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Texas Instruments LM46002AQPWPTQ1
- Part No.:
- LM46002AQPWPTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM46002AQPWPTQ1.pdf
- Description:
- IC REG BUCK ADJ 2A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:419
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Product details
Overview
LM46002AQPWPTQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC-DC converter delivering up to 2 A output current across a 3.5 V to 60 V input range, featuring 27 µA quiescent current in regulation, internal compensation, and integrated power-good flag. It operates in PFM mode for high light-load efficiency and supports soft-start into pre-biased loads - ideal for 12-V/24-V automotive sub-AM band power rails.
For engineers reviewing the LM46002AQPWPTQ1 datasheet, LM46002AQPWPTQ1 pinout, LM46002AQPWPTQ1 application, or LM46002AQPWPTQ1 equivalent, key selection criteria include its wide VIN range, automotive-grade thermal performance (–40°C to +125°C ambient), EN-controlled precision UVLO (2.1 V typical), and EMI-tested compliance with EN55022 Class B radiated emissions limits.
Technical Context
The LM46002AQPWPTQ1 uses peak-current-mode control with fixed-frequency PWM (200 kHz–2.2 MHz adjustable) and automatic transition to PFM at light loads to maintain high efficiency. Its architecture integrates high-side (210 mΩ) and low-side (110 mΩ) MOSFETs, internal LDO biasing (VCC), and dual current-limit protection (peak 4.5 A / valley 2.05 A) with hiccup-mode short-circuit recovery.
It implements analog feedback via a precision 1.011 V reference (±1.2% over temperature), supports external frequency synchronization, output voltage tracking, and soft-start extension via capacitor on SS/TRK - all while maintaining stability with ceramic, polymer, tantalum, or aluminum output capacitors without external compensation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - enables direct connection to automotive battery rails including cold-crank (≥3.5 V) and load-dump transients (≤60 V). |
| Output Current | Up to 2 A continuous - sufficient for powering ADAS sensors, infotainment SoCs, or body-control microcontrollers. |
| Quiescent Current | 27 µA in regulation - extends battery life in always-on automotive modules such as telematics or gateway ECUs. |
| Feedback Reference | 1.011 V ±1.2% (–40°C to +125°C) - ensures tight output voltage accuracy across full automotive temperature range. |
| Switching Frequency | 200 kHz to 2.2 MHz (500 kHz default) - allows optimization of inductor size and EMI filtering for space-constrained PCB layouts. |
| Thermal Protection | 160°C shutdown / 150°C recovery - prevents thermal runaway during sustained overload or poor heatsinking in sealed enclosures. |
| EMI Compliance | Tested to EN55022/CISPR 22 Class B radiated emissions - reduces need for external EMI filters in automotive EMC validation. |
Pinout & Package
LM46002AQPWPTQ1 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 for PCB-level heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch node | Connects internally to both MOSFETs; must be routed with minimal loop area to power inductor and PGND for EMI control. |
| 3 CBOOT | Bootstrap capacitor terminal | Requires 470-nF ceramic capacitor to SW to enable high-side gate drive; critical for reliable 100% duty-cycle operation. |
| 4 VCC | Internal LDO output | Bypass with 1–10 µF capacitor to AGND; supplies internal circuitry - no external load permitted. |
| 5 BIAS | Optional LDO input | Tie to VOUT (3.3–28 V) or external rail to improve efficiency; bypass with 1–10 µF capacitor when used. |
| 6 SYNC | External clock input | Accepts 200 kHz–2.2 MHz square wave for EMI reduction via frequency dithering or system-level synchronization. |
| 7 RT | Frequency programming | Resistor to AGND sets switching frequency; open circuit = 500 kHz default; 1% tolerance recommended. |
| 8 PGOOD | Open-drain power-good flag | Signals valid VOUT (±10% / –20% thresholds); requires 10–100 kΩ pull-up to logic rail ≤12 V. |
| 9 FB | Feedback sense input | Monitors resistive divider midpoint; 1.011 V reference sets VOUT = 1.011 × (1 + RFBT/RFBB); avoid grounding. |
| 10 AGND | Analog ground reference | Reference for internal references and logic; connect directly to system ground plane with low-impedance path. |
