Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - voltage regulators - DC DC switch controllers D-CAP™ VQFN 24

75 kΩ

PGOOD1

EN1

PGOOD2

EN2

TPS59124RGE

13 14 15 16

VBST1

DRVL1

LL1

DRVH1

VBST2

DRVH2

LL2

DRVL2

6 5 4 3 2 1

VO1

1.05 V/10 A

IRF8113

IRF7821

VO2

1.5 V/10 A

IRF8113

IRF7821

Input Voltage

3 V to 28 V

PowerPAD

6.8

V5IN

4.5 V to 5.5 V

VO2

VO1

VFB2

TONSEL

GND

VFB1

PGND2

TRIP2

V5FILT

V5IN

TRIP1

PGND1

Power

Good2

EN2

Power

Good1

EN1

SGND

PGNDPGND

SGND

SGND PGND

PGND

73.2 kΩ

kΩ

28.7 kΩ

22 µF

2 x 330 µF

1 µH

10 µF

0.1 µF

4.7 μF

6.8 kΩ

1 μF

3.3Ω

kΩ

0.1 µF

10 µF

1 µH

2 x 330 µF

TPS59124

www.ti.com

SLUSA58 –JULY 2010

Dual Synchronous Step-Down Controller

for Low-Voltage Power Rails in Embedded Computing Systems

FEATURES

DESCRIPTION

• High Efficiency, Low-Power Consumption,

Shutdowns to <1 mA

The TPS59124 is a dual, adaptive on-time D-CAP™

mode synchronous buck controller. This device

• Fixed Frequency Emulated On-Time Control,

enables system designers to cost effectively complete

Frequency Selectable From Three Options

the suite of embedded computer power bus

• D-CAP™ Mode Enables Fast Transient

regulators with the absolute lowest external

Response

component count and lowest standby consumption.

• Auto-Skip Mode

The fixed-frequency emulated adaptive on-time

control supports seamless operation between PWM

• Less Than 1% Initial Reference Accuracy

mode at heavy load condition and reduced frequency

• Low Output Ripple

operation at light load for high-efficiency down to

• Wide Input Voltage Range: 3 V to 28 V

milliampere range. The main control loop for the

TPS59124 uses the D-CAP mode that optimized for

• Output Voltage Range: 0.76 V to 5.5 V

low-ESR output capacitors such as POSCAP or

• Low-Side R

DS(on)

Loss-less Current Sensing

SP-CAP promises fast transient response with no

• Adaptive Gate Drivers With Integrated Boost

external compensation. Simple and separate power

Diode

good signals for each channel allow flexibility of

power sequencing. The device provides convenient

• Internal 1.2-ms Voltage-Servo Soft Start

and efficient operation with supply input voltages

• Power-Good Signals for Each Channel With

(V5IN, V5FILT) ranging from 4.5 V to 5.5 V,

Delay Timer

conversion voltages (drain voltage for the

• Output Discharge During Disable, Fault

synchronous high-side MOSFET) from 3 V to 28 V

and output voltages from 0.76 V to 5.5 V.

APPLICATIONS

The TPS59124 is available in 24-pin QFN package

• I/O and Low Voltage System Bus in Embedded

specified from –40°C to 85°C ambient temperature

Computing Systems

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.

2D-CAP, PowerPAD 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 (25 pages)

