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Texas Instruments LM46001QPWPRQ1
- Part No.:
- LM46001QPWPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM46001QPWPRQ1.pdf
- Description:
- IC REG BUCK ADJ 1A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,520
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Product details
Overview
LM46001QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC-DC converter delivering up to 1 A output current across a 3.5 V to 60 V input range, with 24 µA quiescent current in regulation, 500 kHz default switching frequency, and integrated power-good flag. It serves as the primary voltage regulator in 12 V/24 V automotive sub-AM band systems.
For engineers reviewing the LM46001QPWPRQ1 datasheet, LM46001QPWPRQ1 pinout, LM46001QPWPRQ1 application, or LM46001QPWPRQ1 equivalent, key selection criteria include wide-VIN operation under cold-crank conditions, EMI-compliant radiated emissions per EN55022 Class B, precision enable for system-level UVLO programming, and internal soft-start with tracking capability for multi-rail sequencing.
Technical Context
The LM46001QPWPRQ1 employs peak current mode control with fixed-frequency PWM, DCM, and PFM light-load modes to maintain high efficiency across 0–1 A load range. Its internal compensation eliminates external loop components, while programmable RT-based frequency (200 kHz–2.2 MHz) enables optimization for size or efficiency.
It integrates high-side (419 mΩ) and low-side (231 mΩ) MOSFETs, supports pre-biased soft-start, and features hiccup-mode short-circuit protection, thermal shutdown at 160°C, and ±305 mV enable hysteresis for robust system control in automotive environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - supports automotive cold-crank (≥4.5 V) and load-dump (≤60 V) transients without external protection. |
| Output Current | 1 A continuous - sufficient for powering infotainment SoCs, ADAS sensors, or gateway MCUs from 12 V/24 V rails. |
| Quiescent Current | 24 µA in regulation - enables always-on functionality in vehicle body electronics with minimal battery drain. |
| Switching Frequency | 200 kHz to 2.2 MHz (500 kHz default) - allows trade-off between inductor size (high-freq) and conduction loss (low-freq). |
| Feedback Reference | 1.016 V ±1.5% over –40°C to +125°C - ensures stable 1% output accuracy across automotive temperature range. |
| EMI Compliance | EN55022 Class B radiated emissions met - reduces need for external filtering in compact automotive PCB layouts. |
| Thermal Resistance | RθJA = 39.9°C/W - enables 1 A operation at +85°C ambient with standard 4-layer board and thermal pad soldered. |
Pinout & Package
LM46001QPWPRQ1 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 (PAD) connected internally to AGND for enhanced heat dissipation.
| 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. |
| CBOOT (3) | Bootstrap capacitor terminal | Provides gate drive voltage for high-side FET; requires 470 nF ceramic capacitor to SW for reliable bootstrapping. |
| VCC (4) | Internal LDO output | Bypassed to AGND; powers internal circuitry - no external load permitted; shorting to ground causes failure. |
| BIAS (5) | LDO input supply | Improves efficiency when tied to VOUT (3.3–28 V) or external rail; must be grounded if VOUT < 3.3 V. |
| SYNC (6) | External clock input | Enables synchronization to system clock (200 kHz–2.2 MHz); requires proper high-speed termination to prevent ringing. |
| RT (7) | Frequency set resistor | Resistor to AGND programs switching frequency; open circuit defaults to 500 kHz. |
| PGOOD (8) | Open-drain power-good flag | Signals valid output (±7% window around FB reference); requires 10–100 kΩ pull-up to logic rail ≤12 V. |
| FB (9) | Feedback sense input | Monitors output via resistive divider; 1.016 V reference sets VOUT = 1.016 × (1 + RFBT/RFBB). |
| AGND (10) | Analog ground reference | Ground for internal references and control logic - must be star-connected to PGND near device. |
| SS/TRK (11) | Soft-start / tracking control | Internal 4.1 ms soft-start when floating; external capacitor extends ramp time; voltage ramp enables output tracking. |
| EN (12) | Enable input | Logic-compatible enable with precision thresholds (2.1 V rising, 1.8 V falling) for system-level UVLO control. |
| VIN (13, 14) | Main input supply | Connects to bulk input capacitors; dual pins reduce IR drop and improve thermal performance. |
| PGND (15, 16) | Power ground return | Low-side FET source connection; must be tightly coupled to CIN and COUT grounds with minimal trace length. |
| PAD | Thermal pad | Internally connected to AGND; primary heat path - must be soldered to large PCB copper area for thermal reliability. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C TJ) - certified for engine bay and cabin electronics deployment. |
| Synchronous rectification | Integrated 419 mΩ HS / 231 mΩ LS MOSFETs - eliminates external diode, improves full-load efficiency by ≥5% vs. asynchronous designs. |
| Light-load efficiency mode | Automatic transition to DCM/PFM - maintains >85% efficiency at 1 mA load, critical for always-on modules. |
| Internal compensation | No external compensation network required - reduces BOM count and design iteration time for stable loop response. |
| Pre-biased soft-start | Safe startup into pre-charged output - prevents reverse current flow in multi-rail systems with powered-down downstream ICs. |
| Output voltage tracking | SS/TRK pin accepts external ramp - enables coordinated sequencing with other regulators in complex power trees. |
Applications
| Automotive Infotainment Power Supply | Commercial Vehicle Telematics Module |
|---|---|
Use Scenario: Powers DSP, display controller, and audio codec in head-unit systems operating from 12 V battery with cold-crank dips to 4.5 V. IC Role / Device Role: Primary buck regulator generating 3.3 V/1 A rail with tight output tolerance and low noise. Use Value: Maintains regulation during cranking events and meets CISPR-25 Class 5 radiated emission limits without added shielding. |
