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Texas Instruments LM46001PWP
- Part No.:
- LM46001PWP
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM46001PWP.pdf
- Description:
- IC REG BUCK ADJ 1A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:917
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Product details
Overview
LM46001PWP from Texas Instruments is a 3.5-V to 60-V, 1-A synchronous step-down DC-DC converter in a 16-pin HTSSOP package (6.6 mm × 5.1 mm). It delivers up to 1 A output current with 24-µA quiescent current in regulation, adjustable switching frequency from 200 kHz to 2.2 MHz, and integrated synchronous rectification. It is used in industrial power supplies and automotive sub-AM band systems requiring wide-input-voltage regulation.
For engineers reviewing the LM46001PWP datasheet, LM46001PWP pinout, LM46001PWP application, or LM46001PWP equivalent, key selection considerations include its EN-controlled precision UVLO (2.1 V typical), internal soft-start (4.1 ms), PGOOD flag, and compliance with EN55022 Class B radiated emissions limits - all validated on the LM46001PWPEVM with default BOM.
Technical Context
The LM46001PWP employs peak-current-mode control with discontinuous conduction mode (DCM) and pulse-frequency modulation (PFM) at light loads to maintain high efficiency across 0–1 A. Its internal compensation eliminates external loop components, while the RT pin enables precise frequency programming (200 kHz–2.2 MHz) or synchronization to an external clock within the same range.
It integrates dual MOSFETs (RDS(on)-HS = 419 mΩ, RDS(on)-LS = 231 mΩ), a precision 1.016-V feedback reference (±12 mV over –40°C to +125°C), and hiccup-mode short-circuit protection triggered by valley current limit (1.1 A min). Thermal shutdown activates at 160°C with 10°C hysteresis, and the exposed thermal pad (PAD) provides primary heat dissipation path to PCB ground plane.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - supports unregulated 12 V/24 V/36 V/48 V/60 V rails without pre-regulation |
| Output Current | 1 A continuous - sufficient for point-of-load regulation of microcontrollers, FPGAs, and sensors |
| Quiescent Current | 24 µA in regulation - enables >10-year battery life in always-on industrial monitoring nodes |
| Switching Frequency | 200 kHz to 2.2 MHz (default 500 kHz) - allows trade-off between EMI filtering size and efficiency |
| Feedback Reference | 1.016 V ±12 mV (–40°C to +125°C) - enables accurate output voltage setting with <±1% error over temperature |
| Power-Good Flag | Open-drain PGOOD with 110%/90% FB threshold hysteresis - provides reliable system power sequencing |
| Thermal Shutdown | 160°C activation / 150°C recovery - protects against sustained overload or poor heatsinking |
Pinout & Package
LM46001PWP is housed in a thermally enhanced 16-pin HTSSOP (PWP) package measuring 6.6 mm × 5.1 mm × 1.2 mm with 0.65-mm lead pitch and an exposed thermal pad (PAD) connected internally to AGND for PCB-level heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch node | Connects to both internal MOSFETs and external inductor; high di/dt path requiring minimal loop area |
| 3 CBOOT | Bootstrap capacitor connection | Requires 470-nF ceramic cap to SW; enables high-side gate drive above VIN |
| 4 VCC | Internal LDO output | Bypass with capacitor to AGND; powers internal circuitry; no external load permitted |
| 5 BIAS | Optional LDO input | Tie to VOUT (3.3–28 V) or external 3.3/5 V rail to improve efficiency; bypass with 1–10 µF |
| 6 SYNC | External clock input | Accepts 200 kHz–2.2 MHz square wave; requires proper termination to prevent ringing |
| 7 RT | Frequency programming | Resistor to AGND sets frequency; open-circuit = 500 kHz default |
| 8 PGOOD | Power-good flag | Open-drain output; requires 10–100 kΩ pull-up; asserts when VOUT is within ±10% of target |
| 9 FB | Feedback sense | Connects to resistor divider midpoint; 1.016-V reference sets VOUT = 1.016 × (1 + RFBT/RFBB) |
| 10 AGND | Analog ground | Reference for internal references and logic; connect directly to system ground plane |
| 11 SS/TRK | Soft-start / tracking | Float for 4.1-ms internal soft-start; add capacitor to extend time; apply external ramp for voltage tracking |
