Datasheet

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TPS54526PWP

Slew Rate (0.35A/µsec)

V (50 mV/div ac coupled)

I (2A/div)

OUT

Time Scale (100µsec/div)

TPS54526

www.ti.com

SLVSB84B –MAY 2012–REVISED JANUARY 2014

4.5-V to 18-V Input, 3-A Synchronous Step-Down Converter with Eco-mode™

Check for Samples: TPS54526

FEATURES

DESCRIPTION

The TPS54526 is an adaptive on-time D-CAP2™

• D-CAP2™ Mode Enables Fast Transient

mode synchronous buck converter. The TPS54526

Response

enables system designers to complete the suite of

• Low Output Ripple and Allows Ceramic Output

various end equipment’s power bus regulators with a

Capacitor

cost effective, low component count, low standby

current solution. The main control loop for the

• Wide V

Input Voltage Range: 4.5 V to 18 V

TPS54526 uses the D-CAP2™ mode control which

• Output Voltage Range: 0.76 V to 5.5 V

provides a very fast transient response with no

• Highly Efficient Integrated FET’s Optimized

external compensation components. The adaptive on-

for Lower Duty Cycle Applications

time control supports seamless transition between

– 63 mΩ (High Side) and 33 mΩ (Low Side)

PWM mode at higher load conditions and Eco-

mode™ operation at light loads. Eco-mode™ allows

• High Efficiency, less than 10 μA at shutdown

the TPS54526 to maintain high efficiency during

• High Initial Bandgap Reference Accuracy

lighter load conditions. The TPS54526 also has a

• Adjustable Soft Start

proprietary circuit that enables the device to adopt to

both low equivalent series resistance (ESR) output

• Pre-Biased Soft Start

capacitors, such as POSCAP, SP-CAP, and ultra-low

• 650-kHz Switching Frequency (f

)

ESR ceramic capacitors. The device operates from

• Cycle By Cycle Over Current Limit

4.5-V to 18-V VIN input. The output voltage can be

programmed between 0.76V and 5.5V. The device

• Power Good Output

also features an adjustable soft start time and a

• Auto-Skip Eco-mode™ for High Efficiency at

power good function. The TPS54526 is available in

Light Load

the 14-pin HTSSOP package and the 16 pin QFN

package, designed to operate from –40°C to 85°C.

APPLICATIONS

• Wide Range of Applications for Low Voltage

System

– Digital TV Power Supply

– High Definition Blu-ray Disc™ Players

– Networking Home Terminal

– Digital Set Top Box (STB)

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-CAP2, Eco-mode, PowerPAD are trademarks of Texas Instruments.

3Blu-ray Disc is a trademark of Blu-ray Disc Association.

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 (29 pages)

