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Texas Instruments LM46002PWP
- Part No.:
- LM46002PWP
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM46002PWP.pdf
- Description:
- IC REG BUCK ADJ 2A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,831
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Product details
Overview
LM46002PWP from Texas Instruments is a 3.5-V to 60-V, 2-A synchronous step-down DC/DC converter in HTSSOP-16 (PWP) package. It delivers regulated output voltage with 27-µA quiescent current, adjustable 200 kHz–2.2 MHz switching frequency, and integrated power-good flag-used in industrial power supplies and automotive sub-AM band systems.
For engineers reviewing the LM46002PWP datasheet, LM46002PWP pinout, LM46002PWP application, or LM46002PWP equivalent, this page provides verified technical context, validated pin functions, confirmed EMI compliance (EN55022 Class B), real-world efficiency curves, and two rigorously cross-checked alternative parts for wide-input-voltage buck converter selection.
Technical Context
The LM46002PWP employs peak-current-mode control for stable loop compensation and cycle-by-cycle overcurrent protection. Its dual MOSFET power stage integrates high-side (210 mΩ) and low-side (110 mΩ) switches, enabling efficient operation across 3.5 V–60 V input range while supporting prebiased soft-start and output voltage tracking.
It features internal LDO bias generation (VCC = 3.2 V), optional BIAS rail connection for efficiency optimization, and programmable frequency via RT pin. Synchronization capability, precision enable thresholds (2.1 V typical), and thermal shutdown at 160°C support robust system-level integration in harsh environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - supports unregulated battery rails and industrial bus voltages without external pre-regulation. |
| Output Current | 2 A continuous - sufficient for FPGA core rails, microcontroller subsystems, and sensor hubs. |
| Quiescent Current | 27 µA in regulation - enables >90% efficiency at 1 mA load, critical for always-on monitoring circuits. |
| Switching Frequency | 200 kHz to 2.2 MHz adjustable - allows optimization between EMI performance and component size (e.g., smaller inductors at higher frequencies). |
| Feedback Reference | 1.011 V ±10 mV - ensures ±1% output accuracy across –40°C to +125°C junction temperature. |
| Thermal Shutdown | 160°C trip / 150°C recovery - provides safe fault recovery without latch-up in enclosed enclosures. |
| EMI Compliance | Meets EN55022 Class B radiated & conducted limits - reduces need for external filtering in commercial deployments. |
Pinout & Package
LM46002PWP 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 (PowerPAD™) for enhanced heat dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 SW | Switch node | Connects to both internal MOSFETs; requires low-inductance path to power inductor and COUT ground return. |
| 3 CBOOT | Bootstrap capacitor terminal | Supplies gate drive for high-side FET; must use 470-nF ceramic capacitor tied to SW. |
| 4 VCC | Internal bias supply output | Bypass with 1–10 µF capacitor to AGND; no external loading permitted. |
| 5 BIAS | Optional LDO input | Tie to VOUT (if 3.3–28 V) or external 3.3/5 V rail to improve light-load efficiency. |
| 6 SYNC | External clock input | Accepts 2–5.5 V logic; enables synchronization to system clock or noise-sensitive frequency bands. |
| 7 RT | Frequency programming | Resistor to AGND sets frequency (200 kHz–2.2 MHz); open circuit = 500 kHz default. |
| 8 PGOOD | Open-drain power-good flag | Signals valid output after soft-start; requires 10–100 kΩ pullup to ≤12 V logic rail. |
| 9 FB | Feedback sense input | Monitors resistor divider midpoint; 1.011 V reference enables precise output setting (e.g., 3.3 V, 5 V, 12 V). |
| 10 AGND | Analog ground reference | Ground for internal references and logic; separate from PGND but connected on PCB. |
| 11 SS/TRK | Soft-start & tracking control | Capacitor extends soft-start time; external ramp enables output voltage tracking during sequencing. |
| 12 EN | Enable input | Logic-high (>2.1 V) enables regulator; precision threshold allows programmable UVLO for system-level brownout protection. |
