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LMZ14203H

www.ti.com

SNVS692D –JANUARY 2011–REVISED OCTOBER 2013

3A SIMPLE SWITCHER

Power Module for High Output Voltage

Check for Samples: LMZ14203H

FEATURES

DESCRIPTION

The LMZ14203H SIMPLE SWITCHER power module

• Integrated Shielded Inductor

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

• Simple PCB Layout

of driving up to 3A load with exceptional power

• Flexible Startup Sequencing Using External

conversion efficiency, line and load regulation, and

Soft-Start and Precision Enable

output accuracy. The LMZ14203H is available in an

innovative package that enhances thermal

• Protection Against Inrush Currents

performance and allows for hand or machine

• Input UVLO and Output Short Circuit

soldering.

Protection

The LMZ14203H can accept an input voltage rail

• –40°C to 125°C Junction Temperature Range

between 6V and 42V and deliver an adjustable and

• Single Exposed Pad and Standard Pinout for

highly accurate output voltage as low as 5V. The

Easy Mounting and Manufacturing

LMZ14203H only requires three external resistors

and four external capacitors to complete the power

• Low Output Voltage Ripple

solution. The LMZ14203H is a reliable and robust

• Pin-to-Pin Compatible Family:

design with the following protection features: thermal

– LMZ14203H/2H/1H (42V max 3A, 2A, 1A)

shutdown, input under-voltage lockout, output over-

voltage protection, short-circuit protection, output

– LMZ14203/2/1 (42V max 3A, 2A, 1A)

current limit, and allows startup into a pre-biased

– LMZ12003/2/1 (20V max 3A, 2A, 1A)

output. A single resistor adjusts the switching

• Fully enabled for WEBENCH

Power Designer

frequency up to 1 MHz.

APPLICATIONS

• Intermediate Bus Conversions to 12V and 24V

Rail

• Time Critical Projects

• Space Constrained/High Thermal Requirement

Easy-to-Use 7-Pin Package

Applications

• Negative Output Voltage Applications

ELECTRICAL SPECIFICATIONS

• Up to 3A Output Current

• Input Voltage Range 6V to 42V

• Output Voltage as Low as 5V

• Efficiency up to 97%

PERFORMANCE BENEFITS

Figure 1. Easy to use PFM 7 Pin, see NDW

• High Efficiency Reduces System Heat

Package

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

Generation

= 16°C/W, θ

= 1.9°C/W

• Low Radiated EMI (EN 55022 Class B

RoHS Compliant

Compliant)

Peak Reflow Case Temp = 245°C

– EN 55022:2006, +A1:2007, FCC Part 15 Power Module SMT Guidelines

Subpart B: 2007

• No compensation required

• Low package thermal resistance

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.

2SIMPLE SWITCHER, WEBENCH 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 (29 pages)

