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Texas Instruments LM34922MYX/NOPB
- Part No.:
- LM34922MYX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM34922MYX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 2A 10HVSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:2,473
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Product details
Overview
LM34922MYX/NOPB from Texas Instruments is a 28V, 2A constant on-time synchronous buck switching regulator with integrated N-channel MOSFET switch, adjustable current limit, and precision 2.51V feedback reference. It operates from 6V to 28V input, delivers up to 2A load current, and features power good (PGD) output and thermal shutdown - used in industrial power supplies, automotive auxiliary rails, and distributed DC-DC bias converters.
For engineers reviewing the LM34922MYX/NOPB datasheet, LM34922MYX/NOPB pinout, LM34922MYX/NOPB application, or LM34922MYX/NOPB equivalent, key selection criteria include its 10-pin HVSSOP-PowerPAD package, valley-current-limit-based overcurrent protection, COT topology enabling ceramic-capacitor stability without loop compensation, and adjustable soft-start timing via external capacitor.
Technical Context
The LM34922MYX/NOPB implements constant on-time (COT) control using an internal comparator comparing FB voltage against a 2.51V reference and a one-shot on-timer whose duration is inversely proportional to VIN and set by RT resistor. This architecture eliminates need for external compensation and ensures ultra-fast transient response.
Current limiting is achieved via valley-current sensing at CS/CSG pins with –130mV threshold, triggering ≈40% on-time reduction during overload. The integrated 2A N-channel buck switch, bootstrap gate driver (BST/SW), and thermal shutdown (155°C trip) enable robust operation in high-voltage industrial environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 6V to 28V operating range; supports 30V absolute max transients - enables direct use in 12V/24V automotive and industrial bus systems. |
| Output Current | 2A continuous average load current; peak switch current rated at 3.5A - sufficient for powering FPGAs, microcontrollers, and analog subsystems. |
| Feedback Reference | Precision 2.51V ±2% (2.46V–2.56V) internal reference - sets output voltage accuracy via RFB1/RFB2 divider; enables stable 3.3V, 5V, or custom rail generation. |
| Switching Frequency | Adjustable up to 1MHz via RT resistor; remains nearly constant across line/load - simplifies EMI filtering and allows compact magnetics. |
| Current Limit Threshold | –130mV typical at CS pin; adjustable via sense resistor RS - provides accurate, temperature-stable overcurrent protection without foldback. |
| Power Good Output | PGD asserts high when FB ≥ 95% of 2.51V (≈2.38V); includes hysteresis - enables reliable system sequencing and fault monitoring. |
| Thermal Shutdown | Triggers at 155°C junction temperature with 20°C hysteresis - protects against sustained overload or poor heatsinking in enclosed enclosures. |
Pinout & Package
LM34922MYX/NOPB is housed in a thermally enhanced 10-pin HVSSOP-PowerPAD (DGQ) package with exposed thermal pad on bottom, requiring connection to PCB ground plane for optimal thermal performance and electrical noise suppression.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Input supply voltage | Accepts 6V–28V DC; requires low-ESR capacitor placed adjacent to VIN/SGND - critical for high-frequency switching stability. |
| RT | On-time control | Resistor from VIN sets buck switch on-time and frequency; inverse relationship with VIN maintains near-constant fSW across input range. |
| PGD | Power good logic output | Open-drain output indicating VOUT regulation status; requires external pull-up ≤7V - used for system enable/disable sequencing. |
| SS | Soft-start control | Internal 10µA current source charges external CSS capacitor to ramp output voltage - prevents inrush current and overshoot at startup. |
| SGND | Signal ground | Reference for all internal circuitry except current sense path - must be separated from power ground to avoid noise coupling into FB/CS. |
| FB | Feedback input | Connects to voltage divider from VOUT; regulates output to 2.51V reference - determines final output voltage per VOUT = 2.51 × (1 + RFB1/RFB2). |
| CSG | Current sense ground | Ground return for current-sense amplifier; must connect directly to RS ground side and SGND - ensures accurate valley-current detection. |
