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LMZ14202EXT

www.ti.com

SNVS665F –JUNE 2010–REVISED OCTOBER 2013

LMZ14202EXT 2A SIMPLE SWITCHER® Power Module with 42V Maximum Input Voltage

for Military and Rugged Applications

Check for Samples: LMZ14202EXT

FEATURES

DESCRIPTION

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

The LMZ14202EXT SIMPLE SWITCHER® power

• Integrated Shielded Inductor

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

capable of driving up to 2A load with exceptional

• Simple PCB Layout

power conversion efficiency, line and load regulation,

• Flexible Startup Sequencing Using External

and output accuracy. The LMZ14202EXT is available

Soft-Start 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 LMZ14202EXT can accept an input voltage rail

Easy Mounting and Manufacturing

between 6V and 42V and deliver an adjustable and

highly accurate output voltage as low as 0.8V. The

• Fast Transient Response for Powering FPGAs

LMZ14202EXT only requires three external resistors

and ASICs

and four external capacitors to complete the power

• Low Output Voltage Ripple

solution. The LMZ14202EXT 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 Enabled for Webench® Power Designer

ELECTRICAL SPECIFICATIONS

APPLICATIONS

• 12W Maximum Total Output Power

• Point of Load Conversions from 12V and 24V

• Up to 2A Output Current

Input Rail

• Input Voltage Range 6V to 42V

• Time Critical Projects

• Output Voltage Range 0.8V to 6V

• Space Constrained / High Thermal

• Efficiency up to 90%

Requirement 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 (28 pages)

