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Texas Instruments LM46002QPWPTQ1
- Part No.:
- LM46002QPWPTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM46002QPWPTQ1.pdf
- Description:
- IC REG BUCK ADJ 2A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
LM46002QPWPTQ1 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, integrated synchronous rectification, and adjustable switching frequency from 200 kHz to 2.2 MHz - deployed in sub-AM band 12-V/24-V automotive power supplies.
For engineers reviewing the LM46002QPWPTQ1 datasheet, LM46002QPWPTQ1 pinout, LM46002QPWPTQ1 application, or LM46002QPWPTQ1 equivalent, key selection considerations include its precision enable threshold (2.1 V ±0.22 V), power-good flag with 80–113% FB hysteresis, thermal shutdown at 160°C, and HTSSOP-16 package compatibility with LM4360x/LM4600x families.
Technical Context
The LM46002QPWPTQ1 uses peak-current-mode control with internal compensation, enabling stable operation with ceramic, polymer, tantalum, or aluminum output capacitors without external loop compensation. Its architecture integrates high-side (210 mΩ) and low-side (110 mΩ) MOSFETs, a 1.011-V ±10 mV feedback reference, and cycle-by-cycle current limiting with hiccup-mode short-circuit protection.
It supports multiple operating modes: forced PWM, PFM for light-load efficiency, and synchronization to external clocks via SYNC pin. The device implements soft-start into pre-biased loads, output voltage tracking via SS/TRK, and dual enable thresholds - one for VCC activation (1.2 V) and one for precise system UVLO (2.1 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - supports wide automotive battery transients including cold-crank (down to 3.5 V) and load-dump (up to 60 V) |
| Output Current | 2 A continuous - sufficient for powering microcontrollers, sensors, and CAN transceivers in automotive ECUs |
| Quiescent Current | 27 µA in regulation - enables always-on functionality in vehicle body control modules without excessive battery drain |
| Switching Frequency | 200 kHz to 2.2 MHz adjustable - allows EMI optimization and inductor size reduction while maintaining >90% efficiency at 1 A |
| Feedback Reference | 1.011 V ±10 mV - enables accurate output regulation from 1 V to 28 V using standard resistor dividers |
| Thermal Shutdown | 160°C trip / 150°C recovery - protects against sustained overload or poor PCB heat sinking in enclosed automotive environments |
| Power-Good Flag | Open-drain PGOOD with 80–113% FB hysteresis - provides reliable system sequencing and fault detection for downstream logic |
Pinout & Package
The LM46002QPWPTQ1 is housed in a 16-pin HTSSOP (PWP) package measuring 6.6 mm × 5.1 mm × 1.2 mm with 0.65-mm lead pitch and exposed thermal pad for enhanced thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch node | Connects to inductor; carries high-frequency AC current; requires low-inductance layout to minimize EMI and losses |
| 3 CBOOT | Bootstrap capacitor connection | Supplies gate drive voltage for high-side MOSFET; requires 470-nF ceramic capacitor between CBOOT and SW |
| 4 VCC | Internal LDO bias supply output | Bypassed to AGND; powers internal circuitry; must not be loaded externally or shorted to ground |
| 5 BIAS | Optional LDO input | Improves efficiency when tied to VOUT (3.3–28 V) or external 3.3/5-V rail; bypassed with 1–10 µF capacitor |
| 6 SYNC | External clock synchronization input | Enables EMI reduction by aligning switching edges to system clock; requires proper high-speed termination |
| 7 RT | Frequency programming | Resistor to AGND sets frequency; open-circuit defaults to 500 kHz; supports 200 kHz–2.2 MHz range |
| 8 PGOOD | Power-good flag output | Open-drain signal indicating regulated output; requires 10–100 kΩ pull-up to ≤12 V logic rail |
| 9 FB | Feedback sense input | Monitors output via resistor divider; 1.011-V reference enables precise VOUT setting from 1 V to 28 V |
| 10 AGND | Analog ground reference | Ground for internal references and control logic; must be connected to system ground with low-impedance path |
