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TPS54525

Slew Rate (0.35A/µsec)

V (50 mV/div ac coupled)

I (2A/div)

OUT

Time Scale (100µsec/div)

TPS54525

www.ti.com

SLVSB82A –MAY 2012–REVISED JULY 2013

4.5V to 18V Input, 5.5-A Synchronous Step-Down Converter

Check for Samples: TPS54525

FEATURES

DESCRIPTION

The TPS54525 is an adaptive on-time D-CAP2™

• D-CAP2™ Mode Enables Fast Transient

mode synchronous buck converter. The TPS54525

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

TPS54525 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 TPS54525

for Lower Duty Cycle Applications

also has a proprietary circuit that enables the device

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

to adopt to both low equivalent series resistance

(ESR) output capacitors, such as POSCAP or SP-

• High Efficiency, less than 10 μA at shutdown

CAP, and ultra-low ESR ceramic capacitors. The

• High Initial Bandgap Reference Accuracy

device operates from 4.5-V to 18-V VIN input. The

• Adjustable Soft Start

output voltage can be programmed between 0.76 V

and 5.5 V. The device also features an adjustable

• Pre-Biased Soft Start

soft start time and a power good function. The

• 650-kHz Switching Frequency (f

)

TPS54525 is available in the 14-pin HTSSOP

• Cycle By Cycle Over Current Limit

package, and designed to operate from –40°C to

85°C.

• Power Good Output

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, 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 (24 pages)

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TPS54525 www.ti.com SLVSB82A – MAY 2012 – REVISED JULY 2013 4.5V to 18V Input, 5.5-A Synchronous Step-Down Converter Check for Samples: TPS54525 FEATURES DESCRIPTION • The TPS54525 is an adaptive on-time D-CAP2™ mode synchronous buck converter. The TPS54525 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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TPS54525 SLVSB82A – MAY 2012 – REVISED JULY 2013 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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TPS54525 www.ti.com SLVSB82A – MAY 2012 – REVISED JULY 2013 RECOMMENDED OPERATING CONDITIONS over operating free-air temperature range (unless otherwise noted) VIN Supply input voltage range VI Input voltage range 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 SW1, SW2 (10 ns transient) UNIT V V –3 21 PGND1, PGND2 –0.3 0.1 –0.3 5.
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TPS54525 SLVSB82A – MAY 2012 – REVISED JULY 2013 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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TPS54525 www.ti.com SLVSB82A – MAY 2012 – REVISED JULY 2013 DEVICE INFORMATION PWP PACKAGE (TOP VIEW) 1 2 3 VO VFB VREG5 POWER PAD VIN2 14 VIN1 13 VBST 12 SW2 11 SW1 10 TPS54525 4 SS PWP HTSSOP14 5 GND 6 PG PGND2 9 7 EN PGND1 8 PIN FUNCTIONS PIN NAME NO. DESCRIPTION VO 1 Connect to output of converter. This pin is used for output discharge function. VFB 2 Converter feedback input. Connect to output voltage with feedback resistor divider. VREG5 3 5.
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TPS54525 SLVSB82A – MAY 2012 – REVISED JULY 2013 www.ti.
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TPS54525 www.ti.com SLVSB82A – MAY 2012 – REVISED JULY 2013 OVERVIEW The TPS54525 is a 5.5-A synchronous step-down (buck) converter with two integrated N-channel MOSFETs. It operates using D-CAP2™ mode control. The fast transient response of D-CAP2™ control reduces the output capacitance required to meet a specific level of performance. Proprietary internal circuitry allows the use of low ESR output capacitors including ceramic and special polymer types.
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TPS54525 SLVSB82A – MAY 2012 – REVISED JULY 2013 www.ti.com VREG5 VREG5 is an internally generated voltage source used by the TPS54525. 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 TPS54525 to function.
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TPS54525 www.ti.com SLVSB82A – MAY 2012 – REVISED JULY 2013 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 G001 G002 Figure 1. Figure 2. EN CURRENT vs EN VOLTAGE 1.
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TPS54525 SLVSB82A – MAY 2012 – REVISED JULY 2013 www.ti.com TYPICAL CHARACTERISTICS VIN = 12 V, TA = 25 °C (unless otherwise noted) 1.05-V OUTPUT VOLTAGE vs INPUT VOLTAGE 1.05-V, 50-mA to 5.5-A LOAD TRANSIENT RESPONSE 1.07 VO (50 mV/div ac coupled) Output Voltage (V) 1.06 IOUT (2A/div) 1.05 1.04 Slew Rate (0.35A/µsec) IO = 0 A IO = 1 A 1.03 0 5 10 Input Voltage (V) 15 Time Scale (100µsec/div) 20 G005 Figure 5. Figure 6.
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TPS54525 www.ti.com SLVSB82A – MAY 2012 – REVISED JULY 2013 TYPICAL CHARACTERISTICS VIN = 12 V, TA = 25 °C (unless otherwise noted) SWITCHING FREQUENCY vs INPUT VOLTAGE (IO = 1 A) SWITCHING FREQUENCY vs OUTPUT CURRENT 800 800 750 700 Switching Frequency (kHz) Switching Frequency (kHz) 700 600 500 600 550 500 VOUT = 1.05 V VOUT = 1.8 V VOUT = 3.3 V 400 650 0 5 10 Input Voltage (V) 15 VOUT = 1.05 V VOUT = 1.8 V VOUT = 3.3 V 450 20 400 0 0.5 1 1.5 2 2.5 3 3.5 Output Current (A) 4 4.
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TPS54525 SLVSB82A – MAY 2012 – REVISED JULY 2013 www.ti.com TYPICAL CHARACTERISTICS VIN = 12 V, TA = 25 °C (unless otherwise noted) 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 = 5.5 V VIN = 12 V 0 −50 −25 0 25 50 Ambient Temperature (°C) 75 100 G008 Figure 13.
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TPS54525 www.ti.com SLVSB82A – MAY 2012 – REVISED JULY 2013 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 TPS54525PWP Figure 14. Shows the 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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TPS54525 SLVSB82A – MAY 2012 – REVISED JULY 2013 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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TPS54525 www.ti.com SLVSB82A – MAY 2012 – REVISED JULY 2013 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 heartsick. The thermal pad must be soldered directly to the printed board (PCB). After soldering, the PCB can be used as a heartsick.
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TPS54525 SLVSB82A – MAY 2012 – REVISED JULY 2013 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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TPS54525 www.ti.
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 29-May-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device TPS54525PWPR Package Package Pins Type Drawing SPQ HTSSOP 2000 PWP 14 Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 330.0 12.4 Pack Materials-Page 1 6.9 B0 (mm) K0 (mm) P1 (mm) 5.6 1.6 8.0 W Pin1 (mm) Quadrant 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 29-May-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS54525PWPR HTSSOP PWP 14 2000 367.0 367.0 35.
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