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LMZ12003EXT

www.ti.com

SNVS663G –JUNE 2010–REVISED OCTOBER 2013

LMZ12003EXT 3A SIMPLE SWITCHER® Power Module with 20V Maximum Input Voltage

for Military and Rugged Applications

Check for Samples: LMZ12003EXT

FEATURES

DESCRIPTION

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

The LMZ12003EXT SIMPLE SWITCHER power

• Integrated Shielded Inductor

module is an easy-to-use step-down DC-DC solution

capable of driving up to 3A load with exceptional

• Simple PCB Layout

power conversion efficiency, line and load regulation,

• Flexible Startup Sequencing Using External

and output accuracy. The LMZ12003EXT is available

Soft-Start Capacitor and Precision Enable

in an innovative package that enhances thermal

• Protection Against Inrush Currents and Faults

performance and allows for hand or machine

such as Input UVLO and Output Short Circuit

soldering.

• Single Exposed Pad and Standard Pinout for

The LMZ12003EXT can accept an input voltage rail

Easy Mounting and Manufacturing

between 4.5V and 20V and deliver an adjustable and

highly accurate output voltage as low as 0.8V. The

• Fast Transient Response for FPGAs and

LMZ12003EXT only requires three external resistors

ASICs

and four external capacitors to complete the power

• Low Output Voltage Ripple

solution. The LMZ12003EXT is a reliable and robust

• Pin-to-Pin Compatible Family:

design with the following protection features: thermal

shutdown, input under-voltage lockout, output over-

– LMZ14203EXT/2EXT/1EXT

voltage protection, short-circuit protection, output

(42V Max 3A, 2A, 1A)

current limit, and allows startup into a pre-biased

– LMZ14203/2/1 (42V Max 3A, 2A, 1A)

output. A single resistor adjusts the switching

– LMZ12003/2/1 (20V Max 3A, 2A, 1A)

frequency up to 1 MHz.

• Fully Webench® Power Designer Enabled

ELECTRICAL SPECIFICATIONS

APPLICATIONS

• 18W Maximum Total Power Output

• Point of Load Conversions from 5V and 12V

• Up to 3A Output Current

Input Rail

• Input Voltage Range 4.5V to 20V

• Time Critical Projects

• Output Voltage Range 0.8V to 6V

• Space Constrained High Thermal Requirement

• Efficiency up to 92%

Applications

• Negative Output Voltage Applications (See AN-

PERFORMANCE BENEFITS

2027 SNVA425)

• Low Radiated Emissions / High Radiated

Immunity

• Passes Vibration Standard MIL-STD-883

Method 2007.2 Condition A JESD22–B103B

Condition 1

• Passes Drop Standard MIL-STD-883 Method

2002.3 Condition B JESD22–B110 Condition B

Figure 1. Easy To Use PFM 7 Pin Package

10.16 x 13.77 x 4.57 mm (0.4 x 0.542 x 0.18 in)

= 20°C/W, θ

= 1.9°C/W

RoHS Compliant

Peak Reflow Case Temp = 245° C

Power Module SMT Guidelines

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 (25 pages)

