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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Texas Instruments LM46000QPWPTQ1

Name: LM46000QPWPTQ1
Brand: Texas Instruments
SKU: LM46000QPWPTQ1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LM46000QPWPTQ1

Manufacturer:: Texas Instruments

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 16-PowerTSSOP (0.173", 4.40mm Width)

Datasheet:: LM46000QPWPTQ1.pdf

Description:: IC REG BUCK ADJ 500MA 16HTSSOP

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Product details

Overview

LM46000QPWPTQ1 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 a default 500 kHz switching frequency. It supports precision enable (2.1 V threshold), power-good flag, soft-start into pre-biased loads, and operates in PFM/DCM at light load for high efficiency in automotive sub-AM band power supplies.

For engineers reviewing the LM46000QPWPTQ1 datasheet, LM46000QPWPTQ1 pinout, LM46000QPWPTQ1 application, or LM46000QPWPTQ1 equivalent, key selection considerations include its wide VIN range, integrated synchronous FETs (R_DS(on) = 419 mΩ HS / 231 mΩ LS), EN-controlled UVLO, thermal shutdown at 160°C, and EMI-tested compliance with EN55022 Class B radiated emissions limits.

Technical Context

The LM46000QPWPTQ1 employs peak current mode control with fixed-frequency PWM, supporting discontinuous conduction mode (DCM) and pulse frequency modulation (PFM) for light-load efficiency optimization. Its internal compensation eliminates external loop components, while programmable frequency (200 kHz–2.2 MHz via RT pin) and external clock synchronization enable flexible noise management and EMI reduction.

It integrates dual MOSFETs, a precision reference (V_FB = 1.016 V ±10 mV), soft-start charge current (2.2 µA), and hiccup-mode short-circuit protection with 32-cycle retry delay. The device uses separate AGND and PGND pins, thermal pad (PAD) tied to ground for heat dissipation, and supports BIAS pin connection to V_OUT or external rail for improved efficiency.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3.5 V to 60 V - Enables direct connection to 12 V/24 V/48 V automotive batteries without pre-regulation.
Output Current	0.5 A continuous - Sufficient for low-power ECUs, sensors, and infotainment subsystems.
Quiescent Current	24 µA in regulation - Minimizes standby power loss in always-on automotive modules.
Switching Frequency	Default 500 kHz, adjustable 200 kHz–2.2 MHz - Balances size (higher f_SW) vs. efficiency (lower f_SW) and EMI filtering requirements.
Feedback Reference	1.016 V ±10 mV - Enables accurate output voltage setting (e.g., 3.3 V ±1%) using standard resistor dividers.
Thermal Shutdown	160°C trip, 150°C recovery - Protects against sustained overload or poor PCB heatsinking in enclosed automotive environments.
EMI Compliance	Tested to EN55022/CISPR 22 Class B - Validated radiated and conducted emissions on evaluation board, reducing system-level certification risk.

Pinout & Package

LM46000QPWPTQ1 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 requiring PCB copper pour for thermal performance.

Pin/Terminal	Circuit Role	Design Meaning
SW (1,2)	Switch node	Connects to inductor; carries high di/dt switching current; requires short, low-inductance layout to minimize EMI and losses.
CBOOT (3)	Bootstrap capacitor terminal	Supplies gate drive for high-side FET; requires 470 nF ceramic capacitor between CBOOT and SW.
VCC (4)	Internal LDO output	Bypass with 1–10 µF capacitor to AGND; powers internal circuitry; no external load permitted.
BIAS (5)	Optional LDO input	Tie to V_OUT (if 3.3 V ≤ V_OUT ≤ 28 V) or external 3.3 V/5 V rail to reduce power loss; tie to GND if unused.
SYNC (6)	External clock input	Accepts 200 kHz–2.2 MHz square wave; enables synchronized operation across multiple converters to avoid beat frequencies.
RT (7)	Frequency programming	Resistor to AGND sets f_SW; open circuit defaults to 500 kHz; 1% tolerance recommended for accuracy.
PGOOD (8)	Open-drain power-good flag	Asserts high when V_OUT is within ±7% of target; requires 10–100 kΩ pull-up; supports sequencing and fault monitoring.
FB (9)	Feedback input	Senses output voltage divider midpoint; internal 1.016 V reference enables precise regulation independent of temperature drift.
AGND (10)	Analog ground	Reference for FB, SS/TRK, EN, SYNC, RT; must be star-connected to PGND near device to avoid noise coupling.
SS/TRK (11)	Soft-start/tracking control	Internal 4.1 ms soft-start when floating; add capacitor to extend ramp time; connect to external ramp for output voltage tracking.
EN (12)	Enable input	Logic-high (>2.1 V) enables regulator; precision UVLO allows system-level brownout detection and controlled startup.
VIN (13,14)	Main input supply	Connects to high-frequency input capacitor (C_IN); dual pins reduce IR drop and improve thermal performance.
PGND (15,16)	Power ground	Low-side FET source return; connects to C_IN, C_OUT, and thermal pad; must be low-impedance plane under device.
PAD	Thermal pad	Internally connected to AGND; primary heat path; requires solid copper pour and ≥4 thermal vias to inner/outer ground planes.

