Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - linear/switching voltage regulator Arbitrary function VQFN 24 (4x4)

VO1

PGOOD

VBST1

DRVH1

VO2

VREG3

VBST2

DRVH2

TPS51123RGE

(QFN-24)

LL1

DRVL1

LL2

DRVL2

13 14 15 16 17 18

EN0

SKIPSEL

GND

VIN

VREG5

ENC

6 5 4 3 2 1

TRIP2

VFB2

TONSEL

VREF

VFB1

TRIP1

PowerPAD

220 nF

20 kW 20 kW 30 kW

100 kW

VREG5

33 mF

5.1 W

0.1 mF

130 kW130 kW

3.3 mF

330 mF

VO1

5 V

VIN

VREG5

ENC

VIN

10 mF x 2

VIN

5.5 V

28 V

EN0

5.1 W

0.1 mF

3.3 mF

330 mF

VO2

3.3 V

10 mF x 2

10 mF

13 kW

UDG-08167

VIN

TPS51123

www.ti.com

SLUS890E –DECEMBER 2008–REVISED JANUARY 2013

Dual-Synchronous, Step-Down Controller with Out-of-Audio™ Operation and 100-mA

LDOs for Notebook System Power

Check for Samples: TPS51123

FEATURES

APPLICATIONS

• Wide-Input Voltage Range: 5.5 V to 28 V

• Notebook Computers

• Output Voltage Range: 2 V to 5.5 V • I/O Supplies

• Built-in 100-mA 5-V/3.3-V LDO with Switches • System Power Supplies

• Built-in 1% 2-V Reference Output

DESCRIPTION

• With/Without Out-of-Audio™ Mode Selectable

The TPS51123 is a cost effective, dual-synchronous

Light-Load and PWM only Operation

buck controller targeted for notebook system power

• Internal 1.6-ms Voltage Servo Softstart

supply solutions. It provides 5-V and 3.3-V LDOs and

• Adaptive On-Time Control Architecture with

requires few external components. The TPS51123

supports high efficiency, fast transient responses and

Four Selectable Frequency Setting

provides a combined power-good signal. Out-of-

• 4500 ppm/°C R

DS(on)

Current Sensing

Audio™ mode light-load operation enables low

• Built-In Output Discharge

acoustic noise at much higher efficiency than

• Power Good Output

conventional forced PWM operation. Adaptive on-

time D-CAP™ control provides convenient and

• Built-in OVP/UVP/OCP

efficient operation. The part operates with supply

• Thermal Shutdown (Non-latch)

input voltages ranging from 5.5 V to 28 V and

• 24-Pin QFN (RGE) Package

supports output voltages from 2 V to 5.5 V. The

TPS51123 is available in a 24-pin QFN package and

is specified from -40°C to 85°C ambient temperature

range.

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.

2Out-of-Audio, D-CAP 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 (37 pages)

