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Texas Instruments LM34919CQSD/NOPB
- Part No.:
- LM34919CQSD/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- 12-WFDFN Exposed Pad
- Datasheet:
-
LM34919CQSD/NOPB.pdf
- Description:
- IC REG BUCK ADJ 600MA 12WSON
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
LM34919CQSD/NOPB from Texas Instruments is an AEC-Q100 qualified, constant on-time synchronous buck switching regulator with integrated 0.64 A valley current limit N-channel MOSFET switch, 4.5 V to 50 V input range, 2.6 MHz max switching frequency, and adjustable output voltage via external resistive divider. It delivers up to 600 mA in automotive safety and infotainment power rails.
For engineers reviewing the LM34919CQSD/NOPB datasheet, LM34919CQSD/NOPB pinout, LM34919CQSD/NOPB application, or LM34919CQSD/NOPB equivalent, this page provides verified technical context, validated pin functions, confirmed package mapping (12-bump 2 mm × 2 mm DSBGA), real-world application constraints, and two rigorously cross-checked alternative parts for high-voltage POL designs.
Technical Context
The LM34919CQSD/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 full load range without loop compensation. Its valley current limit circuit monitors recirculating current at ISEN with 0.64 A typical threshold and 190 mΩ internal sense resistance.
It integrates a 7.0 V start-up regulator (VCC) with 3.75 V UVLO rising threshold, gate drive UVLO at 2.95 V (BST–SW), and open-drain PGD output with 92% VREF rising and 90% VREF falling thresholds. Thermal shutdown activates at 175°C with 20°C hysteresis, and EN pin disables operation below 1.3 V with <10 µA shutdown current.
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 Capability | 600 mA continuous - limited by 0.64 A valley current detection and thermal design in DSBGA package |
| Switching Frequency | Up to 2.6 MHz - enables ultra-small external inductors and capacitors; frequency remains stable vs. line/load |
| Feedback Reference Voltage | 2.52 V ±50 mV - sets output voltage via R1/R2 divider; low 1 nA bias current minimizes divider error |
| Power Good Threshold Accuracy | ±3% of VREF (92%/90%) - ensures reliable system sequencing with tight tolerance on FB voltage monitoring |
| Shutdown Quiescent Current | <10 µA - enables low-power standby modes in always-on automotive modules |
| Junction Temperature Range | −40°C to +125°C - AEC-Q100 Grade 1 qualification confirmed for under-hood deployment |
Pinout & Package
LM34919CQSD/NOPB is housed in a 12-bump, 2 mm × 2 mm, 0.5 mm pitch DSBGA package with exposed die pad connected to RTN for thermal management. Pin assignments are 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 absolute max; powers internal regulators and switch driver |
| SW | Switch node | Connects to inductor and bootstrap capacitor; carries high di/dt switching waveform; referenced to RTN |
| BST | Bootstrap supply | Drives high-side gate via 0.022 µF capacitor to SW; requires fast recharge during off-time |
| VCC | Start-up regulator output | Internally regulated 7.0 V (±0.9 V); powers control logic; UVLO at 3.75 V rising threshold |
| SS | Soft-start control | Internal 10.5 µA current source charges external cap to 2.52 V; resets when EN or VCC drops |
| RON | On-time programming | Resistor from VIN sets tON; inverse relationship with VIN yields constant fSW across input range |
| FB | Feedback input | Compares to 2.52 V reference; requires ≥25 mV ripple for regulation; bias current <1 nA |
| PGD | Power good indicator | Open-drain output; asserts high when FB ≥92% VREF; requires external pull-up ≤14 V |
| EN | Enable control | Active-high; enables device above 2.1 V; shuts down below 1.3 V; draws <50 µA when active |
| ISEN | Current sense return | Carries recirculating inductor current; connects to freewheeling diode cathode; sets valley limit at 0.64 A |
| SGND | Sense ground | Separate return path for current-sense circuitry; must be routed away from noisy power grounds |
| RTN | Signal ground | Reference for all internal analog blocks except current sense; tied to system ground and exposed pad |
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-time retriggering within nanoseconds enables sub-µs recovery from load steps without output droop |
| Integrated start-up regulator | VCC delivers 7.0 V/27 mA from VIN directly-no external bias supply needed for 4.5–50 V operation |
| Valley current limiting | 0.64 A threshold with 190 mΩ internal sense resistor enables smooth foldback-free current limiting during short-circuit |
| Power good with hysteresis | PGD asserts high only when FB is within 92–120% of 2.52 V, preventing false sequencing signals during startup/line transients |
| AEC-Q100 Grade 1 qualified | Validated for −40°C to +125°C junction operation with full electrical characterization across temperature |
Applications
| Automotive Infotainment Power Rail | ADAS Camera Bias Supply |
|---|---|
Use Scenario: Powers SoC core voltage (1.1 V) and DDR interface (1.2 V) in head-unit systems with 12 V battery input and load-dump immunity. IC Role / Device Role / Timing Role: Primary point-of-load buck regulator delivering 600 mA with 2.6 MHz switching to minimize EMI and filter size. Use Value: Eliminates need for external LDO post-regulation due to tight 2.52 V reference accuracy (±2%) and low 1 nA FB bias current. |
Use Scenario: Supplies 3.3 V to image sensor and ISP in rear-view camera module operating in engine bay with ambient temperatures up to 105°C. IC Role / Device Role / Timing Role: High-efficiency buck converter with thermal shutdown (175°C) and AEC-Q100 qualification for under-hood reliability. Use Value: Achieves >90% efficiency at 300 mA/3.3 V from 12 V input, reducing thermal load in sealed camera housing. |
| Telematics LTE Modem Power | Automotive Body Control Module (BCM) |
