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Texas Instruments LM2833XSDX/NOPB
- Part No.:
- LM2833XSDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2833XSDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 10SON
- Quantity:
- Payment:
- Shipping:
Inventory:2,804
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Product details
Overview
LM2833XSDX/NOPB from Texas Instruments is a monolithic 1.5 MHz, 3.0A step-down DC-DC switching regulator in a 10-pin WSON package with 56 mΩ PMOS switch, 0.6 V ±2% internal reference, and peak current-mode control. It delivers regulated output from 0.6 V to 4.5 V across 3.0 V–5.5 V input, supporting USB-powered devices and core power in HDDs.
For engineers reviewing the LM2833XSDX/NOPB datasheet, LM2833XSDX/NOPB pinout, LM2833XSDX/NOPB application, or LM2833XSDX/NOPB equivalent, key selection criteria include verified 1.5 MHz fixed switching frequency, confirmed 3.0A steady-state output capability, validated thermal shutdown at 165°C, and documented soft-start duration of ~600 µs - all critical for compact, high-efficiency point-of-load designs.
Technical Context
The LM2833XSDX/NOPB implements peak current-mode control with internal compensation, enabling stable regulation without external loop components. Its 30 ns minimum on-time supports low-duty-cycle operation down to 0.6 V output even at 5.5 V input.
It integrates frequency foldback (reducing switching frequency to 400 kHz under low FB voltage), cycle-by-cycle current limiting (4.4 A typical), and output over-voltage protection triggered at 0.69 V FB threshold - all operating autonomously without external supervision.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.5 MHz fixed - enables use of sub-2.2 µH inductors and <22 µF ceramic output capacitors for ultra-compact layouts. |
| Output Current | 3.0 A steady-state - sustains full load without derating at TJ ≤ 125°C in WSON-10 package with θJA = 53°C/W. |
| Feedback Reference | 0.600 V ±2% - sets output voltage accuracy; enables 3.3 V output with 2 kΩ/10 kΩ resistor divider (±0.066 V total error). |
| RDS(ON) | 56 mΩ (MSOP-PowerPAD) / 58 mΩ (WSON) - determines conduction loss; at 3 A, contributes ~500 mW dissipation at full duty. |
| Quiescent Current | 5 mA typical (switching), 300 nA (shutdown) - enables >1000-hour battery life in always-on USB peripherals during standby. |
| UVLO Threshold | 2.70 V (rising), 2.35 V (falling) with 350 mV hysteresis - prevents erratic startup during brown-out conditions in portable systems. |
| Thermal Shutdown | 165°C activation, 15°C hysteresis - protects against sustained overload; recovery occurs only after junction cools to ~150°C. |
Pinout & Package
LM2833XSDX/NOPB uses a 3 mm × 3 mm, 10-pin WSON (DSC) package with exposed die attach pad (DAP) for thermal enhancement. Pin 1 is VINC; pins 7–8 are SW; pins 9–10 are VIND; DAP must be soldered to PCB ground plane for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VINC (Pin 1) | Bias supply input | Powers internal control circuitry; requires local 0.1 µF ceramic bypass to SGND to prevent noise coupling into regulation loop. |
| EN (Pin 2) | Enable logic input | Logic-high (>1.8 V) enables regulation; <0.4 V forces 300 nA shutdown; no internal pull-up - external driver required. |
| SGND (Pin 3) | Analog ground reference | Reference node for feedback divider; place R2 (lower FB resistor) directly adjacent to minimize trace inductance and load regulation error. |
| NC (Pin 4) | No-connect terminal | Internally unconnected; must be tied to PGND to prevent floating node EMI and ensure mechanical stability. |
| FB (Pin 5) | Feedback sensing node | Monitors output via resistor divider; 0.1 nA bias current allows use of high-value dividers (e.g., 1 MΩ/200 kΩ) to reduce quiescent loss. |
| PGND (Pin 6) | Power ground return | Carries high di/dt switch current; must connect directly to input/output capacitor ground pads with short, wide copper pour. |
| SW (Pins 7–8) | Power switch output | Drives external inductor and catch diode; dual pins reduce parasitic inductance and thermal resistance in high-current paths. |
