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Texas Instruments LM46002PWPT
- Part No.:
- LM46002PWPT
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM46002PWPT.pdf
- Description:
- IC REG BUCK ADJ 2A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,799
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Product details
Overview
LM46002PWPT 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 high efficiency across wide load range using peak-current-mode control, features internal compensation, power-good flag, and soft-start into prebiased loads - deployed in industrial power supplies and automotive sub-AM band systems.
For engineers reviewing the LM46002PWPT datasheet, LM46002PWPT pinout, LM46002PWPT application, or LM46002PWPT equivalent, key selection considerations include its 27-µA quiescent current in regulation, EN pin precision UVLO (2.1 V typ), 500-kHz default switching frequency, and EN55022 Class B radiated EMI compliance without external filters.
Technical Context
The LM46002PWPT employs peak-current-mode control with cycle-by-cycle current limiting and internal slope compensation, enabling stable operation with minimal external components. Its integrated high-side (210 mΩ) and low-side (110 mΩ) MOSFETs support up to 2 A continuous output current while maintaining <1.030 V feedback reference tolerance over –40°C to +125°C.
It supports flexible system integration via SYNC input for external clock synchronization (200 kHz–2.2 MHz), SS/TRK pin for soft-start extension or voltage tracking, and BIAS pin for optional LDO input tie to VOUT (3.3–28 V) to improve light-load efficiency. Thermal shutdown triggers at 160°C with 10°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 60 V - enables single-supply operation across 12 V, 24 V, 36 V, and 48 V industrial and vehicle battery rails. |
| Output Current | 2 A continuous - sufficient for FPGA core rails, microcontroller subsystems, and sensor signal chains. |
| Quiescent Current | 27 µA in regulation - extends battery life in always-on industrial monitoring nodes. |
| Switching Frequency | 200 kHz to 2.2 MHz adjustable (500 kHz default) - allows optimization of size vs. efficiency and EMI filtering requirements. |
| Feedback Reference | 1.011 V ±10 mV (typ) - ensures ±1% output accuracy with standard resistor dividers. |
| EMI Compliance | Meets EN55022/CISPR 22 Class B radiated emissions - reduces need for external EMI filters in space-constrained designs. |
| Thermal Shutdown | 160°C trip / 150°C recovery - protects against sustained overload or poor PCB heatsinking. |
Pinout & Package
LM46002PWPT 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 thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1,2 SW | Switch node | Connects to inductor; carries high di/dt switching current - requires short, low-inductance layout to minimize EMI and voltage spikes. |
| 3 CBOOT | Bootstrap capacitor connection | Supplies gate drive for high-side MOSFET; requires 470-nF ceramic capacitor tied between CBOOT and SW. |
| 4 VCC | Internal bias supply output | Bypass with 1–10 µF capacitor to AGND; no external loading permitted - powers internal logic and gate drivers. |
| 5 BIAS | Optional LDO input | Tie to VOUT (3.3–28 V) or external 3.3/5 V rail to reduce VIN current draw and improve light-load efficiency. |
| 6 SYNC | External clock input | Accepts 200 kHz–2.2 MHz square wave; enables synchronized multi-rail systems and EMI spreading. |
| 7 RT | Frequency programming | Resistor to AGND sets switching frequency; open circuit = 500 kHz default. |
| 8 PGOOD | Open-drain power-good flag | Asserts high when VOUT is within ±12% of target; requires 10–100 kΩ pullup to ≤12 V logic rail. |
| 9 FB | Feedback sense input | Monitors resistive divider output; 1.011 V reference enables precise output voltage setting (e.g., 3.3 V, 5 V, 12 V). |
| 10 AGND | Analog ground reference | Reference for internal references and logic; must connect to system ground with low-impedance path. |
| 11 SS/TRK | Soft-start and tracking control | Capacitor extends soft-start time; external ramp enables output voltage tracking during power sequencing. |
| 12 EN | Enable input | Logic-high (>2.1 V) enables regulator; precision threshold allows programmable system UVLO. |
| 13,14 VIN | Main input supply | Connects to input capacitors (CIN); dual pins reduce IR drop and improve high-frequency decoupling. |
| 15,16 PGND | Power ground | Low-side MOSFET source return; connects to AGND, PAD, and all power capacitor grounds - critical for EMI and thermal performance. |
| PAD | Exposed thermal pad | Internally connected to AGND; must be soldered to large PCB copper area for thermal conduction and EMI shielding. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode - reduces solution size and improves full-load efficiency by ~3–5% versus asynchronous designs. |
| Discontinuous conduction mode (DCM) + PFM at light load | Maintains >85% efficiency at 1 mA load - essential for IoT sensors and standby power domains. |
| Internal soft-start (4.1 ms) + extendable via capacitor | Prevents inrush current and output overshoot; external capacitor allows tuning from 4.1 ms to >100 ms for multi-rail sequencing. |
| Output short-circuit protection with hiccup mode | Enters 5.5-ms retry cycle after fault detection - prevents thermal runaway while allowing automatic recovery. |
| Stable with ceramic, polymer, tantalum, aluminum capacitors | No ESR requirement - simplifies BOM and enables use of low-ESR MLCCs for compact, high-reliability designs. |
Applications
| Industrial Power Supplies | Telecommunications Systems |
|---|---|
|
Use Scenario: Distributed 24-V DC distribution powering PLC I/O modules, field transmitters, and HART-enabled sensors. IC Role / Device Role / Timing Role: Primary point-of-load regulator converting 24 V to 3.3 V/5 V for microcontrollers and analog front-ends. Use Value: 27-µA quiescent current enables >10-year battery backup life; EN pin UVLO ensures clean startup during brownout conditions. |
Use Scenario: Intermediate bus conversion in 48-V telecom equipment feeding DSPs, FPGAs, and SerDes PHYs. IC Role / Device Role / Timing Role: High-efficiency buck stage delivering 1.2 V/1.8 V/3.3 V from 48 V intermediate rail. Use Value: Meets EN55022 Class B radiated EMI without ferrite beads - reduces board area and cost in dense backplane layouts. |