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LMZ14203H www.ti.com SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 3A SIMPLE SWITCHER® Power Module for High Output Voltage Check for Samples: LMZ14203H FEATURES DESCRIPTION • • • The LMZ14203H SIMPLE SWITCHER power module is an easy-to-use step-down DC-DC solution capable of driving up to 3A load with exceptional power conversion efficiency, line and load regulation, and output accuracy.
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LMZ14203H SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 www.ti.com SYSTEM PERFORMANCE Efficiency VOUT = 12V 100 EFFICIENCY (%) 95 90 85 80 VIN = 15V VIN = 24V VIN = 30V VIN = 36V VIN = 42V 75 70 0.0 0.5 1.0 1.5 2.0 2.5 OUTPUT CURRENT (A) 3.0 Figure 2. Thermal Derating VOUT = 12V, θJA = 16°C/W 3.5 OUTPUT CURRENT (A) 3.0 2.5 2.0 1.5 1.0 VIN = 15V VIN = 24V VIN = 42V 0.5 0.0 -20 0 20 40 60 80 100 120 140 AMBIENT TEMPERATURE (°C) Figure 3.
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LMZ14203H www.ti.com SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 APPLICATION SCHEMATIC VOUT FB SS GND EN VIN RON VIN LMZ14203H VOUT 30V 24V 18V 15V 12V 5V RFBT 34 k: 34 k: 34 k: 34 k: 34 k: 34 k: RFBB 931: 1.18 k: 1.58 k: 1.91 k: 2.43 k: 6.49 k: RON 619 k: 499 k: 374 k: 287 k: 249 k: 100 k: COUT COUT-ESR 33 PF 1-45 m: 33 PF 1-40 m: 33 PF 1-40 m: 47 PF 1-42 m: 47 PF 1-45 m: 100 PF 1-95 m: VIN 34 - 42V 28 - 42V 22 - 42V 18 - 42V 15 - 42V 8 - 42V VOUT CFF RON 0.
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LMZ14203H SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 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. ABSOLUTE MAXIMUM RATINGS (1) (2) VIN, RON to GND -0.3V to 43.5V EN, FB, SS to GND -0.
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LMZ14203H www.ti.com SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 ELECTRICAL CHARACTERISTICS (continued) Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature (TJ) range of -40°C to +125°C. Minimum and Maximum limits are esnured 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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LMZ14203H SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO = 47uF; TAMB = 25°C. Efficiency VOUT = 5.0V TAMB = 25°C Power Dissipation VOUT = 5.0V TAMB = 25°C 100 POWER DISSIPATION (W) EFFICIENCY (%) 95 90 85 80 VIN = 8V VIN = 12V VIN = 24V VIN = 36V VIN = 42V 75 70 0.0 5 4 3 2 1 0 0.5 1.0 1.5 2.0 2.5 0.0 3.0 0.5 1.0 1.5 2.0 2.5 3.
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LMZ14203H www.ti.com SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO = 47uF; TAMB = 25°C. 100 Efficiency VOUT = 18V TAMB = 25°C 90 85 80 VIN = 24V VIN = 30V VIN = 36V VIN = 42V 75 70 0.0 100 1.0 1.5 3 2 1 2.0 2.5 3.0 0.0 0.5 1.0 1.5 2.0 2.5 3.0 OUTPUT CURRENT (A) Figure 13. Figure 14.
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LMZ14203H SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO = 47uF; TAMB = 25°C. Efficiency VOUT = 5.0V TAMB = 85°C Power Dissipation VOUT = 5.0V TAMB = 85°C 100 POWER DISSIPATION (W) EFFICIENCY (%) 95 90 85 80 VIN = 8V VIN = 12V VIN = 24V VIN = 36V VIN = 42V 75 70 0.0 100 1.0 1.5 2.0 2 1 2.5 0.0 3.0 0.5 1.0 1.5 2.0 2.5 3.
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LMZ14203H www.ti.com SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO = 47uF; TAMB = 25°C. Efficiency VOUT = 18V TAMB = 85°C Power Dissipation VOUT = 18V TAMB = 85°C 100 POWER DISSIPATION (W) EFFICIENCY (%) 95 90 85 80 VIN = 24V VIN = 30V VIN = 36V VIN = 42V 75 70 0.0 100 1.0 1.5 2.0 2.5 3 2 1 3.0 0.0 0.5 1.0 1.5 2.0 2.5 3.
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LMZ14203H SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO = 47uF; TAMB = 25°C. Thermal Derating VOUT = 12V, θJA = 16°C/W Thermal Derating VOUT = 12V, θJA = 20°C/W 3.5 3.5 3.0 OUTPUT CURRENT (A) OUTPUT CURRENT (A) 3.0 2.5 2.0 1.5 1.0 VIN = 15V VIN = 24V VIN = 42V 0.5 0.0 -20 0 20 40 2.5 2.0 1.5 1.0 0.5 60 0.
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LMZ14203H www.ti.com SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO = 47uF; TAMB = 25°C. Package Thermal Resistance θJA 4 Layer Printed Circuit Board with 1oz Copper 35 Line and Load Regulation TAMB = 25°C 12.6 0LFM (0m/s) air 225LFM (1.14m/s) air 500LFM (2.
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LMZ14203H SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO = 47uF; TAMB = 25°C. Switching Frequency vs Power Dissipation VOUT = 5V 6.0 6 5.5 5 POWER DISSIPATION (W) DC CURRENT LIMIT LEVEL (A) Current Limit vs Input Voltage VOUT = 5V 5.0 4.5 4.0 Fsw = 250kHz Fsw = 400kHz Fsw = 600kHz 3.5 4 3 2 1 3.
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LMZ14203H www.ti.com SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 24V; Cin = 10uF X7R Ceramic; CO = 47uF; TAMB = 25°C. Startup VIN = 24V IOUT = 3A Radiated EMI of Evaluation Board, VOUT = 12V RADIATED EMISSIONS (dB V/m) 80 VOUT ENABLE 1 ms/Div 5V/Div Emissions (Evaluation Board) EN 55022 Limit (Class B) 70 60 50 40 30 20 10 0 0 200 400 600 800 1,000 FREQUENCY (MHz) Figure 49.
