Part: TPS54302 — Texas Instruments

Type: Synchronous Buck Converter

Description: A 4.5–28 V input, 3 A synchronous buck converter with integrated 85 mΩ high-side and 40 mΩ low-side MOSFETs, fixed 400 kHz switching frequency, and frequency spread spectrum for EMI reduction.

Operating Conditions:

• Supply voltage: 4.5–28 V
• Operating junction temperature: -40 to 125 °C
• Output voltage: -0.1 to 5.5 V

Absolute Maximum Ratings:

• Max supply voltage (VIN): 30 V
• Max junction temperature: 150 °C
• Max storage temperature: 150 °C

Key Specs:

• Continuous output current: 3 A
• Non-switching quiescent current: 45 μA (EN = 5V, VFB = 1V)
• Shutdown current: 2 μA (EN = GND)
• High-side FET on resistance: 85 mΩ (TA = 25°C, VBST - SW = 5V)
• Low-side FET on resistance: 40 mΩ (TA = 25°C, VIN = 12V)
• High-side current limit: 5 A (typical, maximum inductor peak current)
• Centre switching frequency: 400 kHz
• Thermal shutdown: 160 °C (rising temperature)
• Soft-start time: 5 ms

Features:

• Integrated 85mΩ and 40mΩ MOSFETs
• Low 2μA shutdown, 45μA quiescent current
• Internal 5ms soft start
• Fixed 400kHz switching frequency
• Frequency spread spectrum to reduce EMI
• Advanced Eco-mode pulse skip
• Peak current mode control
• Internal loop compensation
• Overcurrent protection for both MOSFETs with hiccup mode protection
• Overvoltage protection
• Thermal shutdown

Applications:

• 12V, 24V distributed power-bus supply
• White goods
• Audio
• STB, DTV
• Printer

Package:

• DDC (SOT-23-THIN, 6) (2.9mm × 2.8mm)

• 4.5V to 28V wide input voltage range
• Integrated 85mΩ and 40mΩ MOSFETs for 3A, continuous output current
• Low 2μA shutdown, 45μA quiescent current
• Internal 5ms soft start
• Fixed 400kHz switching frequency
• Frequency spread spectrum to reduce EMI
• Advanced Eco-mode pulse skip
• Peak current mode control
• Internal loop compensation
• Overcurrent protection for both MOSFETs with hiccup mode protection
• Overvoltage protection
• Thermal shutdown
• SOT-23 (6) package

• 12V, 24V distributed power-bus supply
• Industry application
• -White goods
• Consumer application
• -Audio
• -STB, DTV
• -Printer

Simplified Schematic

Simplified Schematic

TPS54302DDCR Pinout

Package: SOT-23-6 (TSOT-23-6)

Notes

• Pin diagram confirms the pin numbering from the text table.
• Type designations: I = Input, O = Output, - = Power/Ground.
• BOOT and SW must be connected with a 0.1μF capacitor for proper gate drive operation.

The electrical ratings specified in this section apply to all specifications in this document, unless otherwise noted. These specifications are interpreted as conditions that do not degrade the device parametric or functional specifications for the life of the product containing it. TJ = -40°C to +125°C, VIN = 4.5V to 28V, (unless otherwise noted).

over operating free-air temperature range (unless otherwise noted) (1)

over operating free-air temperature range (unless otherwise noted)

The TPS54302 device is typically used as a step-down converter, which converts an input voltage from 8V to 28V to a fixed output voltage of 5V.

• (1) For more information, see Section 10.
• (2) The package size (length × width) is a nominal value and includes pins, where applicable.

D100

Efficiency vs Output Current