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Texas Instruments LM2831ZMFX/NOPB
- Part No.:
- LM2831ZMFX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2831ZMFX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,759
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Product details
Overview
LM2831ZMFX/NOPB from Texas Instruments is a monolithic, high-frequency PWM step-down DC-DC regulator in a 5-pin SOT-23 package, delivering up to 1.5A output current with an internal 130 mΩ PMOS switch. It operates from 3.0V to 5.5V input, regulates output down to 0.6V with ±2% reference accuracy, and switches at a fixed 3.0 MHz frequency-enabling compact designs for USB-powered devices and set-top boxes.
For engineers reviewing the LM2831ZMFX/NOPB datasheet, LM2831ZMFX/NOPB pinout, LM2831ZMFX/NOPB application, or LM2831ZMFX/NOPB equivalent, key selection criteria include its 3.0 MHz switching frequency, 130 mΩ internal PMOS RDS(ON), 0.6 V ±2% feedback reference, thermal shutdown at 165°C, and ultra-low 30 nA shutdown current-critical for space-constrained, high-efficiency point-of-load regulation.
Technical Context
The LM2831ZMFX/NOPB uses current-mode PWM control with internal compensation and fixed 3.0 MHz oscillator, supporting minimum on-times as low as 30 ns to maintain regulation across its full 3.0–5.5 V input range. Its architecture integrates soft-start (600 µs ramp), cycle-by-cycle current limiting (typ. 2.5 A), and output overvoltage protection triggered at FB = 1.15 × VFB.
It features undervoltage lockout with 2.73 V (rising) / 2.3 V (falling) thresholds and 430 mV hysteresis, plus dedicated EN pin logic-level enable with 1.8 V threshold and 30 nA standby current. The SOT-23-5 package places GND, FB, SW, VIN, and EN on standard pinout positions optimized for minimal loop area and thermal performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 3.0 MHz - enables use of sub-2 µH inductors and small ceramic capacitors, reducing solution footprint by >40% vs. 550 kHz variants. |
| Output Current | 1.5 A continuous - supports core power for HDDs and USB peripherals without external boost circuitry. |
| Input Voltage Range | 3.0 V to 5.5 V - compatible with single-cell Li-ion, USB 5 V, and regulated 3.3 V rails. |
| Feedback Reference | 0.600 V ±2% - sets output voltage via resistor divider; enables 0.6 V minimum output for modern low-voltage processors. |
| Internal Switch RDS(ON) | 130 mΩ (SOT-23-5) - limits conduction loss to ≤120 mW at 1.5 A, supporting ≥90% efficiency at mid-load. |
| Quiescent Current | 4.3–6.5 mA (active), 30 nA (shutdown) - ensures battery runtime extension in always-on USB devices. |
| Thermal Shutdown | 165°C with 15°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
Pinout & Package
LM2831ZMFX/NOPB is housed in a RoHS-compliant 5-pin SOT-23 package (NSC drawing MF05A, top mark SLAB), with exposed pad omitted-thermal path relies on PCB copper area under the package body.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch node | Connects directly to inductor and catch diode cathode; carries high di/dt; requires shortest possible trace to minimize EMI and voltage spikes. |
| 2 - GND | Signal and power ground | Reference for FB and EN; must tie bottom resistor of feedback divider here; serves as primary return for switch current and IC bias. |
| 3 - FB | Feedback input | High-impedance (≤100 nA bias) node sensing output voltage divider; sensitive to noise-requires short, shielded trace away from SW/VIN. |
| 4 - EN | Enable control | Logic-compatible input (threshold 1.8 V); float = disable; max voltage = VIN + 0.3 V; drives 100 nA leakage in shutdown mode. |
| 5 - VIN | Power input | Supplies both control circuitry and PMOS switch; requires local 22 µF ceramic capacitor with low ESL placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| 3.0 MHz fixed-frequency operation | Enables 1.6 µH inductor and <100 µF total output capacitance-reducing board area by ~65% vs. 550 kHz alternatives. |
| Internal 130 mΩ PMOS switch | Eliminates external MOSFET and driver; reduces BOM count and layout complexity while maintaining 93% peak efficiency. |
| 0.6 V ±2% internal reference | Supports precise low-VOUT regulation (e.g., 1.2 V, 1.8 V, 3.3 V) with standard 1% resistors-no trimming required. |
| 600 µs internal soft-start | Controls output ramp rate to limit inrush current into downstream capacitance-prevents input rail droop and system reset. |
| Pulse-by-pulse current limit | Protects switch during short-circuit or startup overload; typical trip at 2.5 A ensures safe 1.5 A continuous operation with margin. |
Applications
| Local 5V to Vcore Step-Down Converters | Core Power in HDDs |
|---|---|
Use Scenario: Converting 5 V USB or SATA supply to 1.2 V CPU core voltage in portable storage enclosures. IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated, low-noise Vcore with fast transient response to processor load steps. Use Value: 3.0 MHz switching minimizes output ripple and eliminates need for large bulk capacitors-critical for shock-resistant HDD mechanical design. | Use Scenario: Powering spindle motor controller and read/write channel ICs in 2.5″ laptop HDDs. IC Role / Device Role / Timing Role: Point-of-load regulator delivering stable 3.3 V or 1.8 V from main 5 V rail, synchronized to drive timing requirements. Use Value: 1.5 A capability and thermal shutdown ensure reliable operation during burst write cycles without derating or heatsinking. |
| Set-Top Boxes | USB Powered Devices |