| 13,14 VIN | Main input supply | Connects to input capacitors and high-frequency bypass path; shortest possible trace to PGND required. |
| 15,16 PGND | Power ground | Low-side FET source connection; ties to PCB ground plane and thermal pad for thermal conduction. |
| PAD | Thermal pad | Internally connected to AGND; must be soldered to large copper area for RθJA = 38.9°C/W performance. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing solution size and improving full-load efficiency by up to 5% vs. asynchronous designs. |
| Discontinuous conduction mode (DCM) | Enables high light-load efficiency (<10 mA) without audible coil whine or output ripple degradation. |
| Internal soft-start (4.1 ms) | Prevents inrush current into bulk capacitance; extendable via external capacitor for multi-rail sequencing. |
| Output short-circuit protection with hiccup mode | Shuts down for 5.5 ms after 32 current-limit cycles, then retries-protects against sustained faults without thermal runaway. |
| Stable with diverse output capacitors | Works with ceramic, polymer, tantalum, and aluminum electrolytic capacitors-reduces BOM constraints and cost. |
Applications
| Industrial Power Supplies | Telecommunications Systems |
|---|---|
Use Scenario: DIN-rail mounted 24-V input power module converting to 5 V/2 A for PLC I/O modules and fieldbus gateways. IC Role / Device Role / Timing Role: Primary buck regulator delivering isolated downstream rails with EN-controlled sequencing and PGOOD status reporting. Use Value: 27-µA IQ enables standby operation during network sleep modes; EN threshold programmability supports coordinated system wake-up. | Use Scenario: Central office line card supplying 3.3 V/2 A to Ethernet PHYs and packet processors from a 48-V telecom bus. IC Role / Device Role / Timing Role: Point-of-load regulator with SYNC input synchronized to backplane clock to suppress beat frequencies in dense board layouts. Use Value: Meets EN55022 Class B radiated emissions without ferrite beads, reducing layout complexity and bill-of-materials cost. |
| Sub-AM Band Automotive | Commercial Vehicle Power Supplies |
Use Scenario: Infotainment head unit powering audio DSP and display controller from 12-V battery with cold-crank tolerance down to 3.5 V. IC Role / Device Role / Timing Role: Wide-VIN buck converter maintaining stable 5 V output during engine start transients, supported by precision EN UVLO. Use Value: 3.5-V minimum input and 160°C thermal shutdown ensure reliable operation in under-hood temperature extremes. | Use Scenario: Heavy-duty truck telematics gateway converting 24-V chassis battery to 12 V/2 A for GPS, cellular modem, and CAN transceivers. IC Role / Device Role / Timing Role: High-efficiency primary regulator with BIAS pin tied to 12-V output to reduce total system IQ below 30 µA. Use Value: Dual-MOSFET integration and thermal pad design sustain 2-A load at 85°C ambient without derating. |
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 |
|---|---|---|---|
| LM46001PWP | 1-A output current rating; identical pinout, package, and feature set except reduced current capability and lower RDS(on) values (HS: 180 mΩ, LS: 90 mΩ). | Suitable for lower-power loads where 2-A margin is unnecessary-reduces thermal stress and improves light-load efficiency. | Select when system load never exceeds 1 A and board space/layout reuse is prioritized over maximum current headroom. |
| LM43602PWP | 36-V max input (vs. 60 V); otherwise identical pinout, package, and functional features including PGOOD, SYNC, and soft-start. | Optimized for 24-V industrial and automotive systems where 60-V transient tolerance is not required-offers tighter parametric distribution and lower cost. | Choose for 12–36-V nominal inputs where EN55022 compliance and thermal performance match LM46002PWP but with simplified qualification. |
Compared with LM46002PWP, LM46001PWP trades 2-A capability for lower conduction loss at light loads, while LM43602PWP sacrifices 60-V input range for improved cost and consistency in mid-range voltage applications-both retain full pin compatibility and design reuse.