| 11 SS/TRK | Soft-start and tracking control | Capacitor extends soft-start time; external ramp enables output voltage tracking during power-up sequences |
| 12 EN | Enable input | Logic-level control: high = ON (threshold 2.1 V), low = OFF; supports precision UVLO and system sequencing |
| 13, 14 VIN | Main input supply pins | Connect to input source and high-frequency bypass capacitors; shortest possible path to PGND required |
| 15, 16 PGND | Power ground return | Low-side MOSFET source connection; ties to system ground, AGND, CIN/COUT grounds, and thermal pad |
| PAD | Exposed thermal pad | Internally connected to PGND; primary heat dissipation path; must be soldered to large copper area on PCB |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C ambient) - validated for under-hood and cabin ECU applications |
| EMI compliance | Tested to EN55022/CISPR 22 Class B radiated/conducted limits - reduces need for external filtering in automotive designs |
| Light-load efficiency | Discontinuous conduction mode (DCM) and automatic frequency reduction - maintains >85% efficiency at 10 mA load |
| Pre-biased soft-start | Safe startup into pre-charged output rails - prevents reverse current flow and system reset during hot-plug events |
| Short-circuit protection | Hiccup-mode current limiting - cycles on/off after overcurrent detection to limit power dissipation and prevent thermal runaway |
| Flexible enable interface | Dual-threshold precision enable (2.1 V rising / 1.81 V falling) - enables robust system-level undervoltage lockout without external comparators |
Applications
| Automotive Body Control Module (BCM) | Commercial Vehicle Telematics Unit |
|---|---|
Use Scenario: Powers MCU, LIN transceivers, and sensor interfaces in door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary 5-V or 3.3-V point-of-load regulator with precise enable sequencing and PGOOD monitoring. Use Value: 27-µA quiescent current enables always-on wake-up capability; AEC-Q100 qualification ensures reliability across temperature extremes. |
Use Scenario: Supplies GPS, cellular modem, and CAN FD interfaces in fleet management systems. IC Role / Device Role / Timing Role: Wide-input buck converter handling 12-V/24-V commercial vehicle batteries with transient tolerance. Use Value: 60-V max input withstands load-dump events; SYNC pin enables spread-spectrum alignment with baseband clocks to reduce EMI. |
| Automotive Infotainment Power Supply | Industrial Motor Drive Auxiliary Rail |
Use Scenario: Generates clean 1.2-V core and 3.3-V I/O rails for SoCs and display controllers in head units. IC Role / Device Role / Timing Role: High-efficiency synchronous buck with internal compensation and output voltage tracking. Use Value: SS/TRK pin enables controlled ramp-up of multiple rails; 1.011-V FB reference ensures <±1% output accuracy over temperature. |
Use Scenario: Provides isolated 15-V gate drive and 5-V logic supply for IGBT drivers in HVAC and pump inverters. IC Role / Device Role / Timing Role: Robust wide-VIN buck converter supporting industrial 24-V/48-V bus architectures. Use Value: Thermal shutdown and hiccup-mode protection prevent failure during motor stall conditions; HTSSOP package simplifies thermal design. |
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 | Optimized for PFM operation; lower light-load IQ (22 µA typical); identical pinout and package | Better suited for battery-powered automotive modules requiring ultra-low standby power | Select LM46002AQPWPTQ1 for new designs where light-load efficiency is prioritized over fixed-frequency EMI control |
| LM43602QPWPTQ1 | 36-V max input (vs. 60 V); same 2-A rating, HTSSOP-16 package, and feature set | Limited to 12-V/24-V systems without extended transients; not suitable for 48-V mild-hybrid architectures | Choose LM43602QPWPTQ1 only if input never exceeds 36 V and cost sensitivity outweighs transient robustness needs |
Compared with LM46002QPWPTQ1, the LM46002AQPWPTQ1 improves light-load efficiency but sacrifices some EMI predictability, while the LM43602QPWPTQ1 reduces input voltage headroom - making LM46002QPWPTQ1 the optimal choice for full automotive transient coverage and balanced performance.