Use Scenario: Supplies 5 V to GPS receiver, cellular modem, and CAN transceiver in fleet management telematics units. IC Role / Device Role: Wide-input buck converter with precision enable for controlled power-up sequence after ignition detection. Use Value: Enables wake-on-CAN functionality with 24 µA quiescent current and hiccup-mode short-circuit protection for field reliability. |
| ADAS Camera Power Management | Industrial Gateway Controller |
Use Scenario: Provides clean 12 V bias to CMOS image sensor and 1.8 V to ISP in rear-view camera modules mounted in hot trunk environments. IC Role / Device Role: Dual-output solution using tracking (SS/TRK) and external feedback divider to generate sequenced rails. Use Value: Thermal shutdown at 160°C and RθJA = 39.9°C/W ensure uninterrupted operation at +85°C ambient. |
Use Scenario: Regulates 24 V industrial bus down to 3.3 V for ARM Cortex-M7 MCU, Ethernet PHY, and RS-485 transceivers. IC Role / Device Role: High-reliability buck converter with EN-controlled sequencing and PGOOD monitoring for firmware safety checks. Use Value: Meets EN55022 Class B emissions in unshielded enclosures and supports 2.2 MHz operation to shrink filter size. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM46002QPWPRQ1 | 2 A output current rating; identical pinout and feature set; higher RDS(on) (HS: 470 mΩ, LS: 250 mΩ). | Required where sustained >1 A load or higher peak current margin is needed (e.g., motor driver bias rails). | Select when higher current headroom is mandatory; same PCB layout but verify thermal margin at full load. |
| LM43603QPWPRQ1 | 3.5–36 V input range; 3 A output; pin-to-pin compatible; lower max VIN limits system use in 48 V architectures. | Suitable for 24 V-only commercial vehicles or telecom systems without 48 V/60 V transients. | Choose for cost-sensitive 24 V applications needing >1 A; not viable for 48 V battery systems or load-dump survival. |
Compared with LM46002QPWPRQ1 and LM43603QPWPRQ1, the LM46001QPWPRQ1 uniquely balances 60 V input capability, 1 A output, and ultra-low 24 µA quiescent current-making it optimal for space-constrained, always-on automotive subsystems where input voltage range and standby power are critical.
Availability
LM46001QPWPRQ1 is available at Aetrix Electronics and suitable for automotive infotainment, commercial vehicle telematics, and ADAS camera power supplies requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LM46001QPWPRQ1 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.
The LM46001QPWPRQ1 belongs to TI's automotive-qualified DC-DC buck converter family, designed specifically for demanding 12 V/24 V/48 V vehicle electrical systems requiring high reliability, low quiescent current, and EMI compliance.
FAQ
What is the minimum input voltage required for the LM46001QPWPRQ1 to start switching?
The LM46001QPWPRQ1 requires a minimum input voltage of 3.8 V to initiate startup and enter regulation. Below this threshold, the device remains in shutdown with only 2.3–5 µA quiescent current. This ensures reliable operation during automotive cold-crank events where battery voltage may dip to 4.5 V, while maintaining sufficient headroom for internal LDO biasing.
Does the LM46001QPWPRQ1 support output voltage tracking, and how is it implemented?
Yes, the LM46001QPWPRQ1 supports output voltage tracking via the SS/TRK pin. When an external voltage ramp (e.g., from another regulator's soft-start pin) is applied to SS/TRK, the LM46001QPWPRQ1's internal soft-start circuit follows that ramp, enabling precise sequencing of multiple power rails. This avoids bus contention and inrush current issues in complex multi-voltage systems.
How does the LM46001QPWPRQ1 handle short-circuit conditions on the output?
The LM46001QPWPRQ1 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 runaway. The device cycles until the fault clears, with no latch-off - ensuring automatic recovery without manual reset in transient fault scenarios.
Can the LM46001QPWPRQ1 operate with ceramic output capacitors, and what is the stability requirement?
Yes, the LM46001QPWPRQ1 is internally compensated and stable with ceramic, polymer, tantalum, and aluminum electrolytic output capacitors - no external type restrictions. Its control loop is optimized for low-ESR ceramics (e.g., 100 µF X5R), eliminating the need for minimum ESR requirements that complicate capacitor selection in automotive designs.
What is the purpose of the BIAS pin on the LM46001QPWPRQ1, and when should it be used?
The BIAS pin on the LM46001QPWPRQ1 provides an optional input to the internal LDO, improving conversion efficiency by 2–3% when tied to VOUT (for 3.3–28 V outputs) or an external 3.3 V/5 V rail. If unused (e.g., VOUT < 3.3 V), it must be grounded - floating the pin risks erratic operation or increased quiescent current.
LM46001QPWPRQ1 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
LM46001QPWPRQ1 FAQ
1.How can I place an order for LM46001QPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM46001QPWPRQ1 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 LM46001QPWPRQ1 reliable?
The price and inventory of LM46001QPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM46001QPWPRQ1 is usually 5 days.
3.What payment methods are accepted for LM46001QPWPRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM46001QPWPRQ1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM46001QPWPRQ1?
LM46001QPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM46001QPWPRQ1 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 LM46001QPWPRQ1?
For technical support, including LM46001QPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM46001QPWPRQ1 requirements.
6.How does Aetrix verify that LM46001QPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM46001QPWPRQ1 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 LM46001QPWPRQ1 meets industry standards.
7.What is the process for return or replacement of LM46001QPWPRQ1?
All LM46001QPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM46001QPWPRQ1, 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 LM46001QPWPRQ1 part is unused and in its original packaging.
Return procedure for LM46001QPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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