Key Features

Feature	Design Value
Integrated synchronous FETs	Eliminates external diode and reduces conduction loss - R_DS(on) = 419 mΩ (HS) / 231 mΩ (LS) at T_J = 25°C.
Internal compensation	Reduces BOM count and layout sensitivity - no external Type II/III compensation network required.
Pre-biased soft-start	Enables safe startup into powered systems (e.g., hot-plug modules) without output voltage overshoot or reverse current.
Output voltage tracking	Supports multi-rail sequencing by connecting SS/TRK to external voltage ramp - critical for FPGA or processor core/I/O rail coordination.
Hiccup-mode short-circuit protection	Limits average power during fault - 32-cycle wait + 5.5 ms retry delay prevents thermal runaway and enables self-recovery.
AEC-Q100 Grade 1 qualification	Validated for –40°C to +125°C junction operation - meets automotive engine bay and cabin ambient requirements without derating.

Applications

Automotive Sub-AM Band Power Supply	Telecom Remote Radio Unit (RRU)
Use Scenario: Powering CAN transceiver, LIN interface, and microcontroller in 12 V/24 V vehicle battery systems with cold-crank (4.5 V) and load-dump (60 V) transients. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 3.3 V or 5 V rail; handles wide input excursions without dropout or shutdown. Use Value: 3.5 V minimum start-up and 60 V absolute max rating ensure uninterrupted operation during automotive battery faults.	Use Scenario: Generating isolated 5 V bias for RF front-end amplifiers in outdoor telecom base stations with wide ambient temperature variation. IC Role / Device Role / Timing Role: Point-of-load (POL) converter downstream of 48 V intermediate bus; delivers clean, regulated 5 V at 0.5 A. Use Value: 24 µA quiescent current and PFM operation maintain >85% efficiency at 10 mA load, extending uptime in backup battery mode.
Commercial Vehicle Telematics Module	Industrial IoT Edge Controller
Use Scenario: Powering GPS/GNSS receiver, cellular modem, and ARM Cortex-M7 MCU in heavy-duty truck telematics units exposed to vibration and thermal cycling. IC Role / Device Role / Timing Role: Main system regulator with PGOOD signaling to MCU for power sequencing and fault reporting. Use Value: EN pin precision UVLO (2.1 V ±305 mV hysteresis) enables reliable brownout detection before MCU resets.	Use Scenario: Regulating 3.3 V for industrial Ethernet PHY, real-time OS processor, and analog sensor interface in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Wide-VIN buck converter with tracking capability to coordinate startup with FPGA I/O bank rails. Use Value: SS/TRK pin supports external voltage ramp tracking - ensures proper power-up order for mixed-voltage SoCs.

Automotive Sub-AM Band Power Supply

Telecom Remote Radio Unit (RRU)

Use Scenario: Powering CAN transceiver, LIN interface, and microcontroller in 12 V/24 V vehicle battery systems with cold-crank (4.5 V) and load-dump (60 V) transients.

IC Role / Device Role / Timing Role: Primary buck regulator providing stable 3.3 V or 5 V rail; handles wide input excursions without dropout or shutdown.

Use Value: 3.5 V minimum start-up and 60 V absolute max rating ensure uninterrupted operation during automotive battery faults.

Use Scenario: Generating isolated 5 V bias for RF front-end amplifiers in outdoor telecom base stations with wide ambient temperature variation.

IC Role / Device Role / Timing Role: Point-of-load (POL) converter downstream of 48 V intermediate bus; delivers clean, regulated 5 V at 0.5 A.

Use Value: 24 µA quiescent current and PFM operation maintain >85% efficiency at 10 mA load, extending uptime in backup battery mode.

Commercial Vehicle Telematics Module

Industrial IoT Edge Controller

Use Scenario: Powering GPS/GNSS receiver, cellular modem, and ARM Cortex-M7 MCU in heavy-duty truck telematics units exposed to vibration and thermal cycling.

IC Role / Device Role / Timing Role: Main system regulator with PGOOD signaling to MCU for power sequencing and fault reporting.

Use Value: EN pin precision UVLO (2.1 V ±305 mV hysteresis) enables reliable brownout detection before MCU resets.

Use Scenario: Regulating 3.3 V for industrial Ethernet PHY, real-time OS processor, and analog sensor interface in DIN-rail mounted controllers.

IC Role / Device Role / Timing Role: Wide-VIN buck converter with tracking capability to coordinate startup with FPGA I/O bank rails.

Use Value: SS/TRK pin supports external voltage ramp tracking - ensures proper power-up order for mixed-voltage SoCs.

