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LM2675

www.ti.com

SNVS129E –MAY 2004–REVISED JUNE 2005

LM2675 SIMPLE SWITCHER

Power Converter High Efficiency 1A Step-Down Voltage

Regulator

Check for Samples: LM2675

FEATURES

DESCRIPTION

The LM2675 series of regulators are monolithic

234

• Efficiency up to 96%

integrated circuits built with a LMDMOS process.

• Available in 8-pin SOIC and PDIP Packages

These regulators provide all the active functions for a

and a 16-pin WSON Package

step-down (buck) switching regulator, capable of

• Computer Design Software LM267X Made

driving a 1A load current with excellent line and load

regulation. These devices are available in fixed output

Simple (version 6.0)

voltages of 3.3V, 5.0V, 12V, and an adjustable output

• Simple and Easy to Design with

version.

• Requires Only 5 External Components

Requiring a minimum number of external

• Uses Readily Available Standard Inductors

components, these regulators are simple to use and

• 3.3V, 5.0V, 12V, and Adjustable Output

include patented internal frequency compensation

Versions

(Patent Nos. 5,382,918 and 5,514,947) and a fixed

frequency oscillator.

• Adjustable Version Output Voltage Range:

1.21V to 37V

The LM2675 series operates at a switching frequency

• ±1.5% Max Output Voltage Tolerance Over of 260 kHz, thus allowing smaller sized filter

components than what would be needed with lower

Line and Load Conditions

frequency switching regulators. Because of its very

• Ensured 1A Output Load Current

high efficiency (>90%), the copper traces on the

• 0.25Ω DMOS Output Switch

printed circuit board are the only heat sinking needed.

• Wide Input Voltage Range: 8V to 40V

A family of standard inductors for use with the

• 260 kHz Fixed Frequency Internal Oscillator

LM2675 are available from several different

manufacturers. This feature greatly simplifies the

• TTL Shutdown Capability, Low Power Standby

design of switch-mode power supplies using these

Mode

advanced ICs. Also included in the datasheet are

• Thermal Shutdown and Current Limit

selector guides for diodes and capacitors designed to

Protection

work in switch-mode power supplies.

Other features include a ensured ±1.5% tolerance on

TYPICAL APPLICATIONS

output voltage within specified input voltages and

• Simple High Efficiency (>90%) Step-Down

output load conditions, and ±10% on the oscillator

(Buck) Regulator

frequency. External shutdown is included, featuring

typically 50 μA stand-by current. The output switch

• Efficient Pre-Regulator for Linear Regulators

includes current limiting, as well as thermal shutdown

• Positive-to-Negative Converter

for full protection under fault conditions.

To simplify the LM2675 buck regulator design

procedure, there exists computer design software,

LM267X Made Simple version 6.0.

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 is a registered trademark of Texas Instruments.

3Windows is a registered trademark of Microsoft Corporation.

4All 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)

