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Texas Instruments LM53603AQPWPRQ1
- Part No.:
- LM53603AQPWPRQ1
- Manufacturer:
- Texas Instruments
- Package:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Datasheet:
-
LM53603AQPWPRQ1.pdf
- Description:
- IC REG BUCK ADJ 3A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:10,023
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Product details
Overview
LM53603AQPWPRQ1 from Texas Instruments is an AEC-Q100 Grade 1 automotive synchronous buck converter delivering up to 3 A at 5 V or 3.3 V from 3.5 V–36 V input, featuring 2.1 MHz fixed switching frequency, ±2% output voltage tolerance, and integrated reset with 2–4 ms assertion delay - deployed in instrument clusters and ADAS power rails.
For engineers reviewing the LM53603AQPWPRQ1 datasheet, LM53603AQPWPRQ1 pinout, LM53603AQPWPRQ1 application, or LM53603AQPWPRQ1 equivalent, key selection criteria include its 3 A load capability, 1.7 µA shutdown current, FPWM mode control, thermal shutdown at 162–178°C, and HTSSOP-16 package with exposed paddle for automotive-grade thermal performance.
Technical Context
The LM53603AQPWPRQ1 implements current-mode control with automatic PWM/PFM transition and user-selectable forced PWM (FPWM) via dedicated logic input. Its oscillator supports external synchronization (SYNC pin) across 1.9–2.3 MHz while maintaining regulation down to 3.5 V input for 3.3 V output.
It integrates soft-start, internal loop compensation, valley current limiting (3.0–4.3 A), high-side peak current limit (4.5–6.2 A), and open-drain RESET with glitch filtering (12–45 µs) and 2–4 ms activation delay - all optimized for automotive transients up to 42 V for ≤500 ms.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 3 A maximum continuous - supports high-current automotive subsystems without external current boosting. |
| Input Voltage Range | 3.5 V to 36 V with 42 V transient tolerance - eliminates need for upstream surge clamping in 12 V/24 V vehicle systems. |
| Switching Frequency | 2.1 MHz fixed (±12.5%) - enables compact magnetics and avoids AM radio band; synchronizable to external clock. |
| Output Voltage Accuracy | ±2% over temperature and line/load - ensures stable MCU, sensor, and display rail compliance without post-regulation. |
| Quiescent Current | 24 µA at no load (typical) - extends battery life in always-on automotive modules during sleep mode. |
| Shutdown Current | 1.7 µA (typical) at TJ = 25°C - meets stringent automotive low-power requirements for ignition-off states. |
| Junction Temperature | –40°C to +150°C - qualified for under-hood and infotainment environments per AEC-Q100 Grade 1. |
Pinout & Package
LM53603AQPWPRQ1 uses a thermally enhanced 16-pin HTSSOP package (5.00 mm × 4.40 mm × 1.00 mm) with exposed die attach paddle (EP) for PCB-level heat sinking and noise reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SW (1,2) | Switch node | Connects directly to inductor; pins 1 and 2 must be shorted on PCB for low-inductance high-current path. |
| CBOOT (3) | Bootstrap supply | Drives high-side MOSFET gate; requires 470 nF ceramic capacitor to SW for reliable bootstrapping. |
| VCC (4) | Internal regulator output | 3.15 V supply for control circuitry; not for external loading - bypass with 3.3 µF to AGND. |
| BIAS (5) | Bias regulator input | Connected to VOUT to improve efficiency; bypass with 0.1 µF to AGND - enables low-noise operation. |
| SYNC (6) | Frequency sync input | Accepts external clock (1.9–2.3 MHz); tie to GND if unused - prevents EMI coupling from floating node. |
| FPWM (7) | Forced PWM mode control | High = constant 2.1 MHz switching; Low = auto PFM/PWM transition - critical for EMI-sensitive zones. |
| RESET (8) | Open-drain power-good flag | Asserts high after 2–4 ms delay when VOUT within ±3.5% of setpoint; requires external pull-up resistor. |
| FB (9) | Feedback input | Direct connection to 5 V/3.3 V output (no divider); for ADJ version, connects to resistor divider tap point. |
| AGND (10) | Analog ground reference | Reference for FB, EN, FPWM, SYNC; must connect to EP and PGND at single-point star ground. |
