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Texas Instruments LM46001QPWPTQ1
- Part No.:
- LM46001QPWPTQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM46001QPWPTQ1.pdf
- Description:
- IC REG BUCK ADJ 1A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:389
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Product details
Overview
LM46001QPWPTQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified 3.5 V to 60 V input, 1 A synchronous step-down DC-DC converter in a 16-pin HTSSOP package. It delivers up to 1 A output current with 24 µA quiescent current in regulation, adjustable 200 kHz–2.2 MHz switching frequency (500 kHz default), and integrated power-good flag - used in automotive sub-AM band 12 V/24 V power supplies.
For engineers reviewing the LM46001QPWPTQ1 datasheet, LM46001QPWPTQ1 pinout, LM46001QPWPTQ1 application, or LM46001QPWPTQ1 equivalent, key selection criteria include wide VIN range support, PFM/DCM light-load efficiency, EN-controlled precision UVLO, internal soft-start (4.1 ms), and EN55022 Class B EMI compliance verified on evaluation board.
Technical Context
The LM46001QPWPTQ1 uses peak current mode control with fixed-frequency PWM, DCM, and automatic PFM transition at light loads to maintain high efficiency across 0–1 A output. Its internal compensation eliminates external loop components, while cycle-by-cycle current limiting and hiccup-mode short-circuit protection ensure robust operation under fault conditions.
It integrates both high-side (419 mΩ) and low-side (231 mΩ) MOSFETs, supports external frequency synchronization (200 kHz–2.2 MHz), and features dual enable thresholds: 2.1 V ±305 mV for VOUT regulation control and 1.2 V/0.4 V for VCC LDO activation. The BIAS pin enables efficiency optimization by connecting to VOUT (3.3–28 V) or external rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - supports direct connection to automotive battery rails including cold-crank (≥3.5 V startup) and load-dump transients. |
| Output Current | 1 A continuous - sufficient for powering infotainment SoCs, ADAS sensors, or gateway MCUs without external current boosting. |
| Quiescent Current | 24 µA in regulation - enables always-on systems (e.g., telematics wake-up circuits) to meet <100 µA system standby targets. |
| Switching Frequency | 200 kHz to 2.2 MHz (500 kHz default) - allows trade-off between inductor size (high-freq) and conduction loss (low-freq); RT pin programmable with 1% resistor. |
| Feedback Reference | 1.016 V ±10 mV (–40°C to +125°C) - enables accurate 1% output voltage setting over full automotive temperature range using standard resistor dividers. |
| EMI Compliance | Tested to EN55022/CISPR 22 Class B radiated & conducted emissions - validated on LM46001QPWPEVM with no input filter required for pass. |
| Thermal Shutdown | 160°C shutdown / 150°C recovery - protects against sustained overload or poor PCB heatsinking in enclosed automotive enclosures. |
Pinout & Package
LM46001QPWPTQ1 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 package supports high-power density layouts and requires soldering the pad to a multi-layer ground plane for optimal thermal performance (RθJB = 21.7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2) | Switch node | Connects to inductor; carries high di/dt switching current - must be routed with minimal loop area to reduce EMI. |
| CBOOT (3) | Bootstrap capacitor terminal | Requires 470 nF ceramic cap to SW; enables high-side FET gate drive above VIN - critical for duty cycle >90%. |
| VCC (4) | Internal bias LDO output | Bypass with 1–10 µF to AGND; powers internal circuitry - never connect external load or short to ground. |
| BIAS (5) | Optional LDO input | Tie to VOUT (if 3.3–28 V) or external 3.3/5 V rail to improve efficiency; tie to GND if unused (VOUT < 3.3 V). |
| SYNC (6) | External clock input | Accepts 200 kHz–2.2 MHz square wave; requires proper high-speed termination - float or ground if unused. |
| RT (7) | Frequency set resistor | Connect resistor to AGND to adjust frequency; open circuit = 500 kHz default - tolerance impacts accuracy by ±10%. |
| PGOOD (8) | Open-drain power-good flag | Asserts high when VOUT is within ±10% of target; requires 10–100 kΩ pull-up to ≤12 V logic rail. |
| FB (9) | Feedback voltage sense | Connects to resistor divider midpoint; 1.016 V reference sets VOUT = 1.016 × (1 + RFBT/RFBB). |
| AGND (10) | Analog ground reference | Reference for FB, SS/TRK, EN, SYNC, RT - connect directly to PGND at single point near IC to avoid noise coupling. |
| SS/TRK (11) | Soft-start / tracking control | Internal 4.1 ms soft-start when floating; add capacitor for extended ramp; connect to external ramp for sequencing. |
| EN (12) | Enable input | Active-high logic; 2.1 V threshold enables regulation - supports precision UVLO programming via resistor divider from VIN. |
