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Texas Instruments LM2831YSDX/NOPB
- Part No.:
- LM2831YSDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2831YSDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,936
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Product details
Overview
LM2831YSDX/NOPB from Texas Instruments is a monolithic, current-mode PWM step-down DC-DC regulator IC in a 5-pin SOT-23 package, delivering up to 1.5-A output current with 0.55-MHz switching frequency, 0.6-V internal reference (±2%), and 130-mΩ integrated PMOS switch. It operates from 3 V to 5.5 V input and supports adjustable output voltages from 0.6 V to 4.5 V, commonly used in USB-powered devices and HDD core power supplies.
For engineers reviewing the LM2831YSDX/NOPB datasheet, LM2831YSDX/NOPB pinout, LM2831YSDX/NOPB application, or LM2831YSDX/NOPB equivalent, key selection criteria include confirmed 0.55-MHz fixed-frequency operation, thermal shutdown at 165°C, undervoltage lockout with 430-mV hysteresis, 30-nA shutdown quiescent current, and verified compatibility with ceramic output capacitors for compact, high-efficiency local regulation.
Technical Context
The LM2831YSDX/NOPB implements constant-frequency current-mode control with internal compensation, enabling stable regulation across wide load and line variations without external loop components. Its 30-ns minimum on-time supports low-duty-cycle operation down to 0.6-V output at 5.5-V input.
It integrates pulse-by-pulse current limiting (2.5-A typical), soft-start (600-µs ramp), overvoltage protection (15% above VREF), and enable-controlled ultra-low-power shutdown (30 nA). The SOT-23 package features thermally enhanced GND pin placement and requires no external bootstrap capacitor.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 0.55 MHz - enables use of small 2.2–4.7-µH inductors and 22-µF ceramic capacitors for minimal PCB footprint |
| Output Current | 1.5 A continuous - supports core rail requirements for HDDs, set-top boxes, and USB peripherals |
| Input Voltage Range | 3 V to 5.5 V - matches standard USB 5-V and Li-ion battery-derived rails |
| Feedback Reference | 0.6 V ±2% - sets precise output voltage via external resistor divider; enables 0.6-V minimum VOUT |
| PMOS RDS(ON) | 130 mΩ (TJ = 25°C) - limits conduction loss at full load; increases to 195 mΩ at 125°C |
| Quiescent Current | 2.8 mA (switching), 30 nA (shutdown) - ensures >96% efficiency at light loads and ultra-low standby drain |
| UVLO Threshold | 2.73 V (rising), 2.3 V (falling) with 430-mV hysteresis - prevents erratic startup during brownout conditions |
| Thermal Shutdown | 165°C activation, ~150°C recovery - protects against sustained overload or poor heatsinking in confined enclosures |
Pinout & Package
LM2831YSDX/NOPB uses the 5-pin SOT-23 (DBV) package (1.60 mm × 2.90 mm body), with exposed pad not present. Pin 1 is SW (switch node), Pin 2 is GND (power ground), Pin 3 is FB (feedback input), Pin 4 is EN (enable), and Pin 5 is VIN (input supply).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 - SW | Switch node output | Connects directly to inductor and catch diode anode; swings between VIN and –0.3 V; carries high di/dt |
| 2 - GND | Power ground reference | Primary return path for switch current and feedback network; must be placed adjacent to bottom resistor of FB divider |
| 3 - FB | Feedback input | Senses output voltage via resistor divider; bias current <100 nA; sensitive to noise-requires short trace to GND |
| 4 - EN | Enable control input | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) disables with 30-nA IQ; must not float or exceed VIN + 0.3 V |
| 5 - VIN | Input power supply | Supplies both control circuitry and PMOS gate drive; requires local 22-µF ceramic bypass capacitor close to pin |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft-start | 600-µs VOUT ramp - reduces inrush current into large output capacitors and prevents input rail sag |
| Current-mode PWM control | No external compensation required - provides inherent cycle-by-cycle current limiting and fast transient response |
| Overvoltage protection | Triggers at FB = 1.15 × VREF (≈0.69 V) - disables switch to prevent damage during feedback divider fault or load dump |
| Thermal shutdown with hysteresis | 165°C trip / ~150°C release - allows safe cooldown before automatic restart; avoids thermal cycling instability |
| Ultra-low shutdown current | 30 nA - enables battery-backed systems to retain >99% charge over months of standby |
Applications
| USB-Powered Devices | HDD Core Power |
|---|---|
Use Scenario: Portable USB hubs, external SSD enclosures, and bus-powered peripherals requiring regulated 3.3-V or 1.2-V rails from 5-V USB source. IC Role / Device Role / Timing Role: Primary step-down regulator converting 5-V USB input to stable low-voltage core supply for USB controllers and NAND flash. Use Value: 96% peak efficiency at 1.5-A load minimizes heat in sealed enclosures; 0.55-MHz switching allows compact 3.3-µH inductor and 2×22-µF ceramic output capacitance. |
Use Scenario: 2.5-inch and 3.5-inch hard disk drives needing tightly regulated 1.2-V or 1.8-V Vcore from 5-V or 12-V intermediate rail. IC Role / Device Role / Timing Role: Local point-of-load converter delivering fast-transient-responsive core voltage to HDD controller ASICs. Use Value: 30-ns minimum on-time supports 1.2-V output at 5-V input (D ≈ 24%); current-mode control maintains ±1% regulation during 1-A step transients. |
| Set-Top Boxes | DSL Modems |
