TPS5430DDAR DC-DC Buck Switching Voltage Regulators SOP-8

TPS5430DDAR DC-DC Buck Switching Voltage Regulator SOP-8 is a high-performance, synchronous step-down converter that offers a reliable solution for efficient power management. It integrates a low-resistance, high-side MOSFET and a low-resistance, low-side synchronous rectifier into a single compact package, enabling it to deliver up to 3 A of continuous output current. Engineers utilize the TPS5430DDAR when they need to step down a higher input voltage to a precise, lower output voltage with minimal power loss, typically achieving efficiencies well above 90%. Its ability to operate across a wide input voltage range and its internal compensation features simplify the design process, making it an excellent choice for industrial, computing, and consumer electronics requiring robust power delivery in a small SOP-8 footprint.

Key Features:

• High Current Capability: Delivers up to 3 A of continuous output current, supporting demanding loads in compact systems.
• Wide Input Voltage Range: Operates efficiently from a 4.5 V to 28 V input, making it suitable for 5 V, 12 V, and 24 V systems.
• High Efficiency Synchronous Design: Integrates both high-side and low-side MOSFETs, eliminating the need for an external Schottky diode and boosting efficiency.
• Adjustable Output Voltage: You can set the output voltage from 0.8 V up to the input voltage using an external resistor divider.
• Fixed 570 kHz Switching Frequency: The internal clock operates at a fixed frequency, simplifying filter design and minimizing electromagnetic interference (EMI).
• Integrated Protection: Features include cycle-by-cycle current limiting, thermal shutdown, and undervoltage lockout (UVLO).

Technical Specifications:

• Topology: Step-Down (Buck) Synchronous
• Input Voltage Range (V_IN): 4.5 V to 28 V
• Maximum Output Current (I_OUT): 3 A Continuous
• Switching Frequency (f_SW): 570 kHz Fixed
• Output Voltage Range (V_OUT): 0.8 V to V_IN
• Reference Voltage (V_REF): 0.8 V $\pm$ 2%
• Package: SOP-8 (DDAR)

Mechanical Specifications:

• Pin Count: 8 Pins
• Mounting: Surface Mount Device (SMD)
• Thermal Pad: Features an exposed thermal pad on the bottom (DDA package variant, compatible with DDAR) to dissipate heat efficiently.

Dimensions (SOP-8 DDAR):

• Body Length: ~4.9 mm
• Body Width: ~3.9 mm
• Pitch (Pin Spacing): 1.27 mm (0.05 in)

Pinout and Wiring:

• Pin 1 (GND): Ground connection.
• Pin 2 (V_FB): Feedback pin; you must connect it to the output via a resistor divider to set V_OUT.
• Pin 3 (COMP): Compensation pin for connecting the external feedback compensation network.
• Pin 4 (EN): Enable pin; pull high to enable the device, pull low to disable.
• Pin 5 (BOOT): Bootstrap pin; connect a small capacitor (e.g., 0.1 $\mu$F) between BOOT and SW.
• Pin 6 (VIN): Input power supply connection (4.5 V to 28 V).
• Pin 7 (SW): Switching node connection to the output inductor.
• Pin 8 (SW): Switching node connection (internally tied to Pin 7).
• Wiring Note: Place the input bypass capacitor close to VIN and GND. Use a large copper plane for the thermal pad and GND to ensure proper heat dissipation.

Datasheet Reference:

• Download Datasheet

Commonly Used in:

• Automotive Systems: Regulating power for car infotainment and control modules.
• Industrial Control: Generating logic power (3.3 V or 5 V) from 12 V or 24 V factory supplies.
• Network Equipment: Providing highly efficient local power regulation in routers, switches, and modems.

Applications:

• Post-Regulation Supply: Efficiently stepping down power from a primary rail to supply microcontrollers and digital logic.
• Battery-Powered Devices: Maximizing runtime by converting battery voltage to lower voltages with high efficiency.
• Distributed Power Systems: Creating isolated and regulated power zones across a larger circuit board.

Equivalent Models:

• LM2596: A classic, non-synchronous buck converter (requires an external diode and is typically less efficient).
• MP1584EN: A small, highly integrated buck converter offering similar current capabilities, often available in a smaller package.

Package Includes:

• 1 x TPS5430DDAR DC-DC Buck Switching Voltage Regulator SOP-8