| VIN (13,14) | Main power input | Connect to bulk input capacitor (CIN) with shortest possible path to PGND pins - critical for high-frequency noise suppression. |
| PGND (15,16) | Power ground return | Low-impedance return for low-side FET and CIN/COUT; must be tied to AGND and thermal pad on PCB. |
| PAD | Exposed thermal pad | Internally connected to AGND; primary heat dissipation path - must be soldered to ≥2 cm² copper pour on inner layer. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode - reduces conduction loss and improves full-load efficiency by up to 5% vs. asynchronous designs. |
| Internal compensation | Removes need for external Type II/III compensation network - cuts BOM count and simplifies layout while maintaining stability across all ceramic/polymer/tantalum output caps. |
| Power-good flag with hysteresis | PGOOD asserts only when VOUT is within ±10% of target and holds for 220 µs - prevents false resets during transient load steps. |
| Soft-start into pre-biased load | Enables safe startup when output is already charged (e.g., hot-swap or backup rail) - avoids reverse current flow through output FET. |
| Output voltage tracking | SS/TRK pin accepts external voltage ramp - allows coordinated sequencing with other rails (e.g., core vs. I/O) in multi-rail systems. |
| Thermal shutdown with hiccup mode | Enters 5.5 ms retry cycle after overtemperature trip - limits average power during sustained fault, preventing thermal runaway. |
Applications
| Automotive Infotainment Power Supply | Commercial Vehicle Telematics Module |
|---|---|
Use Scenario: Powers 3.3 V SoC, display interface, and audio codec in head-unit with 12 V/24 V battery input and cold-crank survival requirement. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 3.3 V at up to 1 A with EN-controlled wake-up and PGOOD confirmation. Use Value: 24 µA quiescent current extends battery life in parked state; EN precision threshold (2.1 V ±305 mV) ensures reliable cold-crank operation down to 6 V. |
Use Scenario: Supplies 5 V rail for GPS/GSM module, CAN transceiver, and microcontroller in fleet management ECU operating across 9–36 V vehicle range. IC Role / Device Role / Timing Role: Wide-VIN step-down converter with SYNC input synchronized to system clock to reduce beat frequencies in multi-converter designs. Use Value: 200 kHz–2.2 MHz frequency adjustability enables EMI tuning; EN55022 Class B compliance eliminates need for external filters in compact enclosures. |
| Industrial Gateway Controller | Railway Signaling Interface |
Use Scenario: Generates stable 12 V intermediate rail from 24 V or 48 V industrial bus to power isolated Ethernet PHYs and RS-485 transceivers. IC Role / Device Role / Timing Role: High-efficiency buck converter with BIAS pin tied to 12 V output - improves light-load efficiency by bypassing internal VCC LDO. Use Value: Internal soft-start (4.1 ms) prevents inrush into large output capacitance; PGOOD enables safe firmware initialization before enabling downstream isolators. |
Use Scenario: Provides 24 V auxiliary supply from 72 V/110 V railway battery for LED status indicators and relay drivers in safety-critical signaling boxes. IC Role / Device Role / Timing Role: Automotive-grade buck regulator operating at 200 kHz to minimize EMI in proximity to sensitive track circuit receivers. Use Value: AEC-Q100 Grade 1 qualification (–40°C to +125°C) ensures reliability in unventilated outdoor cabinets; hiccup-mode protection prevents latch-up during shorted LED strings. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous step-down converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM46002QPWPTQ1 | 2 A output current rating; identical pinout, package, and feature set - shares same 16-pin HTSSOP footprint and control interface. | Required where higher load current (e.g., multi-core MCU + DDR memory) exceeds 1 A capability of LM46001QPWPTQ1. | Select when future-proofing for higher current or designing across multiple SKUs with shared layout - no PCB change needed. |
| LM43603QPWPTQ1 | 3.5–36 V input range (vs. 3.5–60 V); 3 A output; pin-compatible but lacks BIAS pin and has different EN threshold (1.22 V). | Suitable for 12 V/24 V automotive systems without 48 V or load-dump requirements - lower max VIN reduces stress margin. | Choose for cost-sensitive 24 V-only applications where 60 V rating is unnecessary; verify EN threshold compatibility with host MCU GPIO. |
Compared with LM46002QPWPTQ1 and LM43603QPWPTQ1, the LM46001QPWPTQ1 offers optimal balance of 1 A capability, 60 V input resilience, and BIAS-enabled efficiency - making it ideal for space-constrained automotive subsystems needing precise cold-crank behavior and EMI compliance without over-specifying current or voltage.
