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Texas Instruments LM46000AQPWPTQ1
- Part No.:
- LM46000AQPWPTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM46000AQPWPTQ1.pdf
- Description:
- IC REG BUCK ADJ 500MA 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,354
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Product details
Overview
LM46000AQPWPTQ1 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 serves as a compact, high-efficiency power supply for 12 V/24 V automotive subsystems requiring stable low-noise regulation under wide VIN transients.
For engineers reviewing the LM46000AQPWPTQ1 datasheet, LM46000AQPWPTQ1 pinout, LM46000AQPWPTQ1 application, or LM46000AQPWPTQ1 equivalent, key selection considerations include its PFM-optimized light-load efficiency, precision enable threshold (2.1 V ±30 mV), integrated power-good flag with 6% hysteresis, and HTSSOP-16 thermal pad package supporting automotive thermal cycling requirements.
Technical Context
The LM46000AQPWPTQ1 employs peak current mode control with automatic transition between continuous conduction mode (CCM) and discontinuous conduction mode (DCM), enabling stable operation down to zero load while maintaining <±1.5% output voltage accuracy over temperature. Its internal LDO supplies VCC at 3.3 V and supports optional BIAS pin connection to VOUT (3.3–28 V) for improved efficiency.
EMI performance is validated per EN55022 Class B with radiated emissions measured on evaluation board, and the device integrates cycle-by-cycle current limiting, hiccup-mode short-circuit protection, and thermal shutdown at 160°C. The 16-pin HTSSOP package features dual PGND and VIN pins plus exposed thermal pad for enhanced thermal dissipation in constrained automotive layouts.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - Supports full automotive battery range including cold-crank (6 V) and load-dump (60 V) events without external protection. |
| Output Current | 0.5 A - Sufficient for powering infotainment SoCs, ADAS sensors, or CAN transceivers from single-stage conversion. |
| Quiescent Current | 24 µA in regulation - Enables always-on systems (e.g., telematics wake-up circuitry) to meet <100 µA system sleep budgets. |
| Switching Frequency | 200 kHz to 2.2 MHz (500 kHz default) - Adjustable via RT resistor; higher frequencies allow smaller inductors and reduced PCB area. |
| Feedback Reference | 1.016 V ±10 mV - High-accuracy reference enables precise output setting (e.g., 3.3 V ±1%) with standard 1% resistors. |
| Power-Good Flag | Open-drain PGOOD with 113% OV / 90% UV thresholds and 6% hysteresis - Provides reliable rail monitoring for microcontroller reset sequencing. |
| Thermal Shutdown | 160°C shutdown / 150°C recovery - Protects against sustained overload or poor heatsinking in enclosed automotive enclosures. |
Pinout & Package
LM46000AQPWPTQ1 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 connected internally to AGND. The layout-optimized pin arrangement separates power and analog grounds, minimizes high-di/dt loop area, and places SW, PGND, and VIN pins adjacent for optimal inductor placement.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1, 2) | Switch node | Connects to inductor; carries high-frequency AC current; requires shortest possible trace to minimize EMI and losses. |
| CBOOT (3) | Bootstrap capacitor terminal | Supplies gate drive for high-side MOSFET; requires 470 nF ceramic capacitor directly between CBOOT and SW. |
| VCC (4) | Internal LDO output | Bypassed to AGND with 1–10 µF capacitor; powers internal circuitry; no external load permitted. |
| BIAS (5) | Optional LDO input | Connected to VOUT (3.3–28 V) or external 3.3/5 V rail to reduce power loss; tied to GND if unused (VOUT < 3.3 V). |
| SYNC (6) | External clock input | Accepts 200 kHz–2.2 MHz square wave; enables synchronization to system clock for EMI reduction; grounded if unused. |
| RT (7) | Frequency programming | Resistor to AGND sets switching frequency; open circuit = 500 kHz default; 1% tolerance recommended. |
| PGOOD (8) | Power-good indicator | Open-drain output pulled up externally (10–100 kΩ); asserts after soft-start and remains active within ±7% of target VOUT. |
| FB (9) | Feedback sense input | Monitors resistor divider output; internal 1.016 V reference sets VOUT = 1.016 × (1 + RFBT/RFBB); never shorted to ground. |
| AGND (10) | Analog ground reference | Reference for FB, SS/TRK, EN, SYNC, RT; connected to system ground plane with low-impedance path. |
