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Texas Instruments LM2830XMFX
- Part No.:
- LM2830XMFX
- Manufacturer:
- Texas Instruments
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LM2830XMFX.pdf
- Description:
- IC REG BUCK ADJ 1A SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,013
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Product details
Overview
LM2830XMFX from Texas Instruments is a monolithic, high-frequency PWM step-down DC-DC regulator in a 5-pin SOT-23 package, delivering 1.0-A output current with internal 130-mΩ PMOS switch, 1.6-MHz fixed switching frequency, and 0.6-V ±2% internal reference. It regulates 3.0–5.5-V input to adjustable 0.6–4.5-V output for compact point-of-load conversion in space-constrained USB-powered devices.
For engineers reviewing the LM2830XMFX datasheet, LM2830XMFX pinout, LM2830XMFX application, or LM2830XMFX equivalent, key selection criteria include its 1.6-MHz operation enabling sub-3-mm² solution size, current-mode control for fast transient response, thermal shutdown at 165°C, soft-start limiting inrush, and ultra-low 30-nA shutdown current for battery-sensitive designs.
Technical Context
The LM2830XMFX implements constant-frequency current-mode PWM control with internal compensation, eliminating external loop components. Its 1.6-MHz oscillator supports ceramic inductors as small as 3.3 µH and 22-µF MLCCs on input/output, reducing PCB area versus lower-frequency buck regulators.
It integrates undervoltage lockout (UVLO) with 2.73-V turn-on threshold and 430-mV hysteresis, cycle-by-cycle current limit (1.75-A typical), overvoltage protection (15% above VFB), and thermal shutdown-enabling robust operation across –40°C to +125°C junction temperature without external supervision circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1.0 A continuous - supports core power for HDDs and set-top boxes without external current boosting. |
| Switching Frequency | 1.6 MHz - enables use of 3.3-µH inductors and 22-µF ceramic capacitors, minimizing solution footprint. |
| Input Voltage Range | 3.0 V to 5.5 V - compatible with single-cell Li-ion, USB 5-V, and 3.3-V/5-V rail systems. |
| Feedback Reference | 0.600 V ±2% - sets output voltage via resistor divider; enables 3.3-V, 1.8-V, or 1.2-V regulation with <1% error. |
| PMOS RDS(on) | 130 mΩ - limits conduction loss at 1-A load to ~130 mW, supporting >93% peak efficiency at 5-VIN/3.3-VOUT. |
| Shutdown Current | 30 nA - preserves battery life in always-on USB peripherals during deep sleep modes. |
| Thermal Shutdown | 165°C - protects IC under overload or poor heatsinking; auto-recovery at ~150°C. |
Pinout & Package
LM2830XMFX uses the 5-pin SOT-23 package (2.90 mm × 1.60 mm), optimized for low-profile, high-density layouts. Thermal performance relies on proper GND pad layout per TI's recommended footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW | Switch node output | Connects to inductor and catch diode anode; carries high di/dt switching current - requires short, wide trace and local ground pour. |
| GND | Signal and power ground | Primary return path for feedback network and internal circuits; bottom resistor of FB divider must be placed adjacent to this pin. |
| FB | Voltage feedback input | Senses output via resistor divider; high-impedance (≤100 nA bias) - sensitive to noise; route away from SW and VIN. |
| EN | Enable control input | Active-high logic interface; 1.8-V threshold - tie to VIN via 100-kΩ pull-up if always-on; float prohibited. |
| VIN | Power input supply | Accepts 3.0–5.5 V; requires local 22-µF X5R ceramic capacitor within 3 mm of pin to suppress switching transients. |
Key Features
| Feature | Design Value |
|---|---|
| Internal soft-start | Ramps reference from 0 V to 0.6 V over ~600 µs - limits inrush current into 22-µF output capacitor during power-up. |
| Current-mode PWM control | Enables inherent cycle-by-cycle current limiting and stable operation with ceramic output caps - no external compensation required. |
| Overvoltage protection | Shuts off PMOS switch when FB exceeds 0.69 V (15% above 0.6 V) - prevents damage to downstream 3.3-V or 1.8-V ICs. |
| Undervoltage lockout | Disables regulator below 2.3 V (falling) and re-enables above 2.73 V (rising) - avoids brownout instability during input ramp-up. |
| Thermal shutdown with hysteresis | Halts switching at 165°C junction temp; resumes only after cooldown to ~150°C - prevents thermal runaway in enclosed enclosures. |
Applications
| Local 5-V to Vcore Step-Down Converters | Core Power in HDDs |
|---|---|
Use Scenario: Regulating 5-V USB or main rail down to 1.2-V or 1.8-V CPU core voltage in portable SSD enclosures. IC Role / Device Role / Timing Role: Primary buck controller providing tightly regulated, low-noise Vcore with fast load-step response to handle burst I/O activity. Use Value: 1.6-MHz switching minimizes inductor size to fit within 12-mm height envelope; 1-A capability sustains peak disk spin-up current without droop. | Use Scenario: Supplying 3.3-V logic and 1.2-V servo control rails inside 2.5-inch hard disk drives. IC Role / Device Role / Timing Role: Point-of-load regulator converting 5-V system rail to isolated, low-ripple 3.3-V and 1.2-V domains. Use Value: Internal 130-mΩ PMOS and current-mode control maintain <1% output deviation during 500-ms motor startup surges. |
| USB Powered Devices | DSL Modems |
Use Scenario: Powering FPGA configuration logic, USB PHY, and microcontroller in bus-powered dongles and adapters. IC Role / Device Role / Timing Role: Single-chip DC-DC solution replacing linear regulators to extend battery runtime while meeting USB inrush limits. Use Value: 30-nA shutdown current extends shelf life of sealed USB accessories; soft-start ensures compliance with USB 2.0 power-up timing. | Use Scenario: Generating 3.3-V and 1.8-V supplies for ADSL line drivers and Ethernet PHYs in residential gateways. IC Role / Device Role / Timing Role: High-efficiency intermediate converter stepping down 5-V system rail to multiple low-voltage rails. Use Value: >93% peak efficiency reduces thermal load in fanless plastic enclosures; 1.6-MHz operation avoids AM radio band interference. |
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 | 1.6-MHz, 1-A, 0.6-V ref, but uses synchronous rectification (no external diode needed); 12-µA quiescent current in PWM mode. | Eliminates catch diode and associated board area; better light-load efficiency due to DCM mode. | Select TPS62231DRVR when minimizing BOM count and improving partial-load efficiency are priorities over absolute lowest shutdown current. |
| MP1471GJ-Z | 1.6-MHz, 1-A, 0.6-V ref, but rated for 2.5–5.5-V input; lacks OVP and has 100-nA shutdown current. | Broader input range suits 2-cell Li-ion inputs; missing OVP requires external clamping for safety-critical loads. | Select MP1471GJ-Z for cost-sensitive consumer applications where extended input range outweighs need for integrated overvoltage protection. |
Compared with LM2830XMFX, TPS62231DRVR offers higher integration and better light-load performance but trades off ultra-low shutdown current, while MP1471GJ-Z extends input range at the expense of protection features-making LM2830XMFX optimal for USB-powered designs requiring guaranteed OVP and 30-nA shutdown.