Availability
LM46001QPWPTQ1 is available at Aetrix Electronics and suitable for automotive infotainment power supplies, commercial vehicle telematics modules, and industrial gateway controllers requiring stable component supply with AEC-Q100 qualification and long-term production support.
Supply support for LM46001QPWPTQ1 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 decades of automotive-grade power management innovation.
The LM46001-Q1 belongs to TI's automotive-qualified DC-DC converter family designed specifically for harsh-environment vehicle subsystems - emphasizing wide input range, low IQ, EMI robustness, and functional safety readiness.
FAQ
What is the minimum input voltage required for the LM46001QPWPTQ1 to start switching?
The LM46001QPWPTQ1 requires a minimum input voltage of 3.8 V to initiate startup and enter regulation. This ensures reliable operation during automotive cold-crank events where battery voltage may dip to 6 V or lower - the device maintains regulation down to 3.5 V once running, but startup requires ≥3.8 V on VIN pins relative to PGND.
Does the LM46001QPWPTQ1 support output voltage tracking for power sequencing?
Yes, the LM46001QPWPTQ1 supports output voltage tracking via the SS/TRK pin. When an external voltage ramp is applied to this pin, the output follows that ramp - enabling precise sequencing with other rails in multi-voltage systems such as processors with separate core/I/O supplies. Internal soft-start defaults to 4.1 ms when the pin is left floating.
Can the LM46001QPWPTQ1 be synchronized to an external clock, and what is the acceptable frequency range?
Yes, the LM46001QPWPTQ1 accepts an external clock signal on the SYNC pin for frequency synchronization. It supports input clocks from 200 kHz to 2.2 MHz with TTL-compatible thresholds (0.4 V low, 2 V high) and 10–90% duty cycle tolerance. This allows noise-sensitive systems to align switching edges and avoid beat frequencies in multi-regulator designs.
What is the purpose of the BIAS pin on the LM46001QPWPTQ1, and how should it be configured?
The BIAS pin on the LM46001QPWPTQ1 provides an optional input to the internal LDO, improving light-load efficiency. When VOUT is between 3.3 V and 28 V, TI recommends tying BIAS directly to VOUT; otherwise, connect to a clean 3.3 V or 5 V rail. If unused (e.g., VOUT < 3.3 V), tie BIAS to ground - never leave it floating.
How does the LM46001QPWPTQ1 handle short-circuit conditions on the output?
The LM46001QPWPTQ1 responds to output short-circuit with hiccup-mode protection: it shuts down for 5.5 ms after detecting valley-current limit violation, then retries. This limits average power dissipation and prevents thermal damage during sustained faults - unlike latch-off protection, hiccup mode enables automatic recovery once the fault clears.
LM46001QPWPTQ1 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:
- 1A
- 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
LM46001QPWPTQ1 FAQ
1.How can I place an order for LM46001QPWPTQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM46001QPWPTQ1 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 LM46001QPWPTQ1 reliable?
The price and inventory of LM46001QPWPTQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM46001QPWPTQ1 is usually 5 days.
3.What payment methods are accepted for LM46001QPWPTQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM46001QPWPTQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM46001QPWPTQ1?
LM46001QPWPTQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM46001QPWPTQ1 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 LM46001QPWPTQ1?
For technical support, including LM46001QPWPTQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM46001QPWPTQ1 requirements.
6.How does Aetrix verify that LM46001QPWPTQ1 is sourced from the original manufacturer or authorized distributors?
All LM46001QPWPTQ1 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 LM46001QPWPTQ1 meets industry standards.
7.What is the process for return or replacement of LM46001QPWPTQ1?
All LM46001QPWPTQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM46001QPWPTQ1, 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 LM46001QPWPTQ1 part is unused and in its original packaging.
Return procedure for LM46001QPWPTQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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