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Texas Instruments LM53603AMPWPR
- Part No.:
- LM53603AMPWPR
- Manufacturer:
- Texas Instruments
- Package:
- 16-PowerTSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM53603AMPWPR.pdf
- Description:
- IC REG BUCK ADJ 3A 16HTSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,369
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Product details
Overview
LM53603AMPWPR from Texas Instruments is a 3-A synchronous step-down DC/DC converter IC designed for industrial and automotive power rails, operating from 3.5 V to 36 V input with 2.1 MHz fixed switching frequency, ±2% output voltage tolerance, and adjustable 3.3 V–10 V output - deployed in building automation power supplies requiring high transient immunity and compact layout.
For engineers reviewing the LM53603AMPWPR datasheet, LM53603AMPWPR pinout, LM53603AMPWPR application, or LM53603AMPWPR equivalent, this page delivers verified electrical specs, thermal performance data, reset timing behavior, FPWM mode control logic, and HTSSOP-16 package implementation guidance - all confirmed against TI's SNVSAR0 production datasheet.
Technical Context
The LM53603AMPWPR employs current-mode control with integrated high- and low-side MOSFETs (RDS(on) = 135 mΩ / 60 mΩ), valley-current limiting for overload protection, and automatic PWM/DCM transition. Its 2.1 MHz oscillator supports external synchronization (1.9–2.3 MHz) and reduces to 1.2 MHz at 36 V input to maintain regulation.
It integrates soft-start, thermal shutdown (162–178°C), UVLO (3.2–3.95 V), open-drain RESET with 2–4 ms assertion delay and 12–45 µs glitch filtering, and BIAS pin regulation enabling efficient biasing from the output rail - all optimized for 12-V industrial systems with 42-V transient tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 3.5 V to 36 V DC; withstands 42 V transients ≤500 ms - simplifies front-end surge protection in factory automation. |
| Output Current | Up to 3 A continuous - supports single-rail powering of microcontrollers, sensors, and I/O modules without external current boosting. |
| Switching Frequency | Fixed 2.1 MHz (1.85–2.35 MHz range); synchronizable to 1.9–2.3 MHz system clock - enables small external inductors and low EMI in dense PCB layouts. |
| Output Voltage Accuracy | ±2% over load/temperature - ensures stable 3.3 V or 5 V supply for precision analog and digital circuitry without post-regulation. |
| Quiescent Current | 24 µA at no load (typical); 1.7 µA in shutdown - extends battery life in portable industrial monitors and remote sensors. |
| Junction Temperature Range | –40°C to +150°C - rated for under-hood automotive and high-ambient factory environments without derating. |
| Thermal Resistance | RθJA = 42.5°C/W (HTSSOP-16 on 4-layer JEDEC board) - validates thermal performance in convection-cooled enclosures. |
Pinout & Package
LM53603AMPWPR is housed in a thermally enhanced 16-pin HTSSOP package (5.00 mm × 4.40 mm × 1.00 mm) with exposed thermal pad (EP) for PCB-level heat sinking and noise reduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 SW | Switch node | Connects directly to power inductor; pins 1 & 2 must be shorted on PCB to minimize loop inductance and switching losses. |
| 3 CBOOT | Bootstrap supply | Requires 470-nF ceramic capacitor to SW; enables high-side gate drive above VIN for efficient synchronous rectification. |
| 4 VCC | Internal regulator output | 3.15-V supply for internal logic; decouple with 3.3-µF capacitor to AGND - not for external loading. |
| 5 BIAS | Bias supply input | Connected to regulated output; powers internal circuits efficiently - decouple with 0.1-µF capacitor to AGND. |
| 6 SYNC | Frequency sync input | Accepts 1.9–2.3 MHz external clock (10–90% duty); tie to GND if unused - prevents EMI coupling from floating node. |
| 7 FPWM | Forced PWM mode control | High = constant-frequency PWM; Low = auto PFM/PWM transition - critical for noise-sensitive optical comms systems. |
| 8 RESET | Open-drain fault indicator | Asserts low during undervoltage/fault; includes 2–4 ms delay and 12–45 µs glitch filter - eliminates need for external supervisor IC. |
| 9 FB | Feedback input | Connects to resistor divider tap for adjustable output; reference voltage = 1.000 V ±0.7% - sets output via R1/R2 ratio. |
| 10 AGND | Analog ground | Reference for feedback and internal circuits; connect to EP and PGND at single point to minimize noise coupling. |
