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TPS5402

www.ti.com

SLVSBK4 –SEPTEMBER 2012

3.5-V TO 28-V INPUT VOLTAGE, 1.7-A OUTPUT CURRENT,

NON-SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED MOSFET

Check for Samples: TPS5402

FEATURES

• 3.5-V to 28-V Wide Input Voltage Range APPLICATIONS

• Up to 1.7-A Maximum Continuous Output

• 5-V, 9-V, 12-V and 24-V Distributed Power

Loading Current

Systems

• Pulse Skipping Mode to Achieve High Light

• Consumer Applications Such as Home

Load Efficiency

Appliances, Set-Top Boxes, CPE Equipment,

LCD Displays, Peripherals, and Battery

• High Light Load Efficiency

Chargers

• Frequency Spread Spectrum to Reduce EMI

• Industrial and Car Entertainment Power

• Adjustable 50-kHz to 1.1-MHz Switching

Supplies

Frequency Set by an External Resistor

(Leave pin ROSC floating. Set frequency to

120 kHz and ground connection to 70 kHz)

• Frequency Spread Spectrum to Ease EMI Issue

• Peak Current-Mode Control

• Cycle-by-Cycle Over Current Protection

• External Soft Start

• Available in SOIC8 Package

DESCRIPTION

The TPS5402 is a monolithic non-synchronous buck regulator with wide operating input voltage range from 3.5 V

to 28 V. Current mode control with internal slope compensation is implemented to reduce component count.

TPS5402 also features a light load pulse skipping mode, which allows for a power loss reduction from the input

power supply to the system at light loading.

The switching frequency of the converters can be set from 50 kHz to 1.1 MHz with an external resistor.

Frequency spread spectrum operation is introduced for EMI reduction.

A cycle-by-cycle current limit with frequency fold back protects the IC at over loading condition.

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.

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 (18 pages)

