TPS5450DDAR - 5A, 36V Step-Down Converter | Texas Instruments
MPN: TPS5450DDAR β Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.42 | $3.42 |
| 10 | $3.08 | $30.80 |
| 100 | $2.74 | $274.00 |
| 500 | $2.47 | $1,235.00 |
| 1,000 | $2.2 | $2,200.00 |
Drop-in alternatives for TPS5450DDAR β same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool β Select alternative parts for side-by-side comparison:
TPS5450DDA
β Drop-Inπ Reference alternative (not in catalog)
TPS5450MDDAREP
β Drop-Inπ Reference alternative (not in catalog)
TPS5450DDARG4
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TPS5430DDAR
β Drop-Inβ In Stock
$1.85 / Unit
View Datasheet βTPS5420DDAR
β Drop-Inπ Reference alternative (not in catalog)
TPS5450DDAR Maximum Ratings & Electrical Characteristics
| Function | Step-Down (Buck) Converter |
| Output Type | Adjustable |
| Output Voltage Range | 1.22 V to 31 V |
| Maximum Output Current | 5 A |
| Input Voltage Range | 5.5 V to 36 V |
| Switching Frequency | 500 kHz |
| Quiescent Current (typ) | 3 mA |
| Topology | Buck |
| Package | HSOIC-8 (DDA) PowerPAD |
| Mounting Type | Surface Mount |
| Number of Pins | 8 |
| Operating Temperature Range | -40Β°C to +125Β°C |
| Features | Enable, Over Current Protection, Thermal Shutdown |
| RoHS Status | Compliant |
| Synchronous Rectifier | No (External Diode) |
TPS5450DDAR Pin Configuration
| Pin 1 | BOOT β Bootstrap capacitor connection for high-side driver |
| Pin 2 | VIN β Input supply voltage |
| Pin 3 | EN β Enable input (active high) |
| Pin 4 | RT/CLK β Timing resistor / external clock input |
| Pin 5 | GND β Ground |
| Pin 6 | GND β Ground (PowerPAD) |
| Pin 7 | PH β Switch node (output to inductor) |
| Pin 8 | VSENSE β Voltage sense feedback |
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this component. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
TPS5450DDAR is suitable for 6 applications: FPGA Power Supply, Industrial Automation, Telecom Equipment, Automotive Power Systems, Point-of-Load (POL) Converters, Battery-Powered Devices.
FPGA Power Supply
The TPS5450DDAR provides a high-current, adjustable output voltage (1.22V to 31V) suitable for powering FPGA core and I/O rails. Its 5A output current can handle the dynamic load requirements of modern FPGAs, while the 500kHz switching frequency allows for small external components, saving board space. The enable pin enables power sequencing, which is critical for FPGA startup. The wide input range (5.5V to 36V) accommodates various system power buses, making it a flexible solution for FPGA-based designs.
Recommended
Industrial Automation
In industrial automation, the TPS5450DDAR converts 24V industrial bus voltages down to logic levels (e.g., 5V or 3.3V) for microcontrollers, sensors, and communication interfaces. Its wide input range (5.5V to 36V) handles voltage transients common in industrial environments. The 5A output current supports multiple loads, and the thermal-enhanced HSOIC package ensures reliable operation in high-temperature settings. The overcurrent protection and thermal shutdown features enhance system safety.
Recommended
Telecom Equipment
The TPS5450DDAR is ideal for telecom equipment that requires efficient conversion from a 48V backplane (or 12V intermediate bus) to lower voltages for line cards, processors, and ASICs. Its high efficiency reduces heat dissipation, which is crucial in densely packed telecom racks. The adjustable output voltage allows for precise regulation of various supply rails. The 500kHz switching frequency minimizes the size of external magnetics, enabling compact power modules.