| VIND (Pins 9–10) | Main input power | Accepts 3.0–5.5 V input; dual pins lower impedance and distribute current; requires local 10 µF ceramic + 0.1 µF ceramic bypass to PGND. |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft-start | ~600 µs ramp time - limits inrush current to <1.5× rated output, preventing input rail collapse during cold start. |
| Frequency foldback | Reduces fSW from 1.5 MHz to 400 kHz when FB < 0.32 V - curbs peak switch current during startup/short-circuit, limiting I2R losses. |
| Output over-voltage protection | Shuts off PMOS when FB exceeds 0.69 V (15% above 0.6 V ref) - prevents damage to downstream 3.3 V or 2.5 V logic during feedback fault. |
| Internally compensated control | Eliminates need for external compensation network - reduces BOM count by ≥3 components and layout area by >15 mm². |
| Ultra-low shutdown current | 300 nA typical - enables direct connection to coin-cell backup rails in always-on telemetry sensors without measurable drain. |
Applications
| Multimedia Set Top Box | USB Powered Devices |
|---|---|
Use Scenario: Powering SoC core voltage (1.2 V @ 2.5 A) and DDR memory interface (1.5 V @ 1.8 A) in compact set-top box enclosures with strict thermal limits. IC Role / Device Role / Timing Role: Primary buck regulator delivering tightly regulated, low-noise core power with fast transient response to handle video decode bursts. Use Value: 93% peak efficiency at 2 A load minimizes heatsink requirement; 1.5 MHz switching avoids audible noise in consumer audio subsystems. | Use Scenario: Providing 3.3 V/3.0 A power rail from 5 V USB host port to embedded microcontroller, Wi-Fi module, and sensor array in portable diagnostic tools. IC Role / Device Role / Timing Role: Single-chip DC-DC solution replacing discrete LDO + external FET, enabling USB bus-powered operation without violating 500 mA host limit. Use Value: 300 nA shutdown current extends battery backup runtime; EN pin allows MCU-controlled power sequencing during sleep/wake cycles. |
| Core Power in HDDs | Data Acquisition/Telemetry |
Use Scenario: Generating 1.8 V/2.8 A for HDD controller ASIC and 3.3 V/1.2 A for spindle motor driver from 5 V SATA rail in space-constrained NAS enclosures. IC Role / Device Role / Timing Role: High-current, high-frequency buck converter with integrated PMOS switch, eliminating external MOSFET footprint and gate drive complexity. Use Value: 56 mΩ RDS(ON) limits conduction loss to <470 mW at full load; thermal shutdown prevents data corruption during sustained write operations. | Use Scenario: Supplying 2.5 V/1.5 A to precision ADC, op-amps, and RF transceiver in remote environmental monitoring nodes powered by solar-charged Li-ion batteries. IC Role / Device Role / Timing Role: Efficient, low-quiescent buck regulator maintaining regulation across wide input range (3.2 V–5.5 V) as battery discharges. Use Value: 0.6 V reference enables accurate 2.5 V output with <±1.5% total error; UVLO hysteresis prevents oscillation during low-battery brownouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS6286418RTER | 4 MHz switching frequency, 2 A output, 0.6 V reference, but requires external compensation and has no frequency foldback. | Optimized for ultra-small inductors in wearables; lacks OVP and foldback - unsuitable for unattended industrial telemetry. | Select if board space is <25 mm² and load never exceeds 2 A; avoid where short-circuit robustness is mandatory. |
| MP2333HG-33-LF-Z | 3.3 V fixed output, 3 A, 1.5 MHz, but uses external feedback resistors for adjustable versions and lacks thermal hysteresis. | Targeted at fixed-output applications like FPGA I/O banks; thermal shutdown resets at 140°C (vs. 150°C for LM2833XSDX/NOPB). | Choose for cost-sensitive 3.3 V systems with known thermal margin; verify thermal recovery behavior matches system cooling profile. |
Compared with TPS6286418RTER and MP2333HG-33-LF-Z, LM2833XSDX/NOPB provides guaranteed 3.0 A output with integrated foldback, OVP, and 15°C thermal hysteresis - making it uniquely suited for unmonitored, high-reliability USB and HDD applications where fault containment is non-negotiable.
