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Texas Instruments LM46000QPWPRQ1
- Part No.:
- LM46000QPWPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM46000QPWPRQ1.pdf
- Description:
- IC REG BUCK ADJ 500MA 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,000
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Product details
Overview
LM46000QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified synchronous step-down DC-DC converter delivering up to 0.5 A output current across a 3.5 V to 60 V input range, featuring 24 µA quiescent current in regulation, internal compensation, and 500 kHz default switching frequency. It integrates high-side and low-side MOSFETs (RDS(on) = 419 mΩ / 231 mΩ), supports soft-start into pre-biased loads, and provides power-good flag and precision enable for automotive sub-AM band 12 V/24 V systems.
For engineers reviewing the LM46000QPWPRQ1 datasheet, LM46000QPWPRQ1 pinout, LM46000QPWPRQ1 application, or LM46000QPWPRQ1 equivalent, key selection considerations include its wide VIN range, EN threshold programmability (2.1 V typical), PGOOD accuracy (±7% over temperature), EMI-tested compliance with EN55022 Class B, and HTSSOP-16 thermal pad layout requirements.
Technical Context
The LM46000QPWPRQ1 employs fixed-frequency peak current mode control with automatic transition to discontinuous conduction mode (DCM) and pulse frequency modulation (PFM) at light loads, enabling high efficiency down to 1 mA. Its internal compensation eliminates external loop components, while the RT pin allows resistor-programmable switching frequency from 200 kHz to 2.2 MHz.
Functional integration includes a precision enable comparator (2.1 V threshold, 305 mV hysteresis), internal soft-start (4.1 ms), tracking capability via SS/TRK pin, and hiccup-mode short-circuit protection triggered by valley current limit (0.6 A typ). Thermal shutdown activates at 160°C with 10°C hysteresis, and the device meets AEC-Q100 Grade 1 (–40°C to +125°C TJ) requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - Supports direct connection to automotive battery rails including cold-crank (6 V) and load-dump (60 V) transients. |
| Output Current | 0.5 A continuous - Sufficient for powering infotainment subsystems, ADAS sensors, and body control modules without external current boosting. |
| Quiescent Current | 24 µA in regulation - Enables always-on functionality in vehicle modules while meeting ISO 16750-2 sleep current requirements. |
| Switching Frequency | 500 kHz default (200 kHz–2.2 MHz adjustable) - Balances EMI performance and inductor size; 500 kHz allows compact 27 µH magnetics with <1 mm height. |
| Feedback Reference | 1.016 V ±12 mV (–40°C to +125°C) - Enables accurate 3.3 V, 5 V, or 12 V outputs using standard 1% resistors with <±1% total output error. |
| Power-Good Accuracy | ±7% over temperature - Provides reliable system sequencing and fault detection for microcontrollers requiring tight VOUT monitoring. |
| Thermal Resistance | RθJA = 39.9°C/W (4-layer board) - Requires minimum 200 mm² copper pour under thermal pad for full 0.5 A operation at 125°C ambient. |
Pinout & Package
LM46000QPWPRQ1 is housed in a 16-pin HTSSOP (PWP) package (6.6 mm × 5.1 mm × 1.2 mm, 0.65 mm pitch) with exposed thermal pad (PAD) connected internally to AGND and serving as primary heat dissipation path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2) | Switch node | Connects to inductor; carries high di/dt switching current - requires shortest possible trace to minimize EMI and voltage spikes. |
| CBOOT (3) | Bootstrap capacitor terminal | Supplies gate drive for high-side FET; requires 470 nF ceramic capacitor placed adjacent to pin with low-ESR path to SW. |
| VCC (4) | Internal LDO output | Bypass with 1–10 µF capacitor to AGND; no external load permitted - powers internal logic and gate drivers. |
| BIAS (5) | Optional LDO input | Tie to VOUT (if 3.3–28 V) or external rail to reduce power loss; floating or incorrect bias causes efficiency degradation. |
| SYNC (6) | External clock input | Accepts 200 kHz–2.2 MHz square wave; requires 50 Ω series termination to prevent ringing-induced false triggering. |
| RT (7) | Frequency programming | Resistor to AGND sets fSW; open circuit = 500 kHz; 100 kΩ yields ~2 MHz - tolerance directly impacts timing-critical applications. |
| PGOOD (8) | Open-drain status flag | Pulls low when VOUT deviates >7% from target; requires 10–100 kΩ pull-up to ≤12 V logic rail for proper MCU reset signaling. |
| FB (9) | Feedback sense input | High-impedance node (65 nA leakage); connects to resistor divider midpoint - sensitive to noise coupling and PCB leakage. |
| AGND (10) | Analog ground reference | Separate from PGND in layout; star-connected to FB, SS/TRK, and VCC bypass caps to avoid noise injection into control loop. |
