TPS54302DDCT.B

Part: TPS54302 from Texas Instruments

Type: Synchronous Buck Converter

Description: The TPS54302 is a 4.5V to 28V input, 3A output synchronous buck converter with integrated MOSFETs, fixed 400kHz switching frequency, and EMI-friendly features.

Operating Conditions:

• Supply voltage: 4.5–28 V
• Operating temperature: -40 to 125 °C (junction)
• Max continuous output current: 3 A
• Switching frequency: 400 kHz (fixed)

Absolute Maximum Ratings:

• Max supply voltage: 30 V (VIN)
• Max continuous current: 3 A (output current, based on integrated MOSFETs)
• Max junction/storage temperature: 150 °C

Key Specs:

• Input voltage range (VIN): 4.5–28 V
• Non switching quiescent current (IQ): 45 μA (EN = 5V, VFB = 1V)
• Shut down current (IOFF): 2 μA (EN = GND)
• Feedback Voltage (VFB): 0.596 V (VIN = 12V)
• High-side FET on resistance (R(HSD)): 85 mΩ (TA = 25°C, VBST – SW = 5V)
• Low-side FET on resistance (R(LSD)): 40 mΩ (TA = 25°C, VIN = 12V)
• High-side current limit (I(LIM_HS)): 5 A (typical, maximum inductor peak current)
• Centre switching frequency (fSW): 400 kHz

Features:

• 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

Applications:

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

Package:

• DDC (SOT-23-THIN, 6)

• 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

(1) O = output; I = input

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. T^J = –40°C to +125°C, VIN = 4.5V to 28V, (unless otherwise noted).

⁽¹⁾ Not production tested

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

⁽¹⁾ Operation outside the Absolute Maximum Ratings may cause permanent device damage. Absolute Maximum Ratings do not imply functional operation of the device at these or any other conditions beyond those listed under Recommended Operating Conditions. If used outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not be fully functional, and this may affect device reliability, functionality, performance, and shorten the device lifetime.

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

⁽¹⁾ For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application note.

Product Folder Links: TPS54302

⁽²⁾ JEDEC document JEP157 states that 250V CDM allows safe manufacturing with a standard ESD control process.

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.

Efficiency vs Output Current