PAGE 1
TPS59124 www.ti.
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TPS59124 SLUSA58 – JULY 2010 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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TPS59124 www.ti.com SLUSA58 – JULY 2010 ELECTRICAL CHARACTERISTICS over operating free-air temperature range, VV5IN = VV5FILT = 5 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 350 700 mA SUPPLY CURRENT IV5FILT V5FILT supply current V5FILT current, no load, VEN1 = VEN2 = 5 V, VVFB1 = VVFB2 = 0.77 V, VLL1 = VLL2 = 0.
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TPS59124 SLUSA58 – JULY 2010 www.ti.com ELECTRICAL CHARACTERISTICS (Continued) over operating free-air temperature range, V5IN = V5FILT = 5 V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT Wake up 3.7 4.0 4.3 V Hysteresis 0.2 0.3 0.4 V Wake up 1.0 1.3 1.5 V 0.1 mA UVLO/LOGIC THRESHOLD VUV5VFILT V5FILT UVLO threshold VEN ENx threshold IEN ENx input current Hysteresis 0.2 Absolute value (1) 0.02 Fast (1) VTONSEL TONSEL threshold V5FILT –0.
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TPS59124 www.ti.com SLUSA58 – JULY 2010 DEVICE INFORMATION TERMINAL FUNCTIONS TERMINAL NAME NO. DRVH1 21 DRVH2 10 DRVL1 19 DRVL2 12 EN1 23 EN2 8 GND 3 LL1 20 LL2 11 PGND1 18 PGND2 13 PGOOD1 24 PGOOD2 7 TONSEL 4 TRIP1 17 TRIP2 14 VBST1 22 I/O DESCRIPTION O Synchronous high-side MOSFET driver outputs. LL node referenced floating drivers. The gate drive voltage is defined by the voltage across VBST to LL node flying capacitor.
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TPS59124 SLUSA58 – JULY 2010 www.ti.com FUNCTIONAL BLOCK DIAGRAM Frequency Control V5IN 160 °C/ 150 °C 4V FAST MID 4 V/3.
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TPS59124 www.ti.com SLUSA58 – JULY 2010 DETAILED DESCRIPTION PWM OPERATION The main control loop of the switching 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 uses an internal compensation circuit and is suitable for low external component-count configuration, with appropriate amount of ESR at the output capacitor(s). The output voltage is monitored at a feedback point voltage.
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TPS59124 SLUSA58 – JULY 2010 www.ti.com DETAILED DESCRIPTION (continued) LOW-SIDE DRIVER The low-side driver is designed to drive high current low RDS(on) N-channel MOSFET(s). The drive capability is represented by its internal resistances, which are 4 Ω for V5IN to DRVLx, and 1 Ω for DRVLx to PGNDx. A dead time to prevent shoot through is internally generated between high-side MOSFET off to low-side MOSFET on, and low-side MOSFET off to high-side MOSFET on.
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TPS59124 www.ti.com SLUSA58 – JULY 2010 DETAILED DESCRIPTION (continued) OUTPUT DISCHARGE CONTROL TPS59124 discharges the output when ENx is low, or the controller is turned off by the protection functions (OVP, UVP, UVLO, and thermal shutdown). TPS59124 discharges outputs using an internal, 10-Ω MOSFET which is connected to VOx and PGNDx. The external low-side MOSFET is not turned on for the output discharge operation to avoid the possibility of causing negative voltage at the output.
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TPS59124 SLUSA58 – JULY 2010 www.ti.com TYPICAL CHARACTERISTICS V5FILT SUPPLY CURRENT vs JUNCTION TEMPERATURE V5FILT SHUTDOWN CURRENT vs JUNCTION TEMPERATURE 1 I V5FLTSDN − Shutdown Current − µ A I V5FILT − Supply Current − µ A 500 400 300 200 100 0 −50 0 50 100 TJ − Junction Temperature − 5C 0.8 0.6 0.4 0.2 0 −50 150 0 50 100 TJ − Junction Temperature − 5C Figure 1. Figure 2.
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TPS59124 www.ti.com SLUSA58 – JULY 2010 TYPICAL CHARACTERISTICS (continued) OVP/UVP THRESHOLD vs JUNCTION TEMPERATURE SWITCHING FREQUENCY (SLOW) vs INPUT VOLTAGE 500 140 fSW − Switching Frequency − kHz VOVP VUVP − OVP/UVP Threshold − % TONSEL = GND 120 OVP 100 80 UVP 60 40 −50 400 CH1 200 100 0 0 50 100 TJ − Junction Temperature − 5C CH2 300 150 0 5 Figure 6.
