TPS5450QDDARQ1 - 5A 36V Automotive Buck Converter | TI
MPN: TPS5450QDDARQ1 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.85 | $3.85 |
| 10 | $3.47 | $34.70 |
| 100 | $3.05 | $305.00 |
| 500 | $2.72 | $1,360.00 |
| 1,000 | $2.45 | $2,450.00 |
Drop-in alternatives for TPS5450QDDARQ1 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
TPS5450DDAR
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View Datasheet →TPS5450DDAG4
✅ Drop-In📋 Reference alternative (not in catalog)
TPS5430QDDARQ1
⚡ Same Package✓ In Stock
$1.95 / Unit
View Datasheet →TPS54360DDAR
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View Datasheet →TPS5450QDDARQ1 Maximum Ratings & Electrical Characteristics
| Topology | Step-Down (Buck), Non-Synchronous |
| Input Voltage Range | 5.5 V to 36 V |
| Output Voltage Range | 1.221 V to 31 V (Adjustable) |
| Maximum Output Current | 5 A continuous, 6 A peak |
| Switching Frequency | 500 kHz (fixed) |
| Control Topology | Voltage-Mode PWM, internally compensated |
| Number of Outputs | 1 |
| Shutdown Supply Current | 18 uA (typ, via ENA pin) |
| Enable Pin | Yes (ENA, active-high) |
| Protection Features | Overcurrent limiting, overvoltage protection, thermal shutdown |
| Qualification | AEC-Q100 qualified for automotive applications |
| Operating Temperature | -40 C to +125 C |
| Package | HSOIC (DDA) 8-PowerSOIC with PowerPAD, 8 pins |
| Package Dimensions | 4.9 mm x 3.9 mm, height 1.55 mm (max) |
| Mounting Type | Surface Mount (gull-wing leads) |
| Packaging | Tape and Reel |
| Synchronous Rectifier | No (external Schottky catch diode required) |
| RoHS Status | [DATA_NEEDED: RoHS status] |
TPS5450QDDARQ1 Pin Configuration
| Pin 1 | BOOT — Bootstrap capacitor connection for high-side MOSFET gate drive |
| Pin 2 | VIN — Input supply, 5.5 V to 36 V |
| Pin 3 | ENA — Enable input, active high; ties device shutdown current to 18 uA when low |
| Pin 4 | VSENSE — Feedback voltage sense input (1.221 V reference) |
| Pin 5 | GND — Ground reference |
| Pin 6 | PH — Half-bridge switch node - connect catch diode and output inductor |
| Pin 7 | GND — Ground |
| Pin PowerPAD | GND (EP) — Exposed thermal pad - must be soldered to ground copper pour |
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
TPS5450QDDARQ1 is suitable for 6 applications: Automotive Infotainment 5V Rail, Industrial 24V Bus Step-Down, ADAS and Body Electronics Point-of-Load, Server and Telecom Intermediate Bus, LED Lighting and Display Bias, Battery-Charger System Power.
Automotive Infotainment 5V Rail
The TPS5450QDDARQ1's AEC-Q100 qualification and 5.5V to 36V input range make it ideal for infotainment and cluster 12V-bus to 5V conversion. Its 5A continuous output comfortably powers displays, audio amplifiers, and SoC cores, while the 36V rating absorbs automotive transient conditions ahead of upstream clamp protection. Used with a 500 kHz inductor of roughly 15 uH and a 5A Schottky catch diode, the internally compensated voltage-mode loop simplifies design; the PowerPAD package dissipates conversion losses into the PCB ground plane, and the 18 uA shutdown current supports key-off standby budgets.
Recommended
Industrial 24V Bus Step-Down
In industrial automation, the 36V input limit gives ample headroom over 24V bus rails, and the 5A output serves PLC I/O, motor-drive auxiliary supplies, and sensor hubs. The wide input range tolerates sag and surge without preregulation, while cycle-by-cycle overcurrent limiting and thermal shutdown protect against fault conditions on long field wiring. Because the converter is non-synchronous, a single external Schottky diode completes the power stage, keeping the bill of materials minimal. Internal compensation means no loop tuning is required across varying output capacitance loads common in modular industrial systems.
Recommended
ADAS and Body Electronics Point-of-Load
ADAS modules, body-control units, and gateway ECUs need robust 5A point-of-load rails from the 12V battery rail. The TPS5450QDDARQ1's fixed 500 kHz switching frequency keeps inductors compact for dense ECU boards, and its active-high ENA pin enables controlled power sequencing with microcontroller supervision - shutdown current drops to 18 uA when disabled. The adjustable 1.221V reference supports precise rail settings via a resistor divider, and overvoltage protection guards downstream processors against feedback divider faults, an important safety consideration in ADAS power trees.
