Datasheet

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FEATURES SUPPORTS DEFENSE, AEROSPACE,

DESCRIPTION

APPLICATIONS

TPS5450-EP

www.ti.com

....................................................................................................................................................................................................... SLVS935 – JULY 2009

5-A, WIDE INPUT RANGE, STEP-DOWN SWIFT™ CONVERTER

AND MEDICAL APPLICATIONS

• Qualified for Automotive Applications

• Controlled Baseline

• Wide Input Voltage Range: 5.5 V to 36 V

• One Assembly/Test Site

• Up to 5-A Continuous (6-A Peak) Output

• One Fabrication Site

Current

• Available in Military ( – 55 ° C/125 ° C)

• High Efficiency Greater than 90% Enabled by

Temperature Range

(1)

110-m Ω Integrated MOSFET Switch

• Extended Product Life Cycle

• Wide Output Voltage Range: Adjustable Down

• Extended Product-Change Notification

to 1.22 V with 1.5% Initial Accuracy

• Product Traceability

• Internal Compensation Minimizes External

Parts Count

• Fixed 500-kHz Switching Frequency for Small

As a member of the SWIFT™ family of DC/DC

Filter Size

regulators, the TPS5450 is a high-output-current

• 18- µ A Shutdown Supply Current

PWM converter that integrates a low-resistance

• Improved Line Regulation and Transient

high-side N-channel MOSFET. Included on the

Response by Input Voltage Feed Forward

substrate with the listed features are a

high-performance voltage error amplifier that provides

• System Protected by Overcurrent Limiting,

tight voltage regulation accuracy under transient

Overvoltage Protection, and Thermal

conditions, an undervoltage-lockout circuit to prevent

Shutdown

start-up until the input voltage reaches 5.5 V, an

• Available in Small Thermally Enhanced 8-Pin

internally set slow-start circuit to limit inrush currents,

SOIC PowerPAD™ Package

and a voltage feed-forward circuit to improve the

transient response. Using the ENA pin, shutdown

• For SWIFT™ Documentation, Application

supply current is reduced to 18 µ A typically. Other

Reports and Design Software, See the TI

features include an active-high enable, overcurrent

Website at www.ti.com/swift

limiting, overvoltage protection, and thermal

shutdown. To reduce design complexity and external

component count, the TPS5450 feedback loop is

• High-Density Point-of-Load Regulators

internally compensated.

• LCD Displays, Plasma Displays

The TPS5450 device is available in a thermally

• Battery Chargers

enhanced, 8-pin SOIC PowerPAD™ package. TI

• 12-V/24-V Distributed Power Systems

provides evaluation modules and software tools to aid

in achieving high-performance power supply designs

to meet aggressive equipment development cycles.

(1) Additional temperature ranges are available - contact factory

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

2 SWIFT, PowerPAD are trademarks of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

Summary of content (25 pages)

