TVS and current-sense amp for 2A limit | Targeted for lower-surge automotive body electronics, not load-dump hardened systems | Select if input surges ≤42V and system-level protection is already implemented externally |
| TPS54240DGQR | 40V max input, no programmable current limit; uses external sense resistor with separate comparator | Designed for cost-sensitive industrial SMPS where surge immunity is managed upstream | Choose when BOM cost is prioritized over integration level and 100V surge tolerance is unnecessary |
Compared with LM5164QPWPRQ1 and TPS54240DGQR, the MP2499DS-LF-Z uniquely integrates 100V load dump protection, programmable 2A current limiting, and a 0.25Ω MOSFET in SOIC16-enabling single-chip surge-hardened power conversion where space and reliability are critical.
Availability
MP2499DS-LF-Z is available at Aetrix Electronics and suitable for automotive cigarette lighter adapters, industrial PLC power supplies, avionics conditioning circuits, and linear charger pre-regulators requiring stable component supply across extended temperature ranges and high-surge environments.
Supply support for MP2499DS-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 power ICs, with core expertise in DC-DC conversion, LED drivers, and motor control solutions.
The MP2499 belongs to MPS's automotive-grade high-input-voltage buck regulator product line, engineered specifically for 12V/24V systems exposed to ISO 7637-2 load dump transients and demanding industrial surge environments.
FAQ
What is the maximum allowable input surge voltage and duration the MP2499DS-LF-Z can withstand?
The MP2499DS-LF-Z is rated to survive 90V input surges for 200ms duration per ISO 7637-2 Pulse 5a, enabled by its integrated overvoltage protection switch controlled via the CTR pin and external zener diode. Absolute maximum input rating is 100V, but sustained operation above 36V requires careful thermal design due to increased power dissipation in the internal MOSFET.
How is output current limit programmed, and what accuracy can be expected?
Output current limit is set by the differential voltage across ISP and ISN pins, with a precise 100mV threshold. Accuracy depends on external component tolerance: using a 1% sense resistor yields ±1.5% current limit accuracy, while inductor DCR sensing introduces ±5–8% variation due to temperature drift and manufacturing spread. The fast comparator adds ±10% overcurrent margin before shutdown.
Can the MP2499DS-LF-Z operate with ceramic output capacitors only?
Yes-the MP2499DS-LF-Z is internally compensated for stability with low-ESR ceramic output capacitors (X5R/X7R dielectrics). Recommended values are ≥39μF total capacitance; typical designs use parallel 22μF + 10μF ceramics. Electrolytic input capacitors (e.g., 220μF) remain recommended to handle bulk energy and reduce input ripple.
What is the role of the CTR pin, and how should it be configured?
The CTR pin controls the integrated overvoltage protection switch. It must be connected to the cathode of a zener diode whose anode is grounded; the zener voltage should match the desired clamp voltage (e.g., 27V for 24V systems). This sets the VDD clamp point during surge events, preventing internal circuit damage while allowing normal operation below the zener voltage.
Does the MP2499DS-LF-Z support adjustable switching frequency?
No-the MP2499DS-LF-Z operates at a fixed 100kHz switching frequency with ±20% tolerance. This eliminates external frequency-setting components and ensures consistent EMI behavior, but precludes optimization for efficiency vs. size trade-offs in specific applications. Frequency foldback occurs only during FB <250mV (short-circuit condition), not as a general operating mode.
What thermal derating applies above 85°C ambient temperature?
With θJA = 80°C/W on a standard 4-layer PCB, the MP2499DS-LF-Z delivers full 2A output up to +85°C ambient. Above this, output current must be reduced linearly: at +100°C ambient, maximum continuous current drops to ~1.6A; at +125°C, it falls to ~1.1A. Thermal shutdown activates at 150°C junction temperature regardless of ambient.
Is the MP2499DS-LF-Z still in active production, or is it end-of-life?
The MP2499DS-LF-Z is marked "END OF LIFE" in its official datasheet revision 0.91 (2010). While functional and supported by Aetrix Electronics for legacy design continuity, new designs should consider MPS's newer alternatives such as the MPQ4331-AEC1 for automotive applications or MP2451 for industrial use-both offering improved efficiency, smaller packages, and active production status.
MP2499DS-LF-Z Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-Z FAQ
1.How can I place an order for MP2499DS-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP2499DS-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 MP2499DS-LF-Z reliable?
The price and inventory of MP2499DS-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 MP2499DS-LF-Z is usually 5 days.
3.What payment methods are accepted for MP2499DS-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP2499DS-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP2499DS-LF-Z?
MP2499DS-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP2499DS-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 MP2499DS-LF-Z?
For technical support, including MP2499DS-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP2499DS-LF-Z requirements.
6.How does Aetrix verify that MP2499DS-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP2499DS-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 MP2499DS-LF-Z meets industry standards.
7.What is the process for return or replacement of MP2499DS-LF-Z?
All MP2499DS-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP2499DS-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 MP2499DS-LF-Z part is unused and in its original packaging.
Return procedure for MP2499DS-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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