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Texas Instruments LM34919CQSDX/NOPB
- Part No.:
- LM34919CQSDX/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LM34919CQSDX/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 12WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM34919CQSDX/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 - used in automotive infotainment power rails and point-of-load regulation.
For engineers reviewing the LM34919CQSDX/NOPB datasheet, LM34919CQSDX/NOPB pinout, LM34919CQSDX/NOPB application, or LM34919CQSDX/NOPB equivalent, key selection criteria include valley current limit (0.64 A typical), no-loop-compensation architecture, power-good output with 92% VREF rising threshold, and DSBGA-12 package thermal performance (θJA = 61°C/W).
Technical Context
The LM34919CQSDX/NOPB implements a constant on-time control scheme where tON is inversely proportional to VIN and set by RON, enabling stable 2.6 MHz operation across 4.5–50 V input and load variations without external compensation. Its valley current limit detection at 0.64 A triggers off-time extension during overload, transitioning smoothly from CV to CC mode.
It integrates a start-up regulator (VCC = 7.0 V, 27 mA current limit), gate drive UVLO (2.95 V typical), soft-start (10.5 µA internal current source), and thermal shutdown (175°C trip, 20°C hysteresis). The PGD open-drain output asserts high when FB reaches 92% of 2.52 V reference, with 10 µs delay on falling edge.
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 - sufficient for microcontroller core rails, CAN transceivers, and display bias supplies. |
| Switching Frequency | Up to 2.6 MHz - enables use of small 1–2.2 µH inductors and compact 12-bump DSBGA layout. |
| Feedback Reference | 2.52 V ±20 mV - sets precise output voltage via external resistor divider (e.g., 3.3 V with R1/R2 = 0.32). |
| Valley Current Limit | 0.64 A typical - provides short-circuit protection without foldback; maintains regulation under moderate overload. |
| Shutdown IQ | <10 µA - enables low-power sleep modes in always-on automotive modules. |
| Power Good Threshold | Rising: 92% of VREF (2.32 V); Falling: 90% of VREF (2.27 V) - ensures reliable system sequencing and fault detection. |
Pinout & Package
LM34919CQSDX/NOPB is packaged in a 12-bump, 2 mm × 2 mm DSBGA (Die Size Ball Grid Array) with exposed die pad connected to RTN for thermal management (θJA = 61°C/W). Pin mapping is validated per TI SNVS831A Rev D (December 2013).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 4.5–50 V; withstands 65 V transient; powers internal regulators and buck switch. |
| SW | Switching node | Connects to inductor and freewheeling diode; carries high di/dt; requires tight layout to minimize EMI. |
| BST | Bootstrap capacitor connection | Requires 0.022 µF ceramic cap to SW; supplies gate drive voltage for high-side N-FET. |
| VCC | Startup regulator output | Internally regulated 7.0 V (±0.9 V); powers control logic; can be externally biased to reduce dissipation. |
| SS | Soft-start control | Internal 10.5 µA current source charges external cap; ramps FB reference to limit inrush current. |
| FB | Feedback input | Compares output voltage (via resistor divider) to 2.52 V reference; <1 nA bias current enables high-R dividers. |
| PGD | Power good open-drain | Asserts high when FB ≥ 2.32 V; requires external pull-up ≤14 V; signals valid output to host MCU. |
| EN | Enable input | Active-high; enables device above 2.1 V (typ.), disables below 1.3 V (typ.); draws <50 µA when active. |
| RON | On-time programming | Resistor from VIN to RON sets tON; determines switching frequency (e.g., 61.9 kΩ → ~1.5 MHz at VIN = 24 V). |
| ISEN | Current sense return | Carries recirculating inductor current during off-time; used for valley current limit detection at 0.64 A. |
| SGND | Sense ground | Separate ground path for current sensing; must be routed away from noisy power grounds to avoid false trips. |
| RTN | Circuit ground reference | Common return for internal circuitry except ISEN path; connects to PCB ground plane and exposed DSBGA pad. |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant on-time architecture eliminates need for external compensation network - reduces BOM count and design iteration time. |
