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LMZ23610

www.ti.com

SNVS707E –MARCH 2011–REVISED OCTOBER 2013

LMZ23610 10A SIMPLE SWITCHER

Power Module with 36V Maximum Input Voltage and

Current Sharing

Check for Samples: LMZ23610

KEY FEATURES

ELECTRICAL SPECIFICATIONS

• Integrated Shielded Inductor

• 50W Maximum Total Output Power

• Simple PCB Layout • Up to 10A Output Current

• Frequency Synchronization Input (350 kHz to • Input Voltage Range 6V to 36V

600 kHz)

• Output Voltage Range 0.8V to 6V

• Current Sharing Capability

• Efficiency up to 92%

• Flexible Startup Sequencing Using External

Soft-start, Tracking and Precision Enable DESCRIPTION

The LMZ23610 SIMPLE SWITCHER power module

• Protection Against Inrush Currents and Faults

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

Such as Input UVLO and Output Short Circuit

of driving up to 10A load. The LMZ23610 is available

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

in an innovative package that enhances thermal

• Single Exposed Pad and Standard Pinout for

performance and allows for hand or machine

Easy Mounting and Manufacturing

soldering.

• Fully Enabled for WEBENCH

Power Designer

The LMZ23610 can accept an input voltage rail

• Pin Compatible with LMZ22010/08,

between 6V and 36V and deliver an adjustable and

highly accurate output voltage as low as 0.8V. The

LMZ12010/08, LMZ23608/06H, and

LMZ23610 only requires two external resistors and

LMZ13610/08/06H

three external capacitors to complete the power

solution. The LMZ23610 is a reliable and robust

APPLICATIONS

design with the following protection features: thermal

• Point of Load Conversions from 12V and 24V

shutdown, input under-voltage lockout, output over-

Input Rail

voltage protection, short-circuit protection, output

current limit, and allows startup into a pre-biased

• Time Critical Projects

output. The sync input allows synchronization over

• Space Constrained / High Thermal

the 350 to 600 kHz switching frequency range.

Requirement Applications

• Negative Output Voltage Applications (See AN-

2027, literature number SNVA425)

PERFORMANCE BENEFITS

• High Efficiency Reduces System Heat

Generation

• Low Radiated Emissions (EMI) Complies with

EN55022 Class B Standard

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

Subpart B, Tested on Evaluation Board with

Figure 1. Easy to use PFM 11 Pin Package

EMI Configuration

15 x 17.79 x 5.9 mm (0.59 x 0.7 x 0.232 in)

• Only 7 External Components

= 9.9 °C/W, θ

= 1.0 °C/W

(1)

RoHS Compliant

• Low Output Voltage Ripple

Peak Reflow Case Temp = 245°C

• No External Heat Sink Required

Power Module SMT Guidelines

• Simple Current Sharing for Higher Current

Applications

(1) θ

measured on a 75mm x 90mm four layer PCB.

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 (33 pages)