| 12 EN | Enable input | Logic-high (>2.1 V) enables regulator; precision UVLO allows programmable system brownout threshold |
| 13, 14 VIN | Main input supply | Connect to input capacitors (CIN); shortest possible path to PGND minimizes EMI |
| 15, 16 PGND | Power ground | Internal low-side FET source; tie to AGND, PAD, CIN, and COUT grounds with low-inductance layout |
| PAD | Thermal pad | Internally connected to AGND; must be soldered to large PCB copper area for thermal performance |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing solution size and improving full-load efficiency by ~3–5% |
| EN-controlled precision UVLO | 2.1 V enable threshold with 305-mV hysteresis enables robust system-level undervoltage lockout without external comparators |
| Internal soft-start + extendable timing | 4.1-ms fixed soft-start prevents inrush; external capacitor on SS/TRK pin allows user-defined ramp duration |
| EMI-compliant design | Meets EN55022 Class B radiated emissions limits per LM46001PWPEVM test data - reduces need for external filters |
| Stable with diverse output capacitors | Supports ceramic, polymer, tantalum, and aluminum electrolytic capacitors - simplifies BOM and sourcing |
| Hiccup-mode short-circuit protection | Enters 5.5-ms retry cycle after LS current limit trip (1.1 A min), limiting fault energy and enabling self-recovery |
Applications
| Industrial Power Supplies | Telecommunications Systems |
|---|---|
Use Scenario: 24-V DC distribution in PLC I/O modules with variable load profiles and ambient temperatures up to 85°C. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3 V or 5 V to microcontroller, ADC, and isolated communication interfaces. Use Value: 24-µA quiescent current extends uptime during standby; EN pin enables remote power cycling via fieldbus signal. |
Use Scenario: Intermediate bus conversion in 48-V telecom shelf systems powering baseband processors and RF front-end bias rails. IC Role / Device Role / Timing Role: Point-of-load regulator stepping 48 V down to 12 V or 5 V with tight transient response and low noise. Use Value: Adjustable 200 kHz–2.2 MHz switching frequency avoids sensitive IF bands; PGOOD ensures clean power sequencing before FPGA configuration. |
| Sub-AM Band Automotive | Commercial Vehicle Power Supplies |
Use Scenario: Infotainment head unit powered from 12-V battery with cold-crank (4.5 V) and load-dump (60 V) transients. IC Role / Device Role / Timing Role: Wide-VIN buck converter supplying 5 V to display controller and audio codec with hiccup-mode fault handling. Use Value: 3.5–60 V input range withstands automotive transients; internal soft-start prevents reset during ignition cycles. |
Use Scenario: Onboard diagnostics module in heavy-duty trucks using 24-V chassis battery with high EMI environment. IC Role / Device Role / Timing Role: Regulator generating 3.3 V for CAN transceivers and sensor interface ICs in vibration-prone enclosures. Use Value: EN pin tied to ignition switch; meets EN55022 Class B emissions without shielding; thermal pad ensures reliability at 125°C junction. |
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 |
|---|---|---|---|
| LM46002PWP | 0.5-A output current rating; identical pinout, package, and feature set except reduced current capability and higher RDS(on) | Suitable only for lower-power loads (<500 mA); not interchangeable under 1-A load conditions | Select LM46002PWP only when load current is confirmed ≤0.5 A and board space reuse is critical |
| LM43603PWP | 3-A output current; same 16-pin HTSSOP package but higher RDS(on) (HS: 120 mΩ, LS: 65 mΩ) and different thermal characteristics | Designed for higher-current applications; requires revalidation of thermal layout and output capacitor ESR | Choose LM43603PWP only when ≥2.5 A output is required and thermal margin permits higher power dissipation |
Compared with LM46002PWP and LM43603PWP, the LM46001PWP uniquely balances 1-A capability, ultra-low IQ (24 µA), and EN55022 compliance in a compact HTSSOP footprint - making it optimal for mid-power industrial and automotive systems where efficiency, size, and EMI are co-constrained.
