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LMZ23603

www.ti.com

SNVS711I –MARCH 2011–REVISED OCTOBER 2013

LMZ23603 3A SIMPLE SWITCHER

Power Module with 36V Maximum Input Voltage

Check for Samples: LMZ23603

FEATURES

ELECTRICAL SPECIFICATIONS

• Integrated Shielded Inductor

• 18W maximum total output power

• Simple PCB Layout • Up to 3A output current

• Frequency Synchronization Input (650 kHz to • Input voltage range 6V to 36V

950 kHz)

• Output voltage range 0.8V to 6V

• Flexible Startup Sequencing Using External

• Efficiency up to 92%

Soft-start, Tracking and Precision Enable

• Protection Against Inrush Currents and Faults DESCRIPTION

Such as Input UVLO and Output Short Circuit

The LMZ23603 SIMPLE SWITCHER power module

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

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

of driving up to 3A load. The LMZ23603 is available

• Single Exposed Pad and Standard Pinout for

in an innovative package that enhances thermal

Easy Mounting and Manufacturing

performance and allows for hand or machine

• Fast Transient Response for Powering FPGAs

soldering.

and ASICs

The LMZ23603 can accept an input voltage rail

• Fully Enabled for WEBENCH

Power Designer

between 6V and 36V and deliver an adjustable and

highly accurate output voltage as low as 0.8V. The

• Pin Compatible with

LMZ23603 only requires two external resistors and

LMZ22005/LMZ23605/LMZ22003

three external capacitors to complete the power

solution. The LMZ23603 is a reliable and robust

APPLICATIONS

design with the following protection features: thermal

• Point of Load Conversions from 12V and 24V

shutdown, programmable input under-voltage lockout,

Input Rail

output over-voltage protection, short-circuit protection,

output current limit, and allows startup into a pre-

• Time Critical Projects

biased output. The sync input allows synchronization

• Space Constrained / High Thermal

over the 650 to 950 kHz switching frequency range.

Requirement Applications

• Negative Output Voltage Applications (See AN-

2027, literature number SNVA425)

PERFORMANCE BENEFITS

• High efficiency reduces system heat

generation

• Complies with EN55022 Class B

– EN 55022:2006, +A1:2007, FCC Part 15

Figure 1. Easy to use PFM 7 Pin Package

Subpart B: 2007.

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

– See AN-2125 (literature number SNVA473)

= 12°C/W, θ

= 1.9°C/W

(1)

and layout for information on device under

RoHS Compliant

Peak Reflow Case Temp = 245°C

test.

Power Module SMT Guidelines

– V

= 24V, V

= 3.3V, I

= 3A

• Low component count, only 5 external

components

(1) θ

measured on a 3.5” x 3.5” four layer board, with three

• Low output voltage ripple

ounce copper on outer layers and two ounce copper on inner

• Uses PCB as heat sink, no airflow required

layers, sixty thermal vias, no air flow, and 1W power

dissipation. Refer to PCB layout diagrams.

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 (31 pages)

