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Monolithic Power Systems Inc. MP24971DN-LF-Z
- Part No.:
- MP24971DN-LF-Z
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP24971DN-LF-Z.pdf
- Description:
- IC REG BUCK 5V 1.5A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:3,975
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Product details
Overview
MP24971DN-LF-Z from Monolithic Power Systems is a monolithic 5V fixed-output, 1.5A continuous step-down DC/DC converter with programmable current limit and output line-drop compensation. It operates from 8V to 50V input, integrates a 0.4Ω internal MOSFET, delivers 5V ±3% output regulation, and features hiccup-mode over-current protection and thermal shutdown. It is used in automotive power adapters where wide-input, stable 5V rail generation under varying trace impedance is required.
For engineers reviewing the MP24971DN-LF-Z datasheet, MP24971DN-LF-Z pinout, MP24971DN-LF-Z application, or MP24971DN-LF-Z equivalent, key selection criteria include its 100kHz fixed switching frequency, 5V fixed output with line-drop compensation, SOIC8E package with exposed thermal pad, 4ms internal soft-start, and integrated OVP (6V threshold) for USB and automotive supply designs.
Technical Context
The MP24971DN-LF-Z implements current-mode control with a 100kHz oscillator, using an internal ramp generator and PWM comparator to regulate peak inductor current. Its error amplifier compares VOS-sensed output voltage against an 800mV reference, enabling precise 5V regulation across load and line variations.
Current sensing occurs differentially across ISP/ISN pins with a 100mV threshold, triggering hiccup-mode shutdown on over-current. Output line-drop compensation is implemented via VOC pin feedback, allowing dynamic adjustment of VFB based on sensed load current through RSENSE and external RC network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5V ±3% (4.85–5.15V); fixed internal reference ensures stable USB-compliant rail without external resistors. |
| Max Continuous Output Current | 1.5A; sustained delivery under full load at 12V–50V input with proper thermal layout on SOIC8E package. |
| Input Voltage Range | 8V to 50V; supports 12V/24V/48V automotive and industrial bus inputs without pre-regulation. |
| Switching Frequency | 100kHz (±30%); fixed frequency enables predictable EMI filtering and simplifies inductor selection (e.g., 33µH). |
| Internal MOSFET RDS(ON) | 0.4Ω typ.; reduces conduction loss and eliminates need for external high-side switch in compact 5V supplies. |
| Output Over-Voltage Protection | 6V threshold (5.69–6.2V); latches off SW pin upon open-sense fault, protecting downstream 5V logic loads. |
| Soft-Start Duration | 4ms typ.; limits inrush current during power-up, preventing input rail collapse in battery-fed systems. |
| Thermal Shutdown | 150°C junction temperature; self-protects during overload or poor PCB heatsinking; recovers after cooldown. |
Pinout & Package
MP24971DN-LF-Z is housed in an SOIC8E (exposed pad) package, optimized for thermal performance with direct GND pad connection. The exposed thermal pad must be soldered to a large PCB copper area for θJA = 50°C/W operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Unregulated Input Supply | Accepts 8–50V; connects to input capacitor bank; also powers internal bias circuitry and gate driver. |
| 2 GND | Ground Reference & Thermal Pad | Primary ground return; exposed pad must be connected to solid GND plane for thermal dissipation and noise immunity. |
| 3 VOS | Output Voltage Sense Input | Direct connection to regulated 5V output; enables accurate remote sensing and tight load regulation. |
| 4 VOC | Line-Drop Compensation Adjust | Connects to GND via resistor to program load-line gain; compensates for IR drop across long PCB traces. |
| 5 ISN | Negative Current Sense Input | Differential input with ISP; senses voltage across RSENSE to trigger hiccup current limit at 100mV. |
| 6 ISP | Positive Current Sense Input | Differential input with ISN; enables accurate current monitoring and short-circuit protection down to 200mV output. |