PAGE 1
TPS51123 www.ti.com SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 Dual-Synchronous, Step-Down Controller with Out-of-Audio™ Operation and 100-mA LDOs for Notebook System Power Check for Samples: TPS51123 FEATURES APPLICATIONS • • • • • • • • 1 2 • • • • • • • • Wide-Input Voltage Range: 5.5 V to 28 V Output Voltage Range: 2 V to 5.5 V Built-in 100-mA 5-V/3.
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TPS51123 SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 www.ti.com ORDERING INFORMATION (1) ORDERABLE DEVICES TA PACKAGE -40°C to 85°C Plastic Quad Flat Pack (QFN) (1) PINS TRANSPORT MEDIA 24 Tape/Reel TPS51123RGET TPS51123RGER MINIMUM QUANTITY 250 3000 ECO PLAN Green (RoHS and no Sb/Br) For the most current spcifications and package information, see the Package Option Addendum located at the end of this data sheet or refer to our web site at http://www.ti.com.
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TPS51123 www.ti.com SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) PARAMETER Supply voltage Input voltage range Output voltage range TA VIN MIN 5.5 TYP MAX 28 VBST1, VBST2 -0.1 34 VBST1, VBST2 (wrt LLx) -0.1 5.5 EN0, ENC, TRIP1, TRIP2, VFB1, VFB2, VO1, VO2, TONSEL, SKIPSEL -0.1 5.5 DRVH1, DRVH2 -0.8 34 DRVH1, DRVH2 (wrt LLx) -0.1 5.5 LL1, LL2 -1.8 28 VREF, VREG3, VREG5 -0.1 5.
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TPS51123 SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 www.ti.com ELECTRICAL CHARACTERISTICS over operating free-air temperature range, VIN = 12 V (unless otherwise noted) PARAMETER CONDITIONS MIN TYP MAX UNIT SUPPLY CURRENT IVIN1 VIN supply current1 VIN current, T A = 25°C, no load, VO1 = 0 V, VO2 = 0 V, EN0=open, ENC = 5 V, TRIP1 = TRIP2 = 2 V, VFB1 = VFB2 = 2.05 V 0.55 1 mA IVIN2 VIN supply current2 VIN current, TA = 25°C, no load, VO1 = 5 V, VO2 = 3.
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TPS51123 www.ti.com SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 ELECTRICAL CHARACTERISTICS (continued) over operating free-air temperature range, VIN = 12 V (unless otherwise noted) PARAMETER CONDITIONS MIN TYP MAX UNIT OUTPUT DRIVERS RDRVH RDRVL tDEAD DRVH resistance DRVL resistance Dead time Source, VBSTx - DRVHx = 100 mV 4 8 1.5 4 4 8 Sink, VDRVLx = 100 mV 1.
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TPS51123 SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 www.ti.
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TPS51123 www.ti.com SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 DEVICE INFORMATION Table 1. TERMINAL FUNCTIONS TABLE TERMINAL NAME NO. DRVH1 21 DRVH2 10 DRVL1 19 DRVL2 12 EN0 I/O DESCRIPTION O High-side N-channel MOSFET driver outputs. LL referenced drivers. O Low-side N-channel MOSFET driver outputs. GND referenced drivers. 13 I/O Master enable input. Open : LDOs on, and ready to turn both switcher channels.
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TPS51123 SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 www.ti.
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TPS51123 www.ti.
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TPS51123 SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 www.ti.com TYPICAL CHARACTERISTICS VIN SUPPLY CURRENT1 vs JUNCTION TEMPERATURE VIN SUPPLY CURRENT1 vs INPUT VOLTAGE 800 800 IVIN1 - VIN Supply Current1 - mA IVIN1 - VIN Supply Current1 - mA 700 700 600 500 400 300 200 100 600 500 400 300 200 100 0 -50 0 50 100 0 150 5 TJ - Junction Temperature - °C 10 15 20 25 V IN - Input Voltage - V Figure 1. Figure 2.
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TPS51123 www.ti.com SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 TYPICAL CHARACTERISTICS (continued) VIN STANDBY CURRENT vs INPUT VOLTAGE VIN STANDBY CURRENT vs JUNCTION TEMPERATURE 250 IVINSTBY - VIN Standby Current - nA IVINSTBY - VIN Standby Current - mA 250 200 150 100 50 0 200 150 100 50 0 50 0 50 100 5 150 10 TJ - Junction Temperature - °C Figure 5. 20 25 Figure 6.
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TPS51123 SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 www.ti.com TYPICAL CHARACTERISTICS (continued) SWITCHING FREQUENCY vs INPUT VOLTAGE CURRENT SENSE CURRENT vs JUNCTION TEMPERATURE 500 TONSEL = GND 13 fSW - Swithching Frequency - kHz ITRIP - Current Sense Current - mA 14 12 11 10 9 8 400 300 CH2 200 CH1 100 7 6 0 50 0 50 100 6 150 8 10 12 14 Figure 9. 20 22 24 26 Figure 10. SWITCHING FREQUENCY vs INPUT VOLTAGE SWITCHING FREQUENCY vs INPUT VOLTAGE 500 500 TONSEL = 3.