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LM2675 www.ti.com SNVS129E – MAY 2004 – REVISED JUNE 2005 LM2675 SIMPLE SWITCHER® Power Converter High Efficiency 1A Step-Down Voltage Regulator Check for Samples: LM2675 FEATURES DESCRIPTION • Efficiency up to 96% • Available in 8-pin SOIC and PDIP Packages and a 16-pin WSON Package • Computer Design Software LM267X Made Simple (version 6.0) • Simple and Easy to Design with • Requires Only 5 External Components • Uses Readily Available Standard Inductors • 3.3V, 5.
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LM2675 SNVS129E – MAY 2004 – REVISED JUNE 2005 www.ti.com Typical Application Connection Diagram CB 1 16 VSW * 2 15 VSW * 3 14 VIN DAP** 13 * * 5 12 GND * 6 11 GND * 7 10 * FB 8 9 ON/OFF * 4 * No Connections **Connect to Pins 11, 12 on PCB Figure 1. 16-Lead WSON Surface Mount Package Top View Package Drawing Number NHN0016A Figure 2. 8-Lead SOIC/PDIP Package Top View Package Drawing Number D0008A/P0008E These devices have limited built-in ESD protection.
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LM2675 www.ti.com SNVS129E – MAY 2004 – REVISED JUNE 2005 Absolute Maximum Ratings (1) (2) Supply Voltage 45V −0.1V ≤ VSH ≤ 6V ON/OFF Pin Voltage −1V Switch Voltage to Ground Boost Pin Voltage VSW + 8V −0.
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LM2675 SNVS129E – MAY 2004 – REVISED JUNE 2005 www.ti.com LM2675-5.0 Electrical Characteristics Symbol Parameter Conditions SYSTEM PARAMETERS Test Circuit Figure 22 Typ (1) Min (2) Max (2) Units (3) VOUT Output Voltage VIN = 8V to 40V, ILOAD = 20 mA to 1A 5.0 4.925/4.850 5.075/5.150 V VOUT Output Voltage VIN = 6.5V to 40V, ILOAD = 20 mA to 500 mA 5.0 4.925/4.850 5.075/5.
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LM2675 www.ti.com SNVS129E – MAY 2004 – REVISED JUNE 2005 All Output Voltage Versions Electrical Characteristics (continued) Specifications with standard type face are for TJ = 25°C, and those with bold type face apply over full Operating Temperature Range. Unless otherwise specified, VIN = 12V for the 3.3V, 5V, and Adjustable versions and VIN = 24V for the 12V version, and ILOAD = 100 mA. Symbol Parameters Conditions VIN = 40V, ON/OFF Pin = 0V VSWITCH = 0V Typ Max Units 25 μA 6 15 mA 0.25 0.
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LM2675 SNVS129E – MAY 2004 – REVISED JUNE 2005 www.ti.com Typical Performance Characteristics 6 Normalized Output Voltage Line Regulation Figure 3. Figure 4. Efficiency Drain-to-Source Resistance Figure 5. Figure 6. Switch Current Limit Operating Quiescent Current Figure 7. Figure 8.
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LM2675 www.ti.com SNVS129E – MAY 2004 – REVISED JUNE 2005 Typical Performance Characteristics (continued) Standby Quiescent Current ON/OFF Threshold Voltage Figure 9. Figure 10. ON/OFF Pin Current (Sourcing) Switching Frequency Figure 11. Figure 12. Feedback Pin Bias Current Peak Switch Current Figure 13. Figure 14.
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LM2675 SNVS129E – MAY 2004 – REVISED JUNE 2005 www.ti.com Typical Performance Characteristics (continued) Dropout Voltage—3.3V Option Dropout Voltage—5.0V Option Figure 15. m Figure 16. Block Diagram * Active Inductor Patent Number 5,514,947 † Active Capacitor Patent Number 5,382,918 Figure 17.
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LM2675 www.ti.com SNVS129E – MAY 2004 – REVISED JUNE 2005 Typical Performance Characteristics (Circuit of Figure 22) Continuous Mode Switching Waveforms VIN = 20V, VOUT = 5V, ILOAD = 1A L = 47 μH, COUT = 68 μF, COUTESR = 50 mΩ A: VSW Pin Voltage, 10 V/div. B: Inductor Current, 0.5 A/div C: Output Ripple Voltage, 20 mV/div AC-Coupled Figure 18.
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LM2675 SNVS129E – MAY 2004 – REVISED JUNE 2005 www.ti.com Test Circuit and Layout Guidelines CIN - 22 μF, 50V Tantalum, Sprague “199D Series” COUT - 47 μF, 25V Tantalum, Sprague “595D Series” D1 - 3.3A, 50V Schottky Rectifier, IR 30WQ05F L1 - 68 μH Sumida #RCR110D-680L CB - 0.01 μF, 50V Ceramic Figure 22. Standard Test Circuits and Layout Guides Fixed Output Voltage Versions CIN - 22 μF, 50V Tantalum, Sprague “199D Series” COUT - 47 μF, 25V Tantalum, Sprague “595D Series” D1 - 3.
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LM2675 www.ti.com SNVS129E – MAY 2004 – REVISED JUNE 2005 LM2675 Series Buck Regulator Design Procedure (Fixed Output) PROCEDURE (Fixed Output Voltage Version) EXAMPLE (Fixed Output Voltage Version) To simplify the buck regulator design procedure, Texas Instruments is making available computer design software to be used with the SIMPLE SWITCHERline of switching regulators.LM267X Made Simpleversion 6.0 is available on Windows® 3.1, NT, or 95 operating systems.