| 7 BST | Bootstrap Supply for High-Side Driver | Connects via 0.1µF capacitor to SW; provides gate drive voltage >VIN for internal N-MOSFET. |
| 8 SW | Switch Node Output | Drains internal MOSFET; connects to inductor and external Schottky diode; high dv/dt node requiring tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Line-Drop Compensation | VOC pin allows resistor-based gain tuning (200–700mV per 50–100mV sense) to maintain constant 5V at load point despite trace resistance. |
| Hiccup-Mode Current Limit | Auto-restarts after fault clears; limits average short-circuit current to <100mA using RS1/RS2 programming resistors. |
| Stable with Ceramic Output Capacitors | Supports low-ESR X5R/X7R ceramics (e.g., 22µF + 100µF), eliminating electrolytic bulk caps and improving reliability. |
| Low-EMI Switching Edges | Controlled tRISE (50–100ns) and tFALL (85–150ns) reduce high-frequency harmonics, easing EN55022 compliance. |
| Integrated 5V Reference & Error Amplifier | Eliminates external feedback divider; 800mV internal reference referenced to VOS enables precise 5V output without tolerance stacking. |
Applications
| USB Power Supplies | Automotive Power Adapters |
|---|---|
|
Use Scenario: Providing regulated 5V/1.5A to USB peripherals from 12V vehicle battery with long harness wiring. IC Role / Device Role / Timing Role: Primary buck regulator with line-drop compensation correcting for up to 300mV IR drop between PCB and connector. Use Value: Maintains 5.0V ±50mV at USB port under full load, avoiding enumeration failures caused by voltage sag. |
Use Scenario: Powering infotainment head units or ADAS cameras from 24V truck electrical system with transient-heavy environment. IC Role / Device Role / Timing Role: Fixed-frequency step-down controller with 6V OVP and thermal shutdown ensuring safe operation during load dump events. Use Value: Survives 60V input transients (within absolute max rating) and sustains 1.5A output without derating at 85°C ambient. |
| Power Supplies for Linear Chargers | Industrial 5V Auxiliary Rails |
|
Use Scenario: Generating clean 5V bias for linear battery chargers (e.g., TP4056) in portable medical devices. IC Role / Device Role / Timing Role: Low-noise, fixed-output DC/DC stage preceding LDO; soft-start prevents charger IC reset during power-on. Use Value: Delivers 5V with <20mVpp ripple (typ.) and 0.1% load regulation, enabling accurate charge voltage reference. |
Use Scenario: Powering isolated communication interfaces (RS-485, CAN transceivers) in factory automation PLC modules. IC Role / Device Role / Timing Role: Robust 5V source tolerant of 50V surges and operating down to –40°C with guaranteed 1.5A output. Use Value: Enables uninterrupted operation during brownouts; SOIC8E package supports conformal coating and extended thermal cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MP2494DN-LF-Z | 40V max input, 1.2A output, no line-drop compensation, 500kHz switching. | Suitable for space-constrained 5V rails where higher frequency allows smaller magnetics but sacrifices EMI headroom. | Select when input ≤40V and board area is critical; avoid if trace compensation or 50V surge immunity is required. |
| LM5164QDDARQ1 | Automotive-grade (AEC-Q100), 100V input, adjustable output, requires external feedback resistors. | Used in ASIL-B systems needing diagnostic coverage, wider input range, and programmable UVLO thresholds. | Choose for automotive safety-critical designs; not drop-in due to external feedback and higher BOM count. |
Compared with MP24971DN-LF-Z, MP2494DN-LF-Z trades input voltage headroom and line-drop capability for higher frequency and smaller footprint, while LM5164QDDARQ1 adds automotive qualification and flexibility at the cost of design complexity and external components.
Availability
MP24971DN-LF-Z is available at Aetrix Electronics and suitable for USB power supplies, automotive power adapters, and industrial 5V auxiliary rails requiring stable component supply across production lifecycles.
Supply support for MP24971DN-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, headquartered in Kirkland, WA, with global design and support operations.
