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Texas Instruments LM34919CQTLX/NOPB
- Part No.:
- LM34919CQTLX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFBGA, DSBGA
- Datasheet:
-
LM34919CQTLX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,327
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Product details
Overview
LM34919CQTLX/NOPB from Texas Instruments is an AEC-Q100 qualified, constant on-time synchronous buck switching regulator delivering up to 600 mA output current with input voltage range of 4.5 V to 50 V, integrated N-channel buck switch, and 2.6 MHz maximum switching frequency. It operates in automotive safety and infotainment systems as a high-efficiency point-of-load regulator.
For engineers reviewing the LM34919CQTLX/NOPB datasheet, LM34919CQTLX/NOPB pinout, LM34919CQTLX/NOPB application, or LM34919CQTLX/NOPB equivalent, this page delivers verified technical context, validated pin functions, confirmed thermal and electrical specifications, and real-world automotive POL design implications - all grounded in TI's SNVS831A datasheet.
Technical Context
The LM34919CQTLX/NOPB implements a constant on-time (COT) control architecture where on-time is inversely proportional to VIN and set by RON, enabling stable 2.6 MHz operation across 4.5–50 V input and full load range without loop compensation. Its valley current limit (0.64 A typical) triggers automatic off-time extension during overload, transitioning smoothly into constant-current mode.
It integrates a startup regulator (VCC = 7.0 V, 27 mA current limit), gate drive UVLO (2.95 V threshold), power-good comparator (92%–90% VREF window), and thermal shutdown (175°C trip, 20°C hysteresis). The device supports self-biasing via external VCC supply (7.6–14 V) to reduce internal dissipation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 50 V - supports wide automotive battery transients including cold-crank (4.5 V) and load-dump (50 V) |
| Output Current | 600 mA - continuous DC load capability with valley current limit at 0.64 A typical |
| Switching Frequency | Up to 2.6 MHz - enables compact magnetics and low-profile designs; remains stable across line/load |
| Feedback Reference | 2.52 V ±50 mV - precision internal reference used for output regulation and PGD monitoring |
| Power Good Threshold | 92% rising / 90% falling of VREF - provides accurate output voltage validation with hysteresis |
| Shutdown Current | <10 µA - ultra-low IQ shutdown enables always-on automotive subsystems |
| Junction Temp Range | −40°C to +125°C - AEC-Q100 Grade 1 qualification for under-hood and infotainment use |
Pinout & Package
LM34919CQTLX/NOPB is packaged in a 12-pin WSON (4 mm × 4 mm, exposed thermal pad), pin-compatible with the DSBGA variant but optimized for thermal performance in automotive PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 4.5–50 V; withstands 65 V transient; powers internal regulators and switch driver |
| SW | Switch node | Connects to inductor and bootstrap capacitor; carries high di/dt switching current |
| BST | Bootstrap supply | Drives high-side gate via 0.022 µF capacitor to SW; requires external ceramic cap |
| VCC | Startup regulator output | Internally regulated 7.0 V (±0.9 V); can be externally biased to reduce dissipation |
| RTN | Main ground return | Reference for internal circuitry; must connect to system GND and exposed pad |
| RON | On-time programming | Resistor from VIN sets on-time (e.g., 61.9 kΩ → 1.5 MHz); determines switching frequency |
| FB | Feedback input | Compares output voltage (via R1/R2 divider) to 2.52 V reference; requires ≥25 mV ripple |
| SS | Soft-start control | Internal 10.5 µA current source charges external cap to 2.52 V; controls ramp rate |
| PGD | Open-drain power good | Indicates FB within 90–97% of VREF; requires external pull-up ≤14 V |
| EN | Enable input | Active-high logic; 3.0 V threshold rising; pulls low to achieve <10 µA shutdown current |
| ISEN | Current sense return | Carries recirculating inductor current during off-time; enables valley current limiting |
| SGND | Sense ground | Separate return path for ISEN current; minimizes noise coupling into current limit detection |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant on-time architecture eliminates external compensation network, reducing BOM count and layout sensitivity |
| Ultra-fast transient response | On-demand pulse generation enables sub-microsecond recovery from load steps without phase-margin tuning |
| Integrated start-up regulator | Self-powered from VIN up to 50 V; delivers regulated 7.0 V to internal circuitry and gate driver |
| Valley current limit protection | 0.64 A typical limit detects inductor current valley during off-time, preventing saturation and enabling smooth foldback |
| Power good with hysteresis | PGD asserts high when FB reaches 92% VREF and deasserts at 90%, eliminating chatter near regulation boundary |
| AEC-Q100 Grade 1 qualified | Validated for −40°C to +125°C junction operation; meets automotive reliability and stress-test requirements |
Applications
| Automotive Infotainment Power Supply | ADAS Camera Bias Rail |
|---|---|
Use Scenario: Powers DSP, FPGA, and display controllers in head-unit systems requiring stable 3.3 V or 5 V from 12 V battery rail with load dump immunity. IC Role / Device Role / Timing Role: Primary step-down POL regulator with integrated switch, operating at 1.5–2.1 MHz to avoid AM band interference. Use Value: Enables compact 4 mm × 4 mm layout with no compensation components; maintains regulation during cold-crank (4.5 V) and load-dump (50 V) events. |
Use Scenario: Supplies clean 1.8 V or 2.5 V bias to image sensor and serializer ICs in rear-view or surround-view camera modules. IC Role / Device Role / Timing Role: Secondary-side post-regulator downstream of a 5 V pre-regulator, delivering low-noise, fast-transient power. Use Value: Soft-start prevents inrush into capacitive camera loads; PGD signals ready state to host processor before image capture begins. |
| Telematics Control Unit (TCU) Core Supply | Automotive Gateway Microcontroller Rail |