| 11 SS/TRK | Soft-start / tracking control | Capacitor extends soft-start time; external ramp enables output voltage tracking during power sequencing. |
| 12 EN | Enable input | Logic-high (>2.1 V) enables regulator; precision threshold allows programmable system UVLO; never float. |
| 13, 14 VIN | Main input supply | Connects to high-side FET and internal LDO; route CIN close to VIN/PGND pins with shortest possible path. |
| 15, 16 PGND | Power ground | Low-side FET source return; tie to AGND, PAD, and CIN/COUT grounds; primary thermal conduction path. |
| PAD | Exposed thermal pad | Internally connected to PGND; must be soldered to large copper pour for thermal management and EMI shielding. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient) - certified for under-hood and cabin applications without derating. |
| Integrated synchronous rectification | Eliminates external Schottky diode; reduces conduction losses and improves full-load efficiency by ≥3% vs. asynchronous designs. |
| PFM/PWM hybrid operation | Automatic transition to PFM at light loads maintains >85% efficiency down to 1 mA, critical for always-on systems. |
| Pre-biased soft-start | Allows safe startup into powered outputs (e.g., hot-swap rails) without reverse current or output overshoot. |
| EMI-tested layout | Validated against EN55022 Class B using standard evaluation board - provides proven reference for production PCB design. |
| Output short-circuit protection | Hiccup-mode recovery (5.5 ms retry delay) prevents thermal damage during sustained shorts without latch-off. |
Applications
| Automotive Infotainment Power Supply | ADAS Camera Module Regulator |
|---|---|
|
Use Scenario: Powers 3.3-V or 5-V SoC, display interface, and audio codec in head-unit or digital cluster. IC Role / Device Role / Timing Role: Primary buck converter supplying stable, low-noise core voltage with fast transient response. Use Value: 27 µA IQ extends battery runtime during vehicle sleep mode; EN pin enables controlled power sequencing with MCU. |
Use Scenario: Supplies image sensor, ISP, and SerDes in rear-view or surround-view camera ECU. IC Role / Device Role / Timing Role: High-reliability point-of-load regulator with PGOOD signaling for system health monitoring. Use Value: AEC-Q100 qualification ensures operation at 125°C junction; hiccup-mode protection prevents field failures from cable shorts. |
| Commercial Vehicle Telematics Gateway | Industrial Control System DC-DC Stage |
|
Use Scenario: Converts 24-V truck battery to 5-V/3.3-V rails for GPS, cellular modem, and CAN controller. IC Role / Device Role / Timing Role: Wide-input buck regulator handling cold-crank (down to 3.5 V) and load-dump (up to 60 V). Use Value: 60-V absolute max rating eliminates need for upstream TVS clamping; SYNC pin enables spread-spectrum EMI reduction. |
Use Scenario: Provides isolated 12-V or 24-V auxiliary supply in PLC backplane or motor drive I/O module. IC Role / Device Role / Timing Role: Robust industrial-grade DC-DC stage tolerant of brownouts, surges, and extended temperature cycling. Use Value: Internal compensation and capacitor flexibility simplify BOM; thermal shutdown protects against enclosure overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM46002QPWPTQ1 | Same pinout and electrical specs, but optimized for PWM-only operation (no PFM); higher IQ (35 µA) in light-load regulation. | Suitable where constant-frequency operation is mandatory for EMI predictability, e.g., RF-sensitive medical devices. | Select LM46002AQPWPTQ1 for automotive battery-powered systems requiring lowest IQ; choose LM46002QPWPTQ1 only if PFM noise is unacceptable. |
| LM61480QRNXTQ1 | Higher 8-A output capability, 3.5–36-V input, 2.1-MHz max frequency, and lower RDS(on) (16 mΩ HS / 7 mΩ LS). | Targets higher-power ADAS domains (e.g., radar processors); not drop-in due to different pinout and package (16-pin QFN). | LM61480QRNXTQ1 offers scalability for future power upgrades but requires PCB redesign; LM46002AQPWPTQ1 remains optimal for 2-A space-constrained nodes. |
Compared with LM46002QPWPTQ1, the LM46002AQPWPTQ1 delivers superior light-load efficiency via PFM, while LM61480QRNXTQ1 provides higher current and lower conduction loss at the cost of larger footprint and non-compatible layout.