The MP24971 belongs to MPS's industrial-grade buck converter product line, designed specifically for robust 5V power delivery in automotive, transportation, and harsh-environment applications with wide input ranges and integrated protection.
FAQ
What is the purpose of the VOC pin on MP24971DN-LF-Z?
The VOC (Output Line-Drop Compensator) pin enables active compensation for voltage drop across PCB traces or cables. By connecting a resistor from VOC to GND, the device adjusts its feedback reference proportionally to load current-measured differentially across ISP/ISN-ensuring constant 5V at the load point even with up to 300mV IR loss.
Can MP24971DN-LF-Z operate with ceramic output capacitors only?
Yes. The MP24971DN-LF-Z is internally compensated to remain stable with low-ESR ceramic capacitors such as X5R/X7R types. Typical designs use 22µF + 100µF ceramics in parallel, eliminating electrolytic bulk capacitors and improving lifetime reliability without requiring external compensation networks.
How does the hiccup-mode current limit function during a short circuit?
When VISP–VISN exceeds 100mV, the device immediately disables the high-side MOSFET and enters hiccup mode: it waits until VOS drops below 1.9V and the error amplifier output rises above 3V, then restarts with full 4ms soft-start. This limits average short-circuit current to ~100mA and prevents thermal runaway.
Is an external bootstrap diode required for MP24971DN-LF-Z?
An external bootstrap diode (e.g., BAT54) is recommended when duty cycle exceeds 65%-such as at low input voltages near 8V-or when efficiency optimization is critical. It supplements the internal bootstrap regulator, ensuring reliable gate drive voltage across the full input range and load conditions.
What is the maximum allowable power dissipation for MP24971DN-LF-Z in SOIC8E package?
At TA = 25°C, the SOIC8E package supports 2.5W continuous power dissipation (θJA = 50°C/W). At 125°C maximum junction temperature, this allows ~2W dissipation at 75°C ambient. Layout with full thermal pad soldering and ≥2 in² 2-oz copper is required to achieve rated performance.
Does MP24971DN-LF-Z support adjustable output voltage?
No. MP24971DN-LF-Z has a fixed 5V output generated by an internal 800mV reference and precision error amplifier. It does not support external feedback resistors or VOUT adjustment. For adjustable outputs, consider MPS's MP2494 or MPQ4312 families.
What is the minimum recommended input capacitance for MP24971DN-LF-Z?
A minimum 4.7µF X5R/X7R ceramic capacitor is recommended at the VIN pin, placed as close as possible to pins 1 (VIN) and 2 (GND). For high-current or noisy environments, a 100µF low-ESR aluminum polymer or tantalum capacitor may be added in parallel to suppress low-frequency ripple and surge currents.
MP24971DN-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:
- Fixed
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 8V
- Voltage - Input (Max):
- 50V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Current - Output:
- 1.5A
- Frequency - Switching:
- 100kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SOICE
MP24971DN-LF-Z FAQ
1.How can I place an order for MP24971DN-LF-Z through Aetrix?
Please submit a Request for Quotation (RFQ) for MP24971DN-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 MP24971DN-LF-Z reliable?
The price and inventory of MP24971DN-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 MP24971DN-LF-Z is usually 5 days.
3.What payment methods are accepted for MP24971DN-LF-Z?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP24971DN-LF-Z transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP24971DN-LF-Z?
MP24971DN-LF-Z orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP24971DN-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 MP24971DN-LF-Z?
For technical support, including MP24971DN-LF-Z datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP24971DN-LF-Z requirements.
6.How does Aetrix verify that MP24971DN-LF-Z is sourced from the original manufacturer or authorized distributors?
All MP24971DN-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 MP24971DN-LF-Z meets industry standards.
7.What is the process for return or replacement of MP24971DN-LF-Z?
All MP24971DN-LF-Z units undergo pre-shipment inspection (PSI). If there is an issue with MP24971DN-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 MP24971DN-LF-Z part is unused and in its original packaging.
Return procedure for MP24971DN-LF-Z:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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