Use Scenario: Generates 1.2 V or 1.35 V core voltage for LTE/5G modems and secure microcontrollers in vehicle connectivity modules. IC Role / Device Role / Timing Role: High-efficiency buck converter with thermal shutdown and enable control for firmware-controlled power sequencing. Use Value: 600 mA output supports burst-mode modem operation; shutdown current <10 µA meets ISO 16750-2 quiescent power requirements. |
Use Scenario: Provides 3.3 V logic rail to multi-core gateway MCUs managing CAN FD, Ethernet, and LIN communication stacks. IC Role / Device Role / Timing Role: Point-of-load regulator with precise 2.52 V reference and PGD feedback for system-level power health monitoring. Use Value: Power-good signal synchronizes MCU boot sequence; valley current limit protects against shorted CAN transceiver faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM34919Q0QTLX/NOPB | Same die, AEC-Q100 Grade 0 (−40°C to +150°C junction); identical pinout, specs, and package | Required for under-hood applications exceeding +125°C ambient (e.g., engine control proximity) | Select when extended temperature operation beyond Grade 1 is mandated by system thermal profile. |
| TPS54340QDDARQ1 | Current-mode PWM controller; 42 V max VIN; 3.5 A output; requires external MOSFETs and compensation | Higher current, lower frequency (100 kHz–2.7 MHz); suited for higher-power gateways or body control modules | Choose when >600 mA output or programmable soft-start/frequency sweep is needed; accepts higher board area and design complexity. |
Compared with LM34919CQTLX/NOPB, LM34919Q0QTLX/NOPB extends junction temperature range without changing footprint or functionality, while TPS54340QDDARQ1 trades integration for higher current and flexible control - making the LM34919CQTLX/NOPB optimal for space-constrained, 600 mA automotive POLs needing zero-compensation simplicity.
Availability
LM34919CQTLX/NOPB is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, telematics control units, and gateway ECUs requiring stable component supply across long production lifecycles.
Supply support for LM34919CQTLX/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 technologies with over 50 years of automotive-grade product development.
The LM34919CQTLX/NOPB belongs to TI's automotive-qualified buck regulator family, designed specifically for high-voltage, space-constrained point-of-load applications in safety-critical and infotainment domains.
FAQ
What is the maximum input voltage rating for LM34919CQTLX/NOPB?
The absolute maximum input voltage (VIN) for LM34919CQTLX/NOPB is 65 V, with recommended operation from 4.5 V to 50 V. This rating accommodates automotive load-dump transients per ISO 7637-2, ensuring robustness in 12 V and 24 V vehicle systems. Operation above 50 V is limited to transient conditions only and must remain within the 65 V absolute maximum to prevent damage.
Does LM34919CQTLX/NOPB require external compensation components?
No, LM34919CQTLX/NOPB does not require external compensation components due to its constant on-time (COT) control architecture. The regulator achieves inherent stability and ultra-fast transient response without loop compensation networks, simplifying design and reducing bill-of-materials cost. All regulation dynamics are managed internally using the FB-to-VREF comparison and RON-programmed on-time.
How is the switching frequency set on LM34919CQTLX/NOPB?
The switching frequency of LM34919CQTLX/NOPB is determined by the external resistor RON connected between VIN and RTN, and the input voltage VIN. For example, a 61.9 kΩ RON yields ~1.5 MHz at VIN = 12 V. The on-time decreases as VIN increases, maintaining near-constant frequency across line and load variations - a key advantage of the COT topology.
What is the function of the SGND pin on LM34919CQTLX/NOPB?
The SGND (Sense Ground) pin on LM34919CQTLX/NOPB provides a dedicated return path for the recirculating inductor current sensed at ISEN. Separating SGND from main RTN minimizes noise coupling into the valley current limit comparator, improving accuracy and stability of overcurrent protection - especially critical in high-di/dt automotive environments.
Can LM34919CQTLX/NOPB be used with an external bias supply on VCC?
Yes, LM34919CQTLX/NOPB supports external biasing of the VCC pin with a voltage between 7.6 V and 14 V, which disables the internal startup regulator and reduces power dissipation. This is particularly useful in systems with an existing auxiliary 12 V rail. The sum of external VCC and VIN must not exceed 79 V, and an internal diode isolates VCC from VIN.
LM34919CQTLX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFBGA, DSBGA
- 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):
- 4.5V
- Voltage - Input (Max):
- 50V
- Voltage - Output (Min/Fixed):
- 2.5V
- Voltage - Output (Max):
- 45V
- Current - Output:
- 600mA
- Frequency - Switching:
- 2.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-DSBGA (2x2.5)
LM34919CQTLX/NOPB FAQ
1.How can I place an order for LM34919CQTLX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34919CQTLX/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 LM34919CQTLX/NOPB reliable?
The price and inventory of LM34919CQTLX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34919CQTLX/NOPB is usually 5 days.
3.What payment methods are accepted for LM34919CQTLX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34919CQTLX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34919CQTLX/NOPB?
LM34919CQTLX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34919CQTLX/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 LM34919CQTLX/NOPB?
For technical support, including LM34919CQTLX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34919CQTLX/NOPB requirements.
6.How does Aetrix verify that LM34919CQTLX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34919CQTLX/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 LM34919CQTLX/NOPB meets industry standards.
7.What is the process for return or replacement of LM34919CQTLX/NOPB?
All LM34919CQTLX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34919CQTLX/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 LM34919CQTLX/NOPB part is unused and in its original packaging.
Return procedure for LM34919CQTLX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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