Use Scenario: Generating 1.2 V, 1.8 V, and 3.3 V rails for SoC, memory, and interface ICs in cable/satellite receivers. IC Role / Device Role / Timing Role: Secondary DC-DC converter stepping down 5 V USB or wall-adapter input to multiple low-voltage domains. Use Value: Small SOT-23-5 footprint and high efficiency (>90% at 1 A) reduce thermal stress in sealed plastic enclosures with no airflow. | Use Scenario: Regulating 5 V USB power to 3.3 V for microcontrollers, sensors, and USB PHYs in portable accessories. IC Role / Device Role / Timing Role: Standalone buck converter enabling direct USB bus powering without external LDO or charge pump. Use Value: 30 nA shutdown current extends battery backup life; EN pin allows host-controlled power gating for USB suspend/resume compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62130ARGTR | 3.0 MHz sync buck, 0.6 V ref, but uses integrated N-MOSFET pair (RDS(ON) = 120 mΩ/140 mΩ), higher IQ (17 µA shutdown). | Requires no external catch diode; better light-load efficiency due to DCS-Control™, but larger 16-pin QFN package. | Select when board space allows QFN and diode elimination is prioritized over SOT-23 compatibility. |
| MP2108DQ-LF-Z | Fixed 3.0 MHz, 1.5 A, 0.6 V ref, but SOT-563 package (6-pin), higher RDS(ON) (200 mΩ), no OVP or soft-start. | Lacks overvoltage protection and internal soft-start-requires external RC network for controlled start-up. | Select only if cost sensitivity outweighs protection feature requirements and layout accommodates SOT-563. |
Compared with TPS62130ARGTR and MP2108DQ-LF-Z, LM2831ZMFX/NOPB offers the smallest PCB footprint (SOT-23-5), integrated catch diode support, and comprehensive protection (OVP, thermal, UVLO), making it optimal for ultra-compact USB and consumer electronics where reliability and size are co-primary constraints.
Availability
LM2831ZMFX/NOPB is available at Aetrix Electronics and suitable for USB-powered devices, set-top boxes, and HDD core power applications requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for LM2831ZMFX/NOPB 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
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management ICs since the 1980s.
The LM2831 product line was designed specifically for high-density, high-efficiency point-of-load DC-DC conversion in space-constrained consumer and computing applications-emphasizing integration, thermal robustness, and ease of use.
FAQ
What is the switching frequency of the LM2831ZMFX/NOPB?
The LM2831ZMFX/NOPB has a fixed internal switching frequency of 3.0 MHz, confirmed in the Electrical Characteristics table (FSW = 2.25–3.75 MHz, typ. 3.0 MHz). This frequency is factory-set and not adjustable-enabling consistent EMI behavior and predictable inductor sizing across all units of LM2831ZMFX/NOPB.
Does the LM2831ZMFX/NOPB require an external catch diode?
Yes, the LM2831ZMFX/NOPB requires an external Schottky catch diode connected between SW and GND. Unlike synchronous buck regulators, it uses an internal PMOS high-side switch and relies on an external diode for freewheeling current during the off-time-confirmed in the Applications Information section and Typical Application Circuits.
What is the maximum output current rating for the LM2831ZMFX/NOPB?
The LM2831ZMFX/NOPB is rated for 1.5 A continuous output current under recommended operating conditions (TJ ≤ 125°C, proper PCB thermal design). The datasheet specifies a typical current limit of 2.5 A with minimum guaranteed limit of 1.8 A-providing margin for transient loads while sustaining 1.5 A steady-state operation.
Can the LM2831ZMFX/NOPB operate from a 3.3 V input?
Yes, the LM2831ZMFX/NOPB supports input voltages from 3.0 V to 5.5 V, explicitly stated in the Operating Ratings table. At 3.3 V input, it can regulate outputs as low as 0.6 V (e.g., 1.2 V or 1.8 V) with duty cycle adjusted per VOUT/VIN ratio-verified in Load Regulation graphs and Design Example calculations.
What package type is used for the LM2831ZMFX/NOPB?
The LM2831ZMFX/NOPB uses the 5-pin SOT-23 package (NSC drawing MF05A), with top-side marking "SLAB". This is confirmed in the Ordering Information table and Connection Diagrams section-distinct from the LLP-6 variant (LM2831ZSD) and other frequency options in SOT-23.
LM2831ZMFX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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):
- 3V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 0.6V
- Voltage - Output (Max):
- 4.5V
- Current - Output:
- 1.5A
- Frequency - Switching:
- 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM2831ZMFX/NOPB FAQ
1.How can I place an order for LM2831ZMFX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2831ZMFX/NOPB 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 LM2831ZMFX/NOPB reliable?
The price and inventory of LM2831ZMFX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2831ZMFX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2831ZMFX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2831ZMFX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2831ZMFX/NOPB?
LM2831ZMFX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2831ZMFX/NOPB 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 LM2831ZMFX/NOPB?
For technical support, including LM2831ZMFX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2831ZMFX/NOPB requirements.
6.How does Aetrix verify that LM2831ZMFX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2831ZMFX/NOPB 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 LM2831ZMFX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2831ZMFX/NOPB?
All LM2831ZMFX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2831ZMFX/NOPB, 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 LM2831ZMFX/NOPB part is unused and in its original packaging.
Return procedure for LM2831ZMFX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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