Datasheet

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FEATURES APPLICATIONS

DESCRIPTION

VIN

ENA

GND

VSENSE

BOOT

TPS5420

VIN VOUT

100

0 0.5

1.5 2.5 3

Efficiency − %

I OutputCurrent A

EfficiencyvsOutputCurrent

SimplifiedSchematic

=12V

TPS5420-Q1

www.ti.com

................................................................................................................................................... SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008

2-A WIDE-INPUT-RANGE STEP-DOWN SWIFT™ CONVERTER

• Industrial and Car Audio Power Supplies

• Qualified for Automotive Applications

• Battery Chargers, High-Power LED Supplies

• Wide Input Voltage Range: 5.5 V to 36 V

• 12-V/24-V Distributed Power Systems

• Up to 2-A Continuous (3-A Peak) Output

Current

• High Efficiency up to 95% Enabled by 110-m Ω

As a member of the SWIFT family of dc/dc regulators,

Integrated MOSFET Switch

the TPS5420 is a high-output-current PWM converter

• Wide Output Voltage Range: Adjustable Down

that integrates a low-resistance high-side N-channel

to 1.22 V With 1.5% Initial Accuracy

MOSFET. Included on the substrate with the listed

• Internal Compensation Minimizes External

features is a high-performance voltage error amplifier

Parts Count

that provides tight voltage regulation accuracy under

transient conditions, an undervoltage-lockout circuit to

• Fixed 500-kHz Switching Frequency for Small

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

Filter Size

an internally set slow-start circuit to limit inrush

• Improved Line Regulation and Transient

currents, and a voltage feed-forward circuit to

Response by Input Voltage Feed Forward

improve the transient response. Using the ENA pin,

• System Protected by Over Current Limiting,

shutdown supply current is reduced to 18 µ A

typically. Other features include an active-high

Over Voltage Protection, and Thermal

enable, overcurrent limiting, overvoltage protection,

Shutdown

and thermal shutdown. To reduce design complexity

• – 40 ° C to 125 ° C Operating Junction

and external component count, the TPS5420

Temperature Range

feedback loop is internally compensated.

• Available in Small 8-Pin SOIC Package

The TPS5420 device is available in an easy-to-use

• For SWIFT™ Documentation, Application

8-pin SOIC package. TI provides evaluation modules

Notes and Design Software, See the TI Website

and the SWIFT Designer software tool to aid in

at www.ti.com/swift

quickly achieving high-performance power supply

designs to meet aggressive equipment development

cycles.

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 is a trademark 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)