Use Scenario: Consumer STBs with multiple SoC domains (CPU, GPU, memory) requiring independent, low-noise 1.1-V and 1.8-V supplies. IC Role / Device Role / Timing Role: Secondary buck regulator generating clean core voltage from main 3.3-V or 5-V system rail. Use Value: Internal 0.6-V reference and ±2% tolerance ensure accurate VOUT setting; soft-start prevents reset glitches during power-up sequencing. |
Use Scenario: Residential DSL modems and gateways needing efficient 3.3-V or 2.5-V supply for PHY and microcontroller from 5-V wall adapter. IC Role / Device Role / Timing Role: High-density DC-DC converter replacing linear regulators to reduce thermal load in fanless plastic housings. Use Value: 130-mΩ RDS(ON) and ceramic-capacitor compatibility achieve >90% efficiency at 1-A load, cutting board temperature rise by >15°C vs LDO. |
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 | Fixed 3-MHz switching, 0.6-V reference, 1.8-A rating, WSON-6 package; higher frequency but lower max IOUT derating at 85°C | Better suited for space-constrained designs needing faster transient response; less optimal for 0.55-MHz EMI filtering requirements | Select when board layout prioritizes smallest inductor size and output ripple is dominated by switching frequency, not load step. |
| MP2104DJ-LF-Z | 0.65-MHz nominal frequency, 1.5-A rating, SOT-23-6 package with separate BOOT pin; requires external bootstrap capacitor | Requires additional 0.1-µF ceramic boot cap and careful routing; lacks integrated OVP and soft-start timing control | Choose only if existing design already uses MP2104 footprint and external bootstrap is acceptable; avoid for new USB/STB designs. |
Compared with TPS62231DRVR and MP2104DJ-LF-Z, LM2831YSDX/NOPB offers guaranteed 0.55-MHz operation with no external timing components, integrated soft-start and OVP, and SOT-23-5 simplicity-making it optimal for cost-sensitive, EMI-controlled, and layout-constrained USB and consumer electronics applications.
Availability
LM2831YSDX/NOPB is available at Aetrix Electronics and suitable for USB-powered devices, HDD core power supplies, set-top boxes, and DSL modems requiring stable component supply with consistent parametric performance and long-term manufacturability.
Supply support for LM2831YSDX/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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in high-efficiency DC-DC conversion.
The LM2831YSDX/NOPB belongs to TI's high-frequency monolithic buck regulator product line, designed specifically for compact, low-noise, and thermally efficient point-of-load conversion in portable and consumer electronics.
FAQ
What is the confirmed switching frequency of LM2831YSDX/NOPB?
The LM2831YSDX/NOPB has a factory-trimmed, internally set switching frequency of 0.55 MHz (typical), with guaranteed range of 0.4 MHz to 0.7 MHz across –40°C to 125°C junction temperature. This value is fixed per device variant and does not require external resistors or capacitors for configuration.
Does LM2831YSDX/NOPB require an external bootstrap capacitor?
No, LM2831YSDX/NOPB does not require an external bootstrap capacitor. Its integrated PMOS high-side switch uses charge-pump-based gate drive powered directly from VIN, eliminating the need for a separate bootstrap network-unlike many N-channel MOSFET-based buck controllers.
What is the maximum output voltage supported by LM2831YSDX/NOPB?
The LM2831YSDX/NOPB supports output voltages up to 4.5 V, set via external resistor divider connected to the FB pin. This limit arises from absolute maximum ratings on the FB pin (3 V) and operational constraints of the internal error amplifier; outputs above 4.5 V require external feedback scaling.
Can LM2831YSDX/NOPB operate with ceramic output capacitors only?
Yes, LM2831YSDX/NOPB is fully compatible with ceramic-only output capacitance. Its internal compensation and current-mode architecture stabilize with low-ESR MLCCs (e.g., 2×22 µF X5R), eliminating need for tantalum or polymer capacitors while improving transient response and reliability.
What thermal performance can be expected from LM2831YSDX/NOPB in SOT-23 package?
In the SOT-23-5 (DBV) package, LM2831YSDX/NOPB has a junction-to-ambient thermal resistance (RθJA) of 163.4°C/W on a standard 2-layer board. At 1.5-A load and 5-V input, typical power dissipation is ~350 mW, resulting in ~57°C junction rise above ambient-well within the 125°C max operating limit.
LM2831YSDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- 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:
- 550kHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LM2831YSDX/NOPB FAQ
1.How can I place an order for LM2831YSDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2831YSDX/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 LM2831YSDX/NOPB reliable?
The price and inventory of LM2831YSDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2831YSDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2831YSDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2831YSDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2831YSDX/NOPB?
LM2831YSDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2831YSDX/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 LM2831YSDX/NOPB?
For technical support, including LM2831YSDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2831YSDX/NOPB requirements.
6.How does Aetrix verify that LM2831YSDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2831YSDX/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 LM2831YSDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2831YSDX/NOPB?
All LM2831YSDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2831YSDX/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 LM2831YSDX/NOPB part is unused and in its original packaging.
Return procedure for LM2831YSDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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