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TPS51123 www.ti.com SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 TYPICAL CHARACTERISTICS (continued) SWITCHING FREQUENCY vs OUTPUT CURRENT SWITCHING FREQUENCY vs INPUT VOLTAGE 500 500 TONSEL = 5V 400 f SW - Swithching Frequency - kHz f SW - Swithching Frequency - kHz TONSEL = GND CH2 CH1 300 200 100 400 300 CH2 PWM Only 200 CH1 PWM Only 100 CH2 Auto-skip CH2 OOA CH1 OOA CH1 Auto-skip 0 0.001 0 6 8 10 12 14 16 18 20 22 24 26 0.01 0.1 Figure 13.
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TPS51123 SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 www.ti.com TYPICAL CHARACTERISTICS (continued) SWITCHING FREQUENCY vs OUTPUT CURRENT OVP/UVP THRESHOLD VOLTAGE vs JUNCTION TEMPERATURE 500 150 TONSEL = 5V 400 V OVP/VUVP - OVP/UVP Threshold - % f SW - Swithching Frequency - kHz 140 CH2 PWM Only CH1 PWM Only 300 200 CH2 Auto-skip CH2 OOA 100 CH1 OOA CH1 Auto-skip 0 0.001 130 120 110 100 90 80 70 60 50 40 0.01 0.
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TPS51123 www.ti.com SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 TYPICAL CHARACTERISTICS (continued) VREF OUTPUT VOLTAGE vs OUTPUT CURRENT 5-V OUTPUT VOLTAGE vs OUTPUT CURRENT 5.075 2.020 OOA V OUT1 - 5-V Output Voltage - V V VREF - VREF Output Voltage - V 2.015 2.010 2.005 2.000 1.995 1.990 5.050 5.025 5.000 Auto-skip PWM Only 4.975 1.985 4.950 0.001 1.980 0 20 40 60 80 0.01 100 0.1 1 10 IOUT1 - 5-V Output Current - A IVREF - VREF Output Current - mA Figure 21. Figure 22. 3.
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TPS51123 SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 www.ti.com TYPICAL CHARACTERISTICS (continued) 5-V EFFICIENCY vs OUTPUT CURRENT 3.3-V OUTPUT VOLTAGE vs INPUT VOLTAGE 100 Auto-Skip 80 3.330 h – Efficiency – % V OUT2 - 3.3-V Output Voltage - V 3.360 IO = 0A 3.300 IO = 6A VIN = 20 V 60 VIN = 12 V 40 3.270 VIN = 8 V 20 OOA PWM Only 3.240 6 8 10 12 14 16 18 20 22 24 0 0.001 26 0.01 V IN - Input Voltage - V 0.1 1 10 IOUT1 – 5-V Output Current – A Figure 25. Figure 26.
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TPS51123 www.ti.com SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 TYPICAL CHARACTERISTICS (continued) 5-V Load Transient Response 3.3-V Load Transient Response VOUT2 (100mV/div) VOUT1 (100mV/div) IIND (5A/div) IIND (5A/div) IOUT2 (5A/div) IOUT1 (5A/div) Figure 28. Figure 29. 5-V Startup Waveforms 3.3-V Startup Waveforms ENC (5 V/div) ENC (5 V/div) VOUT1 (2 V/div) VOUT2 (2 V/div) PGOOD (5 V/div) PGOOD (5 V/div) Figure 30. Figure 31.
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TPS51123 SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 www.ti.com TYPICAL CHARACTERISTICS (continued) 5-V Switchover Waveforms 3.3-V Switchover Waveforms VREG5 (200mV/div) VREG3 (200mV/div) VOUT2 (200mV/div) VOUT1 (200mV/div) Figure 32. Figure 33. 5-V Soft-stop Waveforms 3.3-V Soft-stop Waveforms ENC (10 V/div) ENC (10 V/div) VOUT1 (2 V/div) VOUT2 (2 V/div) PGOOD (5 V/div) PGOOD (5 V/div) DRVL1 (5 V/div) DRVL2 (5 V/div) Figure 34. 18 Figure 35.
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TPS51123 www.ti.com SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 APPLICATION INFORMATION PWM Operations The main control loop of the switch mode power supply (SMPS) is designed as an adaptive on-time pulse width modulation (PWM) controller. It supports a proprietary D-CAP™ mode. D-CAP™ mode does not require external compensation circuit and is suitable for low external component count configuration when used with appropriate amount of ESR at the output capacitor(s).
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TPS51123 SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 www.ti.com Loop Compensation From small-signal loop analysis, a buck converter using D-CAPTM mode can be simplified as below. VIN R1 DRVH PWM VFB + + R2 Control logic & Driver Lx Ic IL DRVL Io 2V ESR Vc Voltage Divider RL Switching Modulator Co Output Capacitor Figure 36. Simplifying the Modulator The output voltage is compared with internal reference voltage after divider resistors, R1 and R2.
PAGE 21
