TPS54302

Part: TPS54302 — Texas Instruments

Type: Synchronous Step-Down (Buck) Converter

Description: 4.5–28 V input, 3 A output synchronous buck converter with integrated 85 mΩ/40 mΩ MOSFETs, fixed 400 kHz switching with spread spectrum, 45 μA quiescent current, in a SOT-23-THIN 6-pin package.

Operating Conditions:

• Supply voltage: 4.5–28 V
• Operating junction temperature: -40 to 125 °C
• Output voltage: up to 5.5 V per recommended operating conditions
• Switching frequency: fixed 400 kHz (center, with spread spectrum)

Absolute Maximum Ratings:

• Max input voltage (VIN): 30 V
• Max SW voltage: 30 V (-5 V to 30 V for 20 ns transient)
• Max EN / FB voltage: 7 V
• Max BOOT-SW voltage: 7 V
• Max junction temperature: 150 °C
• Storage temperature: -65 to 150 °C

Key Specs:

• Non-switching quiescent current: 45 μA typ (EN = 5 V, VFB = 1 V)
• Shutdown current: 2 μA typ (EN = GND)
• Feedback voltage: 0.596 V typ (0.581–0.611 V, VIN = 12 V)
• High-side / low-side FET on-resistance: 85 mΩ / 40 mΩ typ (TA = 25 °C)
• High-side current limit: 4 / 5 / 6 A (min/typ/max)
• Low-side source current limit: 3.1 / 4 / 5.5 A (min/typ/max)
• Switching frequency: 290 / 400 / 510 kHz (min/typ/max)
• VIN UVLO: 4.1 V typ rising, 3.6 V typ falling
• Soft-start time: 5 ms; minimum on-time: 110 ns typ
• Thermal shutdown: 160 °C typ with 10 °C hysteresis

Features:

• 4.5–28 V wide input voltage range
• Integrated MOSFETs for 3 A continuous output current
• Internal 5 ms soft start
• Frequency spread spectrum to reduce EMI
• Advanced Eco-mode pulse skip for light-load efficiency
• Peak current mode control with internal loop compensation
• Overcurrent protection for both MOSFETs with hiccup mode
• Overvoltage protection
• Thermal shutdown
• Safe start-up into prebiased outputs

Applications:

• 12 V, 24 V distributed power-bus supply
• Industrial applications
• White goods
• Consumer applications
• Audio
• STB, DTV
• Printers

Package:

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

• 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

Figure 4-1. DDC Package 6-Pin SOT-23-THIN (Top View)

Table 4-1. Pin Functions

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