PAGE 1
TPS5450-EP www.ti.com ....................................................................................................................................................................................................... SLVS935 – JULY 2009 5-A, WIDE INPUT RANGE, STEP-DOWN SWIFT™ CONVERTER FEATURES 1 • Qualified for Automotive Applications • Wide Input Voltage Range: 5.
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TPS5450-EP SLVS935 – JULY 2009 ....................................................................................................................................................................................................... www.ti.
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TPS5450-EP www.ti.com ....................................................................................................................................................................................................... SLVS935 – JULY 2009 DISSIPATION RATINGS (1) (1) (2) (3) (2) PACKAGE THERMAL IMPEDANCE JUNCTION-TO-AMBIENT 8-Pin DDA (4-layer board with solder) (3) 30°C/W Maximum power dissipation may be limited by overcurrent protection.
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TPS5450-EP SLVS935 – JULY 2009 ....................................................................................................................................................................................................... www.ti.com ELECTRICAL CHARACTERISTICS (continued) TJ = –55°C to 125°C, VIN = 5.5 V to 36 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT OUTPUT MOSFET rDS(on) High-side power MOSFET switch VIN = 5.
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TPS5450-EP www.ti.com ....................................................................................................................................................................................................... SLVS935 – JULY 2009 TYPICAL CHARACTERISTICS OSCILLATOR FREQUENCY vs JUNCTION TEMPERATURE NON-SWITCHING QUIESCENT CURRENT vs JUNCTION TEMPERATURE 530 3.5 VI = 12 V I Q−Quiescent Current −mA f − Oscillator Frequency − kHz 520 510 500 490 480 3.25 3 2.
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TPS5450-EP SLVS935 – JULY 2009 ....................................................................................................................................................................................................... www.ti.com TYPICAL CHARACTERISTICS (continued) MINIMUM CONTROLLABLE ON TIME vs JUNCTION TEMPERATURE MINIMUM CONTROLLABLE DUTY RATIO vs JUNCTION TEMPERATURE 8 170 7.75 Minimum Duty Ratio - % Minimum Controllable On Time − ns 180 160 150 140 7.50 7.
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TPS5450-EP www.ti.com ....................................................................................................................................................................................................... SLVS935 – JULY 2009 APPLICATION INFORMATION FUNCTIONAL BLOCK DIAGRAM VIN VIN 1.
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TPS5450-EP SLVS935 – JULY 2009 ....................................................................................................................................................................................................... www.ti.com The ENA pin has an internal pullup current source, allowing the user to float the ENA pin. If an application requires controlling the ENA pin, use open drain or open collector output logic to interface with the pin.
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TPS5450-EP www.ti.com ....................................................................................................................................................................................................... SLVS935 – JULY 2009 Sometimes under serious overload conditions such as short-circuit, the overcurrent runaway may still happen when using cycle-by-cycle current limiting. A second mode of current limiting is used, i.e. hiccup mode overcurrent limiting.
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TPS5450-EP SLVS935 – JULY 2009 ....................................................................................................................................................................................................... www.ti.
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TPS5450-EP www.ti.com ....................................................................................................................................................................................................... SLVS935 – JULY 2009 Application Circuits Figure 11 shows the schematic for a typical TPS5450 application. The TPS5450 can provide up to 5-A output current at a nominal output voltage of 5 V.
PAGE 12
TPS5450-EP SLVS935 – JULY 2009 ....................................................................................................................................................................................................... www.ti.com Switching Frequency The switching frequency for the TPS5450 is internally set to 500 kHz. It is not possible to adjust the switching frequency.
PAGE 13
TPS5450-EP www.ti.com ....................................................................................................................................................................................................... SLVS935 – JULY 2009 For the output filter inductor it is important that the RMS current and saturation current ratings not be exceeded.
PAGE 14
TPS5450-EP SLVS935 – JULY 2009 ....................................................................................................................................................................................................... www.ti.com For this design example, a single 330-µF output capacitor is chosen for C3. The calculated RMS ripple current is 143 mA and the maximum ESR required is 40 mΩ.
PAGE 15
TPS5450-EP www.ti.com ....................................................................................................................................................................................................... SLVS935 – JULY 2009 Where VINMIN = minimum input voltage IOMAX = maximum load current VD = catch diode forward voltage. RL= output inductor series resistance. This equation assumes maximum on resistance for the internal high side FET.
PAGE 16
TPS5450-EP SLVS935 – JULY 2009 ....................................................................................................................................................................................................... www.ti.com PERFORMANCE GRAPHS The performance graphs (Figure 12 through Figure 18) are applicable to the circuit in Figure 11. Ta = 25 °C. unless otherwise specified. 0.3 100 0.
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TPS5450-EP www.ti.com ....................................................................................................................................................................................................... SLVS935 – JULY 2009 VOUT = 50 mV/div (AC Coupled, 20 MHz BWL) VOUT = 50 mV/div (AC Coupled, 20 MHz BWL) VPH = 10 V/div IOUT = 1 A/div t - Time = 1 ms/div t - Time = 100 ms/div Figure 16. Output Voltage Ripple and PH Node, Io = 5 A Figure 17. Transient Response, Io Step 1.25 to 3.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device TPS5450MDDAREP Package Package Pins Type Drawing SO Power PAD DDA 8 SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 2500 330.0 12.4 Pack Materials-Page 1 6.4 B0 (mm) K0 (mm) P1 (mm) 5.2 2.1 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS5450MDDAREP SO PowerPAD DDA 8 2500 367.0 367.0 35.
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