Availability
LM46002AQPWPTQ1 is available at Aetrix Electronics and suitable for automotive infotainment, ADAS camera modules, and commercial vehicle telematics requiring stable component supply with AEC-Q100 traceability and long-term lifecycle support.
Supply support for LM46002AQPWPTQ1 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 automotive ICs, with decades of expertise in power management solutions for safety-critical systems.
The LM46002-Q1 family was designed specifically for automotive power conversion - emphasizing wide input range, low IQ, EMI robustness, and AEC-Q100 reliability in harsh environments like engine compartments and chassis-mounted ECUs.
FAQ
What is the maximum input voltage rating for LM46002AQPWPTQ1?
The LM46002AQPWPTQ1 has an absolute maximum input voltage rating of 65 V across VIN-to-PGND, with recommended operating range from 3.5 V to 60 V. This allows direct connection to 24-V commercial vehicle batteries and tolerance of ISO 7637-2 pulse 5a load-dump transients up to 60 V, making LM46002AQPWPTQ1 suitable for under-hood applications without external clamping.
Does LM46002AQPWPTQ1 support output voltage tracking?
Yes, LM46002AQPWPTQ1 supports output voltage tracking via the SS/TRK pin. By connecting this pin to an external voltage ramp (e.g., from another regulator's soft-start node), the LM46002AQPWPTQ1 output follows that ramp, enabling precise power sequencing in multi-rail systems such as automotive domain controllers where coordinated startup is required.
How does the PGOOD function work on LM46002AQPWPTQ1?
The PGOOD pin on LM46002AQPWPTQ1 is an open-drain output that asserts high when VOUT reaches 90% of target (80–88% undervoltage trip) and deasserts low when VOUT falls below 90% (110–113% overvoltage trip), with 6% hysteresis. It requires a 10–100 kΩ pull-up resistor to a logic rail ≤12 V and provides system-level power health monitoring for microcontrollers or FPGA configuration logic.
Can LM46002AQPWPTQ1 operate with ceramic output capacitors only?
Yes, LM46002AQPWPTQ1 is internally compensated and stable with ceramic, polymer, tantalum, or aluminum output capacitors - no external compensation components needed. Its control loop is optimized for low-ESR ceramics, enabling compact, high-reliability designs common in automotive modules where capacitor lifetime and temperature stability are critical.
What is the thermal resistance of LM46002AQPWPTQ1 in its HTSSOP package?
LM46002AQPWPTQ1 in the 16-pin HTSSOP (PWP) package has a junction-to-ambient thermal resistance (RθJA) of 38.9°C/W on a 4-layer board, and a junction-to-board (RθJB) of 19.9°C/W. The exposed thermal pad must be soldered to a large PCB copper area to achieve these values; insufficient thermal land reduces effective heat dissipation and risks thermal shutdown under 2-A load at high ambient temperatures.
LM46002AQPWPTQ1 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:
- 2A
- 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
LM46002AQPWPTQ1 FAQ
1.How can I place an order for LM46002AQPWPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM46002AQPWPTQ1 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 LM46002AQPWPTQ1 reliable?
The price and inventory of LM46002AQPWPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM46002AQPWPTQ1 is usually 5 days.
3.What payment methods are accepted for LM46002AQPWPTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM46002AQPWPTQ1 transactions.
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4.How is shipping managed for LM46002AQPWPTQ1?
LM46002AQPWPTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM46002AQPWPTQ1 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 LM46002AQPWPTQ1?
For technical support, including LM46002AQPWPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM46002AQPWPTQ1 requirements.
6.How does Aetrix verify that LM46002AQPWPTQ1 is sourced from the original manufacturer or authorized distributors?
All LM46002AQPWPTQ1 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 LM46002AQPWPTQ1 meets industry standards.
7.What is the process for return or replacement of LM46002AQPWPTQ1?
All LM46002AQPWPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM46002AQPWPTQ1, 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 LM46002AQPWPTQ1 part is unused and in its original packaging.
Return procedure for LM46002AQPWPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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