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LMZ10503EXT

www.ti.com

SNVS668G –JUNE 2010–REVISED OCTOBER 2013

3A SIMPLE SWITCHER® Power Module with 5.5V Maximum Input Voltage for Military and

Rugged Applications

Check for Samples: LMZ10503EXT

FEATURES

ELECTRICAL SPECIFICATIONS

• Integrated Shielded Inductor

• 15W Maximum Total Output Power

• Flexible Startup Sequencing Using External

• Up to 3A Output Current

Soft-Start, Tracking, and Precision Enable

• Input Voltage Range 2.95V to 5.5V

• Protection Against In-Rush Currents and

• Output Voltage Range 0.8V to 5V

Faults Such as Input UVLO and Output Short-

Circuit

• ±1.63% Feedback Voltage Accuracy Over

Temperature

• -55°C to +125°C Junction Temperature

Operating Range

• Efficiency up to 96%

• Single Exposed Pad and Standard Pinout for

APPLICATIONS

Easy Mounting and Manufacturing

• Pin-to-Pin Compatible With

• Point-of-Load Conversions From 3.3V and 5V

Rails

– LMZ10504EXT (4A/20W max)

• Space Constrained Applications

– LMZ10505EXT (5A/25W max)

• Extreme Temperatures/No Air Flow

• Fully Enable for WEBENCH

and Power

Environments

Designer

• Noise Sensitive Applications (i.e. Transceiver,

• Low Output Voltage Ripple of 10 mV Allows

Medical)

for Powering Noise-Sensitive Transceiver and

Signaling ICs

PERFORMANCE BENEFITS

• Fast Transient Response for Powering FPGAs

and ASICs

• Operates at High Ambient Temperatures

• Low Radiated Emissions (EMI) Complies With

Easy to Use 7 Pin Package

EN55022 Class B Standard

(2)

• Passes 10V/m Radiated Immunity EMI Test

Standard EN61000 4-3

• Passes Vibration Standard

– MIL-STD-883 Method 2007.2 Condition A

– JESD22-B103B Condition 1

• Passes Drop Standard

Easy to use PFM 7 Pin Package

– MIL-STD-883 Method 2002.3 Condition B

10.16 x 13.77 x 4.57 mm (0.4 x 0.39 x 0.18 in)

= 20°C/W, θ

= 1.9°C/W

(1)

– JESD22-B110 Condition B

RoHS Compliant

Peak Reflow Case Temp = 245°C

Power Module SMT Guidelines

(1) θ

measured on a 2.25” x 2.25” (5.8 cm x 5.8 cm) four layer

board. Refer to PCB Layout Diagrams or Evaluation Board (2) EN 55022:2006, +A1:2007, FCC Part 15 Subpart B: 2007.

Application Note: AN-2074 (SNVA450). See Figure 21 and layout for information on device under test.

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.

2WEBENCH, SIMPLE SWITCHER are registered trademarks of Texas Instruments.

3All other 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 (33 pages)

