Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Holder SO 8

Vout(50mV/div)

Iout(2 A/div)

100 s/divm

TPS54327

www.ti.com

SLVSAG1B –DECEMBER 2010–REVISED JUNE 2013

3-A OUTPUT SINGLE SYNCHRONOUS STEP DOWN SWITCHER

WITH INTEGRATED FET

Check for Samples: TPS54327

FEATURES

DESCRIPTION

The TPS54327 is an adaptive on-time D-CAP2™

• D-CAP2™ Mode Enables Fast Transient

mode synchronous buck converter. TheTPS54327

Response

enables system designers to complete the suite of

• Low Output Ripple and Allows Ceramic Output

various end equipment’s power bus regulators with a

Capacitor

cost effective, low component count, low standby

current solution. The main control loop for the

• Wide V

Input Voltage Range: 4.5 V to 18 V

TPS54327 uses the D-CAP2™ mode control which

• Output Voltage Range: 0.76 V to 7.0 V

provides a fast transient response with no external

• Highly Efficient Integrated FET’s Optimized

compensation components. The TPS54327 also has

for Lower Duty Cycle Applications

a proprietary circuit that enables the device to adopt

– 100 mΩ (High Side) and 70 mΩ (Low Side)

to both low equivalent series resistance (ESR) output

capacitors, such as POSCAP or SP-CAP, and ultra-

• High Efficiency, less than 10 μA at shutdown

low ESR ceramic capacitors. The device operates

• High Initial Bandgap Reference Accuracy

from 4.5-V to 18-V VIN input. The output voltage can

• Adjustable Soft Start

be programmed between 0.76 V and 7 V. The device

also features an adjustable soft start time. The

• Pre-Biased Soft Start

TPS54327 is available in the 8-pin DDA package and

• 700-kHz Switching Frequency (f

)

10-pin DRC, and is designed to operate from –40°C

• Cycle By Cycle Over Current Limit

to 85°C.

APPLICATIONS

• Wide Range of Applications for Low Voltage

System

– Digital TV Power Supply

– High Definition Blu-ray Disc™ Players

– Networking Home Terminal

– Digital Set Top Box (STB)

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.

2D-CAP2 is a trademark of Texas Instruments.

3Blu-ray Disc is a trademark of Blu-ray Disc Association.

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 (27 pages)