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TPS54526 www.ti.com SLVSB84B – MAY 2012 – REVISED JANUARY 2014 4.5-V to 18-V Input, 3-A Synchronous Step-Down Converter with Eco-mode™ Check for Samples: TPS54526 FEATURES DESCRIPTION • The TPS54526 is an adaptive on-time D-CAP2™ mode synchronous buck converter. The TPS54526 enables system designers to complete the suite of various end equipment’s power bus regulators with a cost effective, low component count, low standby current solution.
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TPS54526 SLVSB84B – MAY 2012 – REVISED JANUARY 2014 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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TPS54526 www.ti.com SLVSB84B – MAY 2012 – REVISED JANUARY 2014 RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) VIN MIN MAX 4.5 18 VBST –0.3 24 VBST (10 ns transient) –0.3 27 VBST (vs Sw1, SW2) –0.3 5.7 SS, PG –0.3 5.7 EN –0.3 18 VO, VFB –0.3 5.5 SW1, SW2 –1.8 18 –3 21 Supply input voltage range VI Input voltage range SW1, SW2 (10 ns transient) UNIT V V PGND1, PGND2 –0.3 0.1 VO Output voltage range VREG5 –0.3 5.
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TPS54526 SLVSB84B – MAY 2012 – REVISED JANUARY 2014 www.ti.com ELECTRICAL CHARACTERISTICS (continued) over operating free-air temperature range, VIN = 12V (unless otherwise noted) PARAMETER TEST CONDITIONS MIN TYP MAX 6.1 6.9 8.4 UNIT CURRENT LIMIT Iocl Current limit LOUT = 1.5 μH (2), A THERMAL SHUTDOWN TSDN Thermal shutdown threshold Shutdown temperature Hysteresis (2) 165 (2) °C 35 ON-TIME TIMER CONTROL TON On time VIN = 12 V, VO = 1.
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TPS54526 www.ti.
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TPS54526 SLVSB84B – MAY 2012 – REVISED JANUARY 2014 www.ti.com FUNCTIONAL BLOCK DIAGRAM -35% UV 14 OV 13 1 VO VIN VIN2 VIN1 +25% VREG5 12 Control logic VBST Ref SS 1 shot 11 2 VFB SGND XCON 10 SW2 VREG5 VREG5 Ceramic Capacitor 3 SS 1mF VO SW1 9 PGND2 4 SW Softstart 5 PGND1 ZC SS PGND 8 PGND GND SW OCP SGND PG Ref PGND VIN 6 -10% UV VREG5 EN 7 A. EN Logic OV UVLO UVLO Protection Logic TSD REF Ref The block diagram shown is for the PWP 14 pin package.
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TPS54526 www.ti.com SLVSB84B – MAY 2012 – REVISED JANUARY 2014 At the beginning of each cycle, the high-side MOSFET is turned on. The MOSFET is turned off after the internal one-shot timer expires. The one-shot timer is set by the converter input voltage, VIN, and the output voltage, VO, to maintain a pseudo-fixed frequency over the input voltage range, hence it is called adaptive on-time control.
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TPS54526 SLVSB84B – MAY 2012 – REVISED JANUARY 2014 www.ti.com VREG5 VREG5 is an internally generated voltage source used by the TPS54526. It is derived directly from the input voltage and is nominally regulated to 5.5 V when the input voltage is above 5.6 V. The output of the VREG5 regulator is the input to the internal UVLO function. VREG5 must be above the UVLO wake up threshold voltage (3.6 V typical) for the TPS54526 to function.
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TPS54526 www.ti.com SLVSB84B – MAY 2012 – REVISED JANUARY 2014 TYPICAL CHARACTERISTICS VIN = 12 V, TA = 25 °C (unless otherwise noted) Vin SHUTDOWN CURRENT vs JUNCTION TEMPERATURE 1200 12 1000 10 Supply Current−Shutdown Current (µA) Supply Current (µA) Vin CURRENT vs JUNCTION TEMPERATURE 800 600 400 200 8 6 4 2 VIN = 12 V 0 −50 0 50 100 Junction Temperature (°C) VIN = 12 V 0 −50 150 0 50 100 Junction Temperature (°C) 150 G006 G005 Figure 1. Figure 2.
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TPS54526 SLVSB84B – MAY 2012 – REVISED JANUARY 2014 www.ti.com TYPICAL CHARACTERISTICS VIN = 12 V, TA = 25 °C (unless otherwise noted) 1.05V OUTPUT VOLTAGE vs INPUT VOLTAGE 1.05 V 50 mA to 5.5 A LOAD TRANSIENT RESPONSE 1.10 1.09 VO (50 mV/div ac coupled) 1.08 Output Voltage (V) 1.07 1.06 IOUT (2A/div) 1.05 1.04 1.03 1.02 Slew Rate (0.35A/µsec) 1.01 1.00 IO = 10 mA IO = 1 A 0 5 10 Input Voltage (V) 15 Time Scale (100µsec/div) 20 G007 Figure 5. Figure 6.
