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Texas Instruments LM46000AQPWPRQ1
- Part No.:
- LM46000AQPWPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM46000AQPWPRQ1.pdf
- Description:
- IC REG BUCK ADJ 500MA 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,767
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Product details
Overview
LM46000AQPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-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 enables compact, high-efficiency power conversion in vehicle sub-AM band systems with integrated PFM/DCM light-load operation and soft-start into pre-biased loads.
For engineers reviewing the LM46000AQPWPRQ1 datasheet, LM46000AQPWPRQ1 pinout, LM46000AQPWPRQ1 application, or LM46000AQPWPRQ1 equivalent, key selection considerations include its wide VIN range, precision enable threshold (2.1 V typical), PGOOD flag with 6% hysteresis, and HTSSOP-16 thermal pad package optimized for automotive thermal and EMI requirements per EN55022 Class B.
Technical Context
The LM46000AQPWPRQ1 uses peak current mode control with fixed-frequency PWM, supporting discontinuous conduction mode (DCM) and pulse frequency modulation (PFM) at light loads to maintain high efficiency down to microampere loads. Its internal compensation eliminates external loop components while enabling stable operation with ceramic, polymer, tantalum, or aluminum output capacitors.
It integrates both high-side (419 mΩ RDS(on)) and low-side (231 mΩ RDS(on)) MOSFETs, supports frequency synchronization from 200 kHz to 2.2 MHz via SYNC pin, and provides programmable soft-start via SS/TRK pin with 4.1 ms internal ramp and external capacitor extension capability.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - supports direct connection to 12 V/24 V/48 V automotive battery rails including cold-crank and load-dump transients. |
| Output Current | 0.5 A continuous - sufficient for powering infotainment SoCs, ADAS sensors, and CAN transceivers without external boost stages. |
| Quiescent Current | 24 µA in regulation - enables always-on functionality in vehicle body control modules with minimal battery drain. |
| Switching Frequency | 200 kHz to 2.2 MHz adjustable via RT pin; 500 kHz default - allows layout optimization for EMI suppression or inductor size reduction. |
| Feedback Reference | 1.016 V ±10 mV over temperature - enables accurate output voltage setting from 1 V to 28 V using standard resistor dividers. |
| Power-Good Flag | Open-drain PGOOD with 113% overvoltage / 90% undervoltage thresholds and 6% hysteresis - provides reliable system power sequencing and fault detection. |
| Thermal Protection | 160 °C shutdown with 150 °C recovery - ensures safe operation under sustained overload or poor heatsinking in enclosed automotive enclosures. |
Pinout & Package
LM46000AQPWPRQ1 is housed in a thermally enhanced 16-pin HTSSOP (PWP) package (6.6 mm × 5.1 mm × 1.2 mm, 0.65 mm pitch) with exposed thermal pad (PAD) tied internally to AGND and requiring PCB copper pour for effective heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2) | Switch node | Connects to inductor; carries high di/dt switching current; requires short, low-inductance trace to minimize EMI and voltage spikes. |
| CBOOT (3) | Bootstrap supply | Provides gate drive voltage for high-side FET; requires 470 nF ceramic capacitor between CBOOT and SW. |
| VCC (4) | Internal LDO output | Bypassed to AGND with 1–10 µF capacitor; powers internal circuitry; must not be loaded externally. |
| BIAS (5) | LDO input select | Connected to VOUT (3.3–28 V) or external rail to improve efficiency; tied to GND if VOUT < 3.3 V. |
| SYNC (6) | Frequency sync input | Accepts external clock (200 kHz–2.2 MHz); requires proper high-speed termination to prevent ringing. |
| RT (7) | Frequency programming | Resistor to AGND sets switching frequency; open circuit defaults to 500 kHz. |
| PGOOD (8) | Power-good indicator | Open-drain output pulled up externally; asserts when FB is within ±13% of target; used for system enable sequencing. |
| FB (9) | Feedback sense | Monitors output via resistor divider; regulates VOUT = 1.016 V × (1 + RFBT/RFBB). |
| AGND (10) | Analog ground | Reference for internal references and feedback; must connect directly to low-noise system ground plane. |