Availability
LM2830XMFX is available at Aetrix Electronics and suitable for USB powered devices, set-top boxes, and DSL modems requiring stable component supply with automotive-grade reliability and long-term production support.
Supply support for LM2830XMFX 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 designing analog ICs, embedded processors, and power management solutions for industrial, automotive, and consumer applications.
The LM2830 product line delivers high-frequency, low-profile buck regulators targeting space-constrained portable electronics where minimal external components and robust protection features are essential.
FAQ
What is the maximum output current supported by the LM2830XMFX?
The LM2830XMFX supports up to 1.0 A of continuous output current. This rating is validated across the full operating temperature range (–40°C to +125°C) and input voltage range (3.0 V to 5.5 V). The device incorporates cycle-by-cycle current limiting with a typical trip point of 1.75 A, ensuring safe operation during transient overloads without requiring external current-sense circuitry. For sustained 1-A loads, thermal design must ensure junction temperature remains below 125°C using the specified SOT-23 layout guidelines.
Does the LM2830XMFX require an external catch diode?
Yes, the LM2830XMFX requires an external Schottky catch diode connected between the SW pin and GND. Unlike synchronous buck regulators, it uses an internal PMOS high-side switch and relies on an external diode for low-side conduction during the off-time. TI recommends a 0.3-V forward-drop Schottky diode rated for ≥1.5 A (e.g., Toshiba CRS08) to minimize conduction losses and maximize efficiency. Omitting the diode will prevent proper regulation and may damage the IC.
How is the output voltage set on the LM2830XMFX?
The output voltage of the LM2830XMFX is set using a resistive divider connected to the FB pin. With a precise 0.600-V internal reference, the formula is VOUT = 0.6 × (1 + R1/R2), where R2 connects FB to GND and R1 connects VOUT to FB. For a 3.3-V output, R1 = 45 kΩ and R2 = 10 kΩ yields 3.3 V within tolerance. Layout best practice places R2 adjacent to the GND pin to minimize trace resistance errors, and both resistors should be 1% tolerance metal-film types for accuracy.
What is the purpose of the EN pin on the LM2830XMFX?
The EN pin on the LM2830XMFX provides active-high enable control: driving it above 1.8 V (typical) enables regulation, while pulling it below 0.4 V disables the device into ultra-low-power shutdown mode consuming only 30 nA. It must never be left floating - TI recommends connecting it to VIN through a 100-kΩ pull-up resistor for default-on operation. This pin allows system-level power sequencing, battery-saving sleep modes, and fault recovery resets without modifying the main power path.
Can the LM2830XMFX operate with a 3.3-V input to generate a 1.2-V output?
Yes, the LM2830XMFX supports 3.3-V input to generate 1.2-V output. Its input range (3.0 V to 5.5 V) and output adjustability (0.6 V to 4.5 V) fully cover this configuration. At 3.3-VIN/1.2-VOUT, the duty cycle is ~36%, well within the 5–94% operational window. Efficiency exceeds 90% at 1-A load per TI's typical curves, and the 1.6-MHz switching frequency maintains stability with standard 22-µF ceramic output capacitance. Ensure the catch diode forward drop and inductor DCR are minimized to preserve regulation accuracy.
LM2830XMFX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SC-74A, SOT-753
- 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:
- 1A
- Frequency - Switching:
- 1.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-23-5
LM2830XMFX FAQ
1.How can I place an order for LM2830XMFX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2830XMFX 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 LM2830XMFX reliable?
The price and inventory of LM2830XMFX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2830XMFX is usually 5 days.
3.What payment methods are accepted for LM2830XMFX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2830XMFX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2830XMFX?
LM2830XMFX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2830XMFX 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 LM2830XMFX?
For technical support, including LM2830XMFX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2830XMFX requirements.
6.How does Aetrix verify that LM2830XMFX is sourced from the original manufacturer or authorized distributors?
All LM2830XMFX 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 LM2830XMFX meets industry standards.
7.What is the process for return or replacement of LM2830XMFX?
All LM2830XMFX units undergo pre-shipment inspection (PSI). If there is an issue with LM2830XMFX, 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 LM2830XMFX part is unused and in its original packaging.
Return procedure for LM2830XMFX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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