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Monolithic Power Systems Inc. MP24971DN-LF
- Part No.:
- MP24971DN-LF
- Manufacturer:
- Monolithic Power Systems Inc.
- Package:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Datasheet:
-
MP24971DN-LF.pdf
- Description:
- IC REG BUCK 5V 1.5A 8SOICE
- Quantity:
- Payment:
- Shipping:
Inventory:3,426
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Product details
Overview
MP24971DN-LF 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 across an 8V–50V input range, features a 0.4Ω internal MOSFET, fixed 100kHz switching frequency, and integrated hiccup-mode overcurrent protection. It is designed for USB power supplies and automotive adapters requiring stable 5V regulation under varying trace impedance.
For engineers reviewing the MP24971DN-LF datasheet, MP24971DN-LF pinout, MP24971DN-LF application, or MP24971DN-LF equivalent, key selection criteria include its 5V fixed output accuracy (±3%), 100mV current sense threshold, 5.69–6.2V over-voltage protection window, SOIC8E thermal performance (θJA = 50°C/W), and line-drop compensation via VOC pin resistor programming.
Technical Context
The MP24971DN-LF implements current-mode control with a 100kHz oscillator and internal ramp compensation to stabilize loop response. Its error amplifier compares VOS-sensed output voltage against an 800mV reference, generating PWM duty cycle proportional to peak inductor current.
It integrates dual current sensing (ISP/ISN) for precise 100mV threshold-based hiccup-mode current limiting and short-circuit protection, plus output over-voltage detection triggered at ≥6V on ISN. Line-drop compensation is implemented by injecting load-current-proportional voltage into the feedback node via VOC and RTOP/RBOT resistive network.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5V fixed, ±3% tolerance (4.85–5.15V) ensures stable USB-compliant rail without external feedback resistors. |
| Max Continuous Output Current | 1.5A - supports high-current USB peripherals and linear charger inputs without external current boosting. |
| Input Voltage Range | 8V to 50V - enables direct operation from automotive battery (12V/24V/48V systems) and industrial unregulated supplies. |
| Switching Frequency | 100kHz fixed - simplifies EMI filtering design and avoids AM radio band; supports cost-effective magnetics. |
| Internal MOSFET RDS(ON) | 0.4Ω - reduces conduction loss at 1.5A, enabling >85% efficiency at 12V→5V conversion. |
| Current Sense Threshold | 100mV (VISP–VISN) - sets nominal current limit at 1.5A with 66mΩ sense resistor; programmable down to ~0.5A via external bias. |
| Output Over-Voltage Protection | 6.0V typical (5.69–6.2V range) - latches off SW if VISN exceeds threshold, protecting downstream 5V loads from open-sense faults. |
| Thermal Shutdown | 150°C junction temperature - protects die during overload or poor PCB heatsinking; recovers after cooldown and soft-start reset. |
Pinout & Package
MP24971DN-LF is housed in an SOIC8E package with exposed thermal pad (JEDEC MS-012 BA), offering 2.5W continuous power dissipation at TA = 25°C and θJA = 50°C/W - optimized for compact automotive and industrial PCBs requiring enhanced thermal performance over standard SOIC8.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VIN | Unregulated Input Supply | Accepts 8–50V; connects to input capacitor bank; powers internal regulator and MOSFET driver. |
| 2 GND | Ground Reference & Thermal Pad | Primary ground return; exposed pad must be soldered to large copper pour for thermal management and noise isolation. |
| 3 VOS | Output Voltage Sense | Direct connection to regulated 5V output; provides feedback to error amplifier for tight line/load regulation. |
| 4 VOC | Line-Drop Compensation Input | Connects to GND via RC resistor to program load-line gain (200–700mV per 50–100mV sense delta) for remote-load voltage stability. |
| 5 ISN | Negative Current Sense Input | Low-side sense node; used with ISP to detect output current; triggers OVP if pulled >6V (open-sense fault). |
| 6 ISP | Positive Current Sense Input | High-side sense node; forms differential pair with ISN; enables accurate current limiting and hiccup recovery timing. |
