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TPS51123A

www.ti.com

SLUSAA6C –APRIL 2011–REVISED SEPTEMBER 2012

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

LDOs for Notebook System Power

Check for Samples: TPS51123A

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 TPS51123A 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 Soft-Start

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

• Adaptive On-Time Control Architecture with

requires few external components. The TPS51123A

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

TPS51123A is available in a 24-pin QFN package

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

temperature range.

Table 1. Differences Between the TPS51123 and TPS51123A

TPS51123 TPS51123A

VREG5: at least 33 µF VREG5: 10 µF or larger (X5R or X7R)

VREG3: at most 10 µF VREG3: 10 µF or larger (X5R or X7R)

LDO Output Capacitance Requirement

(1 µF acceptable at no load) (1 µF acceptable at no load)

VREF: 0.22 µF to 1 µF VREF: 0.22 µF to 1 µF (X5R or X7R)

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 (38 pages)

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TPS51123A www.ti.com SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 Dual-Synchronous, Step-Down Controller with Out-of-Audio™ Operation and 100-mA LDOs for Notebook System Power Check for Samples: TPS51123A 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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TPS51123A SLUSAA6C – APRIL 2011 – REVISED 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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TPS51123A www.ti.com SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 ORDERING INFORMATION (1) (1) ORDERABLE DEVICE TA PACKAGE -40°C to 85°C Plastic Quad Flat Pack (QFN) TPS51123ARGER TPS51123ARGET OUTPUT SUPPLY MINIMUM QUANTITY Tape/Reel 3000 Small Tape/Reel 250 PINS 24 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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TPS51123A SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 www.ti.com RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) PARAMETER Supply voltage Input voltage range Output voltage range TA 4 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.
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TPS51123A www.ti.com SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 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 1.00 mA IVIN2 VIN supply current2 VIN current, TA = 25°C, no load, VO1 = 5 V, VO2 = 3.
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TPS51123A SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 www.ti.com ELECTRICAL CHARACTERISTICS (continued) over operating free-air temperature range, VIN = 12 V (unless otherwise noted) PARAMETER CONDITIONS MIN TYP MAX UNIT OUTPUT DRIVERS RDRVH DRVH resistance RDRVL DRVL resistance tDEAD Dead time Source, VBSTx - DRVHx = 100 mV 4 8 1.5 4 4 8 Sink, VDRVLx = 100 mV 1.
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TPS51123A www.ti.
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TPS51123A SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 www.ti.com DEVICE INFORMATION Table 2. 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. GND : disable all circuit ENC 18 I Channel 1 and Channel 2 enable input.
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TPS51123A www.ti.
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TPS51123A SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 www.ti.
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TPS51123A www.ti.com SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 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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TPS51123A SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) . VIN STANDBY CURRENT vs INPUT VOLTAGE 250 250 200 200 IVINSTBY –VIN Standby Current – µA IVINSTBY - VIN Standby Current - mA VIN STANDBY CURRENT vs JUNCTION TEMPERATURE 150 100 50 0 50 0 50 100 150 100 50 0 150 5 10 TJ - Junction Temperature - °C Figure 5.
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TPS51123A www.ti.com SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 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 18 20 22 24 26 V IN - Input Voltage - V TJ - Junction Temperature - °C Figure 9. Figure 10.
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TPS51123A SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 www.ti.com 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 Figure 13. 500 TONSEL = 3.
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TPS51123A www.ti.com SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 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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TPS51123A SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 www.ti.com 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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TPS51123A www.ti.com SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 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 V IN - Input Voltage - V 0.01 0.1 1 10 IOUT1 – 5-V Output Current – A Figure 25. Figure 26.
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TPS51123A SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 www.ti.com 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. 18 Figure 31.
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TPS51123A www.ti.com SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 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. Figure 35.
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TPS51123A SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 www.ti.com 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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TPS51123A www.ti.com SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 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.
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TPS51123A SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 www.ti.com Light Load Condition in Auto-Skip Operation The TPS51123A 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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TPS51123A www.ti.com SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 Enable and Soft Start EN0 is the control pin of VREG5, VREG3 and VREF regulators. Bring this node down to GND disables those three regulators and minimize the shutdown supply current to 10 μA. Pulling this node up to 3.3 V or 5 V will turn the three regulators on to standby mode. The two switch mode power supplies (channel-1, channel-2) become ready to enable at this standby mode. The TPS51123A has an internal, 1.
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TPS51123A SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 www.ti.com Also note that, in the case of Auto-skip or Out-of-Audio™ mode, if the output voltage goes +10% above the target value and the power-good signal flags low, then the loop attempts to correct the output by turning on the low-side driver (forced PWM mode). After the feedback voltage returns to be within +5% of the target value and the power-good signal goes high, the controller returns back to auto-skip mode or Out-of-Audio™ mode.
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TPS51123A www.ti.com SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 Overvoltage and Undervoltage Protection TPS51123A monitors a resistor divided feedback voltage to detect over and under voltage. When the feedback voltage becomes higher than 115% of the target voltage, the OVP comparator output goes high and the circuit latches as the top MOSFET driver OFF and the bottom MOSFET driver ON. Also, TPS51123A monitors VOx voltage directly and if it becomes greater than 5.
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TPS51123A SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 www.ti.com UVLO Protection TPS51123A 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 (VOUT2 - 1 V), both switch mode power supplies are also shut off Thermal Shutdown TPS51123A monitors the temperature of itself.
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TPS51123A www.ti.com SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 Layout Considerations Certain points must be considered before starting a layout work using the TPS51123A. • TPS51123A has only one GND pin and special care of GND trace design makes operation stable, especially when both channels operate.
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TPS51123A SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 www.ti.com SGND VIN VIN 220 nF VOUT2 5 3 2 VFB2 VREF VFB1 DRVL2 VOUT1 DRVL1 5 19 TPS51123A VREG5 PowerPAD GND VREG3 PGND PGND 17 15 10 mF 8 10 mF SGND UDG-10087 Figure 37.
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TPS51123A www.ti.com SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 Figure 38.
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TPS51123A SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 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 3 2 1 VF B1 TR IP1 7 VO2 PGND VIN VIN 5.5 ~ 28V 8 VREG3 VO1 24 PGOOD 23 VBST1 22 VREG5 PGND PGND L1 3.3mH Q1 IRF7821 C4 0.1mF 9 VBST2 R7 5.1W R9 5.1W TPS51123ARGE (QFN24) 10 DRVH2 VO2 3.3V/8A 11 LL2 DRVH1 21 LL1 20 PowerPAD C7 0.
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TPS51123A www.ti.com SLUSAA6C – APRIL 2011 – REVISED SEPTEMBER 2012 REVISION HISTORY Changes from Revision A (May 2011 ) to Revision B • Page Added LL1, LL2, pulse width < 20 ns parameters with a value of -5.0 V to 30 V. ............................................................... 3 Changes from Revision B (MARCH 2012) to Revision C • Page ESD ratings in ABSOLUTE MAXIMUM RATINGS table ......................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 30-Jul-2012 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 TPS51123ARGER VQFN RGE 24 3000 330.0 12.4 4.25 4.25 1.15 8.0 12.0 Q1 TPS51123ARGET 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 30-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS51123ARGER VQFN RGE 24 3000 367.0 367.0 35.0 TPS51123ARGET VQFN RGE 24 250 210.0 185.0 35.
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