Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsPMIC - DC/DC voltage regulator Holder VSSOP 8

100

0.001 0.01 0.05

Output Current (A)

Efficiency (%)

= 5 V, fsw = 100 kHz, EN Floating

= 3.3 V, fsw = 400 kHz

= 10 V

G000

TPS54062

www.ti.com

SLVSAV1B –MAY 2011–REVISED AUGUST 2012

4.7V to 60V Input, 50mA Synchronous Step-Down Converter with Low IQ

Check for Samples: TPS54062

FEATURES

DESCRIPTION

The TPS54062 device is a 60 V, 50-mA, synchronous

• Integrated High Side and Low Side MOSFET

step-down converter with integrated high side and low

• Peak Current Mode Control

side MOSFETs. Current mode control provides

• Diode Emulation for Improved Light Load

simple external compensation and flexible component

Efficiency

selection. The non-switching supply current is 89 µA.

Using the enable pin, shutdown supply current is

• 89 µA (typical) Operating Quiescent Current

reduced to 1.7 µA.

• 100 kHz to 400 kHz Adjustable Switching

Under voltage lockout is internally set at 4.5 V, but

Frequency

can be increased using the accurate enable pin

• Synchronizes to External Clock

threshold. The output voltage startup ramp is

• Internal Slow Start

controlled by the internal slow start time.

• 0.8 V ±2% Voltage Reference

Adjustable switching frequency range allows

• Stable with Ceramic Output Capacitors or Low

efficiency and external component size to be

Cost Aluminum Electrolytic

optimized. Frequency fold back and thermal

shutdown protects the part during an overload

• Cycle-by-Cycle Current Limit, Thermal and

condition.

Frequency Fold Back Protection

• MSOP-8 and 3mm x 3mm VSON-8 Packages

APPLICATIONS

• Low Power Standby or Bias Voltage Supplies

• 4-20 mA Current-Loop Powered Sensors

• Industrial Process Control, Metering, and

Security Systems

• High Voltage Linear Regulator Replacement

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SIMPLIFIED SCHEMATIC EFFICIENCY

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.

2SwitcherPro 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 (37 pages)

