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Texas Instruments LM34919CQTL/NOPB
- Part No.:
- LM34919CQTL/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFBGA, DSBGA
- Datasheet:
-
LM34919CQTL/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:427
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Product details
Overview
LM34919CQTL/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 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 LM34919CQTL/NOPB datasheet, LM34919CQTL/NOPB pinout, LM34919CQTL/NOPB application, or LM34919CQTL/NOPB equivalent, key selection criteria include valley current limit (0.64 A typical), power good output with 92%–90% VREF thresholds, no loop compensation requirement, and DSBGA-12 (2 mm × 2 mm) package compatibility with high-density automotive PCB layouts.
Technical Context
The LM34919CQTL/NOPB implements a constant on-time control architecture 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. It integrates a 7 V startup regulator, valley current sensing via ISEN/SGND, and internal 2.52 V precision reference for FB-based regulation.
Its functional block includes gate drive UVLO (2.95 V typical), thermal shutdown at 175°C, enable input with 1.3 V falling threshold, and open-drain PGD with 10 µs delay - all operating over –40°C to +125°C junction temperature per AEC-Q100 Grade 1.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 4.5 V to 50 V - supports direct connection to automotive battery (cold-crank down to 4.5 V) and transient tolerance to 65 V. |
| Output Current | 600 mA continuous - sufficient for microcontroller cores, CAN transceivers, and display bias rails in safety-critical systems. |
| Switching Frequency | Up to 2.6 MHz - enables use of small 1–2.2 µH inductors and ceramic output capacitors in space-constrained modules. |
| Valley Current Limit | 0.64 A typical - provides smooth transition into constant-current mode during short-circuit without foldback, reducing stress on external diode and inductor. |
| Reference Voltage | 2.52 V ±20 mV - sets output accuracy; combined with FB resistor divider, enables precise 3.3 V, 5 V, or custom POL voltages. |
| Power Good Threshold | 92% rising / 90% falling of VREF - ensures reliable system sequencing with 10 µs delay, compatible with MCU reset timing requirements. |
| Shutdown Current | <10 µA - meets automotive low-power standby requirements when EN is pulled low. |
Pinout & Package
LM34919CQTL/NOPB is packaged in a 12-bump DSBGA (2 mm × 2 mm, 0.5 mm pitch) with exposed die pad connected to RTN for thermal performance. Pin mapping follows TI's standard bump layout for this variant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Main input supply | Accepts 4.5–50 V; withstands 65 V transients; powers internal regulators and gate driver. |
| SW | Switching node | Connects to inductor and freewheeling diode; carries high di/dt; requires tight layout to minimize EMI. |
| BST | Bootstrap capacitor terminal | Requires 0.022 µF capacitor to SW; supplies floating gate drive voltage for N-channel high-side switch. |
| VCC | Startup regulator output | Internally regulated 7.0 V (±0.9 V); powers control circuitry; can be externally biased to reduce dissipation. |
| FB | Feedback input | Compares output voltage (via resistor divider) to 2.52 V reference; <1 nA bias current enables high-impedance dividers. |
| PGD | Power good open-drain output | Indicates regulation status; requires external pull-up ≤14 V; asserts high when FB ≥ 92% VREF. |
| EN | Enable control | Active-high; device enabled above 2.1 V, disabled below 1.3 V; 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 trip. |
| RTN | Regulator ground | Main analog/digital ground reference; connects to PCB ground plane and exposed DSBGA pad. |
| SS | Soft-start capacitor node | Internal 10.5 µA current source charges external cap to 2.52 V; controls output ramp rate (e.g., 5 ms with 0.022 µF). |
Key Features
| Feature | Design Value |
|---|---|
| No loop compensation required | Constant on-time architecture eliminates external compensation network, reducing 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. |
| AEC-Q100 Grade 1 qualification | Validated for automotive operation from –40°C to +125°C junction temperature, including HTOL, TC, and ESD testing. |
| Integrated start-up regulator | 7 V, 27 mA current-limited VCC output enables direct 4.5–50 V input connection without external bias supply. |
| Thermal shutdown with hysteresis | Shuts down at 175°C (typ.), resumes at 155°C - prevents thermal runaway while allowing safe restart after cooling. |
Applications
| Automotive Infotainment Power Supply | ADAS Camera Module Bias Rail |
|---|---|
|
Use Scenario: Powering DSP, FPGA, and display interface ICs in head-unit systems with wide battery input variation (6–16 V nominal, 4.5–50 V transient). IC Role / Device Role / Timing Role: Primary POL regulator converting battery voltage to stable 3.3 V or 5 V for digital subsystems. Use Value: 2.6 MHz operation minimizes inductor size; PGD output synchronizes with MCU boot sequence; AEC-Q100 compliance ensures field reliability. |
Use Scenario: Generating clean 1.8 V or 2.8 V supply for CMOS image sensors and serializer ICs in rear-view or surround-view cameras. IC Role / Device Role / Timing Role: Secondary-side post-regulator downstream of a higher-voltage buck, providing low-noise, tightly regulated bias. Use Value: Ultra-low 10 µA shutdown current extends vehicle-off battery life; valley current limit protects against sensor short-circuit faults. |
| Telematics Control Unit (TCU) Core Rail | Industrial Vehicle Telematics Gateway |
|
