Datasheet

ManualsBrandsTEXAS INSTRUMENTS ManualsPMICsLMZ23605TZE/NOPB

LMZ23605

www.ti.com

SNVS659H –MARCH 2011–REVISED OCTOBER 2013

LMZ23605 5A SIMPLE SWITCHER® Power Module with 36V Maximum Input Voltage

Check for Samples: LMZ23605

FEATURES

ELECTRICAL SPECIFICATIONS

• Integrated Shielded Inductor

• 30W Maximum Total Output Power

• Simple PCB Layout • Up to 5A 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 LMZ23605 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 5A load. The LMZ23605 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 LMZ23605 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

LMZ23605 only requires two external resistors and

LMZ22005/LMZ23603/LMZ22003

three external capacitors to complete the power

solution. The LMZ23605 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

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

(1)

Subpart B: 2007. See SNVA473 and Layout

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

for Information on Device Under Test. Vin =

= 12°C/W, θ

= 1.9°C/W

24V Vo = 3.3V Io = 5A

RoHS Compliant

Peak Reflow Case Temp = 245°C

• Low Component Count, only 5 External

Power Module SMT Guidelines

Components

• Low Output Voltage Ripple

• Uses PCB as Heat Sink, no Airflow Required

(1) Theta JA measured on a 3.5” x 3.5 ” four layer board, with

three ounce copper on outer layers and two ounce copper on

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

dissipation. Refer to application note 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.

2WEBENCH, SIMPLE SWITCHER 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 (30 pages)