| EN (11) | Enable input | Active-high logic input (VIH ≥ 2 V); ties directly to VIN for always-on operation - hysteresis prevents chatter. |
| VIN (12,13) | Main input supply | 3.5–36 V input; pins 12 and 13 must be shorted on PCB and bypassed with low-ESR capacitors to PGND. |
| N/C (14) | No connection | Internally unconnected - leave unpopulated or float; no PCB trace required. |
| PGND (15,16) | Power ground return | Low-side MOSFET source return; connect directly to AGND and system ground plane at EP pad. |
| EP (17) | Exposed thermal pad | Must be soldered to solid copper thermal plane - primary heat path; improves RθJC(bot) to 1.1°C/W. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 1 qualification | Validated for –40°C to +125°C ambient operation with HBM ±2500 V and CDM ±750 V ESD robustness. |
| Integrated RESET with filtering | Eliminates external supervisor IC: 12–45 µs glitch filter + 2–4 ms assertion delay ensures true power-good status. |
| Valley current limiting | 3.0–4.3 A threshold protects against sustained overload and short-circuit - triggers hiccup mode after ~64 cycles. |
| BIAS-connected efficiency boost | Using BIAS pin tied to VOUT reduces quiescent current by >50% vs. VCC-only biasing - critical for low-IQ design. |
| Thermally enhanced HTSSOP | RθJA = 42.5°C/W on JEDEC 4-layer board; RθJC(bot) = 1.1°C/W enables >2 W dissipation with proper PCB copper. |
Applications
| Instrument Cluster Power Supply | ADAS Camera Module Rail |
|---|---|
|
Use Scenario: Supplies 5 V/3 A to microcontroller, CAN transceiver, and TFT display backlight drivers in digital dashboards. IC Role / Device Role / Timing Role: Primary DC-DC regulator providing stable, low-noise 5 V rail with RESET confirmation for safe boot sequencing. Use Value: 2.1 MHz switching avoids AM band interference; ±2% accuracy ensures display controller timing margin compliance. |
Use Scenario: Powers image signal processor (ISP), CMOS sensor, and serializer in forward-facing ADAS cameras. IC Role / Device Role / Timing Role: High-reliability buck converter with 42 V transient tolerance and RESET flag for fault-safe camera startup. Use Value: Valley current limit and hiccup protection prevent thermal runaway during lens motor stall or cable short events. |
| Automotive Infotainment Core Rail | HUD Projection System Supply |
|
Use Scenario: Delivers 3.3 V/3 A to application processor, audio codec, and Wi-Fi/BT SoC in head-unit systems. IC Role / Device Role / Timing Role: Synchronous step-down regulator with FPWM mode enabling deterministic EMI profile during RF transmission. Use Value: 24 µA no-load IQ extends battery runtime in accessory mode; BIAS pin connection improves light-load efficiency by 8–10%. |
Use Scenario: Generates 5 V for DLP or LCoS microdisplay driver and LED illumination control in augmented reality HUDs. IC Role / Device Role / Timing Role: Automotive-grade buck converter with soft-start and precise RESET for synchronized projector initialization. Use Value: 2 ms soft-start prevents inrush-induced voltage droop on shared 12 V bus; thermal shutdown at 162°C guards against optical module overheating. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck converter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM53602AQPWPRQ1 | 2 A max output current; lower valley current limit (2.0–2.8 A); identical pinout and feature set. | Suitable for lower-power instrument clusters or body control modules where 3 A headroom is unnecessary. | Select when load current stays below 2 A - same layout, reduced cost, identical thermal footprint. |
| TPS54360BQDDARQ1 | 3.5–60 V input range; 3.5 A output; adjustable frequency (100 kHz–2.5 MHz); no integrated RESET output. | Used in 24 V commercial truck systems requiring wider VIN; lacks built-in power-good flag for simplified sequencing. | Choose for higher-input-voltage platforms or when external supervision is acceptable - requires additional RESET circuitry. |
Compared with LM53602AQPWPRQ1 and TPS54360BQDDARQ1, the LM53603AQPWPRQ1 uniquely combines 3 A capability, automotive RESET integration, and 3.5 V minimum start-up in a single HTSSOP package - eliminating discrete supervision and reducing BOM count in safety-critical domains.