| CS | Current sense input | Senses voltage drop across external sense resistor RS; threshold –130mV triggers current limit - enables precise, adjustable overcurrent protection. |
| SW | Switching node | Connects to inductor, diode cathode, and BST capacitor; carries high dv/dt switching waveform - layout critical for EMI and efficiency. |
| BST | Bootstrap capacitor connection | 0.1µF capacitor between BST and SW supplies gate drive for high-side N-MOSFET - enables efficient high-side switching without external charge pump. |
Key Features
| Feature | Design Value |
|---|---|
| Constant On-Time (COT) Control | Eliminates need for external compensation network; achieves ultra-fast load transient response (<1µs recovery) while maintaining stability with ceramic output capacitors. |
| Adjustable Valley Current Limit | Set via RS resistor; smooth transition from CV to CC mode without foldback - avoids output collapse during short-circuit events. |
| Integrated 2A N-Channel Buck Switch | Reduces BOM count and layout area; RDS(ON) = 0.6Ω max at 200mA - optimized for efficiency in 6V–28V input range with moderate load currents. |
| Power Good (PGD) Output | Digital flag signaling VOUT within ±5% of target; includes built-in hysteresis - enables safe processor reset, FPGA configuration, or downstream converter enable. |
| Thermal Shutdown with Hysteresis | 155°C trip / 135°C recovery; forces controller reset and grounds SS pin - prevents thermal runaway in sealed enclosures or high ambient conditions. |
Applications
| Industrial Power Supplies | Automotive Body Control Modules |
|---|---|
|
Use Scenario: Generating 3.3V/5V bias rails from 24V vehicle battery in BCMs with wide temperature and load variation. IC Role / Device Role / Timing Role: Primary step-down regulator delivering regulated 2A output; uses COT control to maintain tight regulation during cold-crank (6V) and load-dump (30V) transients. Use Value: Stable output under extreme input swings; PGD enables safe MCU boot sequencing; thermal shutdown prevents failure during prolonged high-temp operation. |
Use Scenario: Providing isolated 5V rail for CAN transceivers and sensor interfaces in engine control units. IC Role / Device Role / Timing Role: High-voltage buck converter with adjustable current limit protecting against shorted CAN lines or faulty sensors. Use Value: Valley-current limit detects faults before fuse blow; 2.51V reference ensures accurate 5V output even at –40°C to +125°C junction temp. |
| Programmable Logic Controllers | Industrial IoT Gateways |
|
Use Scenario: Powering FPGA I/O banks and auxiliary logic in PLC backplanes with strict ripple and transient requirements. IC Role / Device Role / Timing Role: Low-noise, fast-transient regulator supplying 1.8V/3.3V rails; leverages ceramic output caps enabled by COT stability. Use Value: Minimal output ripple (<15mV p-p typical); no compensation required reduces design cycle time; SS pin supports controlled power-up sequencing. |
Use Scenario: Converting 12V PoE-derived input to 3.3V for wireless SoCs and security modules in edge gateways. IC Role / Device Role / Timing Role: Efficient, compact DC-DC stage with thermal management for fanless enclosure designs. Use Value: HVSSOP-PowerPAD package dissipates heat effectively; 48°C/W θJA enables >1.5A continuous output at 70°C ambient without heatsink. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM5164MYX/NOPB | Wider 3V–100V input range; higher 4A output; requires external MOSFETs - not integrated switch. | Better suited for ultra-high-input applications (e.g., 48V telecom); lacks integrated 2A switch and valley-current limit simplicity. | Select LM5164MYX/NOPB only if input exceeds 28V or >2A output is required; LM34922MYX/NOPB offers lower BOM cost and simpler layout for 6V–28V range. |
| TPS54202DRCT | Lower 4.5V–28V input; 2A integrated FET; uses voltage-mode control with compensation - slower transient response than COT. | Requires external RC compensation; less tolerant of ceramic cap ESR variations; no PGD output. | Choose TPS54202DRCT if design prioritizes lower quiescent current (20µA) over transient speed; LM34922MYX/NOPB delivers superior dynamic performance in noisy industrial environments. |
Compared with LM5164MYX/NOPB and TPS54202DRCT, the LM34922MYX/NOPB uniquely combines integrated 2A N-FET, valley-current limiting, and COT control in a single 10-pin HVSSOP package - delivering faster transient response, simpler design, and tighter regulation for 6V–28V industrial and automotive bias rails.