| Sub-AM Band Automotive | Commercial Vehicle Power Supplies |
|
Use Scenario: Infotainment head unit power management where input voltage ranges from cold-crank (4.5 V) to load-dump (60 V). IC Role / Device Role / Timing Role: Input-hardened buck converter supplying 5 V for USB ports and display controllers. Use Value: 60-V absolute max input rating and hiccup-mode short-circuit protection ensure robustness against automotive transients. |
Use Scenario: Powering telematics gateways and ADAS camera modules in trucks and buses with 24-V nominal battery systems. IC Role / Device Role / Timing Role: Wide-input buck regulator generating 3.3 V for CAN FD transceivers and image processors. Use Value: SYNC pin enables phase alignment with other rails to suppress beat frequencies; BIAS pin improves efficiency at partial load. |
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 |
|---|---|---|---|
| LM46001PWPT | 1-A output current rating; identical pinout, package, and feature set except lower current capability and reduced RDS(on) (HS: 180 mΩ, LS: 95 mΩ). | Suitable for lower-power subsystems (e.g., MCU-only rails) where 2-A headroom is unnecessary. | Select LM46001PWPT when load current stays below 1 A and board space reuse is prioritized. |
| LM43602PWPT | 36-V max input (vs. 60 V); same 2-A rating, HTSSOP-16 package, and functional pinout; shares most features but lacks BIAS pin. | Targeted at 12/24-V industrial systems without load-dump risk - not suitable for 48-V or automotive cold-crank. | Choose LM43602PWPT for cost-sensitive 24-V applications where 60-V rating is unnecessary and BIAS functionality is unused. |
Compared with LM46001PWPT and LM43602PWPT, the LM46002PWPT uniquely combines 60-V input tolerance, 2-A output, and BIAS pin efficiency optimization - making it the only option among the three for ruggedized 48-V telecom or automotive front-end regulation.
Availability
LM46002PWPT is available at Aetrix Electronics and suitable for industrial power supplies, telecommunications systems, and commercial vehicle power supplies requiring stable component supply, long-term lifecycle support, and consistent parametric performance across temperature and input voltage extremes.
Supply support for LM46002PWPT 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 decades of expertise in high-reliability DC/DC conversion.
The LM46002PWPT belongs to TI's wide-input synchronous buck regulator family designed for demanding industrial, automotive, and telecom applications where input voltage variation, efficiency, and EMI compliance are critical design constraints.
FAQ
What is the minimum input voltage required for the LM46002PWPT to start switching?
The LM46002PWPT requires a minimum input voltage of 3.8 V to initiate startup and enter regulation. This threshold ensures reliable turn-on of internal circuitry including the VCC LDO and gate drivers. Below this level, the device remains in shutdown regardless of EN pin state. The LM46002PWPT maintains regulation down to 3.5 V once started, supporting brownout operation in battery-powered systems.
Does the LM46002PWPT support output voltage tracking during power-up sequencing?
Yes, the LM46002PWPT 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 LM46002PWPT's output follows that ramp with unity gain. This enables precise power sequencing in multi-rail systems such as FPGAs or processors with strict voltage ramp order requirements - without requiring additional tracking ICs.
How does the BIAS pin improve efficiency in the LM46002PWPT?
The BIAS pin on the LM46002PWPT allows the internal LDO to be powered from VOUT (3.3–28 V) instead of VIN, reducing input current draw and conduction losses in the high-side MOSFET. When BIAS is tied to VOUT, the LM46002PWPT achieves higher light-load efficiency - particularly beneficial in systems where the output voltage is ≥3.3 V and stable during operation.
What is the purpose of the exposed thermal pad (PowerPAD™) on the LM46002PWPT package?
The exposed thermal pad on the LM46002PWPT serves as the primary thermal conduction path from the die to the PCB. It is internally connected to AGND and must be soldered to a large copper pour on the board for effective heat dissipation. Proper pad layout reduces junction-to-board thermal resistance (RθJB = 19.9°C/W) and prevents thermal shutdown under sustained 2-A loads.
Can the LM46002PWPT synchronize to an external clock while operating at 2.2 MHz?
Yes, the LM46002PWPT supports external clock synchronization across its full 200 kHz to 2.2 MHz frequency range via the SYNC pin. At 2.2 MHz, the device accepts a square-wave clock with 10%–90% duty cycle, 2-V high threshold, and 0.4-V low threshold. This enables precise timing alignment in multi-phase or noise-sensitive systems without compromising maximum switching frequency capability.
LM46002PWPT 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:
- 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
LM46002PWPT FAQ
1.How can I place an order for LM46002PWPT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM46002PWPT 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 LM46002PWPT reliable?
The price and inventory of LM46002PWPT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM46002PWPT is usually 5 days.
3.What payment methods are accepted for LM46002PWPT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM46002PWPT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM46002PWPT?
LM46002PWPT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM46002PWPT 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 LM46002PWPT?
For technical support, including LM46002PWPT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM46002PWPT requirements.
6.How does Aetrix verify that LM46002PWPT is sourced from the original manufacturer or authorized distributors?
All LM46002PWPT 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 LM46002PWPT meets industry standards.
7.What is the process for return or replacement of LM46002PWPT?
All LM46002PWPT units undergo pre-shipment inspection (PSI). If there is an issue with LM46002PWPT, 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 LM46002PWPT part is unused and in its original packaging.
Return procedure for LM46002PWPT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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