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LMZ23610 www.ti.
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LMZ23610 SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com System Performance 100 MAXIMUM OUTPUT CURRENT (A) 12 EFFICIENCY (%) 90 80 70 60 50 40 30 24 Vin 20 0 1 2 3 4 5 6 7 8 OUTPUT CURRENT (A) 10 8 6 4 2 JA = 9.9 °C/W JA = 6.8 °C/W JA = 5.2 °C/W 0 9 10 20 Figure 2. Efficiency VIN = 24V VOUT = 3.3V 40 60 80 100 TEMPERATURE (C) 120 Figure 3. Thermal derating curve VIN = 24V, VOUT = 3.
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LMZ23610 www.ti.com SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 Connection Diagram 11 10 9 8 7 6 5 4 3 2 1 PGND/EP Connect to AGND VOUT VOUT SH SS FB AGND AGND EN SYNC VIN VIN Figure 5. Top View 11-Lead PFM PIN DESCRIPTIONS Pin Name Description 1, 2 VIN 3 SYNC Sync Input — Apply a CMOS logic level square wave whose frequency is between 350 kHz and 600 kHz to synchronize the PWM operating frequency to an external frequency source. When not using synchronization this pin must be tied to ground.
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LMZ23610 SNVS707E – 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, FB, SH to AGND -0.3V to 2.5V AGND to PGND -0.3V to 0.
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LMZ23610 www.ti.com SNVS707E – 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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LMZ23610 SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS Unless otherwise specified, the following conditions apply: VIN = 12V; CIN = three x 10μF + 47nF X7R Ceramic; COUT = two x 330μF Specialty Polymer + 47 uF Ceramic + 47nF Ceramic; CFF = 4.7nF; Tambient = 25° C for waveforms. All indicated temperatures are ambient. Dissipation 5.0V output @ 25°C 12 90 10 DISSIPATION (W) EFFICIENCY (%) Efficiency 5.
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LMZ23610 www.ti.com SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 12V; CIN = three x 10μF + 47nF X7R Ceramic; COUT = two x 330μF Specialty Polymer + 47 uF Ceramic + 47nF Ceramic; CFF = 4.7nF; Tambient = 25° C for waveforms. All indicated temperatures are ambient. Dissipation 1.8V output @ 25°C 12 80 10 DISSIPATION (W) EFFICIENCY (%) Efficiency 1.
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LMZ23610 SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 12V; CIN = three x 10μF + 47nF X7R Ceramic; COUT = two x 330μF Specialty Polymer + 47 uF Ceramic + 47nF Ceramic; CFF = 4.7nF; Tambient = 25° C for waveforms. All indicated temperatures are ambient. Efficiency 1.0V output @ 25°C Dissipation 1.
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LMZ23610 www.ti.com SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 12V; CIN = three x 10μF + 47nF X7R Ceramic; COUT = two x 330μF Specialty Polymer + 47 uF Ceramic + 47nF Ceramic; CFF = 4.7nF; Tambient = 25° C for waveforms. All indicated temperatures are ambient. Efficiency 2.5V output @ 85°C 100 Dissipation 2.
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LMZ23610 SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 12V; CIN = three x 10μF + 47nF X7R Ceramic; COUT = two x 330μF Specialty Polymer + 47 uF Ceramic + 47nF Ceramic; CFF = 4.7nF; Tambient = 25° C for waveforms. All indicated temperatures are ambient. Dissipation 1.2V output @ 85°C 14 80 12 70 DISSIPATION (W) EFFICIENCY (%) Efficiency 1.
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LMZ23610 www.ti.com SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 12V; CIN = three x 10μF + 47nF X7R Ceramic; COUT = two x 330μF Specialty Polymer + 47 uF Ceramic + 47nF Ceramic; CFF = 4.7nF; Tambient = 25° C for waveforms. All indicated temperatures are ambient.
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LMZ23610 SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 12V; CIN = three x 10μF + 47nF X7R Ceramic; COUT = two x 330μF Specialty Polymer + 47 uF Ceramic + 47nF Ceramic; CFF = 4.7nF; Tambient = 25° C for waveforms. All indicated temperatures are ambient. Output ripple 12VIN, 1.2VOUT @ Full Load, BW = 20 MHz Output ripple 12VIN, 1.2VOUT@ Full Load, BW = 250 MHz Figure 42. Figure 43.
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LMZ23610 www.ti.com SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 TYPICAL PERFORMANCE CHARACTERISTICS (continued) Unless otherwise specified, the following conditions apply: VIN = 12V; CIN = three x 10μF + 47nF X7R Ceramic; COUT = two x 330μF Specialty Polymer + 47 uF Ceramic + 47nF Ceramic; CFF = 4.7nF; Tambient = 25° C for waveforms. All indicated temperatures are ambient. 3.3VOUT Soft Start, no CSS 3.3VOUT Soft Start, CSS = 0.47uF Figure 48. Figure 49.
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LMZ23610 SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com BLOCK DIAGRAM Linear Regulator 2M VIN 1 3 3 CIN EN 2 350 kHz PWM SS 2.
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LMZ23610 www.ti.com SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 DESIGN STEPS FOR THE LMZ23610 APPLICATION The LMZ23610 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 LMZ23610 application. All references to values refer to the typical applications schematic.