Availability
LM2833XSDX/NOPB is available at Aetrix Electronics and suitable for multimedia set-top boxes, USB-powered devices, and core power in HDDs requiring stable component supply across extended production lifecycles.
Supply support for LM2833XSDX/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 ICs, with over 90 years of innovation in high-reliability power conversion solutions.
The LM2833 product line delivers high-frequency, high-current step-down regulation in ultra-compact packages for space-constrained portable and embedded systems demanding efficiency, thermal resilience, and fault protection.
FAQ
What is the maximum supported input voltage for LM2833XSDX/NOPB?
The absolute maximum input voltage rating for LM2833XSDX/NOPB is 7 V on both VINC and VIND pins. However, the recommended operating range is strictly 3.0 V to 5.5 V per the datasheet's Operating Ratings table. Exceeding 5.5 V may cause premature UVLO exit or overstress internal bias circuitry, and operation above 7 V risks permanent damage. Always maintain input within 3.0–5.5 V for reliable long-term function of LM2833XSDX/NOPB.
Does LM2833XSDX/NOPB require external compensation components?
No, LM2833XSDX/NOPB features fully internal compensation using peak current-mode control architecture. The device achieves stable regulation across its full 0.6 V–4.5 V output range and 3.0 V–5.5 V input range without any external compensation capacitors or resistors. This eliminates tuning effort and reduces PCB area - a key design advantage confirmed in the "Internally Compensated Peak Current-Mode Control" feature list and Figure 15/16 loop gain plots of the LM2833XSDX/NOPB datasheet.
How does the frequency foldback function operate in LM2833XSDX/NOPB?
LM2833XSDX/NOPB activates frequency foldback when the FB pin voltage drops below 0.32 V (typical), reducing switching frequency from 1.5 MHz to 400 kHz. This occurs during startup, overload, or short-circuit events to limit peak switch current and power dissipation. Foldback is automatic and self-resetting - frequency returns to 1.5 MHz once FB rises above threshold. This behavior is explicitly characterized in Figure 14 and the Electrical Characteristics table under fFB parameter for LM2833X variants like LM2833XSDX/NOPB.
What is the thermal resistance (θJA) of LM2833XSDX/NOPB in its WSON package?
The junction-to-ambient thermal resistance (θJA) for LM2833XSDX/NOPB in the 10-pin WSON (DSC) package is 53°C/W under standard JEDEC 4-layer board conditions with still air. This value assumes proper soldering of the exposed DAP to a minimum 200 mm² copper pour. The datasheet specifies this in the Electrical Characteristics table under θJA, confirming thermal performance for LM2833XSDX/NOPB in real-world PCB layouts.
Can LM2833XSDX/NOPB be used with a 2.5 V input supply?
No, LM2833XSDX/NOPB cannot operate reliably with a 2.5 V input. Its under-voltage lockout (UVLO) rising threshold is 2.70 V (typical), and the recommended operating input range starts at 3.0 V. At 2.5 V, the device remains disabled - no switching occurs, and the output stays unregulated. Attempting to force operation below 3.0 V violates the Absolute Maximum Ratings and risks unstable behavior. LM2833XSDX/NOPB requires ≥3.0 V input for functional operation.
LM2833XSDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-WFDFN 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:
- 3A
- Frequency - Switching:
- 1.5MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-SON (3x3)
LM2833XSDX/NOPB FAQ
1.How can I place an order for LM2833XSDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2833XSDX/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 LM2833XSDX/NOPB reliable?
The price and inventory of LM2833XSDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2833XSDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2833XSDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2833XSDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2833XSDX/NOPB?
LM2833XSDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2833XSDX/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 LM2833XSDX/NOPB?
For technical support, including LM2833XSDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2833XSDX/NOPB requirements.
6.How does Aetrix verify that LM2833XSDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2833XSDX/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 LM2833XSDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2833XSDX/NOPB?
All LM2833XSDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2833XSDX/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 LM2833XSDX/NOPB part is unused and in its original packaging.
Return procedure for LM2833XSDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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