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TPS53313

VIN SW

Output All MLCCs

UDG-11254

BST

COMP

BP7

AGND

RT/SYNC

MODE/SS

VBST

PowerPad

PGND

BP3

OUT

PGOOD

TPS53313

www.ti.com

SLUSAS8 –DECEMBER 2011

6-A Step-Down Regulator with Integrated Switcher

Check for Samples: TPS53313

FEATURES

LOW VOLTAGE APPLICATIONS

• 4.5-V to 16-V Conversion Voltage Range

• POL Applications for 5-V or 12-V Step-Down

Rail

• Adjustable Output Voltage Ranging from 0.6 V

to 0.7×V

DESCRIPTION

• Continuous 6-A Output Current

TPS53313 provides a 5-V or 12-V synchronous buck

• Supports All MLCC Output Capacitors

converter that integrates two N-Channel MOSFETs.

• Selectable SKIP Mode or Forced CCM

Due to low R

DS(on)

and TI proprietary SmoothPWM™

skip mode of operation, it optimizes the efficiency at

• Selectable Soft-Start Time (1 ms, 3 ms, or 6

light-load condition without compromising the output

ms)

voltage ripple.

• Selectable 4-5 A, 6-A or 9-A Peak Current Limit

The TPS53313 features programmable (from 250

• Optimized Efficiency at Light and Heavy Loads

kHz to 1.5MHz) switching frequency with selectable

• Voltage Mode Control

skip mode or forced CCM mode operation. The

• Programmable Switching Frequency from

device provides pre-biased startup, soft-stop,

integrated bootstrap switch, power good function,

250 kHz to 1.5 MHz

EN/input UVLO protection. It supports input voltages

• Synchronizes to External Clock

from 4.5 V to 16 V and no extra bias voltage is

• R

DS(on)

Sensing for Zero Crossing Detection

needed. The output voltage is adjustable from 0.6 V

and Overcurrent Protection

up to 0.7 × V

• Soft-Stop Output Discharge During Disable

The TPS53313 is available in a 4 mm × 4 mm,

• Overcurrent, Overvoltage and Undervoltage

24-pin, QFN package (Green RoHs compliant and Pb

Protection with Hiccup

free) and operates between -40°C and 85°C.

• Over-Temperature Protection

• Open-Drain, Power Good Indication

• Internal Bootstrap Switch

• 4 mm × 4 mm, 24-Pin, QFN Package

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.

2SmoothPWM 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 (23 pages)