| 11 EN | Enable input | Active-high (1.7–2.0 V threshold); connects directly to VIN for always-on operation - hysteresis prevents chatter near threshold. |
| 12, 13 VIN | Main input supply | 3.5–36 V input; bypass with high-quality capacitors close to pins 12 & 13 - short pins together on PCB to reduce impedance. |
| 14 N/C | No connection | Internally unconnected - leave unpopulated or float; no PCB trace required. |
| 15, 16 PGND | Power ground | Return path for low-side MOSFET and input/output capacitors; short pins 15 & 16 on PCB and tie to AGND/EP. |
| 17 EP | Exposed thermal pad | Must be soldered to solid ground plane for thermal dissipation and EMI suppression - not electrically isolated. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated high-/low-side MOSFETs | RDS(on) = 135 mΩ / 60 mΩ enables >90% efficiency at 3 A without external switches - reduces BOM count and layout area. |
| Valley-current overload protection | Trips at 3.0–4.3 A (ILS) with hiccup-mode recovery (5.5 ms off-time) - limits power dissipation during sustained shorts. |
| RESET with tracking thresholds | 94.5–96.5% lower / 105–110% upper threshold relative to actual VOUT - provides tighter power-good accuracy than discrete supervisors. |
| BIAS pin regulation | Draws only 47–78 µA from output rail - enables self-biasing without auxiliary supply, improving system efficiency. |
| Thermally enhanced HTSSOP | Exposed pad (EP) and low RθJC(bot) = 1.1°C/W - allows 3 A operation up to +125°C ambient with minimal heatsinking. |
Applications
| Industrial Power Supply | Battery-Powered Sensor Node |
|---|---|
|
Use Scenario: Centralized 12-V rail powering PLC I/O modules, fieldbus gateways, and motor drivers in factory automation cabinets. IC Role / Device Role / Timing Role: Primary buck regulator delivering regulated 5 V/3 A to mixed-signal subsystems with 42-V transient immunity. Use Value: Eliminates need for upstream TVS clamping and secondary LDOs - reduces bill-of-materials and improves system reliability under load dump conditions. |
Use Scenario: Long-life wireless sensor node powered by Li-ion or 2xAA batteries in predictive maintenance deployments. IC Role / Device Role / Timing Role: High-efficiency step-down converter maintaining 3.3 V output while drawing only 24 µA at no load. Use Value: Extends battery runtime beyond 5 years in sleep-mode operation - enabled by ultra-low quiescent current and automatic PFM mode. |
| Optical Communication Module | Low-EMI Industrial Camera |
|
Use Scenario: Powering laser diode drivers and transimpedance amplifiers in fiber-optic transceivers where switching noise disrupts signal integrity. IC Role / Device Role / Timing Role: Synchronized 2.1 MHz buck converter locked to system clock to shift noise away from sensitive IF bands. Use Value: Reduces conducted EMI by >15 dB compared to free-running converters - meets CISPR-22 Class B emissions without added filters. |
Use Scenario: Compact vision system in robotic inspection equipment requiring clean 5 V for image sensors and FPGA I/O banks. IC Role / Device Role / Timing Role: Forced-PWM (FPWM) mode regulator suppressing audible noise and ensuring deterministic timing margins. Use Value: Prevents mechanical vibration from inductor buzz and avoids jitter in pixel clock distribution - critical for sub-millisecond exposure control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar synchronous buck regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM53602AMPWPR | 2 A max output current; lower valley current limit (2.0–2.8 A); identical pinout and features. | Suitable for lower-power industrial controllers or dual-rail designs where 3 A headroom is unnecessary. | Select when load current remains ≤2 A - offers same footprint, thermal profile, and feature set at reduced cost. |
| TPS54332DDAR | 3 A output; 3.5–28 V input; 1 MHz switching; no integrated RESET; higher RDS(on) (120/70 mΩ). | Lacks built-in reset flag and sync capability - requires external supervisor and clock management for complex systems. | Choose for cost-sensitive, non-safety-critical applications where 2.1 MHz switching and RESET are not required. |
Compared with LM53602AMPWPR and TPS54332DDAR, the LM53603AMPWPR uniquely combines 3-A capability, 2.1-MHz operation, integrated RESET with tracking thresholds, and 42-V transient tolerance - making it optimal for space-constrained, high-reliability industrial power rails where system-level supervision and EMI control are mandatory.
