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Texas Instruments LM2831ZSDX
- Part No.:
- LM2831ZSDX
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2831ZSDX.pdf
- Description:
- IC REG BUCK ADJ 1.5A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:3,785
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Product details
Overview
LM2831ZSDX from Texas Instruments is a monolithic, high-frequency PWM step-down DC-DC regulator in a 6-pin LLP package, delivering up to 1.5A output current with an internal 150 mΩ PMOS switch. It operates from 3.0V to 5.5V input, regulates down to 0.6V output, and features fixed 3.0 MHz switching frequency for compact power conversion in space-constrained USB-powered devices and set-top boxes.
For engineers reviewing the LM2831ZSDX datasheet, LM2831ZSDX pinout, LM2831ZSDX application, or LM2831ZSDX equivalent, key selection considerations include its 3.0 MHz switching frequency enabling ultra-small inductors, 0.6V ±2% internal reference accuracy, thermal shutdown at 165°C, current-mode control with internal compensation, and 30 nA shutdown quiescent current - all critical for low-noise, high-density point-of-load designs.
Technical Context
The LM2831ZSDX uses current-mode PWM control with internal compensation, supporting stable regulation across load and line variations without external loop components. Its 3.0 MHz fixed switching frequency (±0.75 MHz tolerance) enables sub-2 µH inductor selection and reduces output ripple via high-frequency filtering.
It integrates a 150 mΩ PMOS switch (LLP-6 package), undervoltage lockout (2.73V rising threshold), cycle-by-cycle current limit (1.8A min / 2.5A typ), and soft-start with ~600 µs ramp time. Output overvoltage protection triggers at FB = 1.15 × VFB, and thermal shutdown activates at 165°C with 15°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 3.0 MHz (fixed); enables use of ≤1.6 µH inductors and chip-scale ceramic capacitors |
| Input Voltage Range | 3.0 V to 5.5 V; compatible with single-cell Li-ion, USB 5V, and 3.3V/5V system rails |
| Output Voltage Range | 0.6 V to 4.5 V; set via external resistor divider with 0.600 V ±2% internal reference |
| Max Output Current | 1.5 A continuous; supported by internal 150 mΩ PMOS switch in LLP-6 package |
| Quiescent Current | 4.3–6.5 mA (active), 30 nA (shutdown); enables battery-friendly standby in portable systems |
| Thermal Shutdown | 165°C activation with ~15°C hysteresis; protects against sustained overload or poor PCB thermal design |
| Feedback Voltage | 0.600 V ±2% (0.588–0.612 V); defines output accuracy and sets minimum achievable VOUT |
Pinout & Package
The LM2831ZSDX is housed in a thermally enhanced 6-pin LLP (Leadless Leadframe Package) with exposed die attach pad (DAP) for improved heat dissipation. The DAP must be soldered to PCB ground plane using ≥4 thermal vias for optimal θJA performance (80°C/W typical).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (FB) | Feedback input | High-impedance node sensing output voltage via resistor divider; layout sensitivity requires short trace and local GND |
| 2 (GND) | Signal and power ground | Reference for feedback network and internal circuitry; must be connected near bottom resistor of divider |
| 3 (SW) | Switch node | Drives external inductor and catch diode; high dv/dt node requiring tight layout and minimal parasitic inductance |
| 4 (VIND) | Main power input | Supplies PMOS switch; requires local 22 µF ceramic input capacitor with low ESL |
| 5 (VINA) | Control circuit supply | Bias rail for internal logic; must be tied directly to VIND on PCB to ensure proper enable threshold and UVLO behavior |
| 6 (EN) | Enable control | Logic-high active; threshold 1.8 V, max voltage VINA + 0.3 V; floating prohibited |
Key Features
| Feature | Design Value |
|---|---|
| 3.0 MHz fixed-frequency operation | Enables <1.6 µH inductors and eliminates audible noise; supports fast transient response in compact layouts |
| Internal 150 mΩ PMOS switch (LLP-6) | Reduces conduction loss at 1.5A load; improves efficiency vs. SOT23-5 variant (130 mΩ but lower thermal capability) |
| 0.6 V ±2% internal reference | Ensures accurate low-VOUT regulation (e.g., 1.2 V, 0.9 V) with minimal resistor tolerance impact |
| Current-mode PWM with internal compensation | Eliminates need for external compensation network; simplifies design while maintaining stability across 0.6–4.5 V outputs |
| Ultra-low 30 nA shutdown current | Extends battery life in always-on USB peripherals and sleep-mode consumer electronics |
Applications
| USB-Powered Devices | Set-Top Boxes |
|---|---|
Use Scenario: Powering FPGA I/O banks or USB controller logic from 5V USB bus in portable media adapters. IC Role / Device Role / Timing Role: Primary step-down regulator converting 5V USB input to 1.8V or 3.3V local rail with fast load transient response. Use Value: 3.0 MHz switching minimizes inductor size (<2 mm² footprint), enabling full functionality within slim USB form factors. |
Use Scenario: Generating core voltage for MPEG decoder SoC in cost-sensitive cable/satellite receivers. IC Role / Device Role / Timing Role: High-efficiency buck converter delivering 1.2V @ 1.5A with tight regulation under dynamic video processing loads. Use Value: Internal soft-start and OVP prevent brownouts during channel switching; 93% peak efficiency reduces heatsink requirements. |
| HDD Core Power | DSL Modems |