PAGE 1
LMZ10503EXT www.ti.com SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 3A SIMPLE SWITCHER® Power Module with 5.
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LMZ10503EXT SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com DESCRIPTION The LMZ10503EXT SIMPLE SWITCHER® power module is a complete, easy-to-use DC-DC solution capable of driving up to a 3A load with exceptional power conversion efficiency, output voltage accuracy, line and load regulation. The LMZ10503EXT is available in an innovative package that enhances thermal performance and allows for hand or machine soldering. The LMZ10503EXT can accept an input voltage rail between 2.95V and 5.
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LMZ10503EXT www.ti.com SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 Radiated Emissions (EN 55022, Class B) Figure 3. Typical Application Circuit VIN VOUT 1 LMZ10503EXT VIN Cin 2 FB EN SS VOUT 6, 7 CO 5 GND 4, EP 3 Rfbt CSS Rcomp Ccomp Rfbb Connection Diagram Exposed Pad Connect to GND 7 VOUT 6 VOUT 5 FB 4 GND 3 SS 2 EN 1 VIN Figure 4.
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LMZ10503EXT SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com PIN DESCRIPTIONS Pin Number Name 1 VIN A low ESR input capacitance should be located as close as possible to VIN pin and GND pin. 2 EN Active high enable input for the device. 3 SS Soft-start control pin. An internal 2 uA current source charges and external capacitor connected between this pin and GND (pin 4) to set the output voltage ramp rate during startup. This pin can also be used to configure the tracking feature.
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LMZ10503EXT www.ti.com SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 Electrical Characteristics Specifications with standard typeface are for TJ = 25°C only; limits in bold face type apply over the operating junction temperature range TJ of -55°C to 125°C. Minimum and maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. VIN = VEN = 3.
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LMZ10503EXT SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com Electrical Characteristics (continued) Specifications with standard typeface are for TJ = 25°C only; limits in bold face type apply over the operating junction temperature range TJ of -55°C to 125°C. Minimum and maximum limits are specified through test, design, or statistical correlation. Typical values represent the most likely parametric norm at TJ = 25°C, and are provided for reference purposes only. VIN = VEN = 3.
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LMZ10503EXT www.ti.com SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 Typical Performance Characteristics Unless otherwise specified, the following conditions apply: VIN = VEN = 5.0V, CIN is 47 µF 10V X5R ceramic capacitor; TAMBIENT = 25°C for efficiency curves and waveforms. Load Transient Response VIN = 3.3V, VOUT = 2.5V, IOUT = 0.3A to 2.7A to 0.3A step 20 MHz Bandwidth Limited Refer to Table 5 for BOM, includes optional components Load Transient Response VIN = 5.0V, VOUT = 2.5V, IOUT = 0.3A to 2.
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LMZ10503EXT SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified, the following conditions apply: VIN = VEN = 5.0V, CIN is 47 µF 10V X5R ceramic capacitor; TAMBIENT = 25°C for efficiency curves and waveforms. 8 Efficiency VOUT = 1.8V Efficiency VOUT = 1.5V Figure 11. Figure 12. Efficiency VOUT = 1.2V Efficiency VOUT = 0.8V Figure 13. Figure 14. Current Derating VIN = 5V, θJA = 20°C / W Current Derating VIN = 3.
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LMZ10503EXT www.ti.com SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 Typical Performance Characteristics (continued) Unless otherwise specified, the following conditions apply: VIN = VEN = 5.0V, CIN is 47 µF 10V X5R ceramic capacitor; TAMBIENT = 25°C for efficiency curves and waveforms. Radiated Emissions (EN55022, Class B) VIN = 5V, VOUT = 2.5V, IOUT = 3A Evaluation board Startup VOUT = 2.5V, IOUT = 0A Figure 17. Figure 18. Pre-biased Startup VOUT = 2.5V, IOUT = 0A Figure 19.
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LMZ10503EXT SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com BLOCK DIAGRAM VIN 1 1: SS Drivers Voltage Mode Control 3 5 2.2 PF 2.2 PH 6, 7 VOUT N-MOSFET 2 EN P-MOSFET 2.2 PF 4, EP FB GND DESIGN GUIDELINE AND OPERATING DESCRIPTION Design Steps LMZ10503EXT is fully supported by Webench® and offers the following: component selection, performance, electrical, and thermal simulations as well as the Build-It board, for a reduced design time.
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LMZ10503EXT www.ti.com SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 Neglecting capacitor equivalent series resistance (ESR), the resultant input capacitor AC ripple voltage is a triangular waveform. The minimum input capacitance for a given peak-to-peak value (ΔVIN) of VIN is specified as follows: Cin 8 IOUT x D x (1 - D) fSW x 'VIN (1) where the PWM duty cycle, D, is given by: VOUT D= VIN (2) If ΔVIN is 1% of VIN, this equals to 50 mV and fSW = 1 MHz 2.5V ) x (1 - 2.
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LMZ10503EXT SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com CO t PF (10) Three miliohms is a typical RESR value for ceramic capacitors. The following equation provides a good first pass capacitance requirement for a load transient: Istep x VFB x L x VIN CO t 4 x VOUT x (VIN - VOUT) x 'Vo_tran (11) Where Istep is the peak to peak load step (for this example Istep = 10% to 90% of the maximum load), VFB = 0.8V, and ΔVo_tran is the maximum output voltage deviation, which is ±20 mV.
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LMZ10503EXT www.ti.com SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 kHz. Calculated output capacitance values not listed in Table 2 should be verified before designing into production. A detailed application note is available to provide verification support, AN-2013 SNVA419. In general, calculated output capacitance values below the suggested value will have reduced phase margin and higher control loop bandwidth.