| SS/TRK (11) | Soft-start / tracking control | Internal 4.1 ms soft-start when floating; extended by external capacitor; accepts external ramp for voltage tracking. |
| EN (12) | Enable input | Logic-level control: >2.1 V enables regulator; <1.2 V disables; hysteresis prevents chatter near threshold. |
| VIN (13, 14) | Main input supply | Dual pins reduce IR drop and improve thermal performance; connect directly to bulk capacitor with minimal trace length. |
| PGND (15, 16) | Power ground return | Low-side FET source connection; tied to AGND, PAD, and CIN/COUT grounds; forms critical high-current return path. |
| PAD | Thermal pad | Internally connected to AGND; must be soldered to large PCB copper pour for thermal management and EMI shielding. |
Key Features
| Feature | Design Value |
|---|---|
| PFM-optimized light-load operation | Enables >85% efficiency at 1 mA load (VIN = 24 V, VOUT = 3.3 V), critical for automotive standby modes. |
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces solution size and improves full-load efficiency by ~5% vs. asynchronous designs. |
| Stable with diverse output capacitors | Works with ceramic, polymer, tantalum, or aluminum electrolytic capacitors - simplifies BOM and mitigates supply chain risk. |
| Pre-biased soft-start | Allows safe startup into pre-charged outputs (e.g., hot-swap systems) without reverse current or output overshoot. |
| Output voltage tracking | SS/TRK pin accepts external voltage ramp to coordinate power-up sequencing with other rails in multi-rail systems. |
| EMI-tested design | Validated to EN55022 Class B radiated/conducted emissions limits using standard EVM layout - reduces pre-compliance debug time. |
Applications
| Infotainment Power Supply | ADAS Camera Module |
|---|---|
|
Use Scenario: Powers DSP, display controller, and USB PHY in automotive head unit with 12 V battery input subject to cranking dips and load-dump surges. IC Role / Device Role / Timing Role: Primary buck regulator providing clean, regulated 3.3 V/1.8 V rails with fast transient response and hiccup-mode fault containment. Use Value: 3.5–60 V input range eliminates need for upstream pre-regulator; 24 µA IQ extends battery life during vehicle-off state. |
Use Scenario: Supplies image sensor, ISP, and MIPI interface in rear-view or surround-view camera with strict EMI limits for EMC compliance. IC Role / Device Role / Timing Role: Point-of-load converter synchronized to system clock to shift switching noise away from video band. Use Value: EN55022 Class B validation and SYNC capability reduce radiated emissions by >10 dB in 30–1000 MHz band. |
| Telematics Control Unit | Commercial Vehicle Telematics |
|
Use Scenario: Powers LTE modem, GNSS receiver, and MCU in cellular-connected TCU operating across -40°C to +125°C ambient. IC Role / Device Role / Timing Role: AEC-Q100 Grade 1 qualified DC-DC converter delivering 0.5 A with thermal shutdown and precision enable for controlled wake-up. Use Value: 160°C thermal shutdown and 2.1 V precision enable ensure reliable operation in sealed, unventilated enclosures. |
Use Scenario: Regulates 24 V truck/bus battery to 5 V for GPS tracker, CAN gateway, and remote diagnostics module. IC Role / Device Role / Timing Role: Wide-VIN buck converter with robust input protection and hiccup-mode short-circuit response for harsh commercial vehicle environments. Use Value: 60 V absolute max input withstands 24 V system load-dump transients; dual VIN/PGND pins lower thermal resistance by 30%. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM46002AQPWPTQ1 | 1-A output current, identical pinout and feature set; higher RDS(on) (HS: 470 mΩ, LS: 250 mΩ) due to larger die. | Required where >0.5 A load current or higher thermal margin is needed; same PCB layout but higher peak efficiency at >300 mA. | Select when future-proofing for higher current or when derating for extended lifetime in high-temperature cabins. |
| LM43603QPWPTQ1 | 3-A output, HTSSOP-20 package; different pinout (no BIAS pin); fixed 500 kHz frequency; no PFM mode. | Suitable for higher-power domains (e.g., domain controllers); lacks light-load efficiency optimization and BIAS flexibility. | Choose only when 3-A capacity is required and EMI/efficiency at light load is secondary to peak power delivery. |
Compared with LM46000AQPWPTQ1, the LM46002AQPWPTQ1 offers direct pin-compatible scalability to 1 A with identical footprint and control features, while the LM43603QPWPTQ1 provides higher current at the cost of larger package, fixed frequency, and reduced light-load efficiency - making LM46000AQPWPTQ1 optimal for space-constrained, always-on automotive subsystems.