PAGE 1
LMZ23605 www.ti.
PAGE 2
LMZ23605 SNVS659H – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com System Performance Thermal Derating Curve VIN = 12V VOUT = 5.0V Efficiency VIN = 12V VOUT = 5.
PAGE 3
LMZ23605 www.ti.com SNVS659H – MARCH 2011 – REVISED OCTOBER 2013 Connection Diagram PGND/EP Connect to AGND 7 6 5 4 3 2 1 VOUT SS/TRK FB AGND EN SYNC VIN Figure 2. Top View – 7-Lead PFM PIN DESCRIPTIONS Pin Name 1 VIN 2 SYNC 3 EN 4 AGND 5 FB 6 Description Supply input — Nominal operating range is 6V to 36V . A small amount of internal capacitance is contained within the package assembly. Additional external input capacitance is required between this pin and exposed pad (PGND).
PAGE 4
LMZ23605 SNVS659H – 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, FB to AGND -0.3V to 2.5V AGND to PGND -0.3V to 0.
PAGE 5
LMZ23605 www.ti.com SNVS659H – 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 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.
PAGE 6
LMZ23605 SNVS659H – 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 in slightly higher Output ripple – See DESIGN STEPS FOR THE LMZ23605 APPLICATION section. Efficiency 6.
PAGE 7
LMZ23605 www.ti.com SNVS659H – 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 in slightly higher Output ripple – See DESIGN STEPS FOR THE LMZ23605 APPLICATION section. Efficiency 2.
PAGE 8
LMZ23605 SNVS659H – 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 in slightly higher Output ripple – See DESIGN STEPS FOR THE LMZ23605 APPLICATION section. Efficiency 1.
PAGE 9
LMZ23605 www.ti.com SNVS659H – 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 in slightly higher Output ripple – See DESIGN STEPS FOR THE LMZ23605 APPLICATION section. Efficiency 6.
PAGE 10
LMZ23605 SNVS659H – 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 in slightly higher Output ripple – See DESIGN STEPS FOR THE LMZ23605 APPLICATION section. Efficiency 2.
PAGE 11
LMZ23605 www.ti.com SNVS659H – 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 in slightly higher Output ripple – See DESIGN STEPS FOR THE LMZ23605 APPLICATION section. Efficiency 1.
PAGE 12
LMZ23605 SNVS659H – 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 in slightly higher Output ripple – See DESIGN STEPS FOR THE LMZ23605 APPLICATION section.
PAGE 13
LMZ23605 www.ti.com SNVS659H – 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 in slightly higher Output ripple – See DESIGN STEPS FOR THE LMZ23605 APPLICATION section. Output ripple 12VIN 3.
PAGE 14
LMZ23605 SNVS659H – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com BLOCK DIAGRAM Linear Regulator 2M VIN 1 3 3 CIN EN CBST CINint 1 SYNC CSS 2 800 kHz PWM SS/TRK 3.3 uH VOUT VREF 3 RFBT CO FB 1 2 Comp RFBB AGND Regulator IC EP/ PGND Internal Passives DESIGN STEPS FOR THE LMZ23605 APPLICATION The LMZ23605 is fully supported by WEBENCH which offers: component selection, electrical and thermal simulations.
PAGE 15
LMZ23605 www.ti.com SNVS659H – MARCH 2011 – REVISED OCTOBER 2013 The LMZ23605 typical application shows 12.7kΩ for RENB and 42.2kΩ for RENT resulting in a rising UVLO of 5.46V. Note that this divider presents 8.33V to the input when the divider is raised to 36V which would exceed the recommended 5.5V limit for Enable. A midpoint 5.1V Zener clamp is applied to allow the application to cover the full 6V to 36V range of operation.
PAGE 16
LMZ23605 SNVS659H – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com This equation can be rearranged as follows: CSS = tSS * 50μA / 0.796V (7) Using a 0.22μF capacitor results in 3.5 msec typical soft-start duration; and 0.47μF results in 7.5 msec typical. 0.47 μF is a recommended initial value. As the soft-start input exceeds 0.796V the output of the power stage will be in regulation and the 50 μA current is deactivated.
PAGE 17
LMZ23605 www.ti.com SNVS659H – MARCH 2011 – REVISED OCTOBER 2013 One recommended output capacitor combination is a 220uF, 7 milliohm ESR specialty polymer cap in parallel with a 100 uF 6.3V X5R ceramic. This combination provides excellent performance that may exceed the requirements of certain applications. Additionally some small ceramic capacitors can be used for high frequency EMI suppression. CIN SELECTION The LMZ23605 module contains a small amount of internal ceramic input capacitors.
PAGE 18
LMZ23605 SNVS659H – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com As a result, approximately 93 square cm of 2 oz copper on top and bottom layers is required for the PCB design. The PCB copper heat sink must be connected to the exposed pad. Approximately sixty, 8mil thermal vias spaced 39 mils (1.0 mm) apart connect the top copper to the bottom copper. For an example of a high thermal performance PCB layout for SIMPLE SWITCHER power modules, refer to SNVA457, SNVA473, SNVA419 and SNVA424.
PAGE 19
LMZ23605 www.ti.com SNVS659H – MARCH 2011 – REVISED OCTOBER 2013 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.
PAGE 20
LMZ23605 SNVS659H – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com Figure 51. Pre-Biased Startup 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 21
LMZ23605 www.ti.com SNVS659H – MARCH 2011 – REVISED OCTOBER 2013 Typical Application Schematic Diagram U1 7V to 36V PGND/EP VIN Enable VOUT SS 3.3VO @ 5A 7 FB 6 AGND 5 EN 4 3 1 CIN6 OPT 150 PF 2 VIN + SYNC LMZ23605TZ RENT 42.2k SYNC D1 OPT 5.1V RENB 12.7k RENH OPT 100 CIN2,3 10 PF CIN1,5 0.047 PF RSNOPT 1.50 k: RFRA OPT 23.7: RFBT 3.32k CSS 0.47 PF RFBB 1.07k CO2 100 PF OPT CO1,6 0.047 PF + CO5 220 PF Figure 53. Table 1.
PAGE 22
LMZ23605 SNVS659H – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com Figure 54. Top View Evaluation Board – See SNVA457 Figure 55.
PAGE 23
LMZ23605 www.ti.
PAGE 24
LMZ23605 SNVS659H – MARCH 2011 – REVISED OCTOBER 2013 www.ti.com REVISION HISTORY Changes from Revision G (December 2012) to Revision H Page • Added Peak Reflow Case Temp = 245°C ............................................................................................................................ 1 • Deleted 10mil ........................................................................................................................................................................
PAGE 25
PACKAGE OPTION ADDENDUM www.ti.
PAGE 26
PACKAGE OPTION ADDENDUM www.ti.com 1-Jul-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.
PAGE 27
PACKAGE MATERIALS INFORMATION www.ti.com 1-Jul-2014 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 LMZ23605TZE/NOPB TOPMOD NDW 7 250 330.0 24.4 10.6 14.22 5.0 16.0 24.0 Q2 LMZ23605TZX/NOPB TOPMOD NDW 7 500 330.0 24.4 10.6 14.22 5.0 16.0 24.
PAGE 28
PACKAGE MATERIALS INFORMATION www.ti.com 1-Jul-2014 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LMZ23605TZE/NOPB TO-PMOD NDW 7 250 367.0 367.0 45.0 LMZ23605TZX/NOPB TO-PMOD NDW 7 500 367.0 367.0 45.
PAGE 29
MECHANICAL DATA NDW0007A BOTTOM SIDE OF PACKAGE TOP SIDE OF PACKAGE TZA07A (Rev D) www.ti.
PAGE 30
IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. Buyers should obtain the latest relevant information before placing orders and should verify that such information is current and complete.