Availability
LM34922MYX/NOPB is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and programmable logic controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for LM34922MYX/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-reliability power conversion solutions.
The LM34922MYX/NOPB belongs to TI's Constant On-Time (COT) buck regulator product line, designed specifically for high-voltage industrial and automotive DC-DC conversion where fast transient response, ceramic-capacitor compatibility, and integrated protection are essential.
FAQ
What is the recommended minimum output capacitance for stable operation of the LM34922MYX/NOPB?
The LM34922MYX/NOPB is stable with ceramic output capacitors as low as 10µF due to its constant on-time control architecture and internal emulated ripple mode (ERM). TI recommends ≥10µF X5R/X7R ceramic with ≤5mΩ ESR; larger values improve ripple suppression but are not required for loop stability. The LM34922MYX/NOPB datasheet Figure 20 shows 10µF achieving <15mV p-p ripple at full load.
How does the LM34922MYX/NOPB handle overcurrent conditions, and what happens to the switching frequency?
The LM34922MYX/NOPB uses valley-current limiting: when voltage at CS falls below –130mV during off-time, it reduces on-time by ≈40% and extends off-time, lowering average switching frequency. This results in constant-current behavior rather than foldback, maintaining predictable thermal stress. The LM34922MYX/NOPB continues operation until thermal shutdown activates at 155°C.
Can the LM34922MYX/NOPB be used in a tracking configuration, and what are the voltage limits on the SS pin?
Yes - applying a controlled voltage (0.5V–2.6V) to the SS pin causes VOUT to track that voltage scaled by the feedback divider ratio. The LM34922MYX/NOPB SS pin has absolute maximum rating of 3.0V and requires current limiting to ≤1mA. If tracking drops FB below 92% of 2.51V, PGD asserts low - enabling coordinated multi-rail sequencing using the LM34922MYX/NOPB.
What is the purpose of the CSG pin, and why must it be separated from SGND in layout?
The CSG pin is the dedicated ground return for the current-sense amplifier, isolating high-di/dt sense current paths from sensitive analog circuitry. Separating CSG from SGND prevents noise coupling into the FB and regulation comparator, ensuring accurate valley-current detection. TI specifies separate routing to RS ground and connection to SGND only at a single point - a critical layout rule for reliable current limit operation in the LM34922MYX/NOPB.
Does the LM34922MYX/NOPB require an external bootstrap diode, and how is the BST capacitor charged?
No external diode is needed - the LM34922MYX/NOPB integrates a high-voltage bootstrap diode. During switch off-time, SW drops to ≈–1V relative to SGND, allowing the internal diode to recharge the 0.1µF BST capacitor from the internal 5V regulator. Minimum off-time (90ns) ensures sufficient recharge time; violating this (e.g., excessive duty cycle) causes gate drive undervoltage lockout and shutdown.
LM34922MYX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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):
- 6V
- Voltage - Input (Max):
- 28V
- Voltage - Output (Min/Fixed):
- 2.51V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 2A
- Frequency - Switching:
- Adj to 1MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-HVSSOP
LM34922MYX/NOPB FAQ
1.How can I place an order for LM34922MYX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34922MYX/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 LM34922MYX/NOPB reliable?
The price and inventory of LM34922MYX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34922MYX/NOPB is usually 5 days.
3.What payment methods are accepted for LM34922MYX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34922MYX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34922MYX/NOPB?
LM34922MYX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34922MYX/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 LM34922MYX/NOPB?
For technical support, including LM34922MYX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34922MYX/NOPB requirements.
6.How does Aetrix verify that LM34922MYX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34922MYX/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 LM34922MYX/NOPB meets industry standards.
7.What is the process for return or replacement of LM34922MYX/NOPB?
All LM34922MYX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34922MYX/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 LM34922MYX/NOPB part is unused and in its original packaging.
Return procedure for LM34922MYX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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