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Texas Instruments LM2831XMF/NOPB
- Part No.:
- LM2831XMF/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2831XMF/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:2,661
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Product details
Overview
LM2831XMF/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 1.5-A output current with 0.6-V internal reference voltage, 1.6-MHz fixed switching frequency, and 130-mΩ PMOS switch on-resistance. It operates from 3 V to 5.5 V input and regulates output voltages from 0.6 V to 4.5 V, commonly used in USB-powered devices requiring compact, efficient local power conversion.
For engineers reviewing the LM2831XMF/NOPB datasheet, LM2831XMF/NOPB pinout, LM2831XMF/NOPB application, or LM2831XMF/NOPB equivalent, key selection considerations include its 1.6-MHz switching frequency enabling ultra-small external magnetics, internal soft-start limiting inrush current, current-mode control for fast transient response, and thermal shutdown at 165°C for robust operation in space-constrained embedded systems.
Technical Context
The LM2831XMF/NOPB implements constant-frequency current-mode PWM control with an internal 0.6-V reference and integrated 130-mΩ PMOS power switch. Its 1.6-MHz oscillator enables sub-3-mm inductor selection and supports output voltages as low as 0.6 V via external resistor divider on the FB pin.
It features cycle-by-cycle current limiting (2.5-A typical), undervoltage lockout with 2.73-V enable threshold and 430-mV hysteresis, and output overvoltage protection triggered at 15% above VREF. Internal compensation eliminates need for external loop components, simplifying design for 1.5-A load applications across –40°C to 125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.6 MHz - enables use of ≤3.3-µH inductors and ceramic capacitors for minimal PCB footprint |
| Output Current | 1.5 A - continuous regulated load capability with internal 130-mΩ PMOS switch |
| Input Voltage Range | 3 V to 5.5 V - compatible with single-cell Li-ion, USB 5-V, and 3.3-V/5-V system rails |
| Feedback Reference | 0.6 V ±2% - sets precise output voltage via external resistor divider; supports 0.6–4.5 V range |
| Quiescent Current | 3.3 mA (typ) in active mode - balances efficiency and light-load regulation performance |
| Shutdown Current | 30 nA - preserves battery life in standby or host-controlled power-down states |
| Thermal Shutdown | 165°C - protects device during overload or poor thermal layout; resumes at ~150°C |
Pinout & Package
LM2831XMF/NOPB uses the 5-pin SOT-23 (DBV) package with 1.60 mm × 2.90 mm body size and exposed pad not connected internally. Pin functions are validated per TI SNVS422D datasheet Rev D.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Power input | Primary supply connection (3–5.5 V); decoupled with ≥22-µF ceramic capacitor near pin |
| SW | Switch node | Drives external inductor and catch diode; requires low-inductance routing to minimize EMI |
| EN | Enable control | Logic-high (>1.8 V) enables regulation; floating or >VIN+0.3 V risks damage |
| FB | Feedback input | Senses output voltage via resistor divider; 0.6-V reference sets VOUT = 0.6×(1+R1/R2) |
| GND | Signal/power ground | Main return path; feedback bottom resistor must connect directly to this pin for accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft-start | Ramps reference from 0 V to 0.6 V over ~600 µs, limiting inrush current during startup |
| Current-mode PWM control | Provides inherent cycle-by-cycle current limiting and stable loop response without external compensation |
| 130-mΩ PMOS switch | Enables high efficiency (up to 94%) at 1.5-A load with minimal conduction loss |
| Overvoltage protection | Shuts down SW when FB exceeds 0.69 V (15% above VREF), preventing downstream component stress |
| Undervoltage lockout | Prevents operation below 2.73 V (typ), with 430-mV hysteresis to avoid oscillation during brownout |
Applications
| Local 5 V to Vcore Step-Down Converters | Core Power in HDDs |
|---|---|
Use Scenario: Converting 5-V USB or system rail to 1.2-V or 1.8-V CPU core voltage in portable SSD enclosures or embedded controllers. IC Role / Device Role / Timing Role: Primary buck regulator providing tightly regulated, low-noise core supply with fast transient response to dynamic CPU load changes. Use Value: 1.6-MHz switching and internal compensation reduce BOM count and board area while maintaining <±1% output regulation under 1.5-A load steps. |
Use Scenario: Supplying 3.3-V logic and 1.2-V servo control rails in 2.5-inch HDD electronics with strict thermal and size constraints. IC Role / Device Role / Timing Role: High-density point-of-load regulator replacing discrete FET+controller solutions to meet mechanical envelope limits. Use Value: SOT-23 package and 94% peak efficiency minimize heat generation and eliminate need for heatsinking in sealed drive assemblies. |
| USB Powered Devices | DSL Modems |
Use Scenario: Powering FPGA I/O banks or microcontroller peripherals directly from 5-V USB Type-A ports in field-deployable test tools. IC Role / Device Role / Timing Role: Compact, self-contained DC-DC converter enabling plug-and-play operation without external LDOs or charge pumps. Use Value: 30-nA shutdown current extends battery backup runtime; EN pin allows host MCU to gate power during sleep modes. |
Use Scenario: Generating 3.3-V analog front-end and 1.2-V DSP core supplies in residential DSL modems operating continuously for years. IC Role / Device Role / Timing Role: Reliable, long-lifetime buck regulator supporting 24/7 operation with built-in thermal shutdown and overvoltage protection. Use Value: 125°C max junction temperature rating and 165°C thermal shutdown ensure safe operation under sustained full-load conditions in enclosed plastic housings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS62231DRVR | 1.6-MHz synchronous buck; 0.6-V reference; 1.5-A rating; 2.05-V to 6.5-V input range | Wider input range supports 3.3-V system rails; synchronous rectification improves light-load efficiency | Preferred where input may dip below 3 V or where >95% efficiency at 10-mA load is required |
| MP1472GJ-Z | 1.6-MHz asynchronous buck; 0.8-V reference; 2-A rating; 4.5–16-V input range; external diode required | Higher input voltage tolerance suits 12-V PoE-powered DSL modems; higher current headroom for future upgrades | Selected when system input exceeds 5.5 V or when 2-A margin is needed for peak transient loads |
Compared with LM2831XMF/NOPB, TPS62231DRVR offers better light-load efficiency via synchronous operation but requires tighter layout for noise-sensitive analog circuits, while MP1472GJ-Z supports higher input voltages at the cost of added external diode and reduced minimum output voltage (0.8 V vs. 0.6 V).