Availability
LM46002PWP is available at Aetrix Electronics and suitable for industrial power supplies, telecommunications systems, and sub-AM band automotive applications requiring stable component supply, long-term lifecycle support, and consistent parametric performance.
Supply support for LM46002PWP 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 decades of expertise in high-reliability DC/DC conversion.
The LM46002PWP belongs to TI's wide-input-voltage synchronous buck converter family, designed specifically for rugged industrial, automotive, and telecom power systems demanding high efficiency, low IQ, and robust EMI performance across extreme input ranges.
FAQ
What is the absolute maximum input voltage rating for the LM46002PWP?
The LM46002PWP has an absolute maximum input voltage rating of 65 V across VIN to PGND. This rating applies only for non-operational stress conditions; the recommended operating input voltage range remains 3.5 V to 60 V. Exceeding 65 V may cause permanent damage, and operation above 60 V is not guaranteed for functionality or reliability. The LM46002PWP datasheet specifies these limits in Section 6.1 Absolute Maximum Ratings.
Does the LM46002PWP support output voltage tracking during power-up sequencing?
Yes, the LM46002PWP supports output voltage tracking via its SS/TRK pin. When an external voltage ramp is applied to this pin, the device regulates its output to follow that ramp, enabling controlled sequencing with other rails. This function is explicitly documented in the Pin Functions table and Feature Description section of the LM46002PWP datasheet, and is distinct from internal soft-start which occurs when the pin is left floating.
What thermal performance can be expected from the LM46002PWP in a standard 4-layer PCB layout?
In a standard 4-layer PCB layout per JEDEC JESD51-7, the LM46002PWP achieves a junction-to-ambient thermal resistance (RθJA) of 38.9°C/W. This value assumes proper thermal pad soldering to an internal ground plane and accounts for 2 W power dissipation. Actual thermal performance depends on copper area, airflow, and adjacent heat sources-TI recommends using the exposed PowerPAD™ and minimizing thermal resistance to the PCB ground plane to maintain safe operation at full 2-A load.
Can the LM46002PWP operate with ceramic output capacitors only, without additional polymer or electrolytic types?
Yes, the LM46002PWP is explicitly characterized and stable with ceramic-only output capacitors. The datasheet states it is "stable with almost any combination of ceramic, polymer, tantalum, and aluminum capacitors," and typical application circuits (e.g., LM46002PWPEVM) use 150 µF ceramic arrays. No external compensation is required, and phase margin remains adequate across temperature and load due to internal compensation.
How does the LM46002PWP handle short-circuit faults on its output?
The LM46002PWP responds to output short-circuit faults using hiccup-mode protection. Upon detecting valley current limit violation, it disables switching for 5.5 ms after 32 consecutive current-limit cycles, then attempts automatic restart. This prevents thermal runaway and allows safe recovery once the fault clears-unlike latch-off protection, hiccup mode maintains system visibility and avoids manual reset requirements. This behavior is specified in Section 6.5 Electrical Characteristics under CURRENT LIMIT AND HICCUP parameters.
LM46002PWP 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:
- 2A
- 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
LM46002PWP FAQ
1.How can I place an order for LM46002PWP through Aetrix?
Please submit a Request for Quotation (RFQ) for LM46002PWP 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 LM46002PWP reliable?
The price and inventory of LM46002PWP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM46002PWP is usually 5 days.
3.What payment methods are accepted for LM46002PWP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM46002PWP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM46002PWP?
LM46002PWP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM46002PWP 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 LM46002PWP?
For technical support, including LM46002PWP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM46002PWP requirements.
6.How does Aetrix verify that LM46002PWP is sourced from the original manufacturer or authorized distributors?
All LM46002PWP 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 LM46002PWP meets industry standards.
7.What is the process for return or replacement of LM46002PWP?
All LM46002PWP units undergo pre-shipment inspection (PSI). If there is an issue with LM46002PWP, 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 LM46002PWP part is unused and in its original packaging.
Return procedure for LM46002PWP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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