Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - voltage regulators - DC DC switch controllers D-CAP™ WSON 10

VBST

DRVH

V5IN

PGOOD

TRIP

VFB

TPS51218

5 6DRVLRF

GND

OUT

_GND

V5IN

UDG-09064

TPS51218

www.ti.com

SLUS935B –MAY 2009– REVISED FEBRUARY 2012

HIGH PERFORMANCE, SINGLE SYNCHRONOUS STEP-DOWN

CONTROLLER FOR NOTEBOOK POWER SUPPLY

Check for Samples: TPS51218

FEATURES

APPLICATIONS

• Wide Input Voltage Range: 3 V to 28 V

• Notebook Computers

• Output Voltage Range: 0.7 V to 2.6 V • I/O Supplies

• Wide Output Load Range: 0 to 20A+ • System Power Supplies

• Built-in 0.5% 0.7 V Reference

DESCRIPTION

• D-CAP™ Mode with 100-ns Load Step

The TPS51218 is a small-sized single buck controller

Response

with adaptive on-time D-CAP™ mode. The device is

• Adaptive On Time Control Architecture With 4

suitable for low output voltage, high current, PC

Selectable Frequency Setting

system power rail and similar point-of-load (POL)

power supply in digital consumer products. A small

• 4700 ppm/°C R

DS(on)

Current Sensing

package with minimal pin-count saves space on the

• Internal 1-ms Voltage Servo Softstart

PCB, while a dedicated EN pin and pre-set frequency

• Pre-Charged Start-up Capability

selections minimize design effort required for new

• Built in Output Discharge

designs. The skip-mode at light load condition, strong

gate drivers and low-side FET R

DS(on)

current sensing

• Power Good Output

supports low-loss and high efficiency, over a broad

• Integrated Boost Switch

load range. The conversion input voltage which is the

• Built-in OVP/UVP/OCP

high-side FET drain voltage ranges from 3 V to 28 V

and the output voltage ranges from 0.7 V to 2.6 V.

• Thermal Shutdown (Non-latch)

The device requires an external 5-V supply. The

• SON-10 (DSC) Package

TPS51218 is available in a 10-pin SON package

specified from –40°C to 85°C.

TYPICAL APPLICATION CIRCUIT

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 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 (27 pages)