PAGE 1
TPS54062 www.ti.com SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 4.7V to 60V Input, 50mA Synchronous Step-Down Converter with Low IQ Check for Samples: TPS54062 FEATURES DESCRIPTION • • • The TPS54062 device is a 60 V, 50-mA, synchronous step-down converter with integrated high side and low side MOSFETs. Current mode control provides simple external compensation and flexible component selection. The non-switching supply current is 89 µA. Using the enable pin, shutdown supply current is reduced to 1.7 µA.
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TPS54062 SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 www.ti.com These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. Table 1.
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TPS54062 www.ti.
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TPS54062 SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 www.ti.com ABSOLUTE MAXIMUM RATINGS (1) over operating free-air temperature range (unless otherwise noted) VALUE MAX VIN –0.3 62 V EN –0.3 8 V 8 V PH-BOOT BOOT Voltage 70 V VSENSE –0.3 6 V COMP –0.3 3 V PH –0.6 62 V –2 62 V –0.
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TPS54062 www.ti.com SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 ELECTRICAL CHARACTERISTICS (1) TEST CONDITIONS: TJ = –40°C to 125°C, VIN = 4.7 To 60 V ( (unless otherwise noted) PARAMETER CONDITIONS MIN TYP MAX UNIT SUPPLY VOLTAGE (VIN PIN) Operating input voltage VIN Shutdown supply current EN = 0V 4.7 1.7 60 V Iq Operating – Non switching VSENSE = 0.9V, VIN = 12V 89 110 µA 1.24 1.4 V µA ENABLE AND UVLO (EN PIN) Enable threshold Rising 1.14 V Enable threshold +50 mV –4.
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TPS54062 SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 www.ti.com ELECTRICAL CHARACTERISTICS(1) (continued) TEST CONDITIONS: TJ = –40°C to 125°C, VIN = 4.7 To 60 V ( (unless otherwise noted) PARAMETER CONDITIONS MIN TYP MAX UNIT PH Minimum On time Measured at 50% to 50% of VIN IOUT = 50mA 120 ns Dead time VIN = 12V, IOUT = 50mA, One transition 30 ns VIN = 12V 5.7 V 2.9 V 4.
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TPS54062 www.ti.com SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 TYPICAL CHARACTERISTICS SPACER 3.0 1.6 VIN = 4.7V VIN = 12V VIN = 60V 1.2 Resistance (Ω) Resistance (Ω) 2.5 VIN = 4.7V VIN = 12V VIN = 60V 1.4 2.0 1.5 1.0 0.8 0.6 0.4 1.0 0.2 0.5 −50 −25 0 25 50 Temperature (°C) 75 100 0.0 −50 125 −25 Figure 1. High Side RDS(on) vs Temperature 87.5 0.804 75.0 % of Normal Fsw Voltage Reference (V) 0.806 0.802 0.800 0.798 125 G002 50.0 37.5 25.0 0.794 12.
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TPS54062 SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 www.ti.com TYPICAL CHARACTERISTICS (continued) 140 1.26 120 1.24 100 1.22 Enable Voltage (V) Transconductance (µA) VIN = 12V 80 60 40 20 VIN = 12V 1.20 1.16 1.14 0 −50 −25 0 25 50 Temperature (°C) 75 100 1.12 −50 125 −25 0 25 50 75 Junction Temperature (°C) G007 Figure 7. Error Amp Transconductance vs Temperature 100 125 G013 Figure 8. Enable Pin Voltage vs Temperature −3.20 4.50 VIN = 12V −3.25 4.45 −3.30 4.
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TPS54062 www.ti.com SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 TYPICAL CHARACTERISTICS (continued) 98 2.50 Non−Switching TJ = 125°C TJ = 25°C TJ = −40°C 2.25 96 Supply Current (µA) Supply Current (µA) 2.00 94 92 90 88 TJ = 125°C TJ = −40°C TJ = 25°C 86 84 0 5 10 15 20 25 30 35 40 Input Voltage (V) 45 50 55 1.75 1.50 1.25 1.00 0.75 0.50 0.25 0.00 60 0 Figure 13. Supply Current (VIN pin) vs Input Voltage 2 3 Input Voltage (V) 4 5 G011 Figure 14.
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TPS54062 SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 www.ti.com OVERVIEW The TPS54062 device is a 60 V, 50 mA, step-down (buck) regulator with an integrated high side and low side nchannel MOSFET. To improve performance during line and load transients the device implements a constant frequency, current mode control which reduces output capacitance and simplifies external frequency compensation design.
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TPS54062 www.ti.com SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 DETAILED DESCRIPTION Fixed Frequency PWM Control The TPS54062 uses an adjustable fixed frequency, peak current mode control. The output voltage is compared through external resistors on the VSENSE pin to an internal voltage reference by an error amplifier which drives the COMP pin. An internal oscillator initiates the turn on of the high side power switch. The error amplifier output is compared to the high side power switch current.
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TPS54062 SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 www.ti.com VIN TPS54062 i1 ihys RUVLO1 EN Optional RUVLO2 VEN Figure 18.
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TPS54062 www.ti.
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TPS54062 SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 www.ti.com Overvoltage Transient Protection The TPS54062 incorporates an overvoltage transient protection (OVTP) circuit to minimize voltage overshoot when recovering from output fault conditions or strong unload transients on power supply designs with low value output capacitance. For example, when the power supply output is overloaded the error amplifier compares the actual output voltage to the internal reference voltage.
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TPS54062 www.ti.com SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 Selecting the Switching Frequency The first step is to decide on a switching frequency for the regulator. Typically, the user will want to choose the highest switching frequency possible since this will produce the smallest solution size. The high switching frequency allows for lower valued inductors and smaller output capacitors compared to a power supply that switches at a lower frequency.
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TPS54062 SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 www.ti.com Output Capacitor There are three primary considerations for selecting the value of the output capacitor. The output capacitor will determine the modulator pole, the output voltage ripple, and how the regulator responds to a large change in load current. The output capacitance needs to be selected based on the more stringent of these three criteria. The desired response to a large change in the load current is the first criteria.