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LMZ23610 SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com INT-VCC (5V) VIN 13 PA 2.0M RENT 42.2k RENH ENABLE RUN 100: 5.1V RENB 12.7k 1.274V Figure 50. Enable input detail OUTPUT VOLTAGE SELECTION Output voltage is determined by a divider of two resistors connected between VOUT and AGND. 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: VOUT = 0.
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LMZ23610 www.ti.com SNVS707E – 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).
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LMZ23610 SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com Note that the stability requirement for minimum output capacitance must always be met. One recommended output capacitor combination is two 330μF, 15 mOhm ESR tantalum polymer capacitors connected in parallel with a 47 uF 6.3V X5R ceramic. This combination provides excellent performance that may exceed the requirements of certain applications. Additionally some small 47nF ceramic capacitors can be used for high frequency EMI suppression.
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LMZ23610 www.ti.com SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 POWER DISSIPATION AND BOARD THERMAL REQUIREMENTS When calculating module dissipation use the maximum input voltage and the average output current for the application. Many common operating conditions are provided in the characteristic curves such that less common applications can be derived through interpolation. In all designs, the junction temperature must be kept below the rated maximum of 125°C.
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LMZ23610 SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com 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.
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LMZ23610 www.ti.com SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 ADDITIONAL FEATURES SYNCHRONIZATION INPUT The PWM switching frequency can be synchronized to an external frequency source. The PWM switching will be in phase with the 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 314 kHz to 600 kHz. The typical input threshold is 1.4V.
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LMZ23610 SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com VOUT SH SS X X Clk CIN_BYP FB AGND PGND EN SYNC VIN SLAVE Share COUT_BYP Enable VIN VOUT Clk CIN_BYP VOUT SH SS FB AGND PGND EN VIN CIN_BULK SYNC MASTER COUT_BULK LOAD Share CSS Enable COUT_BYP RFBB RFBT Figure 53. Current Sharing Example Schematic Figure 54. Output voltage ripple of two modules with synchronization clocks in phase Figure 55.
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LMZ23610 www.ti.com SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 CURRENT LIMIT The LMZ23610 is protected by both low side (LS) and high side (HS) current limit circuitry. The LS current limit detection is carried out during the off-time by monitoring the current through the LS synchronous MOSFET. Referring to the Functional Block Diagram, when the top MOSFET is turned off, the inductor current flows through the load, the PGND pin and the internal synchronous MOSFET.
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LMZ23610 SNVS707E – MARCH 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, inductor current is maintained to an average value equaling Iout .
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LMZ23610 www.ti.com SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 Typical Application Schematic Diagram and BOM CIN2,3,4 CIN1 VOUT SH SS FB PGND AGND Clk + CIN5 (OPT) CIN6 (OPT) EN VIN SYNC VIN LMZ23610 VOUT Share CSS RSYNC CO3,4 CO1 (OPT) CO2 (OPT) CO5 (OPT) LOAD RFBB RENT RFBT RENB D1 5.1V (OPT) Table 1.
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LMZ23610 SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com Figure 58.
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LMZ23610 www.ti.
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LMZ23610 SNVS707E – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com REVISION HISTORY Changes from Revision D (December 2012) to Revision E Page • Added Peak Reflow Case Temp = 245°C ............................................................................................................................ 1 • Deleted 12mil ........................................................................................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Oct-2013 TAPE AND REEL INFORMATION *All dimensions are nominal Device LMZ23610TZE/NOPB Package Package Pins Type Drawing PFM NDY 11 SPQ 250 Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) 330.0 32.4 Pack Materials-Page 1 15.45 B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant 18.34 6.2 20.0 32.
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PACKAGE MATERIALS INFORMATION www.ti.com 8-Oct-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMZ23610TZE/NOPB PFM NDY 11 250 367.0 367.0 55.
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MECHANICAL DATA NDY0011A BOTTOM SIDE OF PACKAGE TOP SIDE OF PACKAGE TZA11A (Rev F) www.ti.
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