| SS/TRK (11) | Soft-start / tracking | Controls startup slew rate; external capacitor extends soft-start time; voltage ramp enables output tracking. |
| EN (12) | Enable input | Logic-level control (2.1 V typical threshold); supports precision UVLO programming for system-level brownout protection. |
| VIN (13,14) | Main input supply | High-current path for input power; requires local high-frequency bypass capacitor near pins 13/14 and PGND. |
| PGND (15,16) | Power ground | Low-side FET source return; connects to CIN/COUT grounds and thermal pad; must be low-impedance path. |
| PAD | Thermal pad | Internally connected to AGND; primary heat dissipation path; must be soldered to large PCB copper area. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C TJ) - certified for engine bay and cabin electronics with full reliability testing. |
| Integrated synchronous FETs | 419 mΩ HS / 231 mΩ LS RDS(on) - eliminates external MOSFETs and drivers, reducing BOM count and layout complexity. |
| EMI-compliant design | Tested to EN55022/CISPR 22 Class B radiated/conducted emissions - meets automotive EMC requirements without added filtering. |
| Light-load efficiency mode | Automatic transition to DCM and PFM - maintains >85% efficiency at 1 mA load, critical for always-on vehicle modules. |
| Robust protection suite | Cycle-by-cycle current limit, hiccup-mode short-circuit protection, thermal shutdown, and VCC UVLO - prevents damage during fault conditions without latch-up. |
| Flexible startup control | Internal 4.1 ms soft-start + external capacitor extension + output voltage tracking - prevents inrush current and enables coordinated multi-rail power-up. |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
|
Use Scenario: Powers display controller, audio codec, and USB hub in automotive head unit with 12 V battery input. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 3.3 V/5 V rails with PGOOD sequencing and low-noise operation. Use Value: 24 µA quiescent current minimizes standby drain; EN pin enables ignition-synchronized wake/sleep; PGOOD confirms rail readiness before MCU boot. |
Use Scenario: Supplies image sensor, ISP, and serializer in rear-view or surround-view camera with harsh thermal environment. IC Role / Device Role / Timing Role: High-reliability point-of-load converter delivering 1.8 V/3.3 V with thermal shutdown and input transient tolerance. Use Value: 160 °C thermal shutdown protects silicon under sealed housing; 60 V max input withstands load dump; HTSSOP thermal pad dissipates heat without heatsink. |
| Telematics Control Unit | Commercial Vehicle Telematics |
|
Use Scenario: Regulates power for LTE modem, GNSS receiver, and CAN interface in fleet management gateway. IC Role / Device Role / Timing Role: Wide-VIN buck converter with SYNC input for EMI reduction in RF-sensitive environments. Use Value: 200–2200 kHz frequency adjust enables spread-spectrum-like noise shaping; SYNC pin allows alignment with baseband clock to avoid beat frequencies. |
Use Scenario: Powers telematics module in heavy-duty truck with 24 V nominal but frequent 36–40 V alternator transients. IC Role / Device Role / Timing Role: Input-tolerant step-down regulator supporting extended battery voltage range and long-term reliability. Use Value: 60 V absolute max input rating handles alternator overshoot; AEC-Q100 qualification ensures 15-year field life; EN pin supports remote wake-up via CAN bus. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM46001QPWPRQ1 | 1-A output current, identical pinout and feature set, same HTSSOP-16 package | Required where higher load current (e.g., dual-core MCU + wireless) exceeds 0.5 A capability of LM46000AQPWPRQ1 | Select when system load exceeds 0.5 A but board space and thermal constraints permit same footprint. |
| LM43603QPWPRQ1 | 3.5–36 V input range, 3-A output, HTSSOP-16 pin-compatible, no BIAS pin | Suitable for higher-power domains (e.g., radar processor core) but lacks 60 V input tolerance and PFM optimization | Choose only if input stays below 36 V and 3-A output is required; not drop-in due to missing BIAS functionality and reduced VIN range. |
Compared with LM46000AQPWPRQ1, LM46001QPWPRQ1 offers scalable current capacity in identical form factor, while LM43603QPWPRQ1 trades input voltage range and light-load efficiency for higher output current-making LM46000AQPWPRQ1 optimal for cost- and space-constrained 0.5-A automotive subsystems.