| Ultra-fast transient response | On-time adjustment per cycle enables sub-microsecond recovery from load steps - critical for processor core rail stability. |
| Adjustable output voltage | Set via two-resistor divider referenced to 2.52 V internal reference - supports 1.2 V to 15 V outputs with ±1% accuracy. |
| Integrated start-up regulator | Delivers 7.0 V @ 27 mA from VIN - enables direct connection to automotive battery without external bias supply. |
| Power good with hysteresis | PGD asserts high at 92% VREF and releases at 90% VREF - prevents chatter during marginal output conditions. |
| AEC-Q100 Grade 1 qualification | Rated for TJ = −40°C to +125°C - certified for engine bay, infotainment head units, and ADAS domain controllers. |
Applications
| Automotive Infotainment Power Supply | Telematics Module POL Regulator |
|---|---|
|
Use Scenario: Supplies 3.3 V/600 mA to SoC peripherals, audio codecs, and USB PHY in head unit designs operating across 6–16 V battery range with load dump immunity. IC Role / Device Role / Timing Role: Primary buck controller implementing constant on-time regulation with no external compensation; manages startup sequencing via SS and PGD. Use Value: Enables compact 2 mm × 2 mm DSBGA layout, meets AEC-Q100 Grade 1 requirements, and sustains regulation during cold-crank (4.5 V) and load-dump (50 V) events. |
Use Scenario: Generates 5 V/400 mA for LTE modem, GNSS receiver, and CAN transceiver in vehicle-to-cloud telematics gateways. IC Role / Device Role / Timing Role: High-voltage buck regulator with integrated VCC startup and power-good signaling to MCU for safe boot and fault reporting. Use Value: Eliminates need for external LDO or charge pump; 2.6 MHz switching allows use of 1.5 µH inductor and 22 µF ceramic output cap; PGD confirms stable 5 V before modem initialization. |
| Secondary Side Post-Regulator | Industrial Control Sensor Bias Rail |
|
Use Scenario: Provides clean 1.8 V/300 mA post-regulation from a 5 V intermediate bus in ADAS camera modules with strict EMI limits. IC Role / Device Role / Timing Role: Secondary buck stage optimizing efficiency at light loads; operates in DCM below 100 mA with automatic frequency reduction. Use Value: Achieves >85% efficiency at 50 mA load; ultra-low 10 µA shutdown IQ preserves battery life in parked-mode monitoring; valley current limit prevents inductor saturation during sensor burst reads. |
Use Scenario: Powers isolated analog front-end (AFE), temperature sensors, and RS-485 transceivers in industrial PLC I/O modules powered from 24 V DC bus. IC Role / Device Role / Timing Role: Robust HV buck converter handling 24 V ±20% variation and 40 V surges; uses EN pin for remote enable/disable by PLC CPU. Use Value: Withstands 65 V absolute max input; RON-programmable frequency avoids noise-sensitive bands; thermal shutdown protects against enclosure overheating in sealed enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM34919QDSDX/NOPB | Same silicon, automotive-grade (Q1) variant with full AEC-Q100 documentation and extended temperature validation. | Required for production automotive programs needing PPAP support and full qualification reports. | Select LM34919QDSDX/NOPB when formal automotive qualification traceability is mandated; LM34919CQSDX/NOPB is suitable for pre-production evaluation and non-safety-critical subsystems. |
| TPS54340DDAR | Current-mode PWM controller (not COT); 3.5–42 V input; 3.5 A output; requires external compensation; larger SO-8 package. | Better suited for higher-current (>1 A) or lower-frequency (<1 MHz) designs where loop bandwidth tuning is needed. | Choose TPS54340DDAR only if design requires adjustable frequency, external current-sense resistor, or >1 A output - not a drop-in replacement due to different control architecture and pinout. |
Compared with LM34919QDSDX/NOPB, the LM34919CQSDX/NOPB offers identical electrical performance but lacks full AEC-Q100 certification documentation; versus TPS54340DDAR, it delivers faster transient response and smaller footprint but less flexibility in loop shaping and current rating.