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LMZ14203H SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 www.ti.com APPLICATION BLOCK DIAGRAM Vin RENT 3 VIN 1 EN Linear reg RENB Cvcc 5 SS CBST Css RON 2 VOUT 7 CFF 10 éH VO Co FB RFBT RFBB 0.47 éF RON Timer 6 CIN Regulator IC Internal Passives GND 4 Figure 52. Application Block Diagram 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 to an internal 0.8V reference.
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LMZ14203H www.ti.com SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 DESIGN STEPS FOR THE LMZ14203H APPLICATION The LMZ14203H is fully supported by WEBENCH® which offers the following: • Component selection • Electrical simulation • Thermal simulation • Build-it prototype board for a reduction in design time The following list of steps can be used to manually design the LMZ14203H application. 1. Select minimum operating VIN with enable divider resistors 2. Program VO with divider resistor selection 3.
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LMZ14203H SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 www.ti.com A table of values for RFBT , RFBB , and RON is included in the simplified applications schematic (see Figure 5). SOFT-START CAPACITOR, CSS, SELECTION Programmable soft-start permits the regulator to slowly ramp to its steady state operating point after being enabled, thereby reducing current inrush from the input supply and slowing the output voltage rise-time to prevent overshoot.
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LMZ14203H www.ti.com SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 INPUT CAPACITOR, CIN, SELECTION The LMZ14203H module contains an internal 0.47 µF input ceramic capacitor. Additional input capacitance is required external to the module to handle the input ripple current of the application. This input capacitance should be located as close as possible to the module. Input capacitor selection is generally directed to satisfy the input ripple current requirements rather than by capacitance value.
PAGE 18
LMZ14203H SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 www.ti.com Discontinuous Conduction and Continuous Conduction Modes At light load the regulator will operate in discontinuous conduction mode (DCM). With load currents above the critical conduction point, it will operate in continuous conduction mode (CCM). When operating in DCM the switching cycle begins at zero amps inductor current; increases up to a peak value, and then recedes back to zero before the end of the off-time.
PAGE 19
LMZ14203H www.ti.com SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 Using the 85°C TAMB power dissipation data as a conservative starting point, the power dissipation PD for VIN = 24V and VOUT = 12V is estimated to be 3.5W. The necessary θJA-MAX can now be calculated. θJA-MAX < (125°C - 65°C) / 3.5W θJA-MAX < 17.1°C/W (24) (25) To achieve this thermal resistance the PCB is required to dissipate the heat effectively.
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LMZ14203H SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 www.ti.com 1. Minimize area of switched current loops. From an EMI reduction standpoint, it is imperative to minimize the high di/dt paths during PC board layout. The high current loops that do not overlap have high di/dt content that will cause observable high frequency noise on the output pin if the input capacitor (Cin1) is placed at a distance away from the LMZ14203H.
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LMZ14203H www.ti.com SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 ADDITIONAL FEATURES OUTPUT OVER-VOLTAGE COMPARATOR The voltage at FB is compared to a 0.92V internal reference. If FB rises above 0.92V the on-time is immediately terminated. This condition is known as over-voltage protection (OVP). It can occur if the input voltage is increased very suddenly or if the output load is decreased very suddenly. Once OVP is activated, the top MOSFET on-times will be inhibited until the condition clears.
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LMZ14203H SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 www.ti.com Figure 56. Sample Reflow Profile Table 1. 22 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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LMZ14203H www.ti.com SNVS692D – JANUARY 2011 – REVISED OCTOBER 2013 REVISION HISTORY Changes from Revision C (June 2011) to Revision D 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 11-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 11-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 LMZ14203HTZ/NOPB TOPMOD NDW 7 250 330.0 24.4 10.6 14.22 5.0 16.0 24.0 Q2 LMZ14203HTZX/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 11-Oct-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMZ14203HTZ/NOPB TO-PMOD NDW 7 250 367.0 367.0 45.0 LMZ14203HTZX/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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