Datasheet

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PVIN

AGND

PGOOD

SS/TRK

AVIN

COMP

LM20134

VCC

PGND

VCC

OUT

FB2

FB1

(optional)

SYNC

LM20134, LM20134Q

www.ti.com

SNVS527G –OCTOBER 2007–REVISED MARCH 2013

LM20134/LM20134Q 4A, PowerWise® Synchronous Buck Regulator with Input

Synchronization

Check for Samples: LM20134, LM20134Q

FEATURES

DESCRIPTION

The LM20134 is a full featured synchronous buck

• LM20134Q is AEC-Q100 Qualified and

regulator capable of delivering up to 4A of continuous

Manufactured on an Automotive Grade Flow

output current. The current mode control loop can be

• Input Voltage Range 2.95V to 5.5V

compensated to be stable with virtually any type of

• Accurate Current Limit Minimizes Inductor

output capacitor. For most cases, compensating the

device only requires two external components,

Size

providing maximum flexibility and ease of use. The

• 97% Peak Efficiency

device is optimized to work over the input voltage

• Frequency Synchronization Pin

range of 2.95V to 5.5V making it suited for a wide

• 32 mΩ Integrated FET Switches

variety of low voltage systems.

• Starts up into Pre-Biased Loads

The device features internal over voltage protection

(OVP) and over current protection (OCP) circuits for

• Output Voltage Tracking

increased system reliability. A precision enable pin

• Peak Current Mode Control

and integrated UVLO allows the turn on of the device

• Adjustable Output Voltage Down to 0.8V

to be tightly controlled and sequenced. Start-up

• Adjustable Soft-Start with External Capacitor

inrush currents are limited by both an internally fixed

and externally adjustable Soft-Start circuit. Fault

• Precision Enable Pin with Hysteresis

detection and supply sequencing is possible with the

• Integrated OVP, UVLO, Power Good and

integrated power good circuit.

Thermal Shutdown

The switching frequency of the LM20134 can be

• HTSSOP 16-Pin Exposed Pad Package

synchronized to an external clock by use of the

SYNC pin. The SYNC pin is capable of synchronizing

APPLICATIONS

to input signals ranging from 500 kHz to 1.5 MHz

• Simple to Design, High Efficiency Point of

The LM20134 is designed to work well in multi-rail

Load Regulation from a 5V or 3.3V Bus

power supply architectures. The output voltage of the

• High Performance DSPs, FPGAs, ASICs and

device can be configured to track a higher voltage rail

using the SS/TRK pin. If the output of the LM20134 is

Microprocessors

pre-biased at startup it will not sink current to pull the

• Broadband, Networking and Optical

output low until the internal soft-start ramp exceeds

Communications Infrastructure

the voltage at the feedback pin.

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.

2All trademarks are the property of their respective owners.

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 (31 pages)

