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Texas Instruments LM2833ZSDX/NOPB
- Part No.:
- LM2833ZSDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-WFDFN Exposed Pad
- Datasheet:
-
LM2833ZSDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 3A 10SON
- Quantity:
- Payment:
- Shipping:
Inventory:4,184
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Product details
Overview
LM2833ZSDX/NOPB from Texas Instruments is a monolithic 3.0 MHz, 3.0A synchronous step-down DC-DC regulator in a 10-pin WSON package with 56 mΩ internal PMOS switch, 0.6V ±2% reference, and peak current-mode control. It delivers regulated output voltages from 0.6V to 4.5V across 3.0V–5.5V input, supporting compact USB-powered devices and HDD core power rails.
For engineers reviewing the LM2833ZSDX/NOPB datasheet, LM2833ZSDX/NOPB pinout, LM2833ZSDX/NOPB application, or LM2833ZSDX/NOPB equivalent, key selection criteria include confirmed 3.0 MHz fixed switching frequency, 3.0A steady-state output capability, thermal shutdown at 165°C, frequency foldback under low FB conditions, and WSON-10 package compatibility with high-density PCB layouts.
Technical Context
The LM2833ZSDX/NOPB implements peak current-mode control with internal compensation and a fixed 3.0 MHz oscillator, enabling stable regulation without external loop components. Its 30 ns minimum on-time supports 0.6V output down to 3.0V input while maintaining duty cycle control.
It integrates cycle-by-cycle current limiting (4.4A typical), input UVLO (2.7V rising / 2.35V falling), output over-voltage protection (0.69V FB threshold), and thermal shutdown with 15°C hysteresis - all operating within −40°C to +125°C junction temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | Fixed 3.0 MHz - enables use of sub-1 µH inductors and small ceramic capacitors for minimal board area. |
| Output Current | 3.0 A steady-state - supports high-current loads like HDD spindle motors or FPGA core rails without external boost. |
| Input Voltage Range | 3.0 V to 5.5 V - matches USB 5V, Li-ion single-cell, and industrial 3.3V/5V supply rails. |
| Feedback Reference | 0.600 V ±2% - sets precise output voltage via resistor divider; line regulation <0.08%/V ensures stability across input range. |
| RDS(ON) | 56 mΩ (MSOP-PowerPAD) / 58 mΩ (WSON) - defines conduction loss at full load; measured at TJ = 25°C. |
| Quiescent Current | 4.3–6.5 mA (switching), 300 nA (shutdown) - enables ultra-low standby power in battery-backed systems. |
| Thermal Shutdown | 165°C trip, 150°C release - protects against sustained overload or poor heatsinking in sealed enclosures. |
Pinout & Package
LM2833ZSDX/NOPB uses a 3 mm × 3 mm, 10-pin WSON (Wettable Flank) package with exposed thermal pad (DAP). The DAP must be soldered to PCB ground plane for thermal performance and EMI reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VINC) | Bias supply input | Provides internal circuitry bias; requires local 0.1 µF bypass to SGND to stabilize control loop. |
| 2 (EN) | Enable control | Logic-high (>1.8 V) enables regulation; <0.4 V forces 300 nA shutdown; no internal pull-up - external driver required. |
| 3 (SGND) | Analog ground reference | Reference point for feedback network; place R2 (lower FB resistor) directly adjacent to minimize noise coupling. |
| 4 (NC) | No-connect | Internally unconnected; must be tied to PGND for mechanical stability and thermal path continuity. |
| 5 (FB) | Feedback sensing | Monitors resistor-divider output; 0.1–100 nA bias current allows high-value dividers to minimize quiescent loss. |
| 6 (PGND) | Power ground return | Primary return path for switch current; connect to DAP and input/output capacitor grounds with low-inductance trace. |
| 7,8 (SW) | Switch node outputs | Drives inductor and catch diode; high dv/dt node - minimize loop area and avoid routing near sensitive analog traces. |
| 9,10 (VIND) | Main input power | High-current VIN path; requires parallel 22 µF MLCC + 4.7 µF ceramic close to pins for transient suppression. |
| DAP | Die attach pad | Thermal and electrical connection to PCB ground; must be soldered with ≥60% coverage for θJA = 53°C/W rating. |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.0 MHz switching | Enables use of 0.47 µH–1.0 µH shielded ferrite inductors and eliminates need for external frequency programming. |
| Internal soft-start (600 µs) | Ramps reference from 0 V to 0.6 V to limit inrush current and prevent output overshoot during EN-triggered startup. |
| Frequency foldback | Reduces fSW from 3.0 MHz to 800 kHz when FB < 0.32 V - limits peak switch current during short-circuit or heavy overload. |
| Integrated 56 mΩ PMOS switch | Eliminates external high-side MOSFET and gate driver; reduces BOM count and layout complexity for 3 A applications. |
| Output over-voltage protection | Shuts off PMOS when FB exceeds 0.69 V (15% above 0.6 V ref) - prevents damage to downstream 1.8 V/2.5 V logic rails. |
Applications
| USB-Powered Devices | HDD Core Power |
|---|---|
|
Use Scenario: Portable media players and USB hubs requiring regulated 3.3 V or 1.8 V from 5 V bus power. IC Role / Device Role / Timing Role: Primary step-down regulator delivering clean, low-noise core voltage with fast transient response to burst data transfers. Use Value: 3.0 MHz operation minimizes inductor size (<1.0 µH), enabling full regulation in <100 mm² footprint while maintaining >90% efficiency at 2 A. |
Use Scenario: Spindle motor and controller IC power in 2.5-inch laptop HDDs with tight thermal constraints. IC Role / Device Role / Timing Role: High-current (3 A), thermally robust DC-DC converter supplying 1.2 V or 2.5 V core rail with integrated thermal shutdown. Use Value: 56 mΩ RDS(ON) and 165°C thermal shutdown enable continuous 3 A delivery in confined spaces without forced airflow. |
| Multimedia Set-Top Box | Data Acquisition Systems |
|