PAGE 1
TPS54327 www.ti.com SLVSAG1B – DECEMBER 2010 – REVISED JUNE 2013 3-A OUTPUT SINGLE SYNCHRONOUS STEP DOWN SWITCHER WITH INTEGRATED FET Check for Samples: TPS54327 FEATURES DESCRIPTION • The TPS54327 is an adaptive on-time D-CAP2™ mode synchronous buck converter. TheTPS54327 enables system designers to complete the suite of various end equipment’s power bus regulators with a cost effective, low component count, low standby current solution.
PAGE 2
TPS54327 SLVSAG1B – DECEMBER 2010 – REVISED JUNE 2013 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.
PAGE 3
TPS54327 www.ti.com SLVSAG1B – DECEMBER 2010 – REVISED JUNE 2013 RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) VIN Supply input voltage range VI Input voltage range MIN MAX 4.5 18 VBST –0.1 24 VBST (10 ns transient) -.0.1 27 VBST(vs SW) –0.1 6 SS –0.1 5.7 EN –0.1 18 VFB –0.1 5.5 SW –1.8 18 SW (10 ns transient) UNIT V V –3 21 GND –0.1 0.1 –0.1 5.
PAGE 4
TPS54327 SLVSAG1B – DECEMBER 2010 – REVISED JUNE 2013 www.ti.com ELECTRICAL CHARACTERISTICS (continued) over operating free-air temperature range VIN = 12 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT THERMAL SHUTDOWN TSDN Thermal shutdown threshold Shutdown temperature Hysteresis (2) 165 (2) °C 30 ON-TIME TIMER CONTROL tON On time VIN = 12 V, VO = 1.05 V 150 tOFF(MIN) Minimum off time TA = 25°C, VFB = 0.7 V 260 310 ns 2.
PAGE 5
TPS54327 www.ti.com SLVSAG1B – DECEMBER 2010 – REVISED JUNE 2013 DEVICE INFORMATION DDA PACKAGE (TOP VIEW) DRC PACKAGE (TOP VIEW) 10 VIN EN 1 1 VIN EN 8 VFB 2 2 TPS54327 (DDA) VFB 3 VREG5 4 SS Exposed Thermal Pad VREG5 3 VBST 7 SS 4 SW 6 GND 5 Exposed Thermal Die PAD on Underside PGND GND 5 9 VIN 8 VBST 7 SW 6 SW PIN FUNCTIONS PIN NAME DESCRIPTION DDA DRC EN 1 1 Enable input control. Active high. VFB 2 2 Converter feedback input.
PAGE 6
TPS54327 SLVSAG1B – DECEMBER 2010 – REVISED JUNE 2013 www.ti.
PAGE 7
TPS54327 www.ti.com SLVSAG1B – DECEMBER 2010 – REVISED JUNE 2013 OVERVIEW The TPS54327 is a 3-A synchronous step-down (buck) converter with two integrated N-channel MOSFETs. It operates using D-CAP2™ mode control. The fast transient response of D-CAP2™ control reduces the output capacitance required to meet a specific level of performance. Proprietary internal circuitry allows the use of low ESR output capacitors including ceramic and special polymer types.
PAGE 8
TPS54327 SLVSAG1B – DECEMBER 2010 – REVISED JUNE 2013 www.ti.com cycle begins. In subsequent switching cycles, the on-time is set to a fixed value and the current is monitored in the same manner. If the over current condition exists for 7 consecutive switching cycles, the internal OCL threshold is set to a lower level, reducing the available output current.
PAGE 9
TPS54327 www.ti.com SLVSAG1B – DECEMBER 2010 – REVISED JUNE 2013 TYPICAL CHARACTERISTICS VIN = 12 V, TA = 25°C (unless otherwise noted) spacer 1200 10.0 8.0 IVINSDN - Supply Current - µA IVIN - Supply Current - µA 1000 800 600 400 6.0 4.0 2.0 200 0 -50 0 50 100 Tj - Junction Temperature - °C 0 -50 150 Figure 1. VIN CURRENT vs JUNCTION TEMPERATURE 0 50 100 Tj - Junction Temperature - °C 150 Figure 2. VIN SHUTDOWN CURRENT vs JUNCTION TEMPERATURE 100 1.
PAGE 10
TPS54327 SLVSAG1B – DECEMBER 2010 – REVISED JUNE 2013 www.ti.com TYPICAL CHARACTERISTICS (continued) VIN = 12 V, TA = 25°C (unless otherwise noted) spacer 100 90 Efficiency - % EN (10 V/div) VREG5 (5 V/div) VOUT = 3.3 V 80 VOUT = 2.5 V VOUT = 1.8 V 70 60 Vout (0.5 V/div) 50 1 ms/div) 40 0.0 Figure 7. START-UP WAVE FORM 1.0 1.5 2.0 IOUT - Output Current - A 2.5 3.0 Figure 8.
PAGE 11
TPS54327 www.ti.com SLVSAG1B – DECEMBER 2010 – REVISED JUNE 2013 DESIGN GUIDE Step By Step Design Procedure To • • • • • begin the design process, you must know a few application parameters: Input voltage range Output voltage Output current Output voltage ripple Input voltage ripple Figure 13. Shows the schematic diagram for this design example. Output Voltage Resistors Selection The output voltage is set with a resistor divider from the output node to the VFB pin.
PAGE 12
TPS54327 SLVSAG1B – DECEMBER 2010 – REVISED JUNE 2013 www.ti.com Table 1. Recommended Component Values Output Voltage (V) R1 (kΩ) R2 (kΩ) L1 (µH) C8 + C9 (µF) 1 6.81 22.1 C4 (pF) 1.5 22 - 68 1.05 8.25 22.1 1.5 22 - 68 1.2 12.7 22.1 1.5 22 - 68 1.8 30.1 22.1 5 - 22 2.2 22 - 68 2.5 49.9 22.1 5 - 22 2.2 22 - 68 3.3 73.2 22.1 5 - 22 2.2 22 - 68 5 124 22.1 5 - 22 3.3 22 - 68 6.5 165 22.1 5 - 22 3.
PAGE 13
TPS54327 www.ti.com SLVSAG1B – DECEMBER 2010 – REVISED JUNE 2013 THERMAL INFORMATION This 8-pin DDA package incorporates an exposed thermal pad that is designed to be directly to an external heartsick. The thermal pad must be soldered directly to the printed board (PCB). After soldering, the PCB can be used as a heartsick.
PAGE 14
TPS54327 SLVSAG1B – DECEMBER 2010 – REVISED JUNE 2013 www.ti.com LAYOUT CONSIDERATIONS 1. Keep the input switching current loop as small as possible. 2. Keep the SW node as physically small and short as possible to minimize parasitic capacitance and inductance and to minimize radiated emissions. Kelvin connections should be brought from the output to the feedback pin of the device. 3. Keep analog and non-switching components away from switching components. 4.
PAGE 15
TPS54327 www.ti.com SLVSAG1B – DECEMBER 2010 – REVISED JUNE 2013 VIN FEEDBACK RESISTORS TO ENABLE CONTROL EN VIN HIGH FREQENCY BYPASS VIN CAPACITOR VFB VIN VREG5 BIAS CAP SLOW START CAP ANALOG GROUND TRACE VIN INPUT BYPASS CAPACITOR VBST SS SW GND SW BOOST CAPACITOR OUTPUT INDUCTOR EXPOSED THERMAL PAD AREA Connection to POWER GROUND on internal or bottom layer VOUT OUTPUT FILTER CAPACITOR POWER GROUND VIA to Ground Plane Figure 16.
PAGE 16
TPS54327 SLVSAG1B – DECEMBER 2010 – REVISED JUNE 2013 www.ti.com REVISION HISTORY Changes from Original (November 2010) to Revision A Page • Changed the VENH Min value From: 2 V To: 1.6 V in the Logic Threshold section .............................................................. 3 • Changed Pin 6 (SW) Description In the Pin Functions table ................................................................................................ 5 • Changed Equation 1 .......................................
PAGE 17
PACKAGE OPTION ADDENDUM www.ti.
PAGE 18
PACKAGE OPTION ADDENDUM www.ti.com 16-Jul-2013 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
PAGE 19
PACKAGE MATERIALS INFORMATION www.ti.com 16-Jul-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TPS54327DDAR SO Power PAD DDA 8 2500 330.0 12.8 6.4 5.2 2.1 8.0 12.0 Q1 TPS54327DRCR SON DRC 10 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS54327DRCT SON DRC 10 250 180.0 12.4 3.3 3.3 1.1 8.0 12.
PAGE 20
PACKAGE MATERIALS INFORMATION www.ti.com 16-Jul-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS54327DDAR SO PowerPAD DDA 8 2500 366.0 364.0 50.0 TPS54327DRCR SON DRC 10 3000 367.0 367.0 35.0 TPS54327DRCT SON DRC 10 250 210.0 185.0 35.
PAGE 21
PAGE 22
PAGE 23
PAGE 24
PAGE 25
PAGE 26
PAGE 27
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.