Use Scenario: Supplying 1.2 V or 1.8 V to ARM Cortex-A/M series processors in LTE-connected telematics units exposed to engine bay temperatures. IC Role / Device Role / Timing Role: High-efficiency step-down regulator operating in continuous conduction mode at full load, with thermal shutdown protection. Use Value: Junction temperature rating up to +125°C and thermal hysteresis ensure uninterrupted operation during sustained high ambient conditions. |
Use Scenario: Providing isolated 5 V and 3.3 V rails for CAN FD transceivers, GPS modules, and cellular modems in heavy-duty truck telematics gateways. IC Role / Device Role / Timing Role: Input-stage buck converter handling 24 V nominal truck battery with cold-crank (down to 6 V) and load-dump (up to 65 V) immunity. Use Value: 50 V absolute max VIN and 65 V transient rating eliminate need for upstream TVS clamping in many designs; DSBGA package saves board area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM34919Q0QTL/NOPB | Same silicon, different RON resistor value pre-programmed internally - fixed 1.5 MHz switching frequency vs. adjustable via external RON. | Eliminates RON resistor but reduces design flexibility for EMI tuning or efficiency optimization across input range. | Select LM34919Q0QTL/NOPB only if fixed-frequency operation and simplified BOM outweigh need for VIN-dependent frequency stability. |
| TPS54340QDDARQ1 | Current-mode PWM controller with 42 V max VIN, 3.5 A output, external MOSFETs - differs in topology, higher current, no integrated switch. | Used where >600 mA is needed or where discrete FET selection is required for thermal or reliability reasons. | Choose TPS54340QDDARQ1 when scaling output current beyond 600 mA or requiring independent gate drive control; not drop-in compatible. |
Compared with LM34919Q0QTL/NOPB, the LM34919CQTL/NOPB offers programmable frequency via RON for optimized light-load efficiency and EMI spread-spectrum tuning, while TPS54340QDDARQ1 provides higher current capability at the cost of increased component count and layout complexity.
Availability
LM34919CQTL/NOPB is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and telematics control units requiring stable component supply with AEC-Q100 traceability and long-term production support.
Supply support for LM34919CQTL/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 deep expertise in automotive-grade reliability and functional safety.
The LM34919C product line delivers ultra-small, high-voltage buck regulators for automotive point-of-load applications where space, thermal performance, and AEC-Q100 compliance are critical design constraints.
FAQ
What is the maximum input voltage rating for the LM34919CQTL/NOPB?
The LM34919CQTL/NOPB has an absolute maximum VIN rating of 65 V, with recommended operating range from 4.5 V to 50 V. This allows direct connection to automotive battery systems including cold-crank and load-dump transients, provided external protection (e.g., TVS) is sized for worst-case clamping voltage.
Does the LM34919CQTL/NOPB require external compensation components?
No, the LM34919CQTL/NOPB uses a constant on-time control scheme that eliminates the need for external compensation networks. Its feedback loop is inherently stable across input and load variations, simplifying design and reducing bill-of-materials cost compared to traditional voltage-mode or current-mode controllers.
How is the switching frequency set on the LM34919CQTL/NOPB?
The switching frequency of the LM34919CQTL/NOPB is determined by the external resistor RON connected between VIN and the RON pin. The on-time tON is calculated as tON ≈ 35.5×10−12 × RON × VIN, resulting in nearly constant frequency across input voltage changes due to the inverse VIN relationship.
What is the function of the ISEN and SGND pins on the LM34919CQTL/NOPB?
The ISEN pin carries the recirculating inductor current during the off-time, while SGND provides the dedicated sense ground return path. Together they enable valley current limit detection at 0.64 A typical - a key protection feature that avoids foldback behavior and maintains predictable current limiting under short-circuit conditions.
Can the LM34919CQTL/NOPB operate without an external bootstrap capacitor?
No - the LM34919CQTL/NOPB requires a 0.022 µF capacitor between BST and SW pins to supply gate drive voltage for the integrated N-channel high-side switch. Omitting this capacitor will prevent proper switching operation and may cause immediate device failure due to insufficient gate voltage.
LM34919CQTL/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)
LM34919CQTL/NOPB FAQ
1.How can I place an order for LM34919CQTL/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34919CQTL/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 LM34919CQTL/NOPB reliable?
The price and inventory of LM34919CQTL/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34919CQTL/NOPB is usually 5 days.
3.What payment methods are accepted for LM34919CQTL/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34919CQTL/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34919CQTL/NOPB?
LM34919CQTL/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34919CQTL/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 LM34919CQTL/NOPB?
For technical support, including LM34919CQTL/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34919CQTL/NOPB requirements.
6.How does Aetrix verify that LM34919CQTL/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34919CQTL/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 LM34919CQTL/NOPB meets industry standards.
7.What is the process for return or replacement of LM34919CQTL/NOPB?
All LM34919CQTL/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34919CQTL/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 LM34919CQTL/NOPB part is unused and in its original packaging.
Return procedure for LM34919CQTL/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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