Use Scenario: Supplying 1.2V core voltage to 2.5" HDD controller ICs in NAS enclosures with limited airflow. IC Role / Device Role / Timing Role: Local DC/DC regulator with thermal shutdown protecting against enclosure overheating during sustained write operations. Use Value: 165°C thermal shutdown and 80°C/W θJA (with DAP grounding) allow reliable operation without forced cooling. |
Use Scenario: Providing stable 3.3V rail for ADSL2+ PHY and DSP in wall-powered broadband modems. IC Role / Device Role / Timing Role: Input-filter-tolerant buck converter operating from noisy 5V SMPS-derived input with <1% load regulation. Use Value: UVLO hysteresis (430 mV) prevents oscillation during brownout recovery; 0.588–0.612 V VFB ensures ±1.5% output accuracy. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2831YSDX | 550 kHz switching frequency; 130 mΩ switch (SOT23-5) or 150 mΩ (LLP-6); higher min duty cycle (2%) | Better efficiency at light loads; requires larger inductor (≥4.7 µH); less suitable for ultra-compact layouts | Select when board area allows larger magnetics and lower EMI is prioritized over size |
| TPS62231DRVR | 3.0 MHz, 1.5A, 0.6V ref, but uses synchronous rectification (no external diode); 25 µA IQ (active) | Higher efficiency (>95%) due to synchronous FET; requires different layout (no catch diode path) | Prefer when efficiency >93% and BOM count reduction are critical; verify compatibility with existing feedback network |
Compared with LM2831YSDX, LM2831ZSDX delivers smaller solution size and faster transient response but trades off slightly higher active quiescent current; versus TPS62231DRVR, it avoids synchronous gate drive complexity and supports legacy diode-based designs, though at modest efficiency penalty.
Availability
LM2831ZSDX is available at Aetrix Electronics and suitable for USB-powered devices, set-top boxes, HDD core power, DSL modems, and other industrial embedded applications requiring stable component supply with guaranteed long-term manufacturability.
Supply support for LM2831ZSDX 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-reliability DC-DC conversion.
The LM2831 product line was designed for space-constrained, high-frequency point-of-load regulation in consumer and computing applications - emphasizing minimal external components, thermal robustness, and seamless integration into 5V-sourced systems.
FAQ
What is the switching frequency of the LM2831ZSDX?
The LM2831ZSDX has a factory-set fixed switching frequency of 3.0 MHz, with a guaranteed range of 2.25 MHz to 3.75 MHz across temperature and input voltage. This high frequency allows use of sub-2 µH inductors and small ceramic capacitors, reducing total solution footprint. The frequency is not adjustable and does not require external timing components.
Does the LM2831ZSDX require an external catch diode?
Yes, the LM2831ZSDX requires an external Schottky catch diode connected between SW and GND. It does not integrate synchronous rectification. A low-forward-voltage (≤0.45 V), 1.5A-rated Schottky diode such as Toshiba CRS08 is recommended to maintain >90% efficiency at full load and minimize thermal stress on the IC.
What is the maximum output current capability of the LM2831ZSDX?
The LM2831ZSDX delivers up to 1.5A continuous output current under typical conditions (TA = 25°C, 2 oz copper, 4-layer PCB with thermal vias to DAP). Derating applies above 85°C ambient; at 125°C junction temperature, maximum sustainable output drops to ~1.0A depending on layout and airflow. Peak current limit is 2.5A typical.
How is the output voltage set on the LM2831ZSDX?
The output voltage of the LM2831ZSDX is set using a resistive divider from VOUT to GND, with the FB pin connected to the divider midpoint. The internal 0.600 V reference determines VOUT = 0.6 × (1 + R1/R2). For example, R2 = 10 kΩ and R1 = 45.3 kΩ yields 3.3 V. R2 should be ≥10 kΩ to minimize bias current error.
Can the LM2831ZSDX operate with a 3.3V input to generate 1.2V output?
Yes, the LM2831ZSDX supports input voltages from 3.0V to 5.5V and output voltages from 0.6V to 4.5V. At 3.3V input and 1.2V output, the duty cycle is ~36%, well within the 7–90% range specified for the LM2831Z variant. Efficiency exceeds 88% at 1.2V/1.5A per typical performance curves.
LM2831ZSDX 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:
- 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LM2831ZSDX FAQ
1.How can I place an order for LM2831ZSDX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2831ZSDX 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 LM2831ZSDX reliable?
The price and inventory of LM2831ZSDX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2831ZSDX is usually 5 days.
3.What payment methods are accepted for LM2831ZSDX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2831ZSDX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2831ZSDX?
LM2831ZSDX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2831ZSDX 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 LM2831ZSDX?
For technical support, including LM2831ZSDX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2831ZSDX requirements.
6.How does Aetrix verify that LM2831ZSDX is sourced from the original manufacturer or authorized distributors?
All LM2831ZSDX 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 LM2831ZSDX meets industry standards.
7.What is the process for return or replacement of LM2831ZSDX?
All LM2831ZSDX units undergo pre-shipment inspection (PSI). If there is an issue with LM2831ZSDX, 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 LM2831ZSDX part is unused and in its original packaging.
Return procedure for LM2831ZSDX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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