Availability
LM46000AQPWPRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, telematics control units, and commercial vehicle power supplies requiring stable component supply with AEC-Q100 compliance and long-term production support.
Supply support for LM46000AQPWPRQ1 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 functional safety design.
The LM46000-Q1 product line delivers wide-input, high-efficiency synchronous buck regulators specifically engineered for automotive subsystems demanding AEC-Q100 qualification, low quiescent current, and robust EMI performance in constrained spaces.
FAQ
What is the maximum input voltage rating for the LM46000AQPWPRQ1?
The LM46000AQPWPRQ1 has an absolute maximum input voltage rating of 65 V and a recommended operating maximum of 60 V. This allows it to safely handle automotive load-dump transients up to ISO 7637-2 Pulse 5a (60 V, 100 ms) without external clamping, making it suitable for direct battery connection in 24 V commercial vehicle systems. The LM46000AQPWPRQ1 maintains regulation down to 3.5 V, covering cold-crank scenarios.
Does the LM46000AQPWPRQ1 support output voltage tracking?
Yes, the LM46000AQPWPRQ1 supports output voltage tracking via the SS/TRK pin. When an external voltage ramp is applied to this pin, the FB reference follows proportionally, enabling coordinated power-up of multiple rails. This function is confirmed in the datasheet's Feature Description section and is implemented in the LM46000AQPWPRQ1's internal slope compensation and error amplifier architecture.
How does the LM46000AQPWPRQ1 achieve low EMI performance?
The LM46000AQPWPRQ1 achieves low EMI through integrated features including adjustable switching frequency (200 kHz–2.2 MHz), precise edge rate control on SW node, and optimized internal gate drivers. It has been tested to meet EN55022/CISPR 22 Class B radiated and conducted emission limits on standard evaluation boards without additional filtering, as shown in Figures 21–24 of the LM46000-Q1 datasheet.
What is the purpose of the BIAS pin on the LM46000AQPWPRQ1?
The BIAS pin on the LM46000AQPWPRQ1 provides an optional input to the internal LDO, improving conversion efficiency when tied to VOUT (for 3.3 V ≤ VOUT ≤ 28 V) or an external 3.3 V/5 V rail. When used, a 1–10 µF bypass capacitor is required. If unused (e.g., VOUT < 3.3 V), the BIAS pin must be tied to ground-not left floating-to ensure proper biasing of internal circuitry.
Is the LM46000AQPWPRQ1 pin-compatible with other devices in the LM4600x family?
Yes, the LM46000AQPWPRQ1 is pin-to-pin compatible with the LM46000-Q1, LM46001-Q1, and LM46002-Q1 in the HTSSOP-16 (PWP) package. This allows seamless current-scaling upgrades (0.5 A → 1 A → 2 A) without PCB redesign. However, the LM46000AQPWPRQ1 variant is specifically optimized for PFM operation and is recommended for new designs requiring best-in-class light-load efficiency.
LM46000AQPWPRQ1 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:
- Active
- 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
LM46000AQPWPRQ1 FAQ
1.How can I place an order for LM46000AQPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM46000AQPWPRQ1 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 LM46000AQPWPRQ1 reliable?
The price and inventory of LM46000AQPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM46000AQPWPRQ1 is usually 5 days.
3.What payment methods are accepted for LM46000AQPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM46000AQPWPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM46000AQPWPRQ1?
LM46000AQPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM46000AQPWPRQ1 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 LM46000AQPWPRQ1?
For technical support, including LM46000AQPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM46000AQPWPRQ1 requirements.
6.How does Aetrix verify that LM46000AQPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM46000AQPWPRQ1 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 LM46000AQPWPRQ1 meets industry standards.
7.What is the process for return or replacement of LM46000AQPWPRQ1?
All LM46000AQPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM46000AQPWPRQ1, 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 LM46000AQPWPRQ1 part is unused and in its original packaging.
Return procedure for LM46000AQPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM46000AQPWPRQ1 Tags
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