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TPS59124 SLUSA58 – JULY 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) SWITCHING FREQUENCY (SLOW) vs OUTPUT CURRENT SWITCHING FREQUENCY (MED) vs OUTPUT CURRENT 500 500 TONSEL = FLOAT fSW − Switching Frequency − kHz fSW − Switching Frequency − kHz TONSEL = GND 400 CH2 300 200 CH1 100 0 0.001 0.01 0.1 1 400 CH2 300 CH1 200 100 0 0.001 10 0.01 0.1 1 IO − Output Current − A IO − Output Current − A Figure 9. Figure 10. (2) SWITCHING FREQUENCY (FAST) vs OUTPUT CURRENT 1.
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TPS59124 www.ti.com SLUSA58 – JULY 2010 TYPICAL CHARACTERISTICS (continued) 1.5-V OUTPUT VOLTAGE vs OUTPUT CURRENT 1.05-V OUTPUT VOLTAGE vs INPUT VOLTAGE 1.1 1.575 1.05 V TONSEL = FLOAT 1.5 V TONSEL = FLOAT VOUT1 − Output Voltage − V VOUT2 − Output Voltage − V 1.550 VI = 21 V 1.525 1.500 VI = 7 V VI = 12 V 1.475 1.075 IO = 0 A 1.050 IO = 5 A 1.025 1.450 1.425 0.001 1 0.01 0.1 1 IOUT2 − Output Current − A Figure 13. 0 10 20 25 Figure 14. 1.05-V EFFICIENCY vs OUTPUT CURRENT 100 1.575 1.
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TPS59124 SLUSA58 – JULY 2010 www.ti.com TYPICAL CHARACTERISTICS (continued) 1.5-V EFFICIENCY vs OUTPUT CURRENT 100 VI = 7 V 1.5 V TONSEL = FLOAT TONSEL = FLOAT 80 VI = 21 V − Efficiency − % 1.05-V LOAD TRANSIENT RESPONSE VOUT1 (50 mV/div) VI = 12 V 60 IIND1 (5 A/div) 40 20 0 0.001 IOUT1 (5 A/div) 0.01 0.1 1 IOUT2 − Output Current − A Figure 17. t − Time − 20 ms/div Figure 18. (4) 1.5-V LOAD TRANSIENT RESPONSE TONSEL = FLOAT 10 1.
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TPS59124 www.ti.com SLUSA58 – JULY 2010 TYPICAL CHARACTERISTICS (continued) 1.5-V START-UP WAVEFORMS 1.05-V DISCHARGE WAVEFORMS EN2 (5 V/div) EN1 (5 V/div) VO2 (0.5 V/div) VO1 (1 V/div) PGOOD1 (5 V/div) PGOOD2 (5 V/div) DRVL1 (5 V/div) t − Time − 500 ms/div Figure 21. t − Time −1 ms/div Figure 22. (5) 1.5-V DISCHARGE WAVEFORMS EN2 (5 V/div) VO2 (1 V/div) PGOOD2 (5 V/div) DRVL2 (5 V/div) t − Time − 1 ms/div Figure 23.
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TPS59124 SLUSA58 – JULY 2010 www.ti.com APPLICATION INFORMATION LOOP COMPENSATION AND EXTERNAL PARTS SELECTION A buck converter system using D-CAP Mode can be simplified as shown in Figure 24. VIN R1 DRVH PWM VFB − + R2 + Control Logic And Driver Lx IL 0.758V Voltage Divider IC DRVL IO ESR Vc Switching Modulator RL Co Output Capacitor Figure 24. Simplifying the Modulator The output voltage is compared with an internal reference voltage after divider resistors, R1 and R2.
PAGE 17
TPS59124 www.ti.com SLUSA58 – JULY 2010 The external components selection is much simpler in D-CAP Mode. 1. Determine the value of R1 and R2. Recommended R2 value is from 10 kΩ to 100 kΩ. Determine R1 using Equation 6. + 0.758 ö æV R1 = ç OUT ÷ ´ R2 0.758 è ø (6) 2. Choose inductor. The inductance value should be determined to give the ripple current of approximately 1/4 to 1/2 of maximum output current.
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TPS59124 SLUSA58 – JULY 2010 www.ti.com Input Voltage 3 V to 28 V 2 GND VFB1 TONSEL 9 VBST2 1 EN1 23 TPS59124RGE 13 PGND 4.5 V to 5.5 V 14 15 16 17 R7 R3 3.3Ω 6.8 kΩ R6 6.8 kΩ C7 4.7 μF PGND TRIP1 C4 2 x 330 µF V5FILT 12 DRVL2 PGND1 LL1 20 V5IN 11 LL2 V5IN EN1 C2 0.1 µF DRVH1 21 10 DRVH2 Q4 IRF8113 Power Good1 PGOOD1 24 VBST1 22 TRIP2 L2 1 µH 3 PowerPAD 8 EN2 C5 0.1 µF R1 28.7 kΩ TM PGND2 VO2 1.
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PACKAGE OPTION ADDENDUM www.ti.
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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 TPS59124RGER VQFN RGE 24 3000 330.0 12.4 4.25 4.25 1.15 8.0 12.0 Q2 TPS59124RGET 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) TPS59124RGER VQFN RGE 24 3000 367.0 367.0 35.0 TPS59124RGET VQFN RGE 24 250 210.0 185.0 35.
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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.