Availability
LM53603AQPWPRQ1 is available at Aetrix Electronics and suitable for automotive instrument clusters, ADAS camera modules, and HUD projection systems requiring stable component supply with full AEC-Q100 traceability and long-term production support.
Supply support for LM53603AQPWPRQ1 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 expertise.
The LM53603-Q1 belongs to TI's automotive-qualified buck converter family designed specifically for 12 V/24 V vehicle subsystems - emphasizing transient robustness, integrated diagnostics, and thermal reliability in constrained spaces.
FAQ
What is the minimum input voltage required for LM53603AQPWPRQ1 to regulate a 3.3 V output?
The LM53603AQPWPRQ1 regulates a 3.3 V output down to a minimum input voltage of 3.9 V at 3 A load, and 3.55 V at 1 A load, as specified in the System Characteristics table. This ultra-low dropout capability enables operation during cold-crank conditions in 12 V automotive systems where battery voltage dips below 6 V.
Does LM53603AQPWPRQ1 require external feedback resistors for fixed 5 V or 3.3 V output configurations?
No, the LM53603AQPWPRQ1 does not require external feedback resistors for fixed 5 V or 3.3 V outputs - the FB pin is internally connected to the appropriate voltage divider. External resistors are only needed for the ADJ version, where FB connects to the divider tap point to set output between 3.3 V and 6 V.
How does the RESET function of LM53603AQPWPRQ1 differ from a standard power-good signal?
The LM53603AQPWPRQ1 RESET includes a 12–45 µs glitch filter and 2–4 ms assertion delay, with thresholds tracking the output voltage (e.g., 94.5–96.5% falling threshold relative to actual VOUT). This eliminates false triggers during transients and provides tighter tolerance than external supervisors - a key differentiator confirmed in Section 8.3.1 of the datasheet.
Can LM53603AQPWPRQ1 operate safely during 42 V load-dump transients?
Yes, the LM53603AQPWPRQ1 withstands 42 V transients on VIN for up to 500 ms at ≤0.01% duty cycle, as defined in Absolute Maximum Ratings. This meets ISO 7637-2 Pulse 5a requirements for 12 V automotive systems, allowing direct connection to battery without additional TVS clamping in most implementations.
What is the purpose of the BIAS pin on LM53603AQPWPRQ1, and how should it be connected?
The BIAS pin supplies the internal LDO that powers control circuitry. It must be connected to the output voltage (VOUT) - not ground - and bypassed with a 0.1 µF ceramic capacitor to AGND. This configuration reduces no-load IQ to 24 µA and improves light-load efficiency by leveraging regulated output voltage instead of internal VCC.
LM53603AQPWPRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width) Exposed Pad
- 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):
- 3.9V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- 6V
- Current - Output:
- 3A
- Frequency - Switching:
- 2.1MHz
- Synchronous Rectifier:
- Yes
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-HTSSOP
LM53603AQPWPRQ1 FAQ
1.How can I place an order for LM53603AQPWPRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM53603AQPWPRQ1 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 LM53603AQPWPRQ1 reliable?
The price and inventory of LM53603AQPWPRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM53603AQPWPRQ1 is usually 5 days.
3.What payment methods are accepted for LM53603AQPWPRQ1?
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LM53603AQPWPRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM53603AQPWPRQ1 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 LM53603AQPWPRQ1?
For technical support, including LM53603AQPWPRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM53603AQPWPRQ1 requirements.
6.How does Aetrix verify that LM53603AQPWPRQ1 is sourced from the original manufacturer or authorized distributors?
All LM53603AQPWPRQ1 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 LM53603AQPWPRQ1 meets industry standards.
7.What is the process for return or replacement of LM53603AQPWPRQ1?
All LM53603AQPWPRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with LM53603AQPWPRQ1, 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 LM53603AQPWPRQ1 part is unused and in its original packaging.
Return procedure for LM53603AQPWPRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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