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LMZ14202EXT www.ti.
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LMZ14202EXT SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com System Performance Efficiency VIN = 24V VOUT = 5.0V 100 95 EFFICIENCY (%) 90 85 80 75 70 65 60 55 50 0 0.5 1 1.5 2 OUTPUT CURRENT (A) Thermal Derating Curve VIN = 24V, VOUT = 5.0V, OUTPUT CURRENT (A) 2.5 2 1.5 1 0.5 0 50 60 70 80 90 100 110 120 AMBIENT TEMPERATURE (°C) Radiated Emissions (EN 55022 Class B) from Evaluation Board RADIATED EMISSIONS (dBPV/m) 80.0 70.0 60.0 50.0 EN 55022 CLASS B LIMIT 40.0 30.0 20.0 10.
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LMZ14202EXT www.ti.com SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 Simplified Application Schematic VOUT FB SS GND VIN EN VIN RON LMZ14202EXT VOUT @ 2A CFF RON RFBT Enable COUT RFBB CSS CIN Connection Diagram Exposed Pad Connect to GND 7 6 5 4 3 2 1 VOUT FB SS GND EN RON VIN Figure 2. Top View 7-Lead PFM PIN DESCRIPTIONS Pin Name Description 1 VIN Supply input — Nominal operating range is 6V to 42V . A small amount of internal capacitance is contained within the package assembly.
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LMZ14202EXT SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com Absolute Maximum Ratings (1) VIN, RON to GND -0.3V to 43.5V 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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LMZ14202EXT www.ti.com SNVS665F – 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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LMZ14202EXT SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com Typical Performance Characteristics Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO = 100uF X7R Ceramic; Tambient = 25 C for efficiency curves and waveforms. 100 Efficiency 6V Input @ 25°C Dissipation 6V Input @ 25°C 1.2 95 1.0 2.5 1.8 1.5 1.2 85 80 75 DISSIPATION (W) EFFICIENCY (%) 90 70 65 60 0.8 1.5 0.6 1.2 0.4 0.2 55 50 2.5 1.8 25°C 25°C 0 0.4 0.8 1.2 1.6 0 2 0 0.
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LMZ14202EXT www.ti.com SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 Typical Performance Characteristics (continued) Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO = 100uF X7R Ceramic; Tambient = 25 C for efficiency curves and waveforms. Efficiency 36V Input @ 25°C Dissipation 36V Input @ 25°C 1.8 100 95 1.5 6.0 5.0 3.3 85 DISSIPATION (W) EFFICIENCY (%) 90 80 75 70 65 60 6.0 5.0 0.9 3.3 0.6 0.3 55 50 1.2 25°C 0 0.8 0.4 1.2 1.
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LMZ14202EXT SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO = 100uF X7R Ceramic; Tambient = 25 C for efficiency curves and waveforms. Efficiency 8V Input 85°C Dissipation 8V Input 85°C 100 1.6 3.3 5.0 1.4 2.5 1.5 1.8 2.5 90 DISSIPATION (W) EFFICIENCY (%) 1.2 80 1.8 70 1.2 1.5 3.3 1.0 0.8 1.2 5.0 0.6 0.4 60 0.2 85°C 85°C 0.0 50 0 0.
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LMZ14202EXT www.ti.com SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 Typical Performance Characteristics (continued) Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO = 100uF X7R Ceramic; Tambient = 25 C for efficiency curves and waveforms. Efficiency 36V Input @ 85°C Dissipation 36V Input @ 85°C 2.0 100 1.8 1.6 90 80 DISSIPATION (W) EFFICIENCY (%) 6.0 3.3 5.0 70 1.4 1.2 3.3 1.0 6.0 0.8 0.6 0.4 60 85°C 0.0 50 0 5.0 0.2 0.4 0.8 1.2 1.
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LMZ14202EXT SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com Typical Performance Characteristics (continued) Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO = 100uF X7R Ceramic; Tambient = 25 C for efficiency curves and waveforms. 3.36 Output Ripple 24VIN 3.3VO 2A, BW = 200 MHz Line and Load Regulation @ –55°C OUTPUT VOLTAGE (V) 3.34 3.32 3.30 6 8 12 24 3.28 42 36 -55°C 3.26 0 0.4 0.8 20 mV/Div 1.2 1.6 1.
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LMZ14202EXT www.ti.com SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 Typical Performance Characteristics (continued) Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO = 100uF X7R Ceramic; Tambient = 25 C for efficiency curves and waveforms. Current Limit 3.3VOUT @ 85°C 3.3 OUTPUT CURRENT (A) OUTPUT CURRENT (A) Current Limit 3.3VOUT @ –55°C 3.5 3.5 SHORT CIRCUIT 3.1 2.9 ONSET 2.7 3.3 SHORT CIRCUIT 3.1 2.9 2.7 85°C 2.
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LMZ14202EXT SNVS665F – 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.
PAGE 13
LMZ14202EXT www.ti.com SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 The LMZ14202EXT demonstration and evaluation boards use 11.8kΩ for RENB and 68.1kΩ for RENT resulting in a rising UVLO of 8V. This divider presents 6.25V to the EN input when the divider input is raised to 42V. 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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LMZ14202EXT SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com Solving: CO ≥ 2A*0.8V*10μH*24V / (4*3.3V*( 24V — 3.3V)*33mV) ≥ 43μF The LMZ14202EXT demonstration and evaluation boards are populated with a 100 uF 6.3V X5R output capacitor. Locations for extra output capacitors are provided. See AN-2024 SNVA422 for locations. CIN SELECTION The LMZ14202EXT module contains an internal 0.47 µF input ceramic capacitor.
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LMZ14202EXT www.ti.com SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 If RON calculated in Equation 8 is less than the minimum value determined in Equation 11 a lower frequency should be selected. Alternatively, VIN(MAX) can also be limited in order to keep the frequency unchanged. Additionally note, the minimum off-time of 260 ns limits the maximum duty ratio. Larger RON (lower FSW) should be selected in any application requiring large duty ratio.
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LMZ14202EXT SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com ILR P-P = VO*(VIN- VO)/(10µH*fSW*VIN) where • • VIN is the maximum input voltage fSW is determined from Equation 7 (14) If the output current IO is determined by assuming that IO = IL, the higher and lower peak of ILR can be determined. Be aware that the lower peak of ILR must be positive if CCM operation is required. POWER DISSIPATION AND BOARD THERMAL REQUIREMENTS For the design case of VIN = 24V, VO = 3.
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LMZ14202EXT www.ti.com SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 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 LMZ14202EXT to minimize noise. 4. Make input and output bus connections as wide as possible.
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LMZ14202EXT SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com Figure 37.
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LMZ14202EXT www.ti.com SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 Evaluation Board Schematic Diagram U1 EP VIN Enable VOUT FB 3.3VO @ 2A 7 GND SS 6 5 EN 4 3 2 1 VIN RON LMZ14202EXTTZ-ADJ 8V to 42V RENT 68.1k CFF 0.022 PF RFBT 3.32k RON 61.9k RENB 11.8k CIN2 10 PF CIN1 1 PF CSS 0.022 PF RFBB 1.
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LMZ14202EXT SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com Figure 38.
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LMZ14202EXT www.ti.com SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 Figure 39. Sample Reflow Profile Table 1. 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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LMZ14202EXT SNVS665F – JUNE 2010 – REVISED OCTOBER 2013 www.ti.com REVISION HISTORY Changes from Revision E (April 2013) to Revision F 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 25-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 LMZ14202EXTTZ/NOPB TOPMOD NDW 7 250 330.0 24.4 10.6 14.22 5.0 16.0 24.0 Q2 LMZ14202EXTTZX/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 25-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMZ14202EXTTZ/NOPB TO-PMOD NDW 7 250 367.0 367.0 45.0 LMZ14202EXTTZX/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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