TPS5430DDA.A

Part: TPS5430, TPS5431 from Texas Instruments

Type: Synchronous Buck Converter

Key Specs:

• Input Voltage Range (TPS5430): 5.5V to 36V
• Input Voltage Range (TPS5431): 5.5V to 23V
• Continuous Output Current: Up to 3A
• Peak Output Current: 4A
• Efficiency: Up to 95%
• Integrated MOSFET Switch Resistance: 100mΩ
• Output Voltage Range: Adjustable down to 1.22V
• Output Voltage Accuracy: 1.5% initial
• Switching Frequency: Fixed 500kHz
• Operating Junction Temperature: –40°C to 125°C

Features:

• Wide input voltage range (TPS5430: 5.5V to 36V, TPS5431: 5.5V to 23V)
• 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

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:

• 8-pin SO PowerPAD™ integrated circuit package
• DDA (HSOP, 8)

• Wide input voltage range:
  • TPS5430: 5.5V to 36V
  • TPS5431: 5.5V to 23V
• 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

• 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

3 Description

The TPS543x is a high-output-current PWM converter that integrates a low-resistance, high-side N-channel MOSFET. Included on the substrate with the listed features are a high-performance voltage error amplifier that provides tight voltage regulation accuracy under transient conditions; an undervoltagelockout circuit to prevent start-up until the input voltage reaches 5.5V; an internally set slow-start circuit to limit inrush currents; and a voltage feedforward circuit to improve the transient response. Using the ENA pin, shutdown supply current is reduced to 15μA typically. Other features include an active-high enable, overcurrent limiting, overvoltage protection and thermal shutdown. To reduce design complexity and external component count, the TPS543x feedback loop is internally compensated. The TPS5431 is intended to operate from power rails up to 23V. The TPS5430 regulates a wide variety of power sources including 24V bus.

The TPS543x device is available in a thermally enhanced, easy to use 8-pin SOIC PowerPAD integrated circuit package. TI provides evaluation modules and the Designer software tool to aid in quickly achieving high-performance power supply designs to meet aggressive equipment development cycles.

Device Information

(1) For more information, see Section 10.

Simplified Schematic Efficiency vs Output Current

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

Table 4-1. Pin Functions

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

(1) Parameter specified by design, statistical analysis and production testing of correlated parameters. Not production tested.

Over operating junction 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.

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

Over operating junction temperature range (unless otherwise noted)

Table 4-1. Pin Functions