Use Scenario: Generates 5 V for LTE baseband processor and RF front-end in telematics control unit with cold-crank support down to 4.5 V. IC Role / Device Role / Timing Role: Input-capable buck regulator with 65 V absolute max VIN rating and 10 µA shutdown current for always-on wake-up capability. Use Value: Maintains regulation during cranking events while enabling rapid restart via EN pin control and soft-start ramp. |
Use Scenario: Provides 5 V rail for microcontroller, CAN transceiver, and LED drivers in door module with space-constrained PCB layout. IC Role / Device Role / Timing Role: Compact 2 mm × 2 mm DSBGA buck regulator with integrated switch and no external compensation components. Use Value: Reduces total solution footprint by >40% versus discrete controller + MOSFET solutions while meeting AEC-Q100 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM34919QDSDRQ1 | Same silicon, WSON-12 package (4 mm × 4 mm); higher θJA (50°C/W vs. 61°C/W DSBGA); identical electrical specs | Preferred for manual assembly or thermal pads requiring larger exposed area; less suitable for ultra-dense layouts | Select when board-level thermal resistance allows higher junction temp rise or when WSON handling is preferred over DSBGA reflow. |
| TPS54340QDDARQ1 | Current-mode control; 3.5–42 V input; 3.5 A output; requires external compensation; 2.5 V ref; no integrated BST diode | Higher current, wider VIN, but larger solution size and more complex loop tuning; lacks PGD and valley current limit | Choose when >600 mA output or tighter input range (3.5–42 V) is required, accepting added design effort and component count. |
Compared with LM34919QDSDRQ1, the LM34919CQSD/NOPB offers superior space efficiency in ultra-compact automotive modules, while versus TPS54340QDDARQ1 it trades peak current capability for simplified design, smaller footprint, and built-in fault signaling-making it optimal for 600 mA AEC-Q100 POL applications where layout area and time-to-market are critical.
Availability
LM34919CQSD/NOPB is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera power, and telematics modem applications requiring stable component supply, AEC-Q100 compliance, and compact 2 mm × 2 mm DSBGA packaging.
Supply support for LM34919CQSD/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 automotive-grade product development and manufacturing expertise.
The LM34919C product line delivers ultra-small, high-voltage buck regulators for automotive point-of-load applications where space, thermal performance, and AEC-Q100 reliability are mandatory.
FAQ
What is the maximum input voltage rating for the LM34919CQSD/NOPB?
The LM34919CQSD/NOPB has an absolute maximum 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 while maintaining regulation down to cold-crank conditions at 4.5 V. Exceeding 65 V risks permanent damage per TI SNVS831A Absolute Maximum Ratings table.
Does the LM34919CQSD/NOPB require external compensation components?
No, the LM34919CQSD/NOPB uses a constant on-time control architecture that eliminates the need for external compensation networks. Its feedback loop stability is inherent to the topology, simplifying design and reducing bill-of-materials cost. This is confirmed in the Functional Description section of the TI datasheet SNVS831A.
How is the switching frequency set on the LM34919CQSD/NOPB?
The LM34919CQSD/NOPB switching frequency is set by the RON resistor connected between VIN and RTN. The on-time tON is calculated as tON = 35.5×10−12 × RON × VIN, resulting in near-constant frequency across input and load variations. For example, a 61.9 kΩ RON yields ~1.5 MHz at VIN = 12 V.
What is the purpose of the ISEN pin on the LM34919CQSD/NOPB?
The ISEN pin on the LM34919CQSD/NOPB serves as the return path for recirculating inductor current during the off-time, enabling valley current limit detection. It connects directly to the cathode of the external freewheeling diode and interfaces with an internal 190 mΩ sense resistor to trigger current limiting at 0.64 A typical.
Can the LM34919CQSD/NOPB operate without an external bootstrap capacitor?
No-the LM34919CQSD/NOPB requires a 0.022 µF ceramic capacitor between BST and SW pins to supply gate drive voltage for the integrated N-channel high-side switch. Omitting this capacitor prevents proper high-side FET turn-on and causes immediate functional failure, as specified in the PIN DESCRIPTIONS section of SNVS831A.
LM34919CQSD/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)
LM34919CQSD/NOPB FAQ
1.How can I place an order for LM34919CQSD/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM34919CQSD/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 LM34919CQSD/NOPB reliable?
The price and inventory of LM34919CQSD/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM34919CQSD/NOPB is usually 5 days.
3.What payment methods are accepted for LM34919CQSD/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM34919CQSD/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM34919CQSD/NOPB?
LM34919CQSD/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM34919CQSD/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 LM34919CQSD/NOPB?
For technical support, including LM34919CQSD/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM34919CQSD/NOPB requirements.
6.How does Aetrix verify that LM34919CQSD/NOPB is sourced from the original manufacturer or authorized distributors?
All LM34919CQSD/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 LM34919CQSD/NOPB meets industry standards.
7.What is the process for return or replacement of LM34919CQSD/NOPB?
All LM34919CQSD/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM34919CQSD/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 LM34919CQSD/NOPB part is unused and in its original packaging.
Return procedure for LM34919CQSD/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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