Availability
LM46002QPWPTQ1 is available at Aetrix Electronics and suitable for automotive body control modules, commercial vehicle telematics units, and infotainment power supplies requiring stable component supply, AEC-Q100 compliance, and long-term production continuity.
Supply support for LM46002QPWPTQ1 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 deep expertise in automotive-grade reliability and functional safety.
The LM46002QPWPTQ1 belongs to TI's automotive-qualified DC-DC converter product line, designed specifically for demanding automotive power conversion tasks including engine control, ADAS, and infotainment systems.
FAQ
What is the minimum input voltage required for the LM46002QPWPTQ1 to start switching?
The LM46002QPWPTQ1 requires a minimum input voltage of 3.8 V to initiate startup and begin regulation. This threshold ensures reliable operation during automotive cold-crank conditions while maintaining sufficient headroom for the internal LDO to power control circuitry. Below 3.8 V, the device remains in shutdown with only 2.3–5 µA quiescent current drawn from VIN.
How does the LM46002QPWPTQ1 handle output short-circuit conditions?
The LM46002QPWPTQ1 responds to output short circuits with hiccup-mode protection: it shuts down upon detecting valley current limit violation, waits 5.5 ms, then attempts restart. This cycle repeats until the fault clears, limiting average power dissipation and preventing thermal damage. Peak current limit is 3.6–5 A, and valley limit is 1.8–2.3 A - both tested and specified over temperature.
Can the LM46002QPWPTQ1 operate with ceramic output capacitors only?
Yes, the LM46002QPWPTQ1 is internally compensated and stable with ceramic, polymer, tantalum, or aluminum output capacitors - no external compensation components required. Its control loop is optimized for low-ESR ceramics, enabling compact, high-performance designs without stability trade-offs or additional BOM cost.
What is the purpose of the BIAS pin on the LM46002QPWPTQ1?
The BIAS pin on the LM46002QPWPTQ1 provides an optional input to the internal LDO, improving efficiency when tied to VOUT (for 3.3–28 V outputs) or an external 3.3/5-V rail. When used, it reduces power loss in the internal LDO by bypassing the VIN-to-VCC drop. If unused, BIAS must be tied to ground - floating this pin is not allowed.
Does the LM46002QPWPTQ1 support output voltage tracking during power-up?
Yes, the LM46002QPWPTQ1 supports output voltage tracking via the SS/TRK pin: connecting this pin to an external voltage ramp (e.g., from another regulator's soft-start node) forces the LM46002QPWPTQ1 output to follow that ramp, enabling coordinated power sequencing across multiple rails without external circuitry.
LM46002QPWPTQ1 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:
- 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
LM46002QPWPTQ1 FAQ
1.How can I place an order for LM46002QPWPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM46002QPWPTQ1 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 LM46002QPWPTQ1 reliable?
The price and inventory of LM46002QPWPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM46002QPWPTQ1 is usually 5 days.
3.What payment methods are accepted for LM46002QPWPTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM46002QPWPTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM46002QPWPTQ1?
LM46002QPWPTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM46002QPWPTQ1 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 LM46002QPWPTQ1?
For technical support, including LM46002QPWPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM46002QPWPTQ1 requirements.
6.How does Aetrix verify that LM46002QPWPTQ1 is sourced from the original manufacturer or authorized distributors?
All LM46002QPWPTQ1 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 LM46002QPWPTQ1 meets industry standards.
7.What is the process for return or replacement of LM46002QPWPTQ1?
All LM46002QPWPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM46002QPWPTQ1, 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 LM46002QPWPTQ1 part is unused and in its original packaging.
Return procedure for LM46002QPWPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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