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TPS54062 www.ti.com SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 CO 2 ³ LO ´ (I O (VO 2 - 02 ) 2 + DV ) - VO2 (13) I 2 CO 3 ³ O DV fSW RC (14) V £ RIPPLE IRIPPLE (15) Input capacitor The TPS54062 requires a high quality ceramic, type X5R or X7R, input decoupling capacitor of at least 1µF of effective capacitance and in some applications a bulk capacitance. The effective capacitance includes any dc bias effects.
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TPS54062 SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 www.ti.com Closing the Loop There are several methods used to compensate DC/DC regulators. The method presented here is easy to calculate and ignores the effects of the slope compensation that is internal to the device. Since the slope compensation is ignored, the actual cross over frequency will usually be lower than the cross over frequency used in the calculations.
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TPS54062 www.ti.com SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 Characteristics SPACER 100 100 VOUT = 3.3V fSW = 400kHz 80 80 70 70 60 50 40 VIN = 10V VIN = 24V VIN = 36V VIN = 48V VIN = 60V 30 20 10 0 0 0.01 0.02 0.03 Output Current (A) 0.04 100 1000 10000 Frequency (Hz) 40 VIN = 10V VIN = 24V VIN = 36V VIN = 48V VIN = 60V 20 10 0 0.001 0.05 0.01 Output Current (A) 100000 IOUT = 25mA 0.08 0.06 0.04 0.02 0.00 −0.02 −0.04 −0.06 −0.08 −0.10 G031 Figure 23. Gain vs Phase G041 0.
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TPS54062 SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 www.ti.com VOUT = 100 mV / div (ac coupled) VOUT = 50 mV / div (ac coupled) VIN = 10 V / div IOUT = 20 mA / div Time = 1 msec / div Time = 20 msec / div Figure 26. Load Transient Figure 27. Line Transient VIN = 10 V / div VIN = 10 V / div EN = 2 V / div EN = 2 V / div VOUT = 2 V / div 20 VOUT = 2 V / div Time = 2 msec / div Time = 2 msec / div Figure 28. Startup with ENA Figure 29.
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TPS54062 www.ti.com SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 VIN = 10 mV / div (ac coupled) VOUT = 10 mV / div (ac coupled) PH = 20 V / div PH = 20 V / div Inductor Current = 100 mA / div Inductor Current = 100 mA / div Time = 2 µsec / div Time = 50 µsec / div Figure 32. Input Ripple Skip VOUT = 10 mV / div (ac coupled) Figure 33.
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TPS54062 SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 www.ti.com DESIGN GUIDE – STEP-BY-STEP PROCEDURE Number 2 Figure 36. DCM Application Schematic For Designing an Efficient, Low Output Current Power Supply at a Fixed Switching Frequency This example details the design of a low output current, fixed switching regulator design using ceramic output capacitors. A few parameters must be known in order to start the design process. These parameters are typically determined at the system level.
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TPS54062 www.ti.com SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 Use Equation 28, to make sure the minimum current limit on the high side power switch is not exceeded at the maximum output current. The peak current is calculated as 23.9mA and is lower than the 134 mA current limit. To determine the rms current for the inductor and output capacitor, it is necessary to calculate the duty cycle. The duty cycle, D1, for a step down regulator in DCM is calculated in Equation 29.
PAGE 24
TPS54062 SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 www.ti.com Closing the Feedback Loop The method presented here is easy to calculate and includes the effect of the slope compensation that is internal to the device. This method assumes the crossover frequency is between the modulator pole and the esr zero and the esr zero is at least 10 times greater the modulator pole. Once the output components are determined, use the equations below to close the feedback loop.
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TPS54062 www.ti.com SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 Characteristics SPACER 100 100 VOUT =3.3V 90 80 80 70 70 Efficiency (%) Efficiency (%) 90 60 50 40 30 10 0 10 0 0.005 0.01 0.015 0.02 0.025 0.03 0.035 0.04 0.045 0.05 Output Current (A) G020 180 0.5 135 0.4 20 90 10 45 0 0 −10 −45 −20 −90 Gain Phase −30 10 Output Voltage Normalized (%) VIN = 24V IOUT = 5ma 30 −135 100 1000 Frequency (Hz) −180 100000 10000 VIN = 10V VIN = 24V VIN = 40 VOUT = 5V 0 0.005 0.
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TPS54062 SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 26 www.ti.com Figure 43. Unload Transient Figure 44. Startup With ENA Figure 45. Startup With VIN Figure 46. Prebias Startup With ENA Figure 47. Prebias Startup With VIN Figure 48.
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TPS54062 www.ti.com SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 Figure 49. Input and Output Ripple in CCM Layout Layout is a critical portion of good power supply design. There are several signals paths that conduct fast changing currents or voltages that can interact with stray inductance or parasitic capacitance to generate noise or degrade the power supplies performance.
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TPS54062 SLVSAV1B – MAY 2011 – REVISED AUGUST 2012 www.ti.com REVISION HISTORY Changes from Original (May 2011) to Revision A Page • Changed Features Item From: MSOP8 and WSON8 Packages To: MSOP-8 and 3 mm x 3 mm VSON-8 Packages ....... 1 • Changed the Efficiency Graph .............................................................................................................................................. 1 • Added the ORDERING INFORMATION table .................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 16-Aug-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 TPS54062DGKR VSSOP DGK 8 2500 330.0 12.4 5.3 3.3 1.3 8.0 12.0 Q1 TPS54062DRBR SON DRB 8 3000 330.0 12.4 3.3 3.3 1.1 8.0 12.0 Q2 TPS54062DRBT SON DRB 8 250 180.0 12.4 3.3 3.3 1.1 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 16-Aug-2012 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS54062DGKR VSSOP DGK 8 2500 370.0 355.0 55.0 TPS54062DRBR SON DRB 8 3000 367.0 367.0 35.0 TPS54062DRBT SON DRB 8 250 210.0 185.0 35.
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