| SS/TRK (11) | Soft-start/tracking control | Capacitor extends soft-start time linearly; external ramp enables power sequencing with other rails - critical for FPGA/CPU core logic. |
| EN (12) | Enable input | Logic-level compatible (0.4 V low, 1.2 V high); precision threshold (2.1 V) allows direct connection to battery-sensed undervoltage monitors. |
| VIN (13,14) | Main power input | Dual pins reduce IR drop and thermal stress; must connect to high-frequency CIN (≥10 µF X7R) with minimal loop area to PGND. |
| PGND (15,16) | Power ground return | Low-inductance path for high-side/low-side FET currents; ties to CIN, COUT, and thermal pad - forms main current return plane. |
| PAD | Exposed thermal pad | Internally connected to AGND; must be soldered to ≥200 mm² solid copper pour with ≥4 thermal vias to inner ground layers for thermal reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous FETs | Eliminates external MOSFETs and gate drivers - reduces BOM count by 4 components and saves >25 mm² PCB area versus discrete solutions. |
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C junction operation with lifetime testing per automotive standards - suitable for engine bay and under-hood placement. |
| EN pin precision UVLO | 2.1 V enable threshold with 305 mV hysteresis enables robust system-level brownout detection without external comparators or resistive dividers. |
| EMI-tested design | Meets EN55022 Class B radiated/conducted limits on standard EVM - reduces need for ferrite beads or metal shielding in cost-sensitive automotive modules. |
| Pre-biased soft-start | Allows safe startup into powered loads (e.g., hot-plugged peripherals) without reverse current flow or output voltage overshoot. |
| Internal compensation | Removes requirement for external Type II/III compensation network - simplifies design validation and eliminates tuning iterations during prototyping. |
Applications
| Automotive Sub-AM Band Power | Telecom Remote Radio Unit |
|---|---|
|
Use Scenario: Powering infotainment head units and digital cluster displays in 12 V/24 V vehicles, operating through cold-crank (6 V) and load-dump (60 V) events. IC Role / Device Role / Timing Role: Primary synchronous buck regulator providing stable 5 V or 3.3 V rail to SoC and display controllers. Use Value: 60 V max input withstands automotive transients; 24 µA IQ extends battery life in parked modes; PGOOD enables safe MCU wake-up sequencing. |
Use Scenario: Generating isolated 5 V/3.3 V supplies for remote radio unit (RRU) FPGAs and ADCs in harsh outdoor telecom cabinets. IC Role / Device Role / Timing Role: Point-of-load regulator converting 48 V backplane to low-voltage logic rails with precise enable control. Use Value: Wide VIN accommodates -48 V telecom nominal with ripple; SYNC pin allows clock alignment to baseband processor for deterministic EMI reduction. |
| Commercial Vehicle Telematics | Industrial IoT Gateway |
|
Use Scenario: Supplying GPS modules, cellular modems, and CAN transceivers in heavy-duty truck telematics units exposed to wide temperature swings. IC Role / Device Role / Timing Role: Main DC-DC converter delivering regulated 3.3 V to wireless communication ICs with hiccup-mode fault recovery. Use Value: AEC-Q100 qualification ensures reliability at 125°C junction; SS/TRK pin enables synchronized startup with modem power-up sequence. |
Use Scenario: Powering ARM-based edge AI processors and sensor fusion hubs in factory automation gateways with 24 V industrial bus input. IC Role / Device Role / Timing Role: High-efficiency buck converter supporting dynamic voltage scaling for variable workload processors. Use Value: DCM/PFM light-load operation maintains >85% efficiency at 1 mA; RT pin allows frequency optimization to avoid noise-sensitive 2.4 GHz ISM band. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM46001QPWPRQ1 | 1 A output current, identical pinout and feature set, higher RDS(on) (450 mΩ HS / 250 mΩ LS) | Required where sustained >0.5 A load current or higher thermal margin is needed without changing PCB layout | Select when future-proofing for higher current or derating for extended lifetime at elevated ambient temperatures |
| LM43603QPWPRQ1 | 3.5–36 V input range, 3 A output, same HTSSOP-16 package but different pin mapping (no BIAS pin, different EN threshold) | Suitable for lower-VIN industrial applications needing higher current, but not drop-in replaceable due to pinout and EN logic differences | Choose only if redesigning for 36 V max input and 3 A capability; requires full schematic and layout revision |
Compared with LM46000QPWPRQ1, the LM46001QPWPRQ1 offers higher current headroom in identical footprint, while the LM43603QPWPRQ1 trades input voltage range and current capability for incompatible pin functions - making the former a true upgrade path and the latter a system-level redesign candidate.
