TPS5430

Part: TPS5430DDAR (TPS543x family) — Texas Instruments

Type: Step-Down (Buck) Converter with integrated high-side MOSFET

Description: 5.5–36 V input (TPS5430), 3 A continuous (4 A peak) step-down converter with a 100 mΩ integrated high-side MOSFET, 500 kHz fixed switching frequency, and up to 95% efficiency.

Operating Conditions:

• Supply voltage: 5.5–36 V (TPS5430); 5.5–23 V (TPS5431)
• Operating junction temperature: -40 to 125 °C
• Output voltage: adjustable down to 1.221 V reference; fixed 500 kHz switching frequency

Absolute Maximum Ratings:

• Max supply voltage (VIN to GND): 40 V (TPS5430); 25 V (TPS5431)
• PH to GND steady-state: 40 V (TPS5430); 25 V (TPS5431)
• ENA to GND: 7 V; VSENSE to GND: 3 V; BOOT to PH: 6 V
• Max operating junction temperature: 150 °C
• Storage temperature: -65 to 150 °C

Key Specs:

• Feedback voltage VFB: 1.221 V typ (1.202–1.239 V at TJ = 25 °C; 1.196–1.245 V over -40 to 125 °C)
• Switching frequency: 500 kHz typ (400–600 kHz)
• High-side MOSFET RDS(on): 100 mΩ typ, 230 mΩ max (VIN = 12 V, VBOOT-SW = 4.5 V)
• High-side peak current limit: 4.0 / 5.0 / 6.0 A (min/typ/max)
• Quiescent current (non-switching): 2 mA typ, 4.4 mA max
• Shutdown supply current (ENA = 0 V): 15 μA typ, 50 μA max
• UVLO rising threshold: 5.3 V typ, 5.5 V max; hysteresis 0.35 V typ
• Maximum duty cycle: 89% typ (fSW = 500 kHz); minimum on-time 150 ns typ
• Internal slow-start: 8 ms typ; thermal shutdown 162 °C typ with 14 °C hysteresis

Features:

• Up to 3 A continuous (4 A peak) output current
• Internal compensation minimizes external parts count
• Input voltage feedforward for improved line regulation and transient response
• Overcurrent limiting with hiccup mode, overvoltage protection, and thermal shutdown
• Internal slow start and integrated bootstrap recharge diode
• Active-high enable with internal 1.5 MΩ pullup
• 1.5% initial reference accuracy

Applications:

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

Package:

• DDA (HSOIC, 8-pin, thermally enhanced 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 HSOIC With Thermal Pad (Top View)

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

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

• (2) Approaching the absolute maximum rating for the VIN pin can cause the voltage on the PH pin to exceed the absolute maximum rating.

(3) BOOT to PH Abs MAX voltage is the maximum voltage that can be applied between BOOT and PH. Some devices develop voltage above 6V but below 10V during operation. These devices are not damaged by this voltage. Because some devices develop voltage above 6V during operation, capacitors placed between BOOT and PH must be rated for at least 10V operation.

Over operating junction temperature range (unless otherwise noted)

The TPS543x is a 3A, 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 3A. 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 12V and 24V 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

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