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TPS5420-Q1 www.ti.com................................................................................................................................................... SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008 2-A WIDE-INPUT-RANGE STEP-DOWN SWIFT™ CONVERTER FEATURES APPLICATIONS • Qualified for Automotive Applications • Wide Input Voltage Range: 5.
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TPS5420-Q1 SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008................................................................................................................................................... www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates.
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TPS5420-Q1 www.ti.com................................................................................................................................................... SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008 ELECTRICAL CHARACTERISTICS TJ = –40°C to 125°C, VIN = 5.5 V to 36 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 3 4.4 mA 18 50 µA Start threshold voltage, UVLO 5.3 5.
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TPS5420-Q1 SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008................................................................................................................................................... www.ti.com PIN ASSIGNMENTS D PACKAGE (TOP VIEW) BOOT 1 8 PH NC 2 7 VIN NC 3 6 GND VSENSE 4 5 ENA TERMINAL FUNCTIONS TERMINAL NAME BOOT NC DESCRIPTION NO. 1 2, 3 Boost capacitor for the high-side FET gate driver. Connect 0.01-µF low ESR capacitor from BOOT pin to PH pin.
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TPS5420-Q1 www.ti.com................................................................................................................................................... SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008 TYPICAL CHARACTERISTICS OSCILLATOR FREQUENCY vs JUNCTION TEMPERATURE OPERATING QUIESCENT CURRENT vs JUNCTION TEMPERATURE 530 3.5 500 490 480 470 460 -50 170 Minimum Controllable On Time − ns 510 180 VI = 12 V IQ − Operating Quiescent Current − mA f − Oscillator Frequency − kHz 520 3.
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TPS5420-Q1 SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008................................................................................................................................................... www.ti.com APPLICATION INFORMATION FUNCTIONAL BLOCK DIAGRAM VIN VIN 1.
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TPS5420-Q1 www.ti.com................................................................................................................................................... SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008 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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TPS5420-Q1 SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008................................................................................................................................................... www.ti.com Sometimes, under serious overload conditions such as short-circuit, the overcurrent runaway may still occur 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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TPS5420-Q1 www.ti.com................................................................................................................................................... SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008 PH BOOT CAPACITOR OUTPUT INDUCTOR RESISTOR DIVIDER VOUT BOOT PH NC VIN NC GND VSENSE ENA OUTPUT FILTER CAPACITOR Route feedback trace under the output filter capacitor or on the other layer.
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TPS5420-Q1 0.050 SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008................................................................................................................................................... www.ti.com 0.026 0.220 0.080 All dimensions in inches Figure 10. TPS5420 Land Pattern Application Circuits Figure 11 shows the schematic for a typical TPS5420 application. The TPS5420 can provide up to 2-A output current at a nominal output voltage of 5 V.
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TPS5420-Q1 www.ti.com................................................................................................................................................... SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008 Design Procedure The following design procedure can be used to select component values for the TPS5420. Alternately, the SWIFT Designer Software may be used to generate a complete design.
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TPS5420-Q1 SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008................................................................................................................................................... www.ti.com CAUTION: The maximum ratings for voltage and current are not to be exceeded under any circumstance. Additionally, some bulk capacitance may be needed, especially if the TPS5420 circuit is not located within approximately two inches from the input voltage source.
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TPS5420-Q1 www.ti.com................................................................................................................................................... SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008 the design of the internal compensation, it is recommended to keep the closed-loop crossover frequency in the range 3 kHz to 30 kHz, as this frequency range has adequate phase boost to allow for stable operation.
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TPS5420-Q1 SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008................................................................................................................................................... www.ti.com Output Voltage Setpoint The output voltage of the TPS5420 is set by a resistor divider (R1 and R2) from the output to the VSENSE pin. Calculate the R2 resistor value for the output voltage of 5 V using Equation 12: R1 1.221 R2 + V * 1.
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TPS5420-Q1 www.ti.com................................................................................................................................................... SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008 VIN 10-24 V 7 VIN C1 4.7 mF EN 5 2 3 6 U1 TPS5420D VIN ENA BOOT NC PH L1 18 mH C2 0.01 mF 3.3 V 1 VOUT 8 C3 47 mF D1 MRBS340 NC VSNS 4 GND PwPd 9 R1 10 kW C7 0.1 mF C4 150 pF C4 47 mF R2 5.9 kW C6 1800 pF R3 549 W Figure 13.
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TPS5420-Q1 SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008................................................................................................................................................... www.ti.com The network composed of R1, R2, R3, C5, C6, and C7 has two poles and two zeros that are used to tailor the overall response of the feedback network to accommodate the use of the ceramic output capacitors.
PAGE 17
TPS5420-Q1 www.ti.com................................................................................................................................................... SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008 The lower limit is constrained by the minimum controllable on time, which may be as high as 200 ns. The approximate minimum output voltage for a given input voltage and minimum load current is given by: V OUTMIN + 0.12 ǒǒVINMAX * I OMIN Ǔ Ǔ ǒ 0.
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TPS5420-Q1 SLVS752B – NOVEMBER 2007 – REVISED JUNE 2008................................................................................................................................................... www.ti.com PERFORMANCE GRAPHS The performance graphs (Figure 14 through Figure 20) are applicable to the circuit in Figure 11, TA = 25°C (unless otherwise specified) 100 VI = 10.8 V 0.3 0.2 0.2 VI = 12 V IO = 2 A Output Regulation - % VI = 15 V 90 85 VI = 18 V VI = 19.
PAGE 19
PACKAGE OPTION ADDENDUM www.ti.com 24-Jan-2013 PACKAGING INFORMATION Orderable Device Status (1) TPS5420QDRQ1 ACTIVE Package Type Package Pins Package Qty Drawing SOIC D 8 2500 Eco Plan Lead/Ball Finish (2) Green (RoHS & no Sb/Br) MSL Peak Temp Op Temp (°C) Top-Side Markings (3) CU NIPDAU Level-1-260C-UNLIM (4) -40 to 125 5420Q1 (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Mar-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device TPS5420QDRQ1 Package Package Pins Type Drawing SOIC D 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 14-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS5420QDRQ1 SOIC D 8 2500 367.0 367.0 35.
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