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LMZ12003EXT www.ti.
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LMZ12003EXT SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com System Performance Figure 2. Efficiency VIN = 12V VOUT = 5.0V Figure 3. Thermal Derating Curve VIN = 12V VOUT = 5.0V Figure 4.
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LMZ12003EXT www.ti.com SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 Simplified Application Schematic VOUT FB SS GND EN VIN VIN RON LMZ12003EXT VOUT @ 3A CFF RON RFBT Enable CIN CSS COUT RFBB Connection Diagram Figure 5. Top View - 7-Lead PFM PIN DESCRIPTIONS Pin Name Description 1 VIN Supply input — Nominal operating range is 4.5V to 20V . A small amount of internal capacitance is contained within the package assembly.
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LMZ12003EXT SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com Absolute Maximum Ratings (1) VIN, RON to GND -0.3V to 25V EN, FB, SS to GND -0.3V to 7V Junction Temperature 150°C Storage Temperature Range -65°C to 150°C ESD Susceptibility (2) ± 2 kV Peak Reflow Case Temperature (30 sec) 245°C For soldering specifications, refer to the following document: www.ti.com/lit/snoa549c (1) (2) Absolute Maximum Ratings are limits beyond which damage to the device may occur.
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LMZ12003EXT www.ti.com SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 Electrical Characteristics Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -55°C to +125°C. Minimum and Maximum limits are ensured 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.
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LMZ12003EXT SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com Typical Performance Characteristics Unless otherwise specified, the following conditions apply: VIN = 12V; Cin = 10uF X7R Ceramic; CO = 100uF X7R Ceramic; Tambient = 25 C for efficiency curves and waveforms. Efficiency 6V Input @ 25°C Dissipation 6V Input @ 25°C Figure 6. Figure 7. Efficiency 12V Input @ 25°C Dissipation 12V Input @ 25°C 100 2.5 95 2 5.0 3.3 2.5 85 80 DISSIPATION (W) EFFICIENCY (%) 90 1.8 1.5 1.2 75 70 0.
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LMZ12003EXT www.ti.com SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 Typical Performance Characteristics (continued) Unless otherwise specified, the following conditions apply: VIN = 12V; Cin = 10uF X7R Ceramic; CO = 100uF X7R Ceramic; Tambient = 25 C for efficiency curves and waveforms. Efficiency 8V Input @ 85°C 100 Dissipation 8V Input @ 85°C 3 95 85 5.0 80 3.3 2.5 75 DISSIPATION (W) EFFICIENCY (%) 5.0 2.5 90 1.8 1.5 70 1.2 65 60 0.8 3.3 2.5 2 1.8 1.5 1.5 1.2 1 0.8 0.
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LMZ12003EXT SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified, the following conditions apply: VIN = 12V; Cin = 10uF X7R Ceramic; CO = 100uF X7R Ceramic; Tambient = 25 C for efficiency curves and waveforms. Output Ripple 12VIN 3.3VO 3A 20mV/div 1μSec/div Line and Load Regulation @ –55°C OUTPUT VOLTAGE (V) 1.81 6 8 1.80 5 5.5 12 15 4.5 20 -55°C 1.79 0 0.5 1.5 1 2 2.5 3 OUTPUT CURRENT (A) Figure . Figure 18.
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LMZ12003EXT www.ti.com SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 Typical Performance Characteristics (continued) Unless otherwise specified, the following conditions apply: VIN = 12V; Cin = 10uF X7R Ceramic; CO = 100uF X7R Ceramic; Tambient = 25 C for efficiency curves and waveforms. Current Limit 1.8VOUT @ -55°C 5 OUTPUT CURRENT (A) SHORT CIRCUIT 4.5 4 ONSET 3.5 85C 3 0 5 10 15 20 25 INPUT VOLTAGE (V) Figure 23.
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LMZ12003EXT SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com APPLICATION BLOCK DIAGRAM Vin VIN 1 Linear reg Cvcc 5 CIN SS Css CBST 3 EN RON 2 VOUT 7 RON Timer CFF 6 6.8 éH VO Co FB RFBT RFBB 0.47 éF Regulator IC Internal Passives GND 4 COT Control Circuit Overview Constant On Time control is based on a comparator and an on-time one shot, with the output voltage feedback compared with an internal 0.8V reference.
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LMZ12003EXT www.ti.com SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 The LMZ12003EXT demonstration and evaluation boards use 11.8kΩ for RENB and 32.4kΩ for RENT resulting in a rising UVLO of 4.5V. This divider presents 5.34V to the EN input when the divider input is raised to 20V. OUTPUT VOLTAGE SELECTION Output voltage is determined by a divider of two resistors connected between VO and ground. The midpoint of the divider is connected to the FB input. The voltage at FB is compared to a 0.
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LMZ12003EXT SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com CO≥ISTEP*VFB*L*VIN/ (4*VO*(VIN—VO)*VOUT-TRAN) (4) Solving: CO ≥ 3A*0.8V*6.8μH*12V / (4*3.3V*( 12V — 3.3V)*33mV) ≥ 52μF The LMZ12003EXT demonstration and evaluation boards are populated with a 100 uF 6.3V X5R output capacitor. Locations for extra output capacitors are provided. CIN SELECTION The LMZ12003EXT module contains an internal 0.47 µF input ceramic capacitor.
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LMZ12003EXT www.ti.com SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 This equation can be used to select RON if a certain operating frequency is desired so long as the minimum ontime of 150 ns is observed. The limit for RON can be calculated as follows: RON ≥ VIN(MAX) * 150 nsec / (1.3 * 10 -10) (11) If RON calculated in Equation 8 is less than the minimum value determined in Equation 11 a lower frequency should be selected.
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LMZ12003EXT SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com The inductor internal to the module is 6.8 μH. This value was chosen as a good balance between low and high input voltage applications. The main parameter affected by the inductor is the amplitude of the inductor ripple current (ILR). ILR can be calculated with: ILR P-P=VO*(VIN- VO)/(6.8µH*fSW*VIN) (14) Where VIN is the maximum input voltage and fSW is determined from Equation 7.
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LMZ12003EXT www.ti.com SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 3. Minimize trace length to the FB pin. Both feedback resistors, RFBT and RFBB, and the feed forward capacitor CFF, should be located close to the FB pin. Since the FB node is high impedance, maintain the copper area as small as possible. The trace are from RFBT, RFBB, and CFF should be routed away from the body of the LMZ12003EXT to minimize noise. 4. Make input and output bus connections as wide as possible.
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LMZ12003EXT SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com PRE-BIASED STARTUP The LMZ12003EXT will properly start up into a pre-biased output. This startup situation is common in multiple rail logic applications where current paths may exist between different power rails during the startup sequence. The following scope capture shows proper behavior during this event. Figure 26. Pre-Biased Startup Evaluation Board Schematic Diagram U1 EP Enable VIN VOUT FB 1.
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LMZ12003EXT www.ti.com SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 Ref Des Description Case Size Manufacturer Manufacturer P/N U1 SIMPLE SWITCHER ® PFM-7 Texas Instruments LMZ12003EXTTZ-ADJ Cin1 1 µF, 50V, X7R 1206 Taiyo Yuden UMK316B7105KL-T Cin2 10 µF, 50V, X7R 1210 Taiyo Yuden UMK325BJ106MM-T CO1 1 µF, 50V, X7R 1206 Taiyo Yuden UMK316B7105KL-T CO2 100 µF, 6.3V, X7R 1210 Taiyo Yuden JMK325BJ10CR7MM-T RFBT 1.37 kΩ 0603 Vishay Dale CRCW06031K37FKEA RFBB 1.
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LMZ12003EXT SNVS663G – JUNE 2010 – REVISED OCTOBER 2013 www.ti.
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LMZ12003EXT www.ti.com SNVS663G – 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 • Deleted 12mils ......................................................................................................................................................................
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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 24-Sep-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 LMZ12003EXTTZ/NOPB TOPMOD NDW 7 250 330.0 24.4 10.6 14.22 5.0 16.0 24.0 Q2 LMZ12003EXTTZX/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 24-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMZ12003EXTTZ/NOPB TO-PMOD NDW 7 250 367.0 367.0 45.0 LMZ12003EXTTZX/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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