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LMZ10503EXT SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com Given the typical thermal resistance from junction to case (θJC) to be 1.9°C/W (typ.). Continuously operating at a TJ greater than 125°C will have a shorten life span. To reach θCA = 69.5°C/W, the PCB is required to dissipate heat effectively. With no airflow and no external heat, a good estimate of the required board area covered by 1oz. copper on both the top and bottom metal layers is: Board Area_cm2 8 500 .
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LMZ10503EXT www.ti.com SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 3. Minimize trace length to the FB pin. Both feedback resistors, Rfbt and Rfbb, and the compensation components, Rcomp and Ccomp, should be located close to the FB pin. Since the FB node is high impedance, keep the copper area as small as possible. This is most important as relatively high value resistors are used to set the output voltage. 4. Make input and output bus connections as wide as possible.
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LMZ10503EXT SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com Master Power Supply VOUT1 VIN VOUT2 VIN VOUT Rent LMZ10503EXT Cin1 CO1 EN Renb GND Soft-Start The LMZ10503EXT begins to operate when both the VIN and EN, voltages exceed the rising UVLO and enable thresholds, respectively. A controlled soft-start eliminates inrush currents during startup and allows the user more control and flexibility when sequencing the LMZ10503EXT with other power supplies.
PAGE 17
LMZ10503EXT www.ti.com SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 Tracking - Equal Soft-Start Time One way to use the tracking feature is to design the tracking resistor divider so that the master supply output voltage, VOUT1, and the LMZ10503EXT output voltage, VOUT2, both rise together and reach their target values at the same time. This is termed ratiometric startup. For this case, the equation governing the values of tracking divider resistors Rtrkb and Rtrkt is given by Rtrkt Rtrkb = VOUT1 -1.
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LMZ10503EXT SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com SIMULTANEOUS STARTUP VOUT1 VOLTAGE VOUT2 EN TIME Pre-Bias Startup Capability At startup, the LMZ10503EXT is in a pre-biased state when the output voltage is greater than zero. This often occurs in many multi-rail applications such as when powering an ASIC, FPGA, or DSP. The output can be prebiased in these applications through parasitic conduction paths from one supply rail to another.
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LMZ10503EXT www.ti.com SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 VIN U1 1 2 VOUT VIN EN VOUT 6, 7 CO1 LMZ10503EXT FB Cin1 SS 3 5 GND 4, EP Rfbt CSS Rcomp Ccomp Rfbb Figure 21. Table 3. Bill of Materials, VIN = 3.3V to 5V, VOUT = 2.5V, IOUT (MAX) = 3A, Optimized for Electrolytic Input and Output Capacitance Designator Description Case Size Manufacturer Manufacturer P/N Quantity U1 SIMPLE SWITCHER ® PFM-7 Texas Instruments LMZ10503EXTTZ 1 Cin1 150 µF, 6.3V, 18 mΩ C2, 6.0 x 3.
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LMZ10503EXT SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com U1 Optional VIN 1 VIN 2 Cin2 + VOUT EN CO1 LMZ10503EXT Cin1 FB Ccomp 5 CO2 CO3 Rfbt GND 4, EP SS 3 VOUT 6, 7 Rcomp CSS Optional Rfbb Figure 22. Table 5. Bill of Materials, VIN = 3.3V to 5V, VOUT = 2.
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LMZ10503EXT www.ti.com SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 U1 VIN 1 + Cin4 Cin3 Cin2 Cin1 VOUT 6, 7 CO1 LMZ10503EXT Ren1 Cin5 VOUT VIN 2 FB EN GND 4, EP SS 3 CO2 CO3 5 Rfbt CSS Ccomp Rcomp Rfbb Figure 23. Table 7. Bill of Materials for Evaluation Board, VIN = 3.3V to 5V, VOUT = 2.
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LMZ10503EXT SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com U1 VIN 1 VOUT VIN VOUT 6, 7 CO1 LMZ10503EXT Cin3 Cin2 Cin1 2 FB EN 5 GND 4, EP SS 3 Rfbt CSS Ccomp Rcomp Rfbb Figure 24. Table 9. Bill of Materials, VIN = 5V, VOUT = 2.
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LMZ10503EXT www.ti.com SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 PCB Layout Diagrams The PCB design is available in the LMZ10503EXT product folder at http://www.ti.com/product/lmz10503ext. Figure 25.
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LMZ10503EXT SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com Figure 26. Internal Layer 1 (Ground) Figure 27.
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LMZ10503EXT www.ti.com SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 Figure 28.
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LMZ10503EXT SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com Figure 29. Sample Reflow Profile Table 11. 26 Probe Max Temp (°C) Reached Max Temp Time Above 235°C Reached 235°C Time Above 245°C Reached 245°C Time Above 260°C Reached 260°C #1 242.5 6.58 0.49 6.39 0.00 – 0.00 – #2 242.5 7.10 0.55 6.31 0.00 7.10 0.00 – #3 241.0 7.09 0.42 6.44 0.00 – 0.
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LMZ10503EXT www.ti.com SNVS668G – JUNE 2010 – REVISED OCTOBER 2013 REVISION HISTORY Changes from Revision F (April 2013) to Revision G Page • Added Peak Reflow Case Temp = 245°C ............................................................................................................................ 1 • Changed 10mils ..................................................................................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE OPTION ADDENDUM www.ti.com 13-Sep-2014 continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.
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PACKAGE MATERIALS INFORMATION www.ti.com 1-Oct-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) W Pin1 (mm) Quadrant LMZ10503EXTTZ/NOPB TOPMOD NDW 7 250 330.0 24.4 10.6 14.22 5.0 16.0 24.0 Q2 LMZ10503EXTTZX/NOPB TOPMOD NDW 7 500 330.0 24.4 10.6 14.22 5.0 16.0 24.
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PACKAGE MATERIALS INFORMATION www.ti.com 1-Oct-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMZ10503EXTTZ/NOPB TO-PMOD NDW 7 250 367.0 367.0 45.0 LMZ10503EXTTZX/NOPB TO-PMOD NDW 7 500 367.0 367.0 45.
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MECHANICAL DATA NDW0007A BOTTOM SIDE OF PACKAGE TOP SIDE OF PACKAGE TZA07A (Rev D) www.ti.
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