Availability
LM46000AQPWPTQ1 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 qualification and long-term production support.
Supply support for LM46000AQPWPTQ1 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 family was engineered specifically for automotive power conversion challenges - delivering wide-input, high-efficiency, EMI-robust buck regulation in thermally demanding environments with AEC-Q100 Grade 1 reliability.
FAQ
What is the maximum input voltage rating for LM46000AQPWPTQ1?
The LM46000AQPWPTQ1 has an absolute maximum input voltage rating of 65 V, with recommended operating range from 3.5 V to 60 V. This allows it to safely withstand automotive load-dump transients up to 60 V without external clamping, while maintaining regulation down to cold-crank conditions as low as 3.8 V for startup.
Does LM46000AQPWPTQ1 support output voltage tracking?
Yes, LM46000AQPWPTQ1 supports output voltage tracking via the SS/TRK pin. When an external voltage ramp is applied to this pin, the output follows the ramp with unity gain, enabling coordinated power-up sequencing with other rails in multi-voltage systems such as ADAS domain controllers or infotainment SoCs.
How does the BIAS pin improve efficiency in LM46000AQPWPTQ1?
The BIAS pin in LM46000AQPWPTQ1 allows connection to VOUT (3.3–28 V) or an external 3.3/5 V rail, bypassing the internal VCC LDO and reducing power loss. When used, it cuts operating quiescent current from 24 µA to 7–13 µA, significantly extending battery life in always-on automotive applications like telematics wake-up circuits.
What is the purpose of the thermal pad (PAD) on LM46000AQPWPTQ1?
The exposed thermal pad on LM46000AQPWPTQ1 is internally connected to AGND and serves as the primary heat dissipation path. It must be soldered to a large PCB copper pour to achieve the specified RθJB of 21.7°C/W. Proper thermal pad implementation is essential to maintain junction temperature below 125°C under 0.5 A load at +85°C ambient.
Can LM46000AQPWPTQ1 be synchronized to an external clock?
Yes, LM46000AQPWPTQ1 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). This capability enables EMI reduction by shifting switching noise away from sensitive frequency bands, such as AM radio or CAN bus communication windows.
LM46000AQPWPTQ1 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
LM46000AQPWPTQ1 FAQ
1.How can I place an order for LM46000AQPWPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM46000AQPWPTQ1 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 LM46000AQPWPTQ1 reliable?
The price and inventory of LM46000AQPWPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM46000AQPWPTQ1 is usually 5 days.
3.What payment methods are accepted for LM46000AQPWPTQ1?
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4.How is shipping managed for LM46000AQPWPTQ1?
LM46000AQPWPTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM46000AQPWPTQ1 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 LM46000AQPWPTQ1?
For technical support, including LM46000AQPWPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM46000AQPWPTQ1 requirements.
6.How does Aetrix verify that LM46000AQPWPTQ1 is sourced from the original manufacturer or authorized distributors?
All LM46000AQPWPTQ1 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 LM46000AQPWPTQ1 meets industry standards.
7.What is the process for return or replacement of LM46000AQPWPTQ1?
All LM46000AQPWPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM46000AQPWPTQ1, 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 LM46000AQPWPTQ1 part is unused and in its original packaging.
Return procedure for LM46000AQPWPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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