My Inquiry
My Account
Texas Instruments LM2831ZSD/NOPB
- Part No.:
- LM2831ZSD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 6-WDFN Exposed Pad
- Datasheet:
-
LM2831ZSD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1.5A 6WSON
- Quantity:
- Payment:
- Shipping:
Inventory:975
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM2831ZSD/NOPB from Texas Instruments is a high-frequency, current-mode PWM step-down DC-DC regulator IC in a 6-pin WSON package, delivering up to 1.5-A output current with 3-MHz switching frequency, 0.6-V internal reference (±2% tolerance), and 130-mΩ PMOS switch. It operates from 3 V to 5.5 V input and supports adjustable output voltages down to 0.6 V - ideal for compact point-of-load conversion in USB-powered devices and set-top boxes.
For engineers reviewing the LM2831ZSD/NOPB datasheet, LM2831ZSD/NOPB pinout, LM2831ZSD/NOPB application, or LM2831ZSD/NOPB equivalent, key selection criteria include its 3-MHz fixed switching frequency, thermal shutdown at 165°C, 30-nA shutdown quiescent current, ±2% feedback voltage accuracy, and compatibility with ceramic output capacitors for low-ESR, fast-transient designs.
Technical Context
The LM2831ZSD/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 high duty-cycle operation down to 0.6-V output even at 5.5-V input.
It integrates undervoltage lockout (2.73-V enable threshold, 430-mV hysteresis), cycle-by-cycle current limiting (2.5-A typical limit), overvoltage protection (15% above VREF), and internal soft-start (600-µs ramp). The WSON package features a die-attach pad for enhanced thermal performance (RθJA = 54.9°C/W).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 3 MHz - enables use of sub-2.2-µH inductors and 22-µF ceramic output capacitors, minimizing PCB footprint. |
| Output Current | 1.5 A continuous - sufficient for core power in HDDs, USB peripherals, and DSL modems. |
| Feedback Voltage | 0.600 V ±2% - sets precise output voltage via external resistor divider; supports 0.6–4.5 V range. |
| Input Voltage Range | 3 V to 5.5 V - matches standard USB 5-V and Li-ion battery (3.3–4.2 V) supply rails. |
| PMOS Switch RDS(ON) | 130 mΩ (TJ = 25°C) - limits conduction loss at 1.5-A load; rises to 195 mΩ at 125°C. |
| Quiescent Current | 4.3 mA (switching), 30 nA (shutdown) - enables ultra-low-power standby in always-on applications. |
| Thermal Shutdown | 165°C activation, ~150°C recovery - protects against sustained overload or poor heatsinking. |
Pinout & Package
LM2831ZSD/NOPB uses a 6-pin WSON (NGG) package, 3.00 mm × 3.00 mm, with exposed die-attach pad (DAP) connected to system ground for thermal management. The DAP is not a primary GND path but reduces junction-to-board thermal resistance to 29.2°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| EN (Pin 6) | Enable control input | Logic-high active; must be tied ≥1.8 V to enable; floating or >VINA+0.3 V risks damage. |
| FB (Pin 1) | Feedback input | Monitors output via resistor divider; error amplifier compares to 0.6-V reference to regulate VO. |
| SW (Pin 3) | Switch node output | Drives external inductor and catch diode; swings from VIN to ~–0.3 V during off-time. |
| VINA (Pin 5) | Control circuitry supply | Bias rail for internal logic; must be shorted to VIND on PCB; not intended as main power input. |
| VIND (Pin 4) | Main power input | Supplies PMOS switch and high-current paths; decoupled with 22-µF X5R ceramic capacitor. |
| GND (Pin 2) | Signal & power ground | Reference for FB network; place bottom feedback resistor adjacent to this pin to minimize noise. |
Key Features
| Feature | Design Value |
|---|---|
| 3-MHz fixed-frequency PWM | Enables <2.2-µH inductors and eliminates audible noise; supports fast transient response without frequency jitter. |
| Internal 0.6-V ±2% reference | Ensures output voltage accuracy within ±2% over –40°C to 125°C; eliminates need for external precision reference. |
| Integrated soft-start (600 µs) | Controls output ramp rate to limit inrush current into large output capacitors, preventing input rail droop. |
| Pulse-by-pulse current limit | Protects switch during short-circuit or overload by disabling SW each cycle when current exceeds 2.5 A (typical). |
| Overvoltage protection (OVP) | Shuts off SW if FB exceeds 15% above 0.6 V (i.e., >0.69 V), preventing damage to downstream 3.3-V or 1.8-V loads. |
Applications
| USB-Powered Devices | Set-Top Boxes |
|---|---|
Use Scenario: Powering SoC cores and peripherals from 5-V USB host port under variable load (0–1.5 A). IC Role / Device Role / Timing Role: Primary step-down regulator converting 5 V to 1.2 V/1.8 V/3.3 V with fast load-step response. Use Value: 3-MHz switching minimizes inductor size and avoids interference with USB 2.0 high-speed signaling (480 Mbps). |
Use Scenario: Local regulation for video decoder, tuner, and HDMI interface ICs requiring clean 3.3-V and 1.2-V rails. IC Role / Device Role / Timing Role: Compact, thermally efficient buck converter placed near load to reduce IR drop and noise coupling. Use Value: 130-mΩ RDS(ON) and 90% peak efficiency at 1.5-A load reduce heat buildup in sealed enclosures. |
| HDD Core Power | DSL Modems |
Use Scenario: Supplying 1.2-V CPU core and 2.5-V I/O for embedded ARM-based HDD controller ASICs. IC Role / Device Role / Timing Role: High-efficiency, low-noise local DC-DC converter with tight output voltage regulation. Use Value: ±2% VFB accuracy ensures stable core voltage across temperature, preventing timing violations. |
Use Scenario: Generating 3.3-V analog front-end (AFE) and 1.2-V digital signal processor (DSP) supplies from 5-V adapter. IC Role / Device Role / Timing Role: Single-chip buck solution replacing discrete MOSFET + controller for space-constrained modem PCBs. Use Value: Internal compensation and 3-MHz operation eliminate external compensation network, saving 3–4 passives per rail. |
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 | 2.5-MHz switching, 3-A output, 0.6-V reference, but requires external compensation and has higher quiescent current (17 µA shutdown vs. 30 nA). | Higher current capability suits more demanding loads; less suitable for ultra-low-power standby modes. | Select when >1.5-A output or tighter light-load efficiency is required; verify layout for higher peak currents. |
| MP2108DJ-LF-Z | 1.5-MHz switching, 2-A output, 0.8-V reference (not 0.6 V), no integrated OVP, and 150-mΩ switch RDS(ON). | Lacks overvoltage protection and has coarser output voltage granularity; better suited for non-critical 3.3-V/5-V rails. | Choose for cost-sensitive designs where OVP is handled externally and 0.6-V minimum output is not needed. |
Compared with TPS62130ARGTR and MP2108DJ-LF-Z, LM2831ZSD/NOPB offers superior shutdown current (30 nA), tighter VFB accuracy (±2%), and integrated OVP - making it optimal for USB-powered, thermally constrained, and safety-aware applications where reliability and minimal BOM count are critical.