Use Scenario: Powering SoC cores, DDR memory, and video processing ASICs in consumer STBs with 5 V input rails. IC Role / Device Role / Timing Role: Compact, high-efficiency buck regulator replacing discrete solutions for multiple voltage domains (1.1 V, 1.8 V, 3.3 V). Use Value: Internal compensation and peak current-mode control ensure stable regulation across wide load steps (0.1 A → 3 A) without external tuning. |
Use Scenario: Precision sensor front-ends and ADC reference supplies in portable telemetry units powered by Li-ion batteries. IC Role / Device Role / Timing Role: Low-noise, tightly regulated 3.3 V or 5.0 V supply with <2% output tolerance and <10 mV ripple under dynamic load. Use Value: 0.6 V ±2% reference and <0.08%/V line regulation ensure consistent ADC reference accuracy across battery discharge (4.2 V → 3.0 V). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS628641RQYR | 3.0 MHz, 4 A, 2.7–6.5 V input, 50 mΩ FET, but requires external compensation and has no frequency foldback. | Higher current and wider input range; lacks integrated foldback and soft-start timing control. | Preferred where higher output current or extended input range is needed, but adds design complexity for loop tuning. |
| MP2451DT-LF-Z | 2.0 MHz, 2 A, 3.3–36 V input, 150 mΩ FET, no integrated soft-start or OVP, different pinout. | Broader input range for industrial 12 V/24 V rails; lower current and missing protection features limit use in USB/HDD apps. | Only suitable for non-critical 2 A applications with >3.3 V input and no OVP requirement; not drop-in compatible. |
Compared with LM2833ZSDX/NOPB, TPS628641RQYR offers higher current and input flexibility but increases BOM and layout effort due to external compensation, while MP2451DT-LF-Z trades protection and integration for wide-input capability - making LM2833ZSDX/NOPB optimal for space-constrained 3 A, 3–5.5 V designs needing full protection and simplicity.
Availability
LM2833ZSDX/NOPB is available at Aetrix Electronics and suitable for USB-powered devices, HDD core power, multimedia set-top boxes, and data acquisition systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM2833ZSDX/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 decades of expertise in high-efficiency DC-DC conversion and automotive-grade reliability.
The LM2833 series was designed specifically for compact, high-frequency, high-current point-of-load regulation in consumer and industrial equipment - emphasizing minimal external components, thermal robustness, and seamless integration into space-limited PCBs.
FAQ
What is the confirmed switching frequency of LM2833ZSDX/NOPB?
The LM2833ZSDX/NOPB has a factory-trimmed fixed switching frequency of 3.0 MHz, with typical variation between 2.25 MHz and 3.75 MHz across temperature and input voltage. This frequency is internally set and cannot be adjusted externally - it enables use of very small inductors and ceramic capacitors while maintaining stable regulation in high-density layouts.
Does LM2833ZSDX/NOPB require external compensation components?
No, LM2833ZSDX/NOPB uses internally compensated peak current-mode control and requires no external compensation network. The control loop is fully optimized for stability across its specified operating range (3.0V–5.5V input, 0.6V–4.5V output, up to 3.0A load), eliminating the need for external RC networks or loop tuning - simplifying design and reducing BOM count.
What package type does LM2833ZSDX/NOPB use, and is thermal pad connection mandatory?
LM2833ZSDX/NOPB uses the 3 mm × 3 mm, 10-pin WSON package (suffix "SDX") with an exposed die attach pad (DAP). Soldering the DAP to a solid PCB ground plane is mandatory to achieve the rated thermal performance (θJA = 53°C/W) and ensure reliable operation at 3.0A continuous load - insufficient DAP solder coverage risks thermal shutdown under sustained load.
How does LM2833ZSDX/NOPB handle short-circuit conditions?
Under short-circuit, LM2833ZSDX/NOPB activates frequency foldback - reducing switching frequency from 3.0 MHz to 800 kHz when FB falls below 0.32 V - and enforces cycle-by-cycle current limiting (4.4 A typical). If thermal limits are exceeded, it enters thermal shutdown at 165°C and remains latched off until junction temperature drops to ~150°C, preventing device damage.
Can LM2833ZSDX/NOPB operate with input voltage below 3.0 V?
No - LM2833ZSDX/NOPB has a guaranteed operating input range of 3.0 V to 5.5 V per datasheet specifications. Input voltage below 3.0 V triggers undervoltage lockout (UVLO), disabling regulation. The UVLO rising threshold is 2.70 V typical, with 350 mV hysteresis, meaning the part will not resume operation until VIN rises above ~2.35 V after dropout - making sub-3.0 V operation unsupported.
LM2833ZSDX/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:
- 3MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-SON (3x3)
LM2833ZSDX/NOPB FAQ
1.How can I place an order for LM2833ZSDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2833ZSDX/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 LM2833ZSDX/NOPB reliable?
The price and inventory of LM2833ZSDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2833ZSDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM2833ZSDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2833ZSDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2833ZSDX/NOPB?
LM2833ZSDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2833ZSDX/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 LM2833ZSDX/NOPB?
For technical support, including LM2833ZSDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2833ZSDX/NOPB requirements.
6.How does Aetrix verify that LM2833ZSDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2833ZSDX/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 LM2833ZSDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM2833ZSDX/NOPB?
All LM2833ZSDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2833ZSDX/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 LM2833ZSDX/NOPB part is unused and in its original packaging.
Return procedure for LM2833ZSDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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