Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Boost, Flyback, SEPIC HTSSOP 14

OUT

TPS61

175

VIN

PGND

AGND

Syn

FREQ

COMP

PGND

TPS61175

www.ti.com

SLVS892B –DECEMBER 2008–REVISED FEBRUARY 2012

3-A High Voltage Boost Converter with Soft-start and Programmable Switching Frequency

Check for Samples: TPS61175

FEATURES DESCRIPTION

The TPS61175 is a monolithic switching regulator

• 2.9-V to 18-V Input Voltage Range

with integrated 3-A, 40-V power switch. It can be

• 3A, 40V Internal Switch

configured in several standard switching-regulator

• High Efficiency Power Conversion: Up to 93%

topologies, including boost, SEPIC and flyback. The

device has a wide input voltage range to support

• Frequency Set by External Resistor: 200-kHz

application with input voltage from multi-cell batteries

to 2.2-MHz

or regulated 5-V, 12-V power rails.

• Synchronous External Switching Frequency

The TPS61175 regulates the output voltage with

• User Defined Soft Start into Full Load

current mode PWM (pulse width modulation) control.

• Skip-Switching Cycle for Output Regulation at

The switching frequency of PWM is either set by an

Light Load

external resistor or an external clock signal. The user

can program the switching frequency from 200-kHz to

• 14-pin HTSSOP Package with PowerPad™

2.2-MHz.

APPLICATIONS

The device features a programmable soft-start

function to limit inrush current during start-up, and

• 5V to 12V, 24V power conversion

has built-in other protection features, such as pulse-

• Supports SEPIC, Flyback topology

by-pulse over current limit and thermal shutdown. The

• ADSL Modems

TPS61175 is available in 14-pin HTSSOP package

with Powerpad.

• TV Tuner

TYPICAL APPLICATION FOR BOOST CONVERTER

Figure 1. Typical Application

ORDERING INFORMATION

(1)

PART NUMBER PACKAGE

(2)

–40°C to 85°C TPS61175PWP HTSSOP-14

(1) For the most current package and ordering information, see the TI Web site at www.ti.com.

(2) The PWP package is available in tape and reel. Add R suffix (TPS61175PWPR) to order quantities of 2000 parts per reel. Without suffix,

the TPS61175PWP is shipped in tubes with 90 parts per tube.

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.

2PowerPad 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 (29 pages)