PAGE 1
LMZ23603 www.ti.
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LMZ23603 SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com System Performance 100 4 EFFICIENCY (%) 80 3 70 60 50 2 40 30 1 20 DISSIPATION (W) 90 10 0 0 0.00.20.40.60.81.01.21.41.61.82.02.22.42.62.83.0 OUTPUT CURRENT (A) Figure 2. Efficiency VIN = 12V VOUT = 5.0V MAXIMUM OUTPUT CURRENT (A) 4 3 2 1 JA = 12°C/W 0 30 40 50 60 70 80 90 100 110 120 130 AMBIENT TEMPERATURE (°C) Figure 3. Thermal derating curve VIN = 12V VOUT = 5.
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LMZ23603 www.ti.com SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 Simplified Application Schematic VOUT SS/TRK FB PGND AGND EN VIN SYNC VIN LMZ23603 VOUT 6V 5V 3.3V 2.5V 1.8V 1.5V 1.2V 1.0V 0.8V RFBT 15.4k 5.62k 3.32k 2.26k 1.87k 1.00k 1.07k 1.62k 0 RFBB 2.37k 1.07k 1.07k 1.07k 1.50k 1.13k 2.05k 6.49k 8.06K VIN Range 10...36V 9...36V 7...36V 6...36V 6...36V 6...36V 6...36V 6...36V 6...36V VOUT @ 3A RFBT Enable See Table CIN CSS RFBB 22 PF 0.
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LMZ23603 SNVS711I – MARCH 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 to PGND -0.3V to 40V EN, SYNC to AGND -0.3V to 5.5V SS/TRK, FBto AGND -0.3V to 2.5V AGND to PGND -0.3V to 0.
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LMZ23603 www.ti.com SNVS711I – MARCH 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 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.
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LMZ23603 SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise specified, the following conditions apply: VIN = 12V; Cin = 2 x 10μF + 1μF X7R Ceramic; CO = 220μF Specialty Polymer + 10 uF Ceramic; Tambient = 25° C for waveforms. Efficiency and dissipation plots marked with * have cycle skipping at light loads resulting is slightly higher output ripple – See Design Steps for the LMZ23603 Application section. Efficiency 6.
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LMZ23603 www.ti.com SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 12V; Cin = 2 x 10μF + 1μF X7R Ceramic; CO = 220μF Specialty Polymer + 10 uF Ceramic; Tambient = 25° C for waveforms. Efficiency and dissipation plots marked with * have cycle skipping at light loads resulting is slightly higher output ripple – See Design Steps for the LMZ23603 Application section. Efficiency 2.
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LMZ23603 SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 12V; Cin = 2 x 10μF + 1μF X7R Ceramic; CO = 220μF Specialty Polymer + 10 uF Ceramic; Tambient = 25° C for waveforms. Efficiency and dissipation plots marked with * have cycle skipping at light loads resulting is slightly higher output ripple – See Design Steps for the LMZ23603 Application section. Efficiency 1.
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LMZ23603 www.ti.com SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 12V; Cin = 2 x 10μF + 1μF X7R Ceramic; CO = 220μF Specialty Polymer + 10 uF Ceramic; Tambient = 25° C for waveforms. Efficiency and dissipation plots marked with * have cycle skipping at light loads resulting is slightly higher output ripple – See Design Steps for the LMZ23603 Application section. Efficiency 6.
PAGE 10
LMZ23603 SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 12V; Cin = 2 x 10μF + 1μF X7R Ceramic; CO = 220μF Specialty Polymer + 10 uF Ceramic; Tambient = 25° C for waveforms. Efficiency and dissipation plots marked with * have cycle skipping at light loads resulting is slightly higher output ripple – See Design Steps for the LMZ23603 Application section. Efficiency 2.
PAGE 11
LMZ23603 www.ti.com SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 12V; Cin = 2 x 10μF + 1μF X7R Ceramic; CO = 220μF Specialty Polymer + 10 uF Ceramic; Tambient = 25° C for waveforms. Efficiency and dissipation plots marked with * have cycle skipping at light loads resulting is slightly higher output ripple – See Design Steps for the LMZ23603 Application section. Efficiency 1.
PAGE 12
LMZ23603 SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Thermal derating VIN = 12V, VOUT = 5.0V Thermal derating VIN = 12V, VOUT = 3.3V 4 4 MAXIMUM OUTPUT CURRENT (A) MAXIMUM OUTPUT CURRENT (A) Unless otherwise specified, the following conditions apply: VIN = 12V; Cin = 2 x 10μF + 1μF X7R Ceramic; CO = 220μF Specialty Polymer + 10 uF Ceramic; Tambient = 25° C for waveforms.
PAGE 13
LMZ23603 www.ti.com SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 12V; Cin = 2 x 10μF + 1μF X7R Ceramic; CO = 220μF Specialty Polymer + 10 uF Ceramic; Tambient = 25° C for waveforms. Efficiency and dissipation plots marked with * have cycle skipping at light loads resulting is slightly higher output ripple – See Design Steps for the LMZ23603 Application section.
PAGE 14
LMZ23603 SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com BLOCK DIAGRAM VIN Linear Regulator 2M CIN CBST EN CINint SYNC 800 kHz PWM SS/TRK CSS 3.3 uH VO 0.