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TPS54526 www.ti.com SLVSB84B – MAY 2012 – REVISED JANUARY 2014 TYPICAL CHARACTERISTICS VIN = 12 V, TA = 25 °C (unless otherwise noted) LIGHT LOAD EFFICIENCY vs OUTPUT CURRENT SWITCHING FREQUENCY vs INPUT VOLTAGE (IO=1A) 800 100 90 80 Switching Frequency (kHz) 700 Efficiency (%) 70 60 50 40 30 600 500 20 VOUT = 1.8 V VOUT = 2.5 V VOUT = 3.3 V 10 0 0.001 0.01 0.1 Output Current (A) 1 VOUT = 1.05 V VOUT = 1.8 V VOUT = 3.3 V 10 400 0 5 10 Input Voltage (V) 15 G001 20 G004 Figure 9.
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TPS54526 SLVSB84B – MAY 2012 – REVISED JANUARY 2014 www.ti.com TYPICAL CHARACTERISTICS VIN = 12 V, TA = 25 °C (unless otherwise noted) ECO-MODE VOLTAGE RIPPLE AT OUTPUT (IO = 30 mA) VO = 1.05 V IO = 30 mA VOLTAGE RIPPLE AT INPUT (IO=5.5A) VO = 1.05 V VIN (50 mV/div ac coupled) VO (20 mV/div ac coupled) SW (5 V/div) SW (5 V/div) Figure 13. Figure 14. OUTPUT CURRENT vs AMBIENT TEMPERATURE 6 Output Current (A) 5 4 3 2 1 VOUT = 1.0 − 4.5 V VOUT = 5.0 V VOUT = 5.
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TPS54526 www.ti.com SLVSB84B – MAY 2012 – REVISED JANUARY 2014 DESIGN GUIDE Step By Step Design Procedure To • • • • • begin the design process, you must know a few application parameters: Input voltage range Output voltage Output current Output voltage ripple Input voltage ripple U1 TPS54526PWP Figure 16. Schematic Diagram for This Design Example Output Voltage Resistors Selection The output voltage is set with a resistor divider from the output node to the VFB pin.
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TPS54526 SLVSB84B – MAY 2012 – REVISED JANUARY 2014 www.ti.com Table 1. Recommended Component Values C4 (pF) (1) Output Voltage (V) R1 (kΩ) R2 (kΩ) L1 (µH) C8 + C9 (µF) 1 6.81 22.1 1.0 - 1.5 22 - 68 1.05 8.25 22.1 1.0 - 1.5 22 - 68 1.2 12.7 22.1 1.0 - 1.5 22 - 68 1.5 21.5 22.1 1.5 22 - 68 1.8 30.1 22.1 5 - 22 1.5 22 - 68 2.5 49.9 22.1 5 - 22 2.2 22 - 68 3.3 73.2 22.1 5 - 22 2.2 22 - 68 5 124 22.1 5 - 22 3.
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TPS54526 www.ti.com SLVSB84B – MAY 2012 – REVISED JANUARY 2014 VREG5 Capacitor Selection A 1.0 μF ceramic capacitor must be connected between the VREG5 to GND pin for proper operation. It is recommended to use a ceramic capacitor. THERMAL INFORMATION This PowerPad™ package incorporates an exposed thermal pad that is designed to be directly to an external heatsink. The thermal pad must be soldered directly to the printed board (PCB). After soldering, the PCB can be used as a heatsink.
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TPS54526 SLVSB84B – MAY 2012 – REVISED JANUARY 2014 www.ti.com LAYOUT CONSIDERATIONS • • • • • • • • • • • • • • Keep the input switching current loop as small as possible. Keep the SW node as physically small and short as possible to minimize parasitic capacitance and inductance and to minimize radiated emissions. Kelvin connections should be brought from the output to the feedback pin of the device. Keep analog and non-switching components away from switching components.
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TPS54526 www.ti.
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TPS54526 SLVSB84B – MAY 2012 – REVISED JANUARY 2014 www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 20-Nov-2013 Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties.
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PACKAGE MATERIALS INFORMATION www.ti.com 20-Nov-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) TPS54526PWPR HTSSOP PWP 14 2000 330.0 12.4 TPS54526RSAR QFN RSA 16 3000 330.0 TPS54526RSAT QFN RSA 16 250 180.0 6.9 5.6 1.6 8.0 12.0 Q1 12.4 4.25 4.25 1.15 8.0 12.0 Q2 12.4 4.25 4.25 1.15 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 20-Nov-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS54526PWPR HTSSOP PWP 14 2000 367.0 367.0 35.0 TPS54526RSAR QFN RSA 16 3000 367.0 367.0 35.0 TPS54526RSAT QFN RSA 16 250 210.0 185.0 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.