| 7 BST | Bootstrap Supply | Drives high-side MOSFET gate above VIN via external 10nF capacitor; requires low-ESR ceramic and optional external diode for >65% duty cycle. |
| 8 SW | Power Switch Node | Drain of internal MOSFET; connects to inductor and catch diode; high dv/dt node requiring short, shielded routing. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Output Line-Drop Compensation | Adjustable gain (200–700mV per 100mV sense delta) via VOC resistor enables ±1% load-side voltage regulation across 100mΩ trace resistance. |
| Hiccup-Mode Current Limit | Auto-restarts after fault clearance with 2–4ms soft-start; limits average short-circuit current to <500mA using RS1/RS2 bias resistors. |
| Stable with Ceramic Output Capacitors | Supports low-ESR X5R/X7R ceramics (≥22µF) without external compensation - reduces BOM count and board area vs. electrolytic solutions. |
| Integrated 5V LDO Bias Rail | Internal regulator powers control circuitry from VIN; draws only 1.2–1.5mA quiescent current - suitable for always-on automotive modules. |
| Low-EMI Switching Edges | Controlled tRISE (50–100ns) and tFALL (85–150ns) minimize broadband radiation; meets EN55022 Class B with minimal filtering. |
| Robust Fault Protection Suite | Combines hiccup current limit, output OVP (6V), thermal shutdown (150°C), and UVLO (3.5V typ.) - eliminates need for external supervisors. |
Applications
| USB Power Delivery Adapter | Automotive Rear-Seat Charging Port |
|---|---|
|
Use Scenario: 12V vehicle battery powers dual 5V USB-A ports delivering up to 1.5A each under transient load steps. IC Role / Device Role / Timing Role: Primary buck regulator providing isolated, regulated 5V output with line-drop compensation for long harness runs. Use Value: Maintains ±1% load-side voltage despite 150mΩ wiring resistance; hiccup mode prevents thermal runaway during connector short events. |
Use Scenario: Integrated infotainment head unit supplies 5V to rear-seat USB hubs and wireless charging receivers. IC Role / Device Role / Timing Role: Fixed-output DC/DC converter operating from 9–16V battery with cold-crank immunity down to 8V. Use Value: 50°C/W θJA and exposed pad enable operation at 85°C ambient without derating; 100kHz switching avoids interference with AM/FM receivers. |
| Industrial Linear Charger Power Stage | Point-of-Sale Peripheral Power Module |
|
Use Scenario: 24V factory bus powers multi-cell Li-ion linear chargers requiring clean, stable 5V bias rails. IC Role / Device Role / Timing Role: Pre-regulator stepping 24V down to 5V before LDO stage; handles variable charge current load transients. Use Value: 1.5A continuous rating supports parallel-charger configurations; low 100mV current sense enables accurate charge current monitoring. |
Use Scenario: Compact kiosk base station delivers 5V to barcode scanners, receipt printers, and magnetic stripe readers. IC Role / Device Role / Timing Role: Centralized power IC converting 48V PoE-derived supply to 5V with minimal external components. Use Value: SOIC8E package fits 12mm × 12mm footprint; fixed 5V output eliminates feedback resistor placement errors in high-volume assembly. |
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 |
|---|---|---|---|
| LM5164QDRCRQ1 | 42V max input, 1A output, adjustable output (requires feedback resistors), 2.2MHz switching. | Higher frequency enables smaller magnetics but increases EMI filtering complexity; lacks line-drop compensation. | Select when board space is constrained and 1A output suffices; avoid where trace-length-induced voltage drop must be actively compensated. |
| TPS54340DDAR | 42V max input, 3.5A output, adjustable output, 100kHz–2.5MHz programmable frequency, no integrated line-drop compensation. | Higher current capability but requires external current-sense amplifier and compensation network for precision current limiting. | Choose for higher output current needs (>1.5A); not recommended when VOC-driven remote-sensing and simplified layout are critical. |
Compared with LM5164QDRCRQ1 and TPS54340DDAR, MP24971DN-LF uniquely integrates 5V fixed output, line-drop compensation, and hiccup-mode current limiting in SOIC8E - reducing component count and layout sensitivity for automotive and USB adapter designs where 1.5A and 50V input are required.