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LMZ23603 www.ti.com SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 DESIGN STEPS FOR THE LMZ23603 APPLICATION The LMZ23603 is fully supported by WEBENCH which offers: component selection, electrical and thermal simulations. Additionally there are both evaluation and demonstration boards that may be used as a starting point for design. The following list of steps can be used to manually design the LMZ23603 application. All • • • • • • references to values refer to the typical applications schematic.
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LMZ23603 SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com INT-VCC (5V) VIN 21 PA 2.0M RENT 42.2k RENH ENABLE RUN 100: 5.1V RENB 12.7k 1.279V Figure 51. Enable Input Detail 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 regulated output voltage determined by the external divider resistors RFBT and RFBB is: VO = 0.
PAGE 17
LMZ23603 www.ti.com SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 TRACKING SUPPLY DIVIDER OPTION The tracking function allows the module to be connected as a slave supply to a primary voltage rail (often the 3.3V system rail) where the slave module output voltage is lower than that of the master. Proper configuration allows the slave rail to power up coincident with the master rail such that the voltage difference between the rails during ramp-up is small (i.e. <0.15V typ).
PAGE 18
LMZ23603 SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com CIN SELECTION The LMZ23603 module contains a small amount of internal ceramic input capacitance. Additional input capacitance is required external to the module to handle the input ripple current of the application. The input capacitor can be several capacitors in parallel. This input capacitance should be located in very close proximity to the module.
PAGE 19
LMZ23603 www.ti.com SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 PC BOARD LAYOUT GUIDELINES PC board layout is an important part of DC-DC converter design. Poor board layout can disrupt the performance of a DC-DC converter and surrounding circuitry by contributing to EMI, ground bounce and resistive voltage drop in the traces. These can send erroneous signals to the DC-DC converter resulting in poor regulation or instability. Good layout can be implemented by following a few simple design rules.
PAGE 20
LMZ23603 SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com ADDITIONAL FEATURES SYNCHRONIZATION INPUT The PWM switching frequency can be synchronized to an external frequency source. If this feature is not used, connect this input either directly to ground, or connect to ground through a resistor of 1.5 kΩ ohm or less. The allowed synchronization frequency range is 650kHz to 950 kHz. The typical input threshold is 1.4V transition level.
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LMZ23603 www.ti.com SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 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). In CCM, current flows through the inductor through the entire switching cycle and never falls to zero during the off-time.
PAGE 22
LMZ23603 SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com Simplified Evaluation Board Schematic Diagram U1 7V to 36V PGND/EP VIN Enable VOUT SS 3.3VO @ 3A 7 FB 6 AGND 5 EN 4 3 1 CIN6 OPT 2 VIN + SYNC LMZ23603TZ 150 PF RFBT RENT 3.32k 42.2k SYNC RFRA OPT 23.7Ö RENH OPT D1 OPT 5.1V RENB 12.7k CIN2,3 10 PF 100Ö CIN1,5 0.047 PF RSNOPT RFBB CSS 0.47µF 1.07k CO2 100 PF OPT CO1,6 0.047 PF + CO5 220 PF 1.50 kÖ Figure 56. Table 1.
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LMZ23603 www.ti.com SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 Figure 57. Top View Evaluation Board See AN-2085 (literature number SNVA457) Figure 58.
PAGE 24
LMZ23603 SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 • • • • • www.ti.com Stencil Aperture – For the exposed die attach pad (DAP), adjust the stencil for approximately 80% coverage of the PCB land pattern – For all other I/O pads use a 1:1 ratio between the aperture and the land pattern recommendation Solder Paste – Use a standard SAC Alloy such as SAC 305, type 3 or higher Stencil Thickness – 0.125 to 0.
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LMZ23603 www.ti.com SNVS711I – MARCH 2011 – REVISED OCTOBER 2013 REVISION HISTORY Changes from Revision H (April 2013) to Revision I 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 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 4-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 LMZ23603TZE/NOPB TOPMOD NDW 7 250 330.0 24.4 10.6 14.22 5.0 16.0 24.0 Q2 LMZ23603TZX/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 4-Oct-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMZ23603TZE/NOPB TO-PMOD NDW 7 250 367.0 367.0 45.0 LMZ23603TZX/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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