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Texas Instruments LM43603QPWPRQ1
- Part No.:
- LM43603QPWPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM43603QPWPRQ1.pdf
- Description:
- IC REG BUCK ADJ 3A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,278
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Product details
Overview
LM43603QPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive-qualified synchronous step-down DC-DC converter delivering up to 3 A output current across a 3.5 V to 36 V input range, featuring 27 µA quiescent current in regulation, internal compensation, and a precision 1.015 V feedback reference. It operates at a default 500 kHz switching frequency (adjustable 200 kHz–2.2 MHz), supports soft-start into pre-biased loads, and integrates power-good flag and hiccup-mode short-circuit protection for use in sub-AM band automotive power rails.
For engineers reviewing the LM43603QPWPRQ1 datasheet, LM43603QPWPRQ1 pinout, LM43603QPWPRQ1 application, or LM43603QPWPRQ1 equivalent, key selection considerations include its HTSSOP-16 package thermal performance (RθJA = 38.9°C/W), EN pin precision UVLO (2.20 V ±0.22 V), PGOOD accuracy (±13% over FB voltage), and EMI compliance with EN55022 Class B radiated emissions limits.
Technical Context
The LM43603QPWPRQ1 employs peak current mode control with cycle-by-cycle current limiting and internal slope compensation, enabling stable operation with minimal external components and compatibility with ceramic, polymer, tantalum, and aluminum output capacitors. Its integrated high-side (120 mΩ) and low-side (65 mΩ) MOSFETs support efficient 3 A continuous output with thermal shutdown at 160°C and hiccup-mode fault recovery after 5.5 ms delay.
It features dual bias paths: VCC supplies internal circuitry from VIN, while BIAS accepts external 3.3 V/5 V or VOUT (3.3–28 V) to improve light-load efficiency; SYNC enables synchronization to external clocks (2–5.5 V logic levels, 10–90% duty cycle); RT sets frequency via resistor; SS/TRK supports internal 4.1 ms soft-start or external tracking/extended ramp.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V - supports wide automotive battery transients including cold-crank (≥3.5 V start-up) and load-dump (42 V abs max). |
| Output Current | 3 A continuous - sufficient for infotainment SoC core rails, ADAS sensor modules, and body control unit sub-regulators. |
| Feedback Reference | 1.015 V ±13 mV - enables precise output regulation (e.g., 3.3 V ±1%) using standard 1% resistors in feedback divider. |
| Quiescent Current | 27 µA in regulation - extends battery life in always-on automotive modules such as telematics and gateway ECUs. |
| Switching Frequency | 200 kHz to 2.2 MHz adjustable - allows optimization of inductor size (e.g., 6.8 µH @ 500 kHz) and EMI filtering requirements. |
| Thermal Shutdown | 160°C trip / 150°C recovery - protects against sustained overload or poor PCB heatsinking in enclosed automotive enclosures. |
| EMI Compliance | Meets EN55022 Class B radiated emissions - validated on evaluation board, reducing need for additional shielding in head-unit or cluster designs. |
Pinout & Package
The LM43603QPWPRQ1 is housed in a thermally enhanced 16-pin HTSSOP (PWP) package measuring 6.6 mm × 5.1 mm × 1.2 mm, with an exposed thermal pad connected internally to AGND and requiring direct solder connection to PCB ground plane for optimal heat dissipation (RθJC(bot) = 1.7°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2) | Power switch node | Connects to inductor; carries high di/dt switching current-requires short, low-inductance layout to minimize EMI and voltage spikes. |
| CBOOT (3) | Bootstrap capacitor terminal | Supplies gate drive for high-side FET; requires 470 nF X7R ceramic capacitor placed adjacent to SW and CBOOT pins. |
| VCC (4) | Internal LDO output | Bypass with 1–10 µF capacitor to AGND; no external loading permitted-powers internal logic and gate drivers. |
| BIAS (5) | Optional LDO input | Tie to VOUT (3.3–28 V) or external rail to reduce VIN current draw and improve light-load efficiency; never exceed VIN. |
| SYNC (6) | External clock input | Accepts 2–5.5 V square wave; enables synchronized operation across multiple converters to avoid beat frequencies in multi-rail systems. |
| RT (7) | Frequency programming | Resistor to AGND sets frequency (200 kHz–2.2 MHz); open circuit defaults to 500 kHz-supports EMI spread-spectrum tuning. |
| PGOOD (8) | Open-drain power-good flag | Signals valid output (77–113% of FB voltage); requires 10–100 kΩ pull-up to ≤12 V logic rail for system sequencing. |
| FB (9) | Feedback sense input | High-impedance (≤65 nA leakage) node for resistor divider; sets output voltage as VOUT = VFB × (1 + RFBT/RFBB). |
| AGND (10) | Analog ground reference | Reference for FB, EN, SS/TRK, PGOOD; must be star-connected to PGND near device to avoid noise coupling. |