PAGE 1
LM20134, LM20134Q www.ti.com SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 LM20134/LM20134Q 4A, PowerWise® Synchronous Buck Regulator with Input Synchronization Check for Samples: LM20134, LM20134Q FEATURES DESCRIPTION • The LM20134 is a full featured synchronous buck regulator capable of delivering up to 4A of continuous output current. The current mode control loop can be compensated to be stable with virtually any type of output capacitor.
PAGE 2
LM20134, LM20134Q SNVS527G – OCTOBER 2007 – REVISED MARCH 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.
PAGE 3
LM20134, LM20134Q www.ti.com SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 ABSOLUTE MAXIMUM RATINGS (1) Voltages from the indicated pins to GND AVIN, PVIN, EN, PGOOD, SS/TRK, COMP, FB, SW, SYNC -0.3V to +6V Storage Temperature -65°C to 150°C Junction Temperature 150°C (2) 2.6W Lead Temperature (Soldering, 10 sec) 260°C Power Dissipation Minimum ESD Rating (3) (1) (2) (3) ±2kV Absolute Maximum Ratings indicate limits beyond which damage to the device may occur.
PAGE 4
LM20134, LM20134Q SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 www.ti.com ELECTRICAL CHARACTERISTICS Unless otherwise stated, the following conditions apply: AVIN = PVIN = VIN = 5V. Limits in standard type are for TJ = 25°C only, limits in bold face type apply over the junction temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits are specified by through test, design, or statistical correlation.
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LM20134, LM20134Q www.ti.com SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise specified: CIN = COUT = 100 µF, L = 1.0 µH (Coilcraft MSS1038), VIN = 5V, VOUT = 1.2V, RLOAD = 1.2Ω, fSW = 1 MHz, TA = 25°C for efficiency curves, loop gain plots and waveforms, and TJ = 25°C for all others. Efficiency vs. Load Current (VIN = 5V, fSW = 1 MHz) Efficiency vs. Load Current (VIN = 3.3V, fSW = 1 MHz) Figure 1. Figure 2. Efficiency vs.
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LM20134, LM20134Q SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: CIN = COUT = 100 µF, L = 1.0 µH (Coilcraft MSS1038), VIN = 5V, VOUT = 1.2V, RLOAD = 1.2Ω, fSW = 1 MHz, TA = 25°C for efficiency curves, loop gain plots and waveforms, and TJ = 25°C for all others. 6 Error Amplifier Gain vs. Frequency Line Regulation Figure 7. Figure 8. Load Regulation Feedback Pin Voltage vs. Temperature Figure 9. Figure 10.
PAGE 7
LM20134, LM20134Q www.ti.com SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: CIN = COUT = 100 µF, L = 1.0 µH (Coilcraft MSS1038), VIN = 5V, VOUT = 1.2V, RLOAD = 1.2Ω, fSW = 1 MHz, TA = 25°C for efficiency curves, loop gain plots and waveforms, and TJ = 25°C for all others. Quiescent Current vs. Temperature (Not Switching) Shutdown Current vs. VIN Figure 13. Figure 14. Enable Threshold vs. Temperature UVLO Threshold vs.
PAGE 8
LM20134, LM20134Q SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: CIN = COUT = 100 µF, L = 1.0 µH (Coilcraft MSS1038), VIN = 5V, VOUT = 1.2V, RLOAD = 1.2Ω, fSW = 1 MHz, TA = 25°C for efficiency curves, loop gain plots and waveforms, and TJ = 25°C for all others. 8 Peak Current Limit vs. VIN Load Transient Response Figure 19. Figure 20. Line Transient Response Start-Up (Soft-Start) Figure 21. Figure 22.
PAGE 9
LM20134, LM20134Q www.ti.com SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified: CIN = COUT = 100 µF, L = 1.0 µH (Coilcraft MSS1038), VIN = 5V, VOUT = 1.2V, RLOAD = 1.2Ω, fSW = 1 MHz, TA = 25°C for efficiency curves, loop gain plots and waveforms, and TJ = 25°C for all others. Short Circuit Input Current vs. VIN PGOOD vs. IPGOOD Figure 25. Figure 26.
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LM20134, LM20134Q SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 www.ti.com BLOCK DIAGRAM +2.7V REGULATOR AVIN 2.7V VCC UVLO + - SLOPE COMP PVIN COMP 2.7V CURRENT SENSE + 5 PA DISCHARGE (50 Ps) SS/TRK ERROR AMP gm = 510 Pmho + + FB 6.4A VREF + - 800 mV DISCHARGE CURRENT LIMIT + - PVIN + - 864 mV PWM COMPARATOR OVERVOLTAGE + - PG-L 752 mV UNDERVOLTAGE + - DIODE EMULATION CONTROL LOGIC + - SW PVIN THERMAL PROTECTION EN 1.
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LM20134, LM20134Q www.ti.com SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 OPERATION DESCRIPTION GENERAL The LM20134 switching regulator features all of the functions necessary to implement an efficient low voltage buck regulator using a minimum number of external components. This easy to use regulator features two integrated switches and is capable of supplying up to 4A of continuous output current.
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LM20134, LM20134Q SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 www.ti.com CURRENT LIMIT The precise current limit of the LM20134 is set at the factory to be within 10% over the entire operating temperature range. This enables the device to operate with smaller inductors that have lower saturation currents.
PAGE 13
LM20134, LM20134Q www.ti.com IBOUNDARY = SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 (VIN ± VOUT) x D 2 x L x fSW (1) Several diagrams are shown in Figure 27 illustrating continuous conduction mode (CCM), discontinuous conduction mode, and the boundary condition. It can be seen that in diode emulation mode, whenever the inductor current reaches zero the SW node will become high impedance.
PAGE 14