Availability
LM46001PWP is available at Aetrix Electronics and suitable for industrial power supplies, telecommunications systems, and commercial vehicle power supplies requiring stable component supply, long-term manufacturability, and automotive-grade reliability.
Supply support for LM46001PWP 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 technologies with over 50 years of innovation in high-reliability power conversion.
The LM46001PWP belongs to TI's wide-input-voltage synchronous buck converter family, designed specifically for rugged industrial, automotive, and telecom applications demanding high efficiency, small solution size, and robust protection features across extreme input voltage ranges.
FAQ
What is the minimum input voltage required for the LM46001PWP to start switching?
The LM46001PWP requires a minimum input voltage of 3.8 V to initiate startup and enter regulation. This value accounts for internal undervoltage lockout margins and ensures reliable turn-on across temperature and process variation. Below 3.8 V, the device remains in shutdown regardless of EN pin state. The LM46001PWP maintains regulation down to 3.5 V once operating, but startup is guaranteed only above 3.8 V per datasheet specification.
Does the LM46001PWP support output voltage tracking during power-up sequences?
Yes, the LM46001PWP 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 LM46001PWP's output follows that ramp with unity gain. This enables precise sequencing of multiple rails in complex systems. Tracking behavior is active only during startup; the pin defaults to internal soft-start if left floating or connected to a capacitor.
How does the LM46001PWP achieve EN55022 Class B radiated emissions compliance?
The LM46001PWP achieves EN55022 Class B compliance through optimized internal gate drive timing, integrated synchronous rectification (eliminating diode reverse recovery noise), and a pinout layout that minimizes high-di/dt loop area. Radiated emissions testing was performed on the LM46001PWPEVM with default BOM and no input filter, confirming compliance in both horizontal and vertical polarization - enabling simpler system-level EMI design.
Can the LM46001PWP operate with a 3.3-V output and 12-V input while maintaining high efficiency at light load?
Yes, the LM46001PWP maintains high efficiency at light load (e.g., 10 mA) under 12-V input and 3.3-V output conditions by automatically entering pulse-frequency modulation (PFM) mode. In PFM, switching frequency drops below 200 kHz, reducing switching losses. Measured efficiency exceeds 85% at 10 mA load, enabled by 24-µA quiescent current and low RDS(on) MOSFETs - verified in Figure 3 of the datasheet.
What is the role of the BIAS pin on the LM46001PWP, and how should it be configured?
The BIAS pin on the LM46001PWP supplies the internal LDO that powers the control circuitry. For highest efficiency, TI recommends connecting BIAS to VOUT when VOUT is between 3.3 V and 28 V. If VOUT is outside this range (e.g., <3.3 V), tie BIAS to ground. Do not leave BIAS floating. A 1–10 µF bypass capacitor must be placed between BIAS and AGND when used, as specified in the Pin Functions table.
LM46001PWP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- SIMPLE SWITCHER®
- Package/Case:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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:
- 1A
- Frequency - Switching:
- 200kHz ~ 2.2MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM46001PWP FAQ
1.How can I place an order for LM46001PWP through Aetrix?
Please submit a Request for Quotation (RFQ) for LM46001PWP 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 LM46001PWP reliable?
The price and inventory of LM46001PWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM46001PWP is usually 5 days.
3.What payment methods are accepted for LM46001PWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM46001PWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM46001PWP?
LM46001PWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM46001PWP 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 LM46001PWP?
For technical support, including LM46001PWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM46001PWP requirements.
6.How does Aetrix verify that LM46001PWP is sourced from the original manufacturer or authorized distributors?
All LM46001PWP 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 LM46001PWP meets industry standards.
7.What is the process for return or replacement of LM46001PWP?
All LM46001PWP units undergo pre-shipment inspection (PSI). If there is an issue with LM46001PWP, 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 LM46001PWP part is unused and in its original packaging.
Return procedure for LM46001PWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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