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Texas Instruments LM43603PWPR
- Part No.:
- LM43603PWPR
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43603PWPR.pdf
- Description:
- IC REG BUCK ADJ 3A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,291
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Product details
Overview
LM43603PWPR from Texas Instruments is a 3.5-V to 36-V, 3-A synchronous step-down DC-DC converter in HTSSOP-16 (PWP) package. It delivers high efficiency across load range via DCM/PEM light-load operation, integrates synchronous rectification and internal compensation, and supports EN55022 Class B radiated EMI compliance - used in industrial power supplies and automotive sub-AM band systems.
For engineers reviewing the LM43603PWPR datasheet, LM43603PWPR pinout, LM43603PWPR application, or LM43603PWPR equivalent, key selection factors include its 27-µA quiescent current in regulation, adjustable 200 kHz–2.2 MHz switching frequency, precision enable with 2.2 V threshold, soft-start into pre-biased loads, and power-good flag with 6% hysteresis.
Technical Context
The LM43603PWPR employs peak current mode control for stable loop compensation and cycle-by-cycle current limiting. Its integrated synchronous FETs feature RDS(on) of 120 mΩ (HS) and 65 mΩ (LS) at 1 A, enabling high-efficiency conversion without external diodes.
It supports frequency synchronization via SYNC pin (2–5.5 V logic levels), programmable switching frequency using RT-to-AGND resistor, and output voltage tracking via SS/TRK pin - all while maintaining stability with ceramic, polymer, tantalum, or aluminum output capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports wide-input industrial and automotive battery-supplied systems |
| Output Current | Up to 3 A continuous - sufficient for point-of-load regulation in FPGA, DSP, and microcontroller rails |
| Quiescent Current | 27 µA in regulation - enables ultra-low standby power in always-on subsystems |
| Switching Frequency | 200 kHz to 2.2 MHz adjustable - allows optimization for size (high-freq) or efficiency (low-freq) |
| Feedback Reference | 1.011 V ±1.2% over –40°C to +125°C - ensures accurate output voltage regulation across temperature |
| Power-Good Flag | Open-drain PGOOD with 113% OV / 88% UV thresholds and 6% hysteresis - provides reliable system sequencing and fault detection |
| Thermal Shutdown | 160°C shutdown / 150°C recovery - protects against sustained overload or poor heatsinking |
Pinout & Package
LM43603PWPR uses the HTSSOP-16 (PWP) package: 5.1 mm × 6.6 mm × 1.2 mm body, with exposed thermal pad connected internally to AGND. Pin 1–16 follow standard top-view numbering; pins 15–16 are PGND, pin 10 is AGND, and the thermal pad must be soldered to PCB ground plane for thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2) | Switch node | Connects to inductor; carries high dv/dt switching waveform - requires short, low-inductance layout |
| CBOOT (3) | Bootstrap capacitor connection | Supplies gate drive for high-side MOSFET; requires 470-nF ceramic capacitor to SW |
| VCC (4) | Internal LDO output | Bypass with capacitor to AGND; no external loading permitted |
| BIAS (5) | LDO input supply | Tie to VOUT (if 3.3–28 V) or external rail for improved efficiency; bypass with 1–10 µF |
| SYNC (6) | External clock input | Accepts 2–5.5 V sync signal; terminate properly to prevent ringing |
| RT (7) | Frequency programming | Resistor to AGND sets frequency; open circuit = 500 kHz default |
| PGOOD (8) | Power-good flag | Open-drain output; requires 10–100 kΩ pullup to ≤12 V logic rail |
| FB (9) | Feedback sense | Connects to resistor divider midpoint; 1.011 V reference sets output voltage |
| AGND (10) | Analog ground | Reference for internal references and logic; connect directly to system ground |
| SS/TRK (11) | Soft-start / tracking control | Internal 4.1 ms soft-start when floating; add capacitor to extend or voltage ramp for tracking |
| EN (12) | Enable input | Logic-level enable with 2.2 V rising threshold and 290 mV hysteresis - enables precise UVLO |
| VIN (13,14) | Main input supply | Connect to input capacitor bank; shortest possible path to PGND and CIN required |
| PGND (15,16) | Power ground | Low-side FET source connection; tie to system ground, CIN/COUT grounds, and thermal pad |
| PAD | Thermal pad | Internally connected to AGND; must be soldered to PCB ground plane for heat dissipation |
Key Features
| Feature | Design Value |
|---|---|
| Integrated synchronous rectification | Eliminates external Schottky diode, reducing conduction loss and board area |
| Internal compensation | Reduces external component count and simplifies design - no loop compensation components needed |
| Stable with diverse output capacitors | Supports ceramic, polymer, tantalum, and aluminum capacitors - increases flexibility in cost/performance tradeoffs |
| Pre-biased soft-start | Allows safe startup into powered output rails - prevents reverse current flow during power-up |
| EMI-compliant design | Meets EN55022 Class B radiated emissions without added filtering - reduces system-level EMI mitigation effort |
Applications
| Industrial Power Supplies | Telecommunications Systems |
|---|---|
Use Scenario: 24-V DC distribution powering field I/O modules and PLC backplanes. IC Role / Device Role / Timing Role: Primary buck regulator delivering stable 3.3 V or 5 V to microcontrollers and interface ICs. Use Value: 27-µA quiescent current extends uptime in battery-backed systems; 36-V max input handles brownouts and transients. | Use Scenario: Intermediate bus conversion in 48-V telecom equipment feeding point-of-load regulators. IC Role / Device Role / Timing Role: Wide-VIN step-down stage converting 48 V to 12 V or 5 V for downstream POL converters. Use Value: Adjustable 200 kHz–2.2 MHz frequency avoids noise-sensitive bands; EN55022 compliance simplifies EMC certification. |
| Sub-AM Band Automotive | High Efficiency Point-Of-Load Regulation |