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous buck regulator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LM46001QPWPTQ1	1.0 A output current, identical pinout and feature set; higher R_DS(on) (480 mΩ HS / 260 mΩ LS) due to larger FETs.	Required where load exceeds 0.5 A but board space and thermal budget allow same footprint.	Select when future-proofing for higher current or when margin is needed for aging or temperature derating.
LM43600QPWPTQ1	Same 0.5 A rating and HTSSOP-16 package; lower IQ (18 µA), narrower VIN (4.5 V–60 V), no BIAS pin.	Suitable for cost-sensitive designs where 3.5 V start-up is not required and BIAS optimization is unnecessary.	Choose for simplified BOM and lower quiescent current if input never drops below 4.5 V and efficiency gain from BIAS is marginal.

Compared with LM46000QPWPTQ1, LM46001QPWPTQ1 provides 100% higher current capacity in identical layout, while LM43600QPWPTQ1 trades 0.5 V lower VIN start-up and BIAS flexibility for reduced IQ - enabling trade-offs between robustness, efficiency, and cost in automotive power design.

Availability

LM46000QPWPTQ1 is available at Aetrix Electronics and suitable for automotive sub-AM band power supplies, commercial vehicle telematics modules, and industrial IoT edge controllers requiring stable component supply with AEC-Q100 qualification and long-term production support.

Supply support for LM46000QPWPTQ1 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 LM46000QPWPTQ1 belongs to TI's automotive-qualified wide-VIN buck regulator family, designed specifically for harsh-environment power conversion in vehicles, commercial transport, and industrial equipment where input transients and thermal stress are routine.

FAQ

What is the minimum input voltage required for the LM46000QPWPTQ1 to start switching?

The LM46000QPWPTQ1 requires a minimum input voltage of 3.8 V to initiate startup and enter regulation. This specification ensures reliable operation during automotive cold-crank conditions down to 4.5 V battery voltage, with margin for PCB trace losses. Below 3.8 V, the device remains in shutdown with only 2.3 µA quiescent current. The LM46000QPWPTQ1 does not operate below this threshold, even if EN is asserted.

Can the LM46000QPWPTQ1 be synchronized to an external clock, and what are the valid frequency and signal requirements?

Yes, the LM46000QPWPTQ1 supports external clock synchronization via the SYNC pin across 200 kHz to 2.2 MHz. The input must be a clean square wave with high-level threshold ≥2 V and low-level threshold ≤0.4 V, duty cycle between 10% and 90%, and minimum ON/OFF time ≥80 ns. Improper termination causes ringing that may trigger false switching; TI recommends 50 Ω series termination close to the SYNC pin.

How does the BIAS pin function on the LM46000QPWPTQ1, and when should it be used?

The BIAS pin on the LM46000QPWPTQ1 provides an optional input to the internal LDO, improving efficiency when V_OUT is between 3.3 V and 28 V (tie BIAS to V_OUT) or when a clean 3.3 V/5 V rail is available. When unused (V_OUT < 3.3 V), BIAS must be tied to ground - floating is prohibited. Using BIAS reduces power loss by bypassing the VIN-to-VCC LDO path, lowering total quiescent current from 24 µA to ~13 µA in switching mode.

What is the purpose of the SS/TRK pin on the LM46000QPWPTQ1, and how does it differ between soft-start and tracking modes?

The SS/TRK pin on the LM46000QPWPTQ1 serves dual functions: when left floating, it enables internal 4.1 ms soft-start; when connected to a capacitor, it extends ramp time linearly with capacitance; when driven by an external voltage ramp, it forces V_OUT to track that ramp. This enables coordinated power-up of multiple rails (e.g., FPGA core and I/O) without additional sequencing ICs. The pin sources a constant 2.2 µA current for controlled voltage rise.

Does the LM46000QPWPTQ1 include overtemperature protection, and how does it behave during thermal fault?

Yes, the LM46000QPWPTQ1 includes thermal shutdown protection that triggers at 160°C junction temperature and recovers at 150°C. During fault, the device halts switching, disables both MOSFETs, and holds PGOOD low. It does not latch off - after cooling below 150°C, it automatically resumes normal operation without requiring EN toggle. This hiccup-style behavior prevents damage during transient overloads while maintaining system recoverability.

LM46000QPWPTQ1 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

LM46000QPWPTQ1 FAQ

1.How can I place an order for LM46000QPWPTQ1 through Aetrix?

Please submit a Request for Quotation (RFQ) for LM46000QPWPTQ1 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 LM46000QPWPTQ1 reliable?

The price and inventory of LM46000QPWPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM46000QPWPTQ1 is usually 5 days.

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Once your LM46000QPWPTQ1 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 LM46000QPWPTQ1?

For technical support, including LM46000QPWPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM46000QPWPTQ1 requirements.

6.How does Aetrix verify that LM46000QPWPTQ1 is sourced from the original manufacturer or authorized distributors?

All LM46000QPWPTQ1 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 LM46000QPWPTQ1 meets industry standards.

7.What is the process for return or replacement of LM46000QPWPTQ1?

All LM46000QPWPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM46000QPWPTQ1, 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 LM46000QPWPTQ1 part is unused and in its original packaging.

Return procedure for LM46000QPWPTQ1:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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