Recommended
Automotive Power Systems
In automotive applications, the TPS5450DDAR can step down 12V or 24V battery voltages to power infotainment systems, ADAS processors, and sensors. Its wide input range (5.5V to 36V) accommodates load dump and cold-crank conditions. The device's operating temperature range (-40Β°C to +125Β°C) meets automotive requirements. The enable pin allows for controlled power-up sequences, and the overcurrent protection safeguards against faults.
Recommended
Point-of-Load (POL) Converters
The TPS5450DDAR is well-suited for point-of-load converters that generate local supply rails from a distributed bus. Its 5A output current can power high-performance processors, FPGAs, and ASICs. The adjustable output voltage (1.22V to 31V) provides flexibility for different load requirements. The high switching frequency (500kHz) allows for small inductor and capacitor values, reducing PCB area and cost. The device's high efficiency minimizes thermal stress on surrounding components.
Recommended
Battery-Powered Devices
For battery-powered devices, the TPS5450DDAR efficiently steps down battery voltages (e.g., 12V or 24V) to lower system voltages. Its low quiescent current (3mA) helps extend battery life during light-load conditions. The wide input range supports various battery chemistries and cell counts. The enable pin can be used to shut down the converter in standby mode, further reducing power consumption. The small HSOIC package is suitable for portable equipment.
Recommended
Recommended Products Summary
Engineering reference data for TPS5450DDAR β comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS5450DDA | TPS5450MDDAREP | TPS5450DDARG4 | TPS5430DDAR | TPS5420DDAR |
|---|---|---|---|---|---|---|
| Package | HSOIC-8 (DDA) | HSOIC-8 (DDA) | HSOIC-8 (DDA) | HSOIC-8 (DDA) | HSOIC-8 (DDA) | HSOIC-8 (DDA) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Output Current | 5 A | 5 A | 5 A | 5 A | 3 A | 2 A |
| Input Voltage Range | 5.5V to 36V | 5.5V to 36V | 5.5V to 36V | 5.5V to 36V | 5.5V to 36V | 5.5V to 36V |
| Output Voltage Range | 1.22V to 31V | 1.22V to 31V | 1.22V to 31V | 1.22V to 31V | 1.22V to 31V | 1.22V to 31V |
| Switching Frequency | 500 kHz | 500 kHz | 500 kHz | 500 kHz | 500 kHz | 500 kHz |
| Quiescent Current | 3 mA | 3 mA | 3 mA | 3 mA | 3 mA | 3 mA |
| Enable Pin | Yes | Yes | Yes | Yes | Yes | Yes |
Key Differentiators
- Higher output current (5A) compared to TPS5430DDAR (3A) and TPS5420DDAR (2A) (vs TPS5430DDAR, TPS5420DDAR)
- Wide input voltage range (5.5V to 36V) with 5A output (vs LM2576T-ADJ (40V input but only 3A output))
- Fixed 500kHz switching frequency (vs LM2576T-ADJ (52kHz))
Design Notes
For optimal thermal performance, connect the PowerPAD to a large copper area on the PCB. Use multiple vias to transfer heat to the ground plane. Ensure adequate copper thickness and area to keep the junction temperature below 125Β°C at maximum load. Refer to TI's PowerPAD application note for layout guidelines.
Select an inductor with a saturation current rating higher than the peak switch current. For 5A output, a 10Β΅H to 22Β΅H inductor with low DCR is recommended. Use low-ESR ceramic capacitors for input and output filtering. A 10Β΅F input capacitor and 100Β΅F output capacitor are typical values, but adjust based on transient requirements.
Ensure the bootstrap capacitor (BOOT pin) is placed close to the IC and has a value of 0.1Β΅F. Do not omit the enable pin pull-up resistor if the enable function is not used. Also, verify the feedback resistor divider accuracy to maintain output voltage regulation. Avoid long traces to the VSENSE pin to prevent noise pickup.
Compliance Information
RoHS compliant per TI product page. Not AEC-Q100 qualified; for automotive, consider TPS5450-Q1 variants if available.