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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com HIGH PERFORMANCE, SINGLE SYNCHRONOUS STEP-DOWN CONTROLLER FOR NOTEBOOK POWER SUPPLY Check for Samples: TPS51218 FEATURES APPLICATIONS • • • • • • • • 1 2 • • • • • • • • • • Wide Input Voltage Range: 3 V to 28 V Output Voltage Range: 0.7 V to 2.6 V Wide Output Load Range: 0 to 20A+ Built-in 0.5% 0.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 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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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) MIN Supply voltage Input voltage range 4.5 6.5 VBST –0.1 34.5 SW –1 28 SW (1) –4 28 –0.1 6.5 (2) –0.1 6.5 –1 34.5 DRVH (1) –4 34.5 DRVH (2) –0.1 6.5 DRVL –0.3 6.5 PGOOD –0.1 6.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com ELECTRICAL CHARACTERISTICS over recommended free-air temperature range, V5IN=5V. (Unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX UNIT 320 500 μA 1 μA SUPPLY CURRENT IV5IN V5IN supply current V5IN current, TA = 25°C, No Load, VEN = 5 V, VVFB = 0.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com ELECTRICAL CHARACTERISTICS (continued) over recommended free-air temperature range, V5IN=5V. (Unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX 9 10 11 UNIT PROTECTION: CURRENT SENSE ITRIP TRIP source current VTRIP = 1V, TA = 25°C TCITRIP TRIP current temperature coeffficient On the basis of 25°C VTRIP Current limit threshold setting range VTRIP-GND Voltage 0.2 VTRIP = 3.0 V 355 375 395 VTRIP = 1.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com DEVICE INFORMATION DSC PACKAGE (TOP VIEW) PGOOD 1 10 VBST TRIP 2 9 DRVH EN 3 8 SW VFB 4 7 V5IN RF 5 6 DRVL TPS51218DSC GND Thermal pad is used as an active terminal of GND. PIN FUNCTIONS PIN I/O DESCRIPTION NAME NO. DRVH 9 O High-side MOSFET driver output. The SW node referenced floating driver.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com FUNCTIONAL BLOCK DIAGRAM 0.7 V –30% + UV + OV 0.7 V +10/15% PGOOD + Delay + 0.7 V +20% 0.7 V –5/10% Enable/SS Control VBST Control Logic EN PWM + VFB + + SW + Ramp Comp XCON 0.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com TYPICAL CHARACTERISTICS V5IN SUPPLY CURRENT vs JUNCTION TEMPERATURE V5IN SHUTDOWN CURRENT vs JUNCTION TEMPERATURE 800 20 VV5IN = 5 V VEN = 5 V VVFB = 0.735 V No Load IV5INSDN – V5IN Shutdown Current – mA IV5IN – V5IN Supply Current – mA 1000 600 400 200 0 –50 0 50 100 18 16 VV5IN = 5 V VEN = 0 V No Load 14 12 10 8 6 4 2 0 –50 150 0 Figure 1. Figure 2.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) SWITCHING FREQUENCY vs INPUT VOLTAGE SWITCHING FREQUENCY vs OUTPUT CURRENT 1000 IO = 10 A Auto-Skip 450 fSW – Switching Frequency – kHz fSW – Switching Frequency – kHz 500 RRF = 39 kW 400 RRF = 100 kW 350 RRF = 200 kW RRF = 470 kW 300 250 FCCM 100 10 Auto-Skip 1 VIN = 12 V RRF = 470 kW 200 6 8 10 12 16 14 20 18 0.1 0.001 22 0.01 VIN – Input Voltage – V 1 Figure 5. Figure 6.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) SWITCHING FREQUENCY vs OUTPUT CURRENT OUTPUT VOLTAGE vs OUTPUT CURRENT 1.12 MODE Auto-Skip FCCM FCCM 100 1.11 VOUT – Output Voltage – V fSW – Switching Frequency – kHz 1000 10 1.10 Auto-Skip 1 1.09 VIN = 12 V RRF = 39 kW 0.1 0.001 0.01 0.1 1 10 VIN = 12 V RRF = 470 kW 1.08 0.001 100 0.01 0.1 1 10 100 IOUT – Output Current – A IOUT – Output Current – A Figure 9. Figure 10.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) Figure 13. 1.1-V Start-Up Waveform X X X Figure 14. Pre-Biased Start-Up Waveform X X X Figure 15. 1.1-V Soft-Stop Waveform X X X Figure 16. 1.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com APPLICATION INFORMATION GENERAL DESCRIPTION The TPS51218 is a high-efficiency, single channel, synchronous buck regulator controller suitable for low output voltage point-of-load applications in notebook computers and similar digital consumer applications. The device features proprietary D-CAP™ mode control combined with adaptive on-time architecture.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com SMALL SIGNAL MODEL From small-signal loop analysis, a buck converter using D-CAP™ mode can be simplified as shown in Figure 17. Switching Modulator VIN DRVH R1 VFB Control Logic and Driver PWM + R2 + L IIND DRVL VOUT IOUT IC 0.7 V ESR RL Voltage Divider VC CO Output Capacitor UDG-09063 Figure 17.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com LIGHT LOAD CONDITION IN AUTO-SKIP OPERATION With RF pin pulled down to low via RRF, the TPS51218 automatically reduces switching frequency at light load conditions to maintain high efficiency.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com POWER-GOOD The TPS51218 has powergood output that indicates high when switcher output is within the target. The powergood function is activated after soft-start has finished. If the output voltage becomes within +10%/–5% of the target value, internal comparators detect power-good state and the power-good signal becomes high after a 1-ms internal delay.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com EXTERNAL COMPONENTS SELECTION Selecting external components is simple in D-CAP™ mode. 1. Choose the inductor. The inductance value should be determined to give the ripple current of approximately 1/4 to 1/2 of maximum output current. Larger ripple current increases output ripple voltage and improves S/N ratio and helps stable operation.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com 3. Determine the value of R1 and R2. The output voltage is programmed by the voltage-divider resistor, R1 and R2, shown in Figure 17. R1 is connected between the VFB pin and the output, and R2 is connected between the VFB pin and GND. Typical designs begin with the selection of an R2 value between 10 kΩ and 20 kΩ. Determine R1 using Equation 9. IIND(ripple) ´ ESR ö æ çç VOUT ÷÷ - 0.7 2 è ø ´ R2 R1 = 0.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 • • • • • www.ti.com from gate of the low-side MOSFET through the gate driver and GND pad of the device, and back to source of the low-side MOSFET through ground. Connect negative node of V5IN capacitor, source of the low-side MOSFET and GND pad of the device at ground as close as possible.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com TPS51218 APPLICATION CIRCUITS V5IN 4.5 V to 6.5 V R1 5.6 kW U1 TPS51218 R6 100 kW C3 10 mF x 4 C1 0.1 mF 1 PGOOD VBST 10 2 TRIP DRVH 9 3 EN SW 8 4 VFB V5IN 7 5 RF DRVL 6 Q1 FDMS8680 R7 R3 1 kW 3.3 W EN R2 10 kW L1 0.45 mH R5 30 kW GND Q2 FDMS8670AS Q3 FDMS8670AS VOUT 1.1 V 18 A C4 330 mF x 4 C2 1 mF R4(A) 470 kW VIN 8V to 20 V VOUT_GND UDG-09068 Figure 21. 1.1-V/18-A Auto-Skip Mode V5IN 4.5 V to 6.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com Table 2. 1.1-V, 18-A, 290-kHz Application List of Materials REFERENCE DESIGNATOR QTY SPECIFICATION MANUFACTURER PART NUMBER Taiyo Yuden TMK325BJ106MM C3 1 4 × 10 μF, 25 V C4 1 4 × 330 μF, 2 V, 12 mΩ Panasonic EEFCX0D331XR L1 1 0.45 μH, 25 A, 1.1 mΩ Panasonic ETQP4LR45XFC Q1 1 30 V, 35 A, 8.5 mΩ Fairchild FDMS8680 Q2, Q3 2 30 V, 42 A, 3.
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TPS51218 SLUS935B – MAY 2009 – REVISED FEBRUARY 2012 www.ti.com Changes from Revision A (June 2009) to Revision B Page • Added DRVH, pulse width < 20 ns rating in ABSOLUTE MAXIMUM RATINGS table ........................................................ 2 • Added DRVL, pulse width < 20 ns rating in ABSOLUTE MAXIMUM RATINGS table .........................................................
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Mar-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 TPS51218DSCR WSON DSC 10 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS51218DSCR WSON DSC 10 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS51218DSCT WSON DSC 10 250 180.0 12.4 3.3 3.3 1.1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-Mar-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS51218DSCR WSON DSC 10 3000 367.0 367.0 35.0 TPS51218DSCR WSON DSC 10 3000 367.0 367.0 35.0 TPS51218DSCT WSON DSC 10 250 210.0 185.0 35.0 TPS51218DSCT WSON DSC 10 250 210.0 185.0 35.
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