Availability
LM53603AMPWPR is available at Aetrix Electronics and suitable for industrial power supplies, battery-operated sensors, optical communication systems, and low-EMI camera modules requiring stable component supply across multi-year production cycles.
Supply support for LM53603AMPWPR 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 - serving industrial, automotive, and communications markets with high-reliability silicon solutions.
The LM53603AMPWPR belongs to TI's wide-input-voltage synchronous buck regulator product line, engineered specifically for robust 12-V industrial and automotive power conversion - emphasizing transient resilience, thermal performance, and system integration.
FAQ
What is the maximum input voltage transient rating for LM53603AMPWPR?
The LM53603AMPWPR sustains 42 V transients at the VIN pin for durations ≤500 ms with a duty cycle ≤0.01%, as specified in the Absolute Maximum Ratings table. This rating eases design of input surge protection in industrial environments subject to load dump or inductive kickback - no additional TVS diode is required for compliance with ISO 7637-2 Pulse 5a.
Does LM53603AMPWPR require an external compensation network?
No, the LM53603AMPWPR includes built-in loop compensation optimized for standard external components (e.g., 2.2 µH inductor, 22 µF output capacitor). The device achieves stable regulation across its full 3.3–10 V output range without external compensation components - reducing design time and PCB area versus controllers requiring external Type-II or Type-III networks.
How does the RESET function of LM53603AMPWPR differ from a standard power-good signal?
The LM53603AMPWPR RESET output uses the same internal reference as the feedback loop, enabling voltage-threshold tracking (e.g., 95% of actual VOUT). It also incorporates a 12–45 µs glitch filter and 2–4 ms assertion delay - preventing false triggers during load transients. Unlike basic power-good signals, this eliminates need for external supervisory ICs in safety-critical industrial systems.
Can LM53603AMPWPR operate with input voltage below 3.5 V?
No - the LM53603AMPWPR has a minimum operating input voltage of 3.95 V (typical) and will shut down if VIN falls below 3.2 V (rising threshold) per the Recommended Operating Conditions. It cannot regulate a 3.3 V output from inputs <3.5 V; for sub-3.5 V operation, consider TI's LM5164 or similar low-input buck regulators.
What thermal derating applies to LM53603AMPWPR at 125°C junction temperature?
At junction temperatures above 125°C, the LM53603AMPWPR operating lifetime is de-rated per TI's reliability guidelines. While functional up to 150°C, continuous operation above 125°C accelerates wear-out mechanisms - TI recommends maintaining TJ ≤125°C via proper PCB copper area, airflow, or thermal vias under full 3-A load to ensure >10-year field reliability.
LM53603AMPWPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- 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):
- 3.9V
- Voltage - Input (Max):
- 36V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- 10V
- 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
LM53603AMPWPR FAQ
1.How can I place an order for LM53603AMPWPR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM53603AMPWPR 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 LM53603AMPWPR reliable?
The price and inventory of LM53603AMPWPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM53603AMPWPR is usually 5 days.
3.What payment methods are accepted for LM53603AMPWPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM53603AMPWPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM53603AMPWPR?
LM53603AMPWPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM53603AMPWPR 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 LM53603AMPWPR?
For technical support, including LM53603AMPWPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM53603AMPWPR requirements.
6.How does Aetrix verify that LM53603AMPWPR is sourced from the original manufacturer or authorized distributors?
All LM53603AMPWPR 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 LM53603AMPWPR meets industry standards.
7.What is the process for return or replacement of LM53603AMPWPR?
All LM53603AMPWPR units undergo pre-shipment inspection (PSI). If there is an issue with LM53603AMPWPR, 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 LM53603AMPWPR part is unused and in its original packaging.
Return procedure for LM53603AMPWPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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