Availability
LM2831XMF/NOPB is available at Aetrix Electronics and suitable for USB-powered devices, HDD core power, DSL modem subsystems, and other applications requiring stable component supply with industrial temperature support and long-term manufacturability.
Supply support for LM2831XMF/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 for industrial, automotive, and consumer markets.
The LM2831XMF/NOPB belongs to TI's high-frequency buck regulator product line, designed specifically for space-constrained, battery-aware applications needing rapid transient response and minimal external components.
FAQ
What is the maximum output current supported by the LM2831XMF/NOPB?
The LM2831XMF/NOPB delivers up to 1.5 A of continuous output current under recommended operating conditions (TJ ≤ 125°C, VIN = 3–5.5 V). Its internal 130-mΩ PMOS switch and thermal shutdown at 165°C ensure reliable operation at full load, with typical current limit set to 2.5 A for short-circuit protection. Derating is required above 85°C ambient depending on PCB copper area and airflow.
Does the LM2831XMF/NOPB require external compensation components?
No, the LM2831XMF/NOPB uses internal compensation optimized for current-mode control, eliminating the need for external compensation networks. This simplifies design and reduces BOM count. Stability is maintained across the full 0.6–4.5 V output range and 3–5.5 V input range when using recommended ceramic input/output capacitors and inductor values per TI SNVS422D Section 8.2.1.
What is the purpose of the EN pin on the LM2831XMF/NOPB?
The EN pin on the LM2831XMF/NOPB provides logic-level enable control: applying >1.8 V (typ) enables regulation, while <0.4 V (typ) places the device in ultra-low-power shutdown (30 nA). It must never be left floating or driven above VIN + 0.3 V to prevent latch-up or damage. This pin enables host MCU-controlled power sequencing in USB-powered or battery-operated systems using LM2831XMF/NOPB.
Can the LM2831XMF/NOPB regulate output voltages below 0.6 V?
No, the LM2831XMF/NOPB cannot regulate below 0.6 V because its internal reference voltage is fixed at 0.6 V ±2%. The output voltage is calculated as VOUT = 0.6 V × (1 + R1/R2), so the lowest achievable output is 0.6 V (when R1 = 0 Ω). For sub-0.6-V applications, a different regulator with adjustable reference or external reference injection would be required - LM2831XMF/NOPB is not suitable.
How does the LM2831XMF/NOPB handle thermal overload conditions?
The LM2831XMF/NOPB incorporates thermal shutdown that disables the internal PMOS switch when junction temperature exceeds 165°C (typ), preventing permanent damage. Operation resumes automatically once the junction cools to approximately 150°C. This behavior is confirmed in TI SNVS422D Section 7.3.6 and Electrical Characteristics Table 6.5, ensuring safe recovery without manual reset in thermally constrained layouts using LM2831XMF/NOPB.
LM2831XMF/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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:
- 1.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM2831XMF/NOPB FAQ
1.How can I place an order for LM2831XMF/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2831XMF/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 LM2831XMF/NOPB reliable?
The price and inventory of LM2831XMF/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2831XMF/NOPB is usually 5 days.
3.What payment methods are accepted for LM2831XMF/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2831XMF/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2831XMF/NOPB?
LM2831XMF/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2831XMF/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 LM2831XMF/NOPB?
For technical support, including LM2831XMF/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2831XMF/NOPB requirements.
6.How does Aetrix verify that LM2831XMF/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2831XMF/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 LM2831XMF/NOPB meets industry standards.
7.What is the process for return or replacement of LM2831XMF/NOPB?
All LM2831XMF/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2831XMF/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 LM2831XMF/NOPB part is unused and in its original packaging.
Return procedure for LM2831XMF/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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