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TPS53313 SLUSAS8 – DECEMBER 2011 www.ti.com 6-A Step-Down Regulator with Integrated Switcher Check for Samples: TPS53313 FEATURES LOW VOLTAGE APPLICATIONS • • • 1 2 • • • • • • • • • • • • • • • • 4.5-V to 16-V Conversion Voltage Range Adjustable Output Voltage Ranging from 0.6 V to 0.
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TPS53313 SLUSAS8 – DECEMBER 2011 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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TPS53313 SLUSAS8 – DECEMBER 2011 www.ti.com RECOMMENDED OPERATING CONDITIONS (1) (2) VALUE VIN (main supply) Input voltage range MAX 4.5 16.0 VBST –0.1 22.0 VBST to SW –0.1 6.5 –1 18 –2 18 EN –0.1 VVIN + 0.1 FB, MODE/SS –0.1 3.5 COMP, RT/SYNC, BP3 –0.1 3.5 BP7 –0.1 6.5 PGD –0.1 14 GND SW (bidirectional) dc transient < 20 ns Output voltage range UNIT MIN V V –0.1 0.
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TPS53313 SLUSAS8 – DECEMBER 2011 www.ti.com ELECTRICAL CHARACTERISTICS over operating free-air temperature range, VVIN = 12 V, PGND = GND (Unless otherwise noted (unless otherwise noted) PARAMETER CONDITIONS MIN TYP MAX UNIT 16.0 V INPUT SUPPLY VVIN VIN supply voltage Nominal input voltage range VPOR VIN POR threshold Ramp up; EN =HIGH VPOR(hys) VIN POR hysteresis ISTBY Standby current RBOOT Bootstrap on-resistance 4.5 4.00 EN =LOW. VIN = 12 V 4.23 4.
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TPS53313 SLUSAS8 – DECEMBER 2011 www.ti.com ELECTRICAL CHARACTERISTICS (continued) over operating free-air temperature range, VVIN = 12 V, PGND = GND (Unless otherwise noted (unless otherwise noted) PARAMETER CONDITIONS MIN TYP MAX UNIT OVERCURRENT AND ZERO CROSSING When IOUT exceeds this threshold for 4 consecutive cycles, 2.
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TPS53313 SLUSAS8 – DECEMBER 2011 www.ti.com DEVICE INFORMATION VIN VIN VIN 2 VIN PG 1 3 EN RGE (QFN) PACKAGE 24 PINS (BOTTOM VIEW) 4 5 6 24 7 PGND COMP 23 8 PGND 9 PGND FB MODE/SS 22 TPS53313 10 PGND RT/SYNC 21 11 PGND 20 16 15 SW 14 13 SW 17 SW 18 SW 12 PGND VBST BP3 19 Exposed Pad BP7 AGND PIN DESCRIPTIONS PIN I/O (1) DESCRIPTION NAME NO.
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TPS53313 SLUSAS8 – DECEMBER 2011 www.ti.com FUNCTIONAL BLOCK DIAGRAM BP3 BP7 VIN TPS53313 LDO LDO VIN UVLO 0.6 V 0.6 V–17% UV/OV Threshold Generation VBST + UV UV FB 0.6 V+17% + OV OV Control Logic HDRV PWM + COMP E/A + 0.
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TPS53313 SLUSAS8 – DECEMBER 2011 www.ti.com TYPICAL CHARACTERISTICS 16 100 Sourcing Current Sinking Current No Load 12 90 Efficiency (%) Minimum Duty Cycle (%) 14 10 8 6 80 70 60 4 50 2 0 200 400 600 800 1000 1200 Switching Frequency (kHz) 1400 40 1600 0 1 90 90 80 80 Efficiency (%) Efficiency (%) 100 70 60 TA = –40°C TA = 25°C TA = 85°C VIN = 5 V VOUT = 1.2 V 0 1 2 3 4 Load Current (A) 5 40 6 G002 TA = –40°C TA = 25°C TA = 85°C VIN = 14 V VOUT = 1.
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TPS53313 SLUSAS8 – DECEMBER 2011 www.ti.com TYPICAL CHARACTERISTICS (continued) 2.0 119 With Respect to VSEN 1.5 118 MODE/SS Leakage (µA) PGOOD Upper Threshold (%) 120 117 116 115 114 113 112 1.0 0.5 0.0 −0.5 −1.0 −1.5 111 110 −40 −25 −10 5 20 35 50 65 80 Junction Temperature (°C) 95 −2.0 −40 −25 −10 110 125 G007 10 10 9 9 8 7 6 5 4 3 2 1 0 −40 −25 −10 95 110 125 G008 Figure 8. MODE/SS Leakage Current vs.
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TPS53313 SLUSAS8 – DECEMBER 2011 www.ti.com DETAILED DESCRIPTIONS OVERVIEW The TPS53313 is a high-efficiency switching regulator with two integrated N-channel MOSFETs and is capable of delivering up to 6 A of load current. The TPS53316 provides output voltage from 0.6 V up to 0.7 × VIN from 4.5V to 16 V wide input voltage range. The output voltage accuracy is better than ±1% over load, line, and temperature.
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TPS53313 SLUSAS8 – DECEMBER 2011 www.ti.com LIGHT LOAD OPERATION In skip mode, when the load current is less than half of inductor ripple current, the inductor current reaches zero by the end of OFF-Time. The light load control scheme then turns off the low-side MOSFET when inductor current reaches zero. Since there is no negative inductor current, the energy delivered to the load per switching cycle is increased compared to the normal PWM mode operation.
PAGE 12
TPS53313 SLUSAS8 – DECEMBER 2011 www.ti.com UVLO FUNCTION The TPS53313 provides UVLO protection for input voltage, VIN. If the input voltage is lower than UVLO threshold voltage minus the hysteresis, the device shut off. When the voltage rises above the threshold voltage, the device restarts. The typical UVLO rising threshold is 4.23 V. Hysteresis of 200 mV for input voltage is provided to prevent glitch.
PAGE 13
TPS53313 SLUSAS8 – DECEMBER 2011 www.ti.com APPLICATION INFORMATION DESIGN EXAMPLE The following example illustrates the design process and component selection for a single-output synchronous buck converter using the TPS53313. The design example schematic of a is shown in Figure 13. The specification of the converter is listed in Table 3. Table 3.
PAGE 14
TPS53313 SLUSAS8 – DECEMBER 2011 VRIPPLE(C) = www.ti.com IL(ripple) 8 ´ COUT ´ fSW (3) VRIPPLE(ESR) = IL(ripple) ´ ESR VRIPPLE(ESL) (4) V ´ ESL = IN L (5) When ceramic output capacitor is chosen, the ESL component is usually negligible. In the case when multiple output capacitors are used, the total ESR and ESL should be the equivalent of the all output capacitors in parallel. When operating in DCM, the output ripple is dominated by the component determined by capacitance.
PAGE 15
TPS53313 SLUSAS8 – DECEMBER 2011 www.ti.com To minimize the ripple current drawn from the input source, sufficient input decoupling capacitors should be placed close to the device. The ceramic capacitor is recommended due to its low ESR and low ESL. The input voltage ripple can be calculated as below when the total input capacitance is determined by Equation 10.
PAGE 16
TPS53313 SLUSAS8 – DECEMBER 2011 www.ti.com C3 C1 C2 R4 R3 R2 VREF + COMP Gain (dB) R1 UGD-11238 fZ1 fZ2 fP2 fP3 Frequency UDG-11237 Figure 15. Type III Compensation Network Schematic Figure 16. Type III Compensation Network Waveform fP1 = 0 (18) 1 fP2 = 2 ´ p ´ R3 ´ C1 1 1 @ fP3 = æ C2 ´ C3 ö 2 ´ p ´ R4 ´ C3 2 ´ p ´ R4 ´ ç ÷ è C2 + C3 ø (19) (20) The two zeros can be placed near the double pole frequency to cancel the response from the double pole.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 14-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 TPS53313RGER VQFN RGE 24 3000 330.0 12.4 4.25 4.25 1.15 8.0 12.0 Q2 TPS53313RGET 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 14-Jul-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS53313RGER VQFN RGE 24 3000 367.0 367.0 35.0 TPS53313RGET 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 JESD46C and to discontinue any product or service per JESD48B. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.