Availability
LM34919CQSDX/NOPB is available at Aetrix Electronics and suitable for automotive infotainment, telematics, and industrial control applications requiring stable component supply, AEC-Q100-aligned reliability, and compact DSBGA packaging.
Supply support for LM34919CQSDX/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 50 years of automotive-grade product development and manufacturing excellence.
The LM34919C product line delivers ultra-small, high-voltage buck regulators optimized for space-constrained automotive subsystems requiring fast transient response, wide input range, and AEC-Q100 compliance - targeting infotainment, body electronics, and ADAS power rails.
FAQ
What is the maximum input voltage rating for LM34919CQSDX/NOPB?
The LM34919CQSDX/NOPB has an absolute maximum input voltage (VIN) rating of 65 V, with recommended operating range from 4.5 V to 50 V. This allows robust operation during automotive load-dump events (up to 50 V) while maintaining safety margin. Exceeding 65 V risks permanent damage per TI SNVS831A Absolute Maximum Ratings table.
Does LM34919CQSDX/NOPB require external compensation components?
No, the LM34919CQSDX/NOPB uses a constant on-time (COT) control architecture that eliminates the need for external compensation networks. Stability is inherent to the topology, enabling simplified design with only RON, feedback resistors, inductor, and input/output capacitors - verified across all operating conditions in TI's characterization data.
What is the purpose of the RON pin on LM34919CQSDX/NOPB?
The RON pin on LM34919CQSDX/NOPB sets the buck switch on-time via an external resistor from VIN to RON. This resistor directly determines switching frequency (e.g., 61.9 kΩ yields ~1.5 MHz at VIN = 24 V) and ensures near-constant frequency across input and load variations due to the inverse VIN–tON relationship.
How does the power good (PGD) output function on LM34919CQSDX/NOPB?
The PGD pin on LM34919CQSDX/NOPB is an open-drain output that pulls high (via external pull-up) when FB voltage reaches 92% of the 2.52 V internal reference (2.32 V), and pulls low when FB falls below 90% (2.27 V). It includes 10 µs delay on falling edge and requires ≤14 V pull-up - commonly tied to VOUT for sequencing.
Is LM34919CQSDX/NOPB pin-compatible with LM34919QDSDX/NOPB?
Yes, LM34919CQSDX/NOPB and LM34919QDSDX/NOPB share identical pinout, package (DSBGA-12), electrical specifications, and functional behavior. The Q1 variant adds full AEC-Q100 qualification documentation and extended test coverage, but both are mechanically and electrically interchangeable in PCB layout.
LM34919CQSDX/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 12-WFDFN Exposed Pad
- 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-WSON (4x4)
LM34919CQSDX/NOPB FAQ
1.How can I place an order for LM34919CQSDX/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34919CQSDX/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 LM34919CQSDX/NOPB reliable?
The price and inventory of LM34919CQSDX/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34919CQSDX/NOPB is usually 5 days.
3.What payment methods are accepted for LM34919CQSDX/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34919CQSDX/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34919CQSDX/NOPB?
LM34919CQSDX/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34919CQSDX/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 LM34919CQSDX/NOPB?
For technical support, including LM34919CQSDX/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34919CQSDX/NOPB requirements.
6.How does Aetrix verify that LM34919CQSDX/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34919CQSDX/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 LM34919CQSDX/NOPB meets industry standards.
7.What is the process for return or replacement of LM34919CQSDX/NOPB?
All LM34919CQSDX/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34919CQSDX/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 LM34919CQSDX/NOPB part is unused and in its original packaging.
Return procedure for LM34919CQSDX/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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