TPS51123 www.ti.com SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 Light Load Condition in Auto-Skip Operation The TPS51123 automatically reduces switching frequency at light load conditions to maintain high efficiency. This reduction of frequency is achieved smoothly and without increase of VOUT ripple. Detail operation is described as follows.
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TPS51123 SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 www.ti.com VREG5 Switch Over When the VO1 voltage becomes higher than 4.7 V AND channel-1 internal powergood flag is generated, internal 5-V LDO regulator is shut off and the VREG5 output is connected to VO1 by internal switch over MOSFET. The 510-μs powergood delay helps a switch over without glitch. VREG3 Switch Over When the VO2 voltage becomes higher than 3.15 V AND channel-2 internal powergood flag is generated, internal 3.
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TPS51123 www.ti.com SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 Current Protection TPS51123 has cycle-by-cycle over current limiting control. The inductor current is monitored during the ‘OFF’ state and the controller keeps the ‘OFF’ state during the inductor current is larger than the over current trip level. In order to provide both good accuracy and cost effective solution, TPS51123 supports temperature compensated MOSFET RDS(on) sensing.
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TPS51123 SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 www.ti.com UVLO Protection TPS51123 has VREG5 under voltage lock out protection (UVLO). When the VREG5 voltage is lower than UVLO threshold voltage both switch mode power supplies are shut off. This is non-latch protection. When the VREG3 voltage is lower than (VO2 - 1 V), both switch mode power supplies are also shut off Thermal Shutdown TPS51123 monitors the temperature of itself.
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TPS51123 www.ti.com SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 Layout Considerations Certain points must be considered before starting a layout work using the TPS51123. • TPS51123 has only one GND pin and special care of GND trace design makes operation stable, especially when both channels operate.
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TPS51123 SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 www.ti.com SGND VIN VIN 220 nF VOUT2 5 3 2 VFB2 VREF VFB1 DRVL2 VOUT1 DRVL1 5 19 TPS51123 VREG5 PowerPAD GND VREG3 PGND PGND 17 15 33 mF 8 10 mF SGND UDG-08166 Figure 37.
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TPS51123 www.ti.com SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 * CH1 Vout divider Driver and switch node traces are shown for CH1 only.
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TPS51123 SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 www.ti.com Application Circuit SGND R1 13kW R2 20kW C6 0.22mF R5 130kW 3.3V/100mA R4 30kW R3 20kW R6 130kW SGND SGND PGND 2 1 VF B1 TR IP1 VIN VIN 5.5 ~ 28V VO1 24 8 VREG3 PGOOD 23 9 VBST2 VBST1 22 DRVH1 21 LL1 20 VREG5 PGND PGND L1 3.3mH Q1 IRF7821 C4 0.1mF C9 10mF C8 10 mF R8 100kW R7 5.1W R9 5.1W TPS51123RGE (QFN24) 10 DRVH2 VO2 3.3V/8A 11 LL2 PowerPAD C7 0.
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TPS51123 www.ti.com SLUS890E – DECEMBER 2008 – REVISED JANUARY 2013 REVISION HISTORY Changes from Revision B (March 2010) to Revision C • Page Added LL1, LL2, pulse width < 20 ns parameter with a value of -5.0 V to 30 V. ................................................................. 2 Changes from Revision C (March 2012) to Revision D Page • Added ESD ratings to the ABSOLUTE MAXIMUM RATINGS table ....................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 18-Oct-2013 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
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PACKAGE MATERIALS INFORMATION www.ti.com 26-Jan-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 TPS51123RGER VQFN RGE 24 3000 330.0 12.4 4.25 4.25 1.15 8.0 12.0 Q2 TPS51123RGER VQFN RGE 24 3000 330.0 12.4 4.25 4.25 1.15 8.0 12.0 Q2 TPS51123RGET VQFN RGE 24 250 180.0 12.4 4.25 4.25 1.15 8.0 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) TPS51123RGER VQFN RGE 24 3000 367.0 367.0 35.0 TPS51123RGER VQFN RGE 24 3000 367.0 367.0 35.0 TPS51123RGET VQFN RGE 24 250 210.0 185.0 35.0 TPS51123RGET VQFN RGE 24 250 210.0 185.0 35.
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