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TPS5402 www.ti.com SLVSBK4 – SEPTEMBER 2012 3.5-V TO 28-V INPUT VOLTAGE, 1.7-A OUTPUT CURRENT, NON-SYNCHRONOUS STEP-DOWN REGULATOR WITH INTEGRATED MOSFET Check for Samples: TPS5402 FEATURES 1 • • • • • • • • • • • 3.5-V to 28-V Wide Input Voltage Range Up to 1.7-A Maximum Continuous Output Loading Current Pulse Skipping Mode to Achieve High Light Load Efficiency High Light Load Efficiency Frequency Spread Spectrum to Reduce EMI Adjustable 50-kHz to 1.
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TPS5402 SLVSBK4 – SEPTEMBER 2012 www.ti.com This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure.
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TPS5402 www.ti.com SLVSBK4 – SEPTEMBER 2012 PCB LAYOUT VOUT GROUND LX 8 1 BOOT VIN 2 VIN GND 7 3 ROSC 4 SS COMP 6 VSENSE 5 ORDERING INFORMATION (1) TA PACKAGE –40°C to 85°C (1) (2) (2) ORDERABLE PART NUMBER TOP-SIDE MARKING TPS5402DR TPS5402 8-pin SOIC (D) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. Package drawings, thermal data, and symbolization are available at www.ti.
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TPS5402 SLVSBK4 – SEPTEMBER 2012 www.ti.com ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) Voltage range at VIN, LX –0.3 to 30 V Voltage range at LX (maximum withstand voltage transient < 20 ns) –5 to 30 V Voltage from BOOT to LX –0.3 to 7 V Voltage at VSENSE –0.3 to 7 V Voltage at SS –0.3 to 3 V Voltage at ROSC –0.3 to 3 V Voltage at COMP –0.3 to 3 V Voltage at GND –0.3 to 0.
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TPS5402 www.ti.com SLVSBK4 – SEPTEMBER 2012 ELECTRICAL CHARACTERISTICS TA = -40°C to 125°C, VIN = 12 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT INPUT SUPPLY VIN Input Voltage range IDDQ_nsw Non switching quiescent power supply current 3.5 UVLO VIN under voltage lockout VSENSE > 0.9 V 28 100 V µA Rising VIN 3.
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TPS5402 SLVSBK4 – SEPTEMBER 2012 www.ti.com TYPICAL CHARACTERISTICS TA = 25°C, VIN = 12 V, VOUT = 3.3 V, fSW = 120 kHz (unless otherwise noted) 90.00% 87.00% 86.00% 88.00% 85.00% 84.00% Efficiency (%) Efficiency (%) 86.00% 84.00% 82.00% 83.00% 82.00% 81.00% 80.00% 80.00% 79.00% 78.00% 78.00% 77.00% 76.00% 0 0 0.5 1 1.5 2 0.01 0.02 0.03 0.04 0.05 Iout (A) Iout (A) Figure 1. Efficiency VIN = 12 V, VOUT = 3.3 V Figure 2. Efficiency VIN = 12 V, VOUT = 3.3 V Vin=6.5V Io=0.1A 3.39 3.
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TPS5402 www.ti.com SLVSBK4 – SEPTEMBER 2012 TYPICAL CHARACTERISTICS (continued) TA = 25°C, VIN = 12 V, VOUT = 3.3 V, fSW = 120 kHz (unless otherwise noted) Vin Vin Vout Vout LX LX IL IL Figure 7. Steady State IO = 100 mA Figure 8. Load Transient IO = 0.1 A to 2 A Vin Vout Vin Vout IL IL Figure 9. Short Circuit Protection Figure 10.
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TPS5402 SLVSBK4 – SEPTEMBER 2012 www.ti.com OVERVIEW The TPS5402 is a 28-V, 1.7-A, step-down (buck) converter with an integrated high-side N-channel MOSFET. To improve performance during line and load transients, the device implements a constant frequency, current mode control which reduces output capacitance and simplifies external frequency compensation design.
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TPS5402 www.ti.com SLVSBK4 – SEPTEMBER 2012 Pulse Skipping Mode The TPS5402 is designed to operate in pulse skipping mode at light load currents to boost light load efficiency. When the peak inductor current is lower than 300 mA typically, the COMP pin voltage falls to 0.5 V typically and the device enters pulse skipping mode. When the device is in pulse skipping mode, the COMP pin voltage is clamped at 0.5 V internally which prevents the high side integrated MOSFET from switching.
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TPS5402 SLVSBK4 – SEPTEMBER 2012 www.ti.com The TPS5402 provides robust protection during short circuits. There is potential for overcurrent runaway in the output inductor during a short circuit at the output. The TPS5402 solves this issue by increasing the off time during short circuit conditions by lowering the switching frequency. The switching frequency is divided by 8, 4, 2, and 1 as the voltage ramps from 0 V to 0.8 V on the VSENSE pin.
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TPS5402 www.ti.com L= SLVSBK4 – SEPTEMBER 2012 VIN - VOUT V × OUT IO × LIR VIN × fsw (3) V - VOUT V DiL = IN × OUT IO VIN × fsw (4) VOUT × (VINmax - VOUT ) 2 ) VINmax × L × fsw 2 = IO + 12 Di = IO + L 2 ( iLRMS ILpeak (5) (6) For this design example, use LIR = 0.3 and the inductor is calculated to be 5.40 µH with VIN = 12 V. Choose 4.7 µH value for the standard inductor and the peak to peak inductor ripple is about 34% of 1-A DC load current.
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TPS5402 SLVSBK4 – SEPTEMBER 2012 www.ti.com Thermal Shutdown The device implements an internal thermal shutdown to protect itself if the junction temperature exceeds 165°C. The thermal shutdown forces the device to stop switching when the junction temperature exceeds the thermal trip threshold. Once the die temperature decreases below 165°C, the device reinitiates the power up sequence.
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PACKAGE OPTION ADDENDUM www.ti.com 13-Dec-2012 PACKAGING INFORMATION Orderable Device Status (1) TPS5402DR ACTIVE Package Type Package Pins Package Qty Drawing SOIC D 8 2500 Eco Plan Lead/Ball Finish (2) Green (RoHS & no Sb/Br) CU NIPDAU MSL Peak Temp Samples (3) (Requires Login) Level-1-260C-UNLIM (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs.
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PACKAGE MATERIALS INFORMATION www.ti.com 12-Dec-2012 TAPE AND REEL INFORMATION *All dimensions are nominal Device TPS5402DR 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 12-Dec-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS5402DR SOIC D 8 2500 340.5 338.1 20.
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