Recommended
Server and Telecom Intermediate Bus
Telecom equipment running on 24V or negative-48V-derived rails benefits from the wide 5.5V to 36V input window. The TPS5450QDDARQ1 delivers 5A for powering fans, drive interface boards, and distributed 3.3V/5V loads. Its voltage-mode PWM architecture at 500 kHz balances efficiency and magnetic size, while the PowerPAD HSOIC handles multi-watt losses on a well-ventilated PCB. Overcurrent and thermal protection support high-availability systems that must recover gracefully from faults, and the 18 uA shutdown current allows energy-saving sleep states between active cycles.
Recommended
LED Lighting and Display Bias
High-brightness LED drivers, signage controllers, and display backplanes frequently need a stiff 5V rail from vehicle or industrial inputs. The TPS5450QDDARQ1's 6A peak capability handles LED string inrush and pulsed display loads, while the adjustable output down to 1.221V covers low-voltage logic rails of display controllers. With internal compensation, the design tolerates the wide output capacitance ranges typical of LED driver boards. Place the converter near the load to minimize IR drop; the 500 kHz switching frequency allows filtering of output ripple to levels acceptable for visual-flicker-free illumination.
Recommended
Battery-Charger System Power
On-board chargers and battery-management front ends require a wide-input auxiliary supply for control circuitry, gate drivers, and communication. The TPS5450QDDARQ1 provides 5A from 12V or 24V battery inputs with full automotive qualification for traction and storage systems. Overvoltage protection safeguards sensitive BMS analog front ends, and the ENA pin lets the system controller disable the rail for low quiescent standby. The non-synchronous topology avoids gate-drive complexity at these voltages; select a 100V-class Schottky for margin on automotive 12V systems with transient events.
Recommended
Recommended Products Summary
Engineering reference data for TPS5450QDDARQ1 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | TPS5450DDAR | TPS5430QDDARQ1 | TPS54360DDAR | TPS54331DR |
|---|---|---|---|---|---|
| Package | HSOIC (DDA) PowerPAD-8 | HSOIC (DDA) PowerPAD-8 - same | HSOIC (DDA) PowerPAD-8 - same | HSOIC (DDA) PowerPAD-8 - same | SOIC-8 (no PowerPAD) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Input Voltage Range | 5.5 V to 36 V | 5.5 V to 36 V | 5.5 V to 36 V | 3.8 V to 60 V | 3.5 V to 28 V |
| Output Current | 5 A (6 A peak) | 5 A (6 A peak) | 3 A | 3.5 A | 3 A |
| Output Voltage Range | 1.221 V to 31 V | 1.221 V to 31 V | 1.221 V to 30 V | 0.8 V adjustable | 0.8 V adjustable |
| Automotive Grade (AEC-Q100) | Yes | No | Yes | No | No |
| Switching Frequency | 500 kHz fixed | 500 kHz fixed | 500 kHz fixed | Adaptive on-time | 570 kHz fixed |
| Shutdown Current | 18 uA (typ) | 18 uA (typ) | 18 uA (typ) | 2 uA (typ) | 2 uA (typ) |
| Thermal Enhancement | PowerPAD (DDA) | PowerPAD (DDA) | PowerPAD (DDA) | PowerPAD (DDA) | None (standard SOIC-8) |
| Price (qty 1, as of 2026-08-29) | approx. $3.85 | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] | [DATA_NEEDED] |
Key Differentiators
- AEC-Q100 automotive qualification (vs TPS5450DDAR)
- Highest current in DDA PowerPAD wide-input family (vs TPS5430QDDARQ1)
- Wider input headroom option for severe transients (vs TPS54360DDAR)
Design Notes
The DDA PowerPAD must be soldered to a ground copper pour with at least 6-9 thermal vias to the internal ground plane. At 12V-in/5V-out/5A, conduction plus switching losses can reach 2-3W; without proper PowerPAD connection, junction temperature quickly approaches the 125C limit. Refer to TI's PowerPAD Thermally Enhanced Package application guidance for land-pattern and via-stitching details.
Place the Schottky catch diode as close as possible to the PH and GND pins to minimize the high-frequency switching loop area, reducing EMI and ringing. Keep the bootstrap capacitor (BOOT to PH) within 5 mm of the pins, and route the VSENSE feedback trace away from the PH node to avoid switching-noise coupling into the feedback loop.
Do not exceed 36V input - the 36V rating is an absolute design ceiling, not a transient margin; add TVS protection for automotive load dump. Verify the feedback divider with 1% resistors since VOUT accuracy depends directly on it. When substituting the non-automotive TPS5450DDAR, note it lacks AEC-Q100 qualification and must not be used in automotive safety applications.
Size the inductor for peak current of at least 6A with adequate saturation margin (choose ~7-8A Isat). The catch diode must carry the full 5A average output; a low-Vf Schottky (e.g., 45V/5A+) minimizes loss since it conducts during the entire off-time of this non-synchronous converter. Efficiency drops at light load from diode conduction - consider a synchronous alternative for high light-load efficiency needs.
Compliance Information
AEC-Q100 automotive qualification confirmed by TI product page ('Qualified for Automotive Applications'). RoHS/REACH/lead-free status not present in retrieved web data - [DATA_NEEDED: RoHS/REACH compliance].
