TPS5430-Q1

Part: TPS5430, TPS5431 — Texas Instruments

Type: Synchronous Buck Converter

Description: The TPS543x is a 3 A, wide input range, step-down converter with an integrated 100 mΩ high-side N-channel MOSFET, offering up to 95% efficiency and adjustable output voltage down to 1.22 V with 1.5% initial accuracy.

Operating Conditions:

• Supply voltage: 5.5–36 V (TPS5430), 5.5–23 V (TPS5431)
• Operating temperature: -40 to 125 °C (junction)
• Switching frequency: 500 kHz (fixed)

Absolute Maximum Ratings:

• Max supply voltage: 40 V (TPS5430), 25 V (TPS5431)
• Max junction/storage temperature: 150 °C

Key Specs:

• Output current: Up to 3 A continuous (4 A peak)
• High-side MOSFET on-resistance: 100 mΩ (typ, VIN = 12 V)
• Output voltage accuracy: 1.5% initial accuracy (down to 1.22 V)
• VIN quiescent current: 2 mA (typ, non-switching)
• VIN shutdown supply current: 15 μA (typ, ENA = 0 V)
• High-side peak current limit: 5.0 A (typ)
• Thermal shutdown threshold: 162 °C (typ)
• Internal slow-start time: 8 ms (typ)

Features:

• Wide input voltage range
• High efficiency up to 95%
• Wide output voltage range: adjustable down to 1.22V
• Internal compensation minimizes external parts count
• Fixed 500kHz switching frequency
• Improved line regulation and transient response by input voltage feedforward
• System protected by overcurrent limiting, overvoltage protection, and thermal shutdown
• -40°C to 125°C operating junction temperature range
• Internal slow-start circuit
• Undervoltage lockout (UVLO)

Applications:

• Consumer: set-top box, DVD, LCD displays
• Industrial and car audio power supplies
• Battery chargers, high-power LED supply
• 12V and 24V distributed power systems

Package:

• DDA (HSOP, 8-pin SOIC PowerPAD)

• Wide input voltage range:

• Up to 3A continuous (4A peak) output current

• High efficiency up to 95% enabled by 100mΩ integrated MOSFET switch

• Wide output voltage range: adjustable down to 1.22V with 1.5% initial accuracy

• Internal compensation minimizes external parts count

• Fixed 500kHz switching frequency for small filter size

• Improved line regulation and transient response by input voltage feedforward

• System protected by overcurrent limiting, overvoltage protection, and thermal shutdown

• -40°C to 125°C operating junction temperature range

• Available in small thermally enhanced 8-pin SO PowerPAD ™ integrated circuit package

• Create a custom design using the TPS5430 with the WEBENCH ® Power Designer

• TPS5430: 5.5V to 36V

• TPS5431: 5.5V to 23V

• Consumer: set-top box, DVD, LCD displays
• Industrial and car audio power supplies
• Battery chargers, high-power LED supply
• 12V and 24V distributed power systems

Figure 4-1. DDA Package 8-Pin SOIC with Thermal Pad Top View

TJ = -40°C to +125°C, VIN = 5.5 V to 36 V. Typical values are at T J = 25°C and V IN = 12 V (unless otherwise noted)

Over operating junction temperature range (unless otherwise noted) (1)

Over operating junction temperature range (unless otherwise noted)

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(2) Refer to the EVM User's Guide for board layout and additional information. For thermal design information please see the Maximum Ambient Temperature section.

(3) The value of RΘJA given in this table is only valid for comparison with other packages and cannot be used for design purposes. These values were calculated in accordance with JESD 51-7, and simulated on a 4-layer JEDEC board. They do not represent the performance obtained in an actual application. For example, the EVM RΘJA = TBD °C /W. For design information please see the Maximum Ambient Temperature section.

The TPS543x is a 3-A, step down regulator with an integrated high side MOSFET. This device is typically used to convert a higher DC voltage to a lower DC voltage with a maximum available output current of 3 A. Example applications are: High Density Point-of-Load Regulators for Set-top Box, DVD, LCD and Plasma Displays, High Power LED Supply, Car Audio, Battery Chargers, and other 12-V and 24-V Distributed Power Systems. Use the following design procedure to select component values for the TPS543x. This procedure illustrates the design of a high frequency switching regulator. Alternatively, use the WEBENCH® software to generate a complete design. The WEBENCH software uses an iterative design procedure and accesses a comprehensive database of components when generating a design.

To begin the design process a few parameters must be decided upon. The designer needs to know the following:

• Input voltage range
• Output voltage
• Input ripple voltage
• Output ripple voltage
• Output current rating
• Operating frequency