Use Scenario: Powering infotainment head units and ADAS sensors from 12-V battery with cold-crank tolerance. IC Role / Device Role / Timing Role: Primary DC-DC regulator supporting 3.5–36-V input range including 42-V abs max transient survival. Use Value: Precision enable (2.2 V threshold) enables controlled startup during battery recovery; hiccup-mode short-circuit protection enhances reliability. | Use Scenario: Local regulation for FPGA core voltage (e.g., 0.85 V) or DDR memory termination (1.2 V or 1.35 V). IC Role / Device Role / Timing Role: High-current, high-efficiency buck converter placed near load to minimize IR drop and noise coupling. Use Value: 3-A capability and low RDS(on) (120/65 mΩ) reduce thermal stress; wettable-flank-compatible HTSSOP aids automated optical inspection. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM43602PWPR | 2-A rated (vs. 3-A); identical pinout, package, and feature set except current limit | Suitable where 2-A output suffices; lower thermal stress but reduced margin for peak loads | Select LM43602PWPR if load current stays ≤2 A and board space/layout reuse is critical |
| LM46002QWRPGRQ1 | AEC-Q100 Grade 1 qualified; same 3-A rating and HTSSOP-16 package but automotive-qualified | Required for production automotive ECUs; includes extended temperature testing and PPAP support | Choose LM46002QWRPGRQ1 for safety-critical or production automotive designs requiring qualification |
Compared with LM43602PWPR and LM46002QWRPGRQ1, the LM43603PWPR offers higher current capability than the former and broader commercial temperature support than the latter - making it optimal for industrial and non-automotive high-reliability applications needing full 3-A delivery without AEC-Q100 overhead.
Availability
LM43603PWPR 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 management, and traceable sourcing.
Supply support for LM43603PWPR 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 expertise in power management ICs.
The LM4360x family was designed for high-efficiency, wide-input synchronous buck conversion in space-constrained industrial and automotive environments - emphasizing ease of use, EMI robustness, and thermal resilience.
FAQ
What is the absolute maximum input voltage rating for the LM43603PWPR?
The LM43603PWPR has an absolute maximum VIN-to-PGND rating of 42 V, as specified in Section 6.1 of the datasheet. This allows the device to survive automotive load-dump transients and industrial line surges. Operation above 36 V is not recommended for continuous use, and the recommended operating range remains 3.5 V to 36 V. Exceeding 42 V risks permanent damage to the internal high-side MOSFET.
Does the LM43603PWPR require external compensation components?
No, the LM43603PWPR features internal compensation, eliminating the need for external Type-II or Type-III compensation networks. This simplifies design and reduces bill-of-materials count. The internal loop is optimized for stability with common output capacitor types - ceramic, polymer, tantalum, or aluminum - as confirmed in the "Features" and "Electrical Characteristics" sections of the LM43603PWPR datasheet.
Can the LM43603PWPR start up into a pre-biased output?
Yes, the LM43603PWPR supports soft-start into a pre-biased output rail. This is enabled by its dedicated SS/TRK pin and internal circuitry that prevents reverse current flow during startup. When the SS/TRK pin is left floating, the device executes a 4.1-ms internal soft-start; adding an external capacitor extends this time linearly. Pre-bias startup is explicitly validated in the "Features" and "Application and Implementation" sections of the LM43603PWPR documentation.
What is the purpose of the BIAS pin on the LM43603PWPR?
The BIAS pin on the LM43603PWPR is an optional input to the internal LDO, intended to improve efficiency. When the output voltage is between 3.3 V and 28 V, TI recommends tying BIAS directly to VOUT. For other outputs or when unused, it must be tied to ground - never left floating. This configuration reduces power loss in the internal bias supply, as documented in the "Pin Functions" and "Electrical Characteristics" tables of the LM43603PWPR datasheet.
How does the LM43603PWPR meet EN55022 Class B radiated emissions requirements?
The LM43603PWPR meets EN55022 Class B radiated emissions through integrated EMI-reduction features: optimized pinout for minimal loop area, internal slew-rate control on switching nodes, and support for spread-spectrum operation via SYNC pin modulation. Radiated EMI test data (Figure 31) confirms compliance on the LM43603PWPEVM evaluation board at 12 V → 3.3 V, 3 A, 500 kHz - without additional shielding or filtering components.
LM43603PWPR 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):
- 36V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 28V
- Current - Output:
- 3A
- 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
LM43603PWPR FAQ
1.How can I place an order for LM43603PWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43603PWPR 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 LM43603PWPR reliable?
The price and inventory of LM43603PWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43603PWPR is usually 5 days.
3.What payment methods are accepted for LM43603PWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43603PWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM43603PWPR?
LM43603PWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43603PWPR 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 LM43603PWPR?
For technical support, including LM43603PWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43603PWPR requirements.
6.How does Aetrix verify that LM43603PWPR is sourced from the original manufacturer or authorized distributors?
All LM43603PWPR 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 LM43603PWPR meets industry standards.
7.What is the process for return or replacement of LM43603PWPR?
All LM43603PWPR units undergo pre-shipment inspection (PSI). If there is an issue with LM43603PWPR, 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 LM43603PWPR part is unused and in its original packaging.
Return procedure for LM43603PWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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