Availability
MP24971DN-LF is available at Aetrix Electronics and suitable for USB power supplies, automotive power adapters, and industrial linear charger power stages requiring stable component supply, RoHS-compliant packaging, and long-term production continuity.
Supply support for MP24971DN-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 mixed-signal ICs for power management, motion control, and interface applications.
The MP24971 belongs to MPS's industrial-grade buck converter product line, engineered for robust operation in automotive, transportation, and harsh-environment power systems with wide-input-range and fault-resilient regulation.
FAQ
What is the purpose of the VOC pin on MP24971DN-LF?
The VOC (Output Line-Drop Compensator) pin accepts a resistor-to-ground to program gain for compensating voltage drop across PCB traces or cables. When load current flows through trace resistance, VOC injects a proportional correction voltage into the feedback network via RTOP, maintaining constant 5V at the load point - verified across 0–1.5A with ≤1% deviation.
Can MP24971DN-LF operate with input voltage below 8V?
No - the absolute minimum operating input voltage is 8V, enforced by an under-voltage lockout (UVLO) with 3.5V typical rising threshold and 200mV hysteresis. Operation below 8V is prohibited; attempting startup at 7.5V will hold the device in shutdown until VIN exceeds 8V.
How does the hiccup-mode current limit recover after triggering?
After overcurrent detection, MP24971DN-LF disables SW and enters hiccup mode: it waits until VOS drops below 1.9V and VCOMP rises above 3V, then initiates a full 2–4ms internal soft-start sequence before re-enabling switching - preventing thermal accumulation during sustained faults.
Is an external bootstrap diode required for MP24971DN-LF?
An external bootstrap diode (e.g., BAT54) is recommended when duty cycle exceeds 65% - such as in 48V→5V conversion - to ensure reliable BST capacitor recharge. At 12V→5V (42% duty cycle), the internal regulator suffices; the diode improves efficiency and gate drive margin under high-input conditions.
What is the maximum allowable RSENSE value for 1.5A current limiting?
With a 100mV current sense threshold, RSENSE = 100mV / 1.5A = 66.7mΩ. The datasheet uses 66mΩ (R5 in Figure 6), confirming this value achieves nominal 1.5A limit. Higher values reduce current limit proportionally; lower values increase limit but reduce measurement SNR and thermal margin.
Does MP24971DN-LF support synchronization to an external clock?
No - MP24971DN-LF has a fixed 100kHz internal oscillator with no SYNC pin or frequency adjustment capability. It cannot be synchronized to external clocks or daisy-chained for phase interleaving; alternative parts like MPQ4331-AEC1 offer sync functionality.
What is the recommended minimum output capacitance for stability?
The datasheet specifies ≥22µF ceramic output capacitance (C8 in Figure 6) for stable operation. Using less than 22µF risks loop instability and excessive output ripple; X5R/X7R dielectrics are mandatory - aluminum or tantalum capacitors are not supported due to ESR and ESL limitations.
MP24971DN-LF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Monolithic Power Systems Inc.
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width) Exposed Pad
- Packaging:
- Tube
- 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 FAQ
1.How can I place an order for MP24971DN-LF through Aetrix?
Please submit a Request for Quotation (RFQ) for MP24971DN-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 MP24971DN-LF reliable?
The price and inventory of MP24971DN-LF 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 is usually 5 days.
3.What payment methods are accepted for MP24971DN-LF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MP24971DN-LF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MP24971DN-LF?
MP24971DN-LF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MP24971DN-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 MP24971DN-LF?
For technical support, including MP24971DN-LF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MP24971DN-LF requirements.
6.How does Aetrix verify that MP24971DN-LF is sourced from the original manufacturer or authorized distributors?
All MP24971DN-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 MP24971DN-LF meets industry standards.
7.What is the process for return or replacement of MP24971DN-LF?
All MP24971DN-LF units undergo pre-shipment inspection (PSI). If there is an issue with MP24971DN-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 MP24971DN-LF part is unused and in its original packaging.
Return procedure for MP24971DN-LF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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