TPS54334

Part: TPS54334 (DDA 8-pin SO PowerPAD / DRC 10-pin VSON) — Texas Instruments

Type: Synchronous Step-Down (Buck) Converter

Description: 4.2–28 V input, 3 A synchronous buck converter with integrated 128 mΩ/84 mΩ MOSFETs, 570 kHz fixed-frequency current-mode control, and 2 μA shutdown supply current.

Operating Conditions:

• Supply voltage: 4.2–28 V
• Operating junction temperature: -40 to 150 °C
• Output voltage: 0.8–24 V
• Output current: 0–3 A

Absolute Maximum Ratings:

• Max supply voltage (VIN): 30 V
• Operating junction temperature: -40 to 150 °C
• Storage temperature: -65 to 150 °C
• SW pin: -1 to 30 V (-3.5 V for 10 ns transient)
• EN pin: -0.3 to 6 V

Key Specs:

• Reference voltage: 0.8 V typ; 0.792–0.808 V at TJ = 25 °C, 0.788–0.812 V over TJ = -40 to 150 °C
• Shutdown supply current (EN = 0 V): 2 μA typ, 10 μA max
• Operating non-switching supply current (VSENSE = 810 mV): 310 μA typ, 800 μA max
• High-side RDS(on): 128 mΩ typ (240 mΩ max) at BOOT-SW = 6 V
• Low-side RDS(on): 84 mΩ typ, 170 mΩ max
• High-side current limit: 4–6.5 A (5.2 A typ)
• Switching frequency: 570 kHz typ (456–684 kHz)
• Input UVLO rising threshold: 3.9 V typ, 4.2 V max
• Minimum on-time: 94 ns typ, 145 ns max (ISW = 2 A)
• Thermal shutdown: 165 °C typ, 10 °C hysteresis
• Internal slow start: 2 ms typ

Features:

• Two 128 mΩ/84 mΩ MOSFETs for 3 A continuous output current
• Power Good output
• 0.8 V reference with ±1.5% accuracy over temperature
• Fixed-frequency current mode control
• Pulse skipping for light-load efficiency
• Overcurrent protection on both MOSFETs with hiccup mode
• Thermal and overvoltage transient protection
• Monotonic start-up into pre-biased outputs

Applications:

• Consumer: digital TV, set-top box, DVD/Blu-ray, LCD display, cable modem, WiFi router, DLP projectors, smart meters
• Battery chargers
• Industrial and car audio power supplies
• 5 V, 12 V and 24 V distributed power bus supplies

Package:

• SO PowerPAD, 8-pin (DDA): 4.89 mm × 3.90 mm
• VSON, 10-pin (DRC): 3.0 mm × 3.0 mm

• 1 · Two 128m Ω /84m Ω MOSFETs for 3A Continuous Output Current
• Power Good
• Low 2 μA Shutdown Quiescent Current
• 0.8 V Internal Voltage Reference with ±1.5% Accuracy Over Temperature
• Fixed-Frequency Current Mode Control
• Pulse Skipping Boosts Efficiency at Light Loads
• Overcurrent Protection for Both MOSFETs with Hiccup Mode for Severe Fault Conditions
• Thermal and Overvoltage Transient Protection
• Available in Easy-to-Use 8-Pin SOIC PowerPAD™ and 10-Pin SON
• Monotonic Start-Up into Pre-biased Outputs

• Consumer Applications such as a Digital TV (DTV), Set Top Box (STB, DVD/Blu-ray Player), LCD Display, CPE (Cable Modem, WiFi Router), DLP Projectors, Smart Meters
• Battery Chargers
• Industrial and Car Audio Power Supplies
• 5V,12 and 24V Distributed Power Bus Supply

The Electrical Ratings specified in this section will apply to all specifications in this document unless otherwise noted. These specifications will be interpreted as conditions that will not degrade the device's parametric or functional specifications for the life of the product containing it. T J = -40°C to 150°C, VIN =4.2 to 28V, (unless otherwise noted)

over operating free-air temperature range (unless otherwise noted) (1)(2)

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

The following design procedure can be used to select component values for the TPS54334. Alternately, the WEBENCH ® software may be used to generate a complete design. The WEBENCH ® software uses an iterative design procedure and accesses a comprehensive database of components when generating a design. This section presents a simplified discussion of the design process using the TPS54334.