| SS/TRK (11) | Soft-start/track control | Internal 4.1 ms ramp when floating; connect capacitor for extended soft-start or external ramp for supply tracking during power-up. |
| EN (12) | Enable input | Logic-compatible (0.525 V low / 2.20 V high threshold); supports precision UVLO configuration with resistor divider from VIN. |
| VIN (13,14) | Main input supply | Dual pins reduce IR drop and inductance; connect directly to high-frequency input capacitor (CIN) with minimal loop area to PGND. |
| PGND (15,16) | Power ground return | Low-side FET source connection; tie to AGND, PAD, CIN/COUT grounds, and thermal pad-forms primary current return path. |
| PAD | Exposed thermal pad | Internally connected to AGND; must be soldered to large PCB copper area for thermal conduction and EMI reduction. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 1 (–40°C to +125°C TJ) - qualified for engine bay, front-end, and under-hood applications without derating. |
| Light-load efficiency mode | DCM and PFM operation - maintains >85% efficiency at 1 mA load, critical for always-on vehicle networks (CAN/LIN standby). |
| Integrated synchronous rectification | 120 mΩ HS / 65 mΩ LS MOSFETs - eliminates external Schottky loss, reduces solution size, and improves full-load efficiency by ~3% vs. external diode. |
| Pre-biased soft-start | Safe startup into existing VOUT - prevents reverse current flow when powering downstream regulators already biased by other sources. |
| EMI reduction architecture | Controlled SW edge rates + optimized pinout + integrated boot capacitor path - meets Class B without snubbers or metal shielding on standard 4-layer PCB. |
| Robust protection suite | Hiccup-mode short-circuit, thermal shutdown, VCC UVLO, and cycle-by-cycle current limit - ensures fault containment without latch-up or component stress. |
Applications
| Infotainment Power Supply | ADAS Camera Module Rail |
|---|---|
|
Use Scenario: Powers SoC, display driver, and audio codec in automotive head units with 12 V battery input and transient immunity requirements. IC Role / Device Role / Timing Role: Primary buck regulator providing stable 3.3 V/5 V/1.8 V rails with fast transient response (<10 µs) and low output ripple (<15 mVpp). Use Value: 27 µA quiescent current extends battery runtime during ignition-off states; EN pin UVLO enables controlled wake-up from CAN bus activity. |
Use Scenario: Supplies image sensor and ISP in forward-facing camera modules where space, thermal density, and EMI are constrained. IC Role / Device Role / Timing Role: Compact 3 A point-of-load regulator with internal compensation and 6.8 µH inductor footprint-fits within tight module PCB area. Use Value: Meets EN55022 Class B radiated emissions without added filters, avoiding interference with radar and V2X RF bands. |
| Body Control Unit Sub-Regulator | Telematics Gateway Core Supply |
|
Use Scenario: Generates 3.3 V for microcontroller, CAN transceivers, and LIN interface in door modules and seat controllers. IC Role / Device Role / Timing Role: High-efficiency synchronous buck with hiccup-mode protection-survives load dumps and reverse-battery conditions via external TVS. Use Value: 36 V max input withstands ISO 7637-2 Pulse 5a (load dump); PGOOD flag sequences MCU reset and peripheral enable timing. |
Use Scenario: Provides 1.1 V core voltage for LTE/V2X modem SoC in connected car gateways operating continuously on vehicle battery. IC Role / Device Role / Timing Role: Adjustable-frequency buck (200 kHz–2.2 MHz) enabling inductor selection trade-off between size (2.2 MHz) and efficiency (200 kHz). Use Value: BIAS pin connection to VOUT reduces VIN current by 130 µA, lowering self-heating and extending 10-year field reliability. |
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 |
|---|---|---|---|
| LM43602QPWPRQ1 | 2 A output rating, identical pinout and feature set except lower current capability and slightly higher RDS(on) (HS: 135 mΩ, LS: 70 mΩ). | Suitable for lower-power domains like instrument clusters or HVAC controls where 3 A headroom is unnecessary. | Select when system load is consistently ≤2 A and cost reduction is prioritized over margin. |
| LM46002QPWPRQ1 | 2 A rating, same HTSSOP-16 package but optimized for higher efficiency at light loads (PFM-only mode) and lower IQ (15 µA). | Better suited for ultra-low-power always-on nodes such as remote keyless entry receivers or tire pressure sensors. | Choose when quiescent current <20 µA is mandatory and peak load never exceeds 2 A. |
Compared with LM43603QPWPRQ1, the LM43602QPWPRQ1 offers identical integration and layout compatibility at reduced current capacity, while the LM46002QPWPRQ1 trades peak current for superior light-load efficiency-making the LM43603QPWPRQ1 optimal for 3 A mixed-load automotive rails requiring both transient robustness and EMI compliance.