LM20134, LM20134Q Switchnode Voltage SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 www.ti.com Continuous Conduction Mode (CCM) VIN Time (s) Inductor Current Continuous Conduction Mode (CCM) IAVERAGE Inductor Current Time (s) DCM - CCM Boundary IAVERAGE Switchnode Voltage Time (s) Discontinuous Conduction Mode (DCM) VIN Inductor Current Time (s) Discontinuous Conduction Mode (DCM) IPeak Time (s) Figure 27.
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LM20134, LM20134Q www.ti.com SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 L LM20134 PVIN SW VIN VOUT RFB1 EN RF AVIN CIN FB CF VIN COUT RFB2 RPG SYNC COMP RC1 CC1 x PGOOD VCC SS/TRK PGND GND VPG CVCC CSS Figure 28. Typical Application Circuit The first equation to calculate for any buck converter is duty-cycle.
PAGE 16
LM20134, LM20134Q SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 www.ti.com OUTPUT CAPACITOR SELECTION (COUT) The output capacitor, COUT, filters the inductor ripple current and provides a source of charge for transient load conditions. A wide range of output capacitors may be used with the LM20134 that provide excellent performance. The best performance is typically obtained using ceramic, SP, or OSCON type chemistries.
PAGE 17
LM20134, LM20134Q www.ti.com SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 As indicated by the RMS ripple current equation, highest requirement for RMS current rating occurs at 50% duty cycle. For this case, the RMS ripple current rating of the input capacitor should be greater than half the output current. For best performance, low ESR ceramic capacitors should be placed in parallel with higher capacitance capacitors to provide the best input filtering for the device.
PAGE 18
LM20134, LM20134Q www.ti.com Output Filter Pole, fP(FIL) AM 0 dB Output Filter Zero, fZ(FIL) Complex Double Pole, fP(MOD) Modulator and Output Filter Transfer Function SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 Optional Error Amp Pole, fP2(EA) 0 dB Error Amp Zero, fZ(EA) AEA + AM Compensated Closed Loop Transfer Function Error Amp Pole, fP(EA) 0 dB Complex Double Pole, fP(MOD) fC Error Amplifier Transfer Function GAIN (dB) Error Amp Pole, fP1(EA) AEA fSW/2 FREQUENCY (Hz) Figure 30.
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LM20134, LM20134Q www.ti.com SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 fZ(FIL) = 1 2 x S x COUT x RESR (9) If needed, the value for CC2 should be calculated using the equation shown below.
PAGE 20
LM20134, LM20134Q SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 www.ti.com External Power Supply VOUT1 LM20134 RA VOUT2 EN RB Figure 32. Sequencing LM20134 with Precision Enable The value for resistor RB can be selected by the user to control the current through the divider. Typically this resistor will be selected to be between 10 kΩ and 1 MΩ. Once the value for RB is chosen the resistor RA can be solved using the equation below to set the desired turn-on voltage.
PAGE 21
LM20134, LM20134Q www.ti.com SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 SIMULTANEOUS START UP VOLTAGE VOUT1 VOUT2 §VOUT2 · -1¸¸ x R2 R1 = ¨¨ © 0.8V ¹ VEN VOUT2 < 0.8 x VOUT1 TIME RATIOMETRIC START UP VOUT1 VOLTAGE VOUT2 R1 = ( VOUT1 -1) x R2 VEN TIME Figure 34. Common Start Up Sequences A simultaneous start up is preferred when powering most FPGAs, DSPs, or other microprocessors.
PAGE 22
LM20134, LM20134Q SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 www.ti.com It is important to always keep the operating junction temperature (TJ) below 125°C for reliable operation. If the junction temperature exceeds 160°C the device will cycle in and out of thermal shutdown. If thermal shutdown occurs it is a sign of inadequate heatsinking or excessive power dissipation in the device. Figure 35, shown below, provides a better approximation of the θJA for a given PCB copper area.
PAGE 23
LM20134, LM20134Q www.ti.com SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 5. Make input and output bus connections as wide as possible. This reduces any voltage drops on the input or output of the converter and can improve efficiency. If voltage accuracy at the load is important make sure feedback voltage sense is made at the load. Doing so will correct for voltage drops at the load and provide the best output accuracy. 6. Provide adequate device heatsinking.
PAGE 24
LM20134, LM20134Q SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 www.ti.com Bill of Materials (VIN = 5V, VOUT = 3.3V, IOUTMAX = 4A, FSYNC = 750kHz) Designator Description Part Number Manufacturer Qty U1 Synchronous Buck Regulator LM20134 Texas Instruments 1 CIN 47 µF, 1210, X5R, 6.3V GRM32ER60J476ME20 Murata 1 COUT 47 µF, 1210, X5R, 6.3V GRM32ER60J476ME20 Murata 1 L 1.5 µH, 8.
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LM20134, LM20134Q www.ti.com SNVS527G – OCTOBER 2007 – REVISED MARCH 2013 REVISION HISTORY Changes from Revision F (March 2013) to Revision G • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 7-Oct-2013 In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.
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PACKAGE MATERIALS INFORMATION www.ti.com 7-Jun-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) LM20134MHE/NOPB HTSSOP PWP 16 250 178.0 12.4 LM20134MHX/NOPB HTSSOP PWP 16 2500 330.0 12.4 Pack Materials-Page 1 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 6.95 8.3 1.6 8.0 12.0 Q1 6.95 8.3 1.6 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 7-Jun-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM20134MHE/NOPB HTSSOP PWP LM20134MHX/NOPB HTSSOP PWP 16 250 210.0 185.0 35.0 16 2500 367.0 367.0 35.
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MECHANICAL DATA PWP0016A MXA16A (Rev A) www.ti.
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