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TPS61175 www.ti.com SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 3-A High Voltage Boost Converter with Soft-start and Programmable Switching Frequency Check for Samples: TPS61175 FEATURES DESCRIPTION • • • • The TPS61175 is a monolithic switching regulator with integrated 3-A, 40-V power switch. It can be configured in several standard switching-regulator topologies, including boost, SEPIC and flyback.
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TPS61175 SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 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. ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) Supply Voltages on pin VIN (2) VALUE UNIT –0.3 to 20 V Voltages on pins EN (2) –0.
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TPS61175 www.ti.com SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 ELECTRICAL CHARACTERISTICS FSW = 1.2 MHz (Rfreq=80 kΩ), Vin=3.6V, TA = –40°C to +85°C, typical values are at TA = 25°C (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SUPPLY CURRENT VIN Input voltage range 18 V IQ Operating quiescent current into Vin Device PWM switching without load 2.9 3.5 mA ISD Shutdown current EN=GND 1.5 μA VUVLO Under-voltage lockout threshold 2.
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TPS61175 SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 www.ti.com DEVICE INFORMATION PIN ASSIGNMENTS TSSOP 14-pin (TOP VIEW) SW SW VIN EN SS SYNC AGND 1 2 3 4 5 6 7 PGND PGND PGND NC FREQ FB COMP 14 13 12 11 10 9 8 PIN FUNCTIONS PIN NAME NO. DESCRIPTION I/O VIN 3 I The input supply pin for the IC. Connect VIN to a supply voltage between 2.9V and 18V.
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TPS61175 www.ti.com SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 FUNCTIONAL BLOCK DIAGRAM L1 D1 C1 C2 R1 FB SW VIN R2 FB EA EN Gate Driver 1.
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TPS61175 SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 www.ti.com EFFICIENCY vs OUTPUT CURRENT EFFICIENCY vs OUTPUT CURRENT 100 100 VI = 5 V VO = 12 V 90 VI = 12 V 90 VI = 5 V Efficiency - % Efficiency - % VO = 24 V 80 VO = 35 V 70 80 70 60 60 50 50 VO = 24 V 0.2 0.4 0.6 0.8 IO - Output Current - A 1 0 1.2 ERROR AMPLIFIER TRANSCONDUCTANCE vs FREE-AIR TEMPERATURE OVERCURRENT LIMIT vs DUTY CYCLE 5 380 4.5 360 1 1.2 4 3.
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TPS61175 www.ti.com SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 OVERCURRENT LIMIT vs FREE-AIR TEMPERATURE FB VOLTAGE vs FREE-AIR TEMPERATURE 4 1240 3.9 FB Voltage - mV Overcurrent Limit - A 1235 3.8 3.7 1230 1225 3.6 3.5 -40 -20 0 80 60 20 40 TA - Free-Air Temperature - °C 100 120 1220 -40 -20 0 20 40 60 80 TA - Free-Air Temperature - °C Figure 6. Figure 7.
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TPS61175 SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 www.ti.com Soft Startup EN 2 V/div VOUT 5 V/div IL 500 mA/div t - 1 ms/div Figure 12. DETAILED DESCRIPTION OPERATION The TPS61175 integrates a 40-V low side switch FET for up to 38-V output. The device regulates the output with current mode PWM (pulse width modulation) control. The PWM control circuitry turns on the switch at the beginning of each switching cycle.
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TPS61175 www.ti.com SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 3500 3000 f - Frequency - kHz 2500 2000 1500 1000 500 0 10 100 External Resistor - kW 1000 Figure 13. Switching Frequency vs External Resistor Alternatively, the TPS61175 switching frequency will synchronize to an external clock signal that is applied to the SYNC pin. The logic level of the external clock is shown in the specification table. The duty cycle of the clock is recommended in the range of 10% to 90%.
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TPS61175 SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 www.ti.com ENABLE AND THERMAL SHUTDOWN The TPS61175 enters shutdown when the EN voltage is less than 0.4-V for more than 10-ms. In shutdown, the input supply current for the device is less than 1.5-μA (max). The EN pin has an internal 800-kΩ pull down resistor to disable the device when it is floating. An internal thermal shutdown turns off the device when the typical junction temperature of 160°C is exceeded.
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TPS61175 www.ti.com SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 APPLICATION INFORMATION The following section provides a step-by-step design approach for configuring the TPS61175 as a voltage regulating boost converter, as shown in Figure 14. When configured as SEPIC or flyback converter, a different design approach is required. VIN D1 L1 VOUT C2 C1 TPS61175 VIN SW EN SW FREQ SS FB PGND COMP PGND R4 C3 R3 Syn AGND R1 R2 PGND NC C4 Figure 14.
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TPS61175 SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 www.ti.com Unless otherwise stated, the design equations that follow assume that the converter is running in continuous mode. SELECTING THE INDUCTOR The selection of the inductor affects steady state operation as well as transient behavior and loop stability. These factors make it the most important component in power regulator design. There are three important inductor specifications, inductor value, DC resistance and saturation current.
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TPS61175 www.ti.com SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 IOUT(max) = VIN(min) ´ ηest VOUT = VIN(min) ´ ILIM ´ (1 - %RPL/2) ´ ηest VOUT (6) where ILIM = over current limit ηest= efficiency estimate based on similar applications or computed above For instance, when VIN = 12-V is boosted to VOUT = 24-V, the inductor is 10-uH, the Schottky forward voltage is 0.4-V and the switching frequency is 1.2-MHz; then the maximum output current is 1.
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TPS61175 SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 www.ti.com Due to its low ESR, Vripple_ESR can be neglected for ceramic capacitors, but must be considered if tantalum or electrolytic capacitors are used.
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TPS61175 www.ti.com SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 æ öæ s s ç1 + ÷ ç1 2 ´ p ´ ¦ESR ø è 2 ´ p ´ ¦RHPZ ROUT ´ (1 - D) è ´ GPS (s) = s 2 ´ RSENSE 1+ 2 ´ p ´ ¦P ö ÷ ø ´ He(s) (10) Where ¦P = 2 2 p ´ RO ´ C2 ¦ESR » ¦RHPZ = RO (11) 1 2p ´ RESR ´ C2 (12) 2 æ V ö ´ ç IN ÷ 2p ´ L è VOUT ø (13) And He(s) = 1 éæ ù Se ö s ´ êç1 + ÷ ´ (1 - D) - 0.
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TPS61175 SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 www.ti.com 180 120 Gain 0 Phase – ° Gain − dB 60 –60 Phase –120 –180 fP f − Frequency − kHz Figure 16. Bode Plot of Power Stage Gain and Phase The TPS61175 COMP pin is the output of the internal trans-conductance amplifier. Equation 17 shows the equation for feedback resistor network and the error amplifier.
PAGE 17
TPS61175 www.ti.com SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 180 90 Phase – ° Gain − dB Phase 0 Kcomp –90 Gain –180 <–fp1 fC fZ f − Frequency − kHz fp2 Figure 17. Bode Plot of Feedback Resistors and Compensated Amplifier Gain and Phase The next step is to choose the loop crossover frequency, fC. The higher in frequency that the loop gain stays above zero before crossing over, the faster the loop response will be and therefore the lower the output voltage will droop during a step load.
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TPS61175 SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 www.ti.com VIN INPUT CAPACITOR VOUT INDUCTOR SCHOTTKEY OUTPUT CAPACITOR SW Minimize the area of SW trace SW PGND SW PGND VIN PGND PGND SS Thermal Pad EN NC FREQ SYNC FB AGND COMP Place enough VIAs around thermal pad to enhance thermal performance AGND FEEDBACK COMPESNATION NETWORK Figure 18.
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TPS61175 www.ti.com SLVS892B – DECEMBER 2008 – REVISED FEBRUARY 2012 REVISION HISTORY Changes from Original (December 2008) to Revision A • Page Changed the Ordering Information table - Part Number From: TPS61175 To: TPS61175PWP; Removed the Package Marking column .....................................................................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 19-Feb-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device TPS61175PWPR Package Package Pins Type Drawing SPQ HTSSOP 2000 PWP 14 Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 330.0 12.4 Pack Materials-Page 1 6.9 B0 (mm) K0 (mm) P1 (mm) 5.6 1.6 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 19-Feb-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS61175PWPR HTSSOP PWP 14 2000 367.0 367.0 35.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device TPS61175PWPR Package Package Pins Type Drawing SPQ HTSSOP 2000 PWP 14 Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 330.0 12.4 Pack Materials-Page 1 6.9 B0 (mm) K0 (mm) P1 (mm) 5.6 1.6 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Apr-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS61175PWPR HTSSOP PWP 14 2000 367.0 367.0 35.
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