Availability
LM43603QPWPRQ1 is available at Aetrix Electronics and suitable for automotive infotainment systems, ADAS camera modules, and body control units requiring stable component supply with AEC-Q100 qualification and long-term production continuity.
Supply support for LM43603QPWPRQ1 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 automotive-grade power management ICs with decades of automotive qualification experience.
The LM43603-Q1 product line delivers compact, high-efficiency synchronous buck converters designed specifically for demanding automotive environments-including engine compartments, ADAS subsystems, and infotainment head units-where wide input range, low quiescent current, and EMI robustness are essential.
FAQ
What is the absolute maximum input voltage rating for the LM43603QPWPRQ1?
The LM43603QPWPRQ1 has an absolute maximum input voltage of 42 V across VIN to PGND, as specified in Section 6.1 of the datasheet. This rating allows safe operation during automotive load-dump transients per ISO 7637-2 Pulse 5a, though recommended operating input is limited to 36 V. Exceeding 42 V risks permanent damage regardless of duration.
Does the LM43603QPWPRQ1 support output voltage tracking during power-up sequencing?
Yes, the LM43603QPWPRQ1 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 LM43603QPWPRQ1's output follows that ramp, enabling coordinated power-up of multiple rails in complex automotive systems without external tracking ICs.
What is the typical feedback reference voltage (VFB) and its tolerance over temperature for the LM43603QPWPRQ1?
The LM43603QPWPRQ1 has a typical feedback reference voltage of 1.015 V, with a guaranteed range of 0.999 V to 1.032 V across the full –40°C to +125°C junction temperature range. This tight tolerance enables accurate output regulation (e.g., 3.3 V ±1%) using standard 1% feedback resistors without trimming.
How does the BIAS pin improve efficiency in the LM43603QPWPRQ1?
The BIAS pin on the LM43603QPWPRQ1 allows connection to VOUT (3.3–28 V) or an external 3.3 V/5 V rail, reducing current drawn from VIN by up to 130 µA. This lowers power dissipation in the input stage and improves light-load efficiency-especially valuable in always-on automotive modules where quiescent current directly impacts battery drain.
Is the LM43603QPWPRQ1 pin-compatible with other devices in the LM4360x-Q1 family?
Yes, the LM43603QPWPRQ1 is pin-to-pin compatible with the LM43602QPWPRQ1 (2 A) and LM43601QPWPRQ1 (1 A) in the same HTSSOP-16 package. This enables scalable power design-users can select current rating based on system needs without changing PCB layout or external components beyond the inductor and output capacitor.
LM43603QPWPRQ1 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):
- 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:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM43603QPWPRQ1 FAQ
1.How can I place an order for LM43603QPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM43603QPWPRQ1 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 LM43603QPWPRQ1 reliable?
The price and inventory of LM43603QPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM43603QPWPRQ1 is usually 5 days.
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We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM43603QPWPRQ1 transactions.
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4.How is shipping managed for LM43603QPWPRQ1?
LM43603QPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM43603QPWPRQ1 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 LM43603QPWPRQ1?
For technical support, including LM43603QPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM43603QPWPRQ1 requirements.
6.How does Aetrix verify that LM43603QPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM43603QPWPRQ1 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 LM43603QPWPRQ1 meets industry standards.
7.What is the process for return or replacement of LM43603QPWPRQ1?
All LM43603QPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM43603QPWPRQ1, 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 LM43603QPWPRQ1 part is unused and in its original packaging.
Return procedure for LM43603QPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM43603QPWPRQ1 Tags
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