Availability
LM2831ZSD/NOPB is available at Aetrix Electronics and suitable for USB-powered devices, set-top boxes, HDD core power, and DSL modems requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.
Supply support for LM2831ZSD/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, embedded processing, and power management ICs, with leadership in high-efficiency DC-DC conversion and automotive-grade reliability.
The LM2831ZSD/NOPB belongs to TI's LM28xx family of monolithic step-down regulators, designed specifically for space-constrained, high-frequency point-of-load applications in consumer and networking equipment where small size, low EMI, and fast transient response are essential.
FAQ
What is the switching frequency of the LM2831ZSD/NOPB?
The LM2831ZSD/NOPB has a fixed switching frequency of 3 MHz, as indicated by the "Z" suffix in its part number. This is confirmed in Section 6.5 of the SNVS422D datasheet, where FSW is specified as 3 MHz (typical) over –40°C to 125°C. The 3-MHz operation allows use of miniature inductors and ceramic capacitors while maintaining high efficiency and low output ripple.
Does the LM2831ZSD/NOPB require external compensation components?
No, the LM2831ZSD/NOPB features internal compensation and does not require external compensation components. As stated in Section 7.1 of the datasheet, it is "internally compensated, so the device is simple to use and requires few external components." This simplifies design, reduces BOM count, and improves consistency across production units.
What is the maximum output current supported by the LM2831ZSD/NOPB?
The LM2831ZSD/NOPB is rated for up to 1.5-A continuous output current, as specified in the Features section and Electrical Characteristics table (IOUT = 1.5 A). This rating assumes proper thermal management using the WSON package's exposed DAP pad and adequate PCB copper area, given its RθJA of 54.9°C/W.
How does the LM2831ZSD/NOPB handle overvoltage conditions?
The LM2831ZSD/NOPB includes integrated overvoltage protection (OVP) that disables the internal PMOS switch if the FB pin voltage exceeds 15% above the 0.6-V internal reference (i.e., >0.69 V). As described in Section 7.3.3, this prevents damage to downstream 1.2-V or 1.8-V loads during feedback network faults or transient surges.
What package type is used for the LM2831ZSD/NOPB?
The LM2831ZSD/NOPB uses a 6-pin WSON (NGG) package measuring 3.00 mm × 3.00 mm with an exposed die-attach pad (DAP). This is explicitly listed in the "Device Information" table of the SNVS422D datasheet and distinguishes it from the 5-pin SOT-23 variant (e.g., LM2831ZSDX/NOPB). The DAP must be soldered to a thermal pad on the PCB for optimal thermal performance.
LM2831ZSD/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 6-WDFN Exposed Pad
- 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:
- 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-WSON (3x3)
LM2831ZSD/NOPB FAQ
1.How can I place an order for LM2831ZSD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2831ZSD/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 LM2831ZSD/NOPB reliable?
The price and inventory of LM2831ZSD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2831ZSD/NOPB is usually 5 days.
3.What payment methods are accepted for LM2831ZSD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2831ZSD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2831ZSD/NOPB?
LM2831ZSD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2831ZSD/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 LM2831ZSD/NOPB?
For technical support, including LM2831ZSD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2831ZSD/NOPB requirements.
6.How does Aetrix verify that LM2831ZSD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2831ZSD/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 LM2831ZSD/NOPB meets industry standards.
7.What is the process for return or replacement of LM2831ZSD/NOPB?
All LM2831ZSD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2831ZSD/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 LM2831ZSD/NOPB part is unused and in its original packaging.
Return procedure for LM2831ZSD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM2831ZSD/NOPB Tags
-
TPS562201DDCR
Texas Instruments
-
MC34063ABD-TR
STMicroelectronics
-
TPS561201DDCR
Texas Instruments
-
MC33063ADR
Texas Instruments
-
MC34063ADR
Texas Instruments
-
TPS560200DBVR
Texas Instruments
-
AP3012KTR-G1
Diodes Incorporated
-
TLV61048DBVR
Texas Instruments
-
AZ34063UMTR-G1
Diodes Incorporated
-
TPS562200DDCR
Texas Instruments
-
AP62300TWU-7
Diodes Incorporated
-
MC34063EBD-TR
STMicroelectronics
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