Availability
LM46000QPWPRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, commercial vehicle telematics, and industrial IoT gateway designs requiring stable component supply with AEC-Q100 qualification, wide input voltage tolerance, and low quiescent current.
Supply support for LM46000QPWPRQ1 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 and embedded processing technologies, with deep expertise in automotive-grade power management ICs and rigorous AEC-Q100 qualification processes.
The LM46000-Q1 product line delivers highly integrated synchronous buck regulators optimized for automotive subsystems requiring wide VIN, low IQ, and robust EMI performance - targeting infotainment, ADAS, and body electronics applications.
FAQ
What is the maximum input voltage rating for LM46000QPWPRQ1?
The LM46000QPWPRQ1 has an absolute maximum input voltage rating of 65 V and a recommended operating maximum of 60 V. This allows it to safely withstand automotive load-dump transients defined in ISO 16750-2 (up to +75 V for 400 ms), provided appropriate input filtering and clamping are implemented per TI's application guidelines. The device remains functional across its full 3.5 V to 60 V input range.
Does LM46000QPWPRQ1 support synchronization to an external clock?
Yes, LM46000QPWPRQ1 supports frequency synchronization via the SYNC pin, accepting external clock signals from 200 kHz to 2.2 MHz with TTL-compatible thresholds (0.4 V low, 2 V high). Proper 50 Ω series termination is required to suppress ringing, and the external clock duty cycle must remain between 10% and 90% to ensure reliable operation. This feature enables EMI reduction through clock dithering or alignment with system master clocks.
How does the BIAS pin improve efficiency in LM46000QPWPRQ1?
The BIAS pin on LM46000QPWPRQ1 allows connection to VOUT (for 3.3–28 V outputs) or an external 3.3 V/5 V rail, reducing power loss in the internal VCC LDO. When used, it lowers operating quiescent current from 24 µA (VIN-powered) to 85–140 µA (BIAS-powered), improving light-load efficiency by up to 5 percentage points. Incorrect BIAS connection (e.g., floating or below 3.3 V) degrades performance and must be avoided.
What thermal design considerations apply to LM46000QPWPRQ1?
LM46000QPWPRQ1 requires the exposed thermal pad (PAD) to be soldered to a minimum 200 mm² copper pour connected via ≥4 thermal vias to inner ground planes. With RθJA = 39.9°C/W on a 4-layer board, full 0.5 A output at 125°C ambient demands this layout to maintain junction temperature below 160°C shutdown threshold. Insufficient copper area or missing vias cause thermal throttling and reduced output current capability.
Can LM46000QPWPRQ1 start up into a pre-biased output?
Yes, LM46000QPWPRQ1 supports soft-start into pre-biased loads via its internal circuitry - preventing reverse current flow and output voltage overshoot when the output capacitor is already charged. This capability is enabled by default and requires no external components. It is essential for hot-swap applications such as modular automotive ECUs or field-replaceable telecom cards where the downstream rail may be live during insertion.
LM46000QPWPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Not For New Designs
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3.5V
- Voltage - Input (Max):
- 60V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 500mA
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM46000QPWPRQ1 FAQ
1.How can I place an order for LM46000QPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM46000QPWPRQ1 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 LM46000QPWPRQ1 reliable?
The price and inventory of LM46000QPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM46000QPWPRQ1 is usually 5 days.
3.What payment methods are accepted for LM46000QPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM46000QPWPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM46000QPWPRQ1?
LM46000QPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM46000QPWPRQ1 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 LM46000QPWPRQ1?
For technical support, including LM46000QPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM46000QPWPRQ1 requirements.
6.How does Aetrix verify that LM46000QPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM46000QPWPRQ1 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 LM46000QPWPRQ1 meets industry standards.
7.What is the process for return or replacement of LM46000QPWPRQ1?
All LM46000QPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM46000QPWPRQ1, 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 LM46000QPWPRQ1 part is unused and in its original packaging.
Return procedure for LM46000QPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM46000QPWPRQ1 Tags
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