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LM2675 SNVS129E – MAY 2004 – REVISED JUNE 2005 www.ti.com PROCEDURE (Fixed Output Voltage Version) 3. Catch Diode Selection (D1) A. In normal operation, the average current of the catch diode is the load current times the catch diode duty cycle, 1-D (D is the switch duty cycle, which is approximately the output voltage divided by the input voltage). The largest value of the catch diode average current occurs at the maximum load current and maximum input voltage (minimum D).
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LM2675 www.ti.com SNVS129E – MAY 2004 – REVISED JUNE 2005 Inductor Value Selection Guides (For Continuous Mode Operation) Figure 24. LM2675-3.3 Figure 25. LM2675-5.0 Figure 26. LM2675-12 Figure 27. LM2675-ADJ Table 1. Inductor Manufacturers' Part Numbers Ind. Inductance Ref. (μH) Desg. Schott Current (A) Through Renco Surface Hole Mount Through Pulse Engineering Surface Through Surface Coilcraft Surface Hole Mount Hole Mount L4 68 0.
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LM2675 SNVS129E – MAY 2004 – REVISED JUNE 2005 www.ti.com Table 1. Inductor Manufacturers' Part Numbers (continued) Schott Ind. Inductance Ref. (μH) Desg. Current (A) Through Renco Surface Hole Mount Pulse Engineering Through Surface Through Surface Coilcraft Surface Hole Mount Hole Mount L23 33 1.40 67144090 67144470 RL-5471-7 — PE-53823 PE-53823-S DO3316-333 Mount L24 22 1.70 67148370 67148480 RL-1283-22-43 — PE-53824 PE-53824-S DO3316-223 L27 220 1.
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LM2675 www.ti.com SNVS129E – MAY 2004 – REVISED JUNE 2005 Table 3.
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LM2675 SNVS129E – MAY 2004 – REVISED JUNE 2005 www.ti.com Table 6. Diode Manufacturers' Phone Numbers International Rectifier Corp. Motorola, Inc. General Instruments Corp. Diodes, Inc. Phone (310) 322-3331 FAX (310) 322-3332 Phone (800) 521-6274 FAX (602) 244-6609 Phone (516) 847-3000 FAX (516) 847-3236 Phone (805) 446-4800 FAX (805) 446-4850 Figure 28. RMS Current Ratings for Low ESR Electrolytic Capacitors (Typical) Table 7.
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LM2675 www.ti.com SNVS129E – MAY 2004 – REVISED JUNE 2005 LM2675 Series Buck Regulator Design Procedure (Adjustable Output) PROCEDURE (Adjustable Output Voltage Version) EXAMPLE (Adjustable Output Voltage Version) To simplify the buck regulator design procedure, Texas Instruments is making available computer design software to be used with the SIMPLE SWITCHER line of switching regulators.LM267X Made Simpleversion 6.0 is available for use on Windows®3.1, NT, or 95 operating systems.
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LM2675 SNVS129E – MAY 2004 – REVISED JUNE 2005 www.ti.com PROCEDURE (Adjustable Output Voltage Version) EXAMPLE (Adjustable Output Voltage Version) B. Select an appropriate capacitor value and voltage rating, using the capacitor code, from the output capacitor selection table in Table 10. There are two solid tantalum (surface mount) capacitor manufacturers and four electrolytic (through hole) capacitor manufacturers to choose from.
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LM2675 www.ti.com SNVS129E – MAY 2004 – REVISED JUNE 2005 Table 9. Capacitor Code Selection Guide (1) Inductance (μH) Case Style (1) Output Voltage (V) 22 33 47 SM and TH 1.21–2.50 — — SM and TH 2.50–3.75 — — SM and TH 3.75–5.0 — SM and TH 5.0–6.25 — SM and TH 6.25–7.5 C8 C4 C7 C6 C6 C6 C6 SM and TH 7.5–10.0 C9 C10 C11 C12 C13 C13 C13 SM and TH 10.0–12.5 C14 C11 C12 C12 C13 C13 C13 SM and TH 12.5–15.0 C15 C16 C17 C17 C17 C17 C17 SM and TH 15.0–20.
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LM2675 SNVS129E – MAY 2004 – REVISED JUNE 2005 www.ti.com APPLICATION INFORMATION TYPICAL SURFACE MOUNT PC BOARD LAYOUT, FIXED OUTPUT (4X SIZE) CIN - 15 μF, 50V, Solid Tantalum Sprague, “594D series” COUT - 68 μF, 16V, Solid Tantalum Sprague, “594D series” D1 - 1A, 40V Schottky Rectifier, Surface Mount L1 - 33 μH, L23, Coilcraft DO3316 CB - 0.
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LM2675 www.ti.com SNVS129E – MAY 2004 – REVISED JUNE 2005 When using the adjustable version, special care must be taken as to the location of the feedback resistors and the associated wiring. Physically locate both resistors near the IC, and route the wiring away from the inductor, especially an open core type of inductor. WSON PACKAGE DEVICES The LM2675 is offered in the 16 lead WSON surface mount package to allow for increased power dissipation compared to the SOIC and PDIP.
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PACKAGE OPTION ADDENDUM www.ti.com 25-Feb-2014 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM2675LD-5.0 NRND WSON NHN 16 1000 TBD Call TI Call TI -40 to 125 S000FB LM2675LD-5.
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PACKAGE OPTION ADDENDUM www.ti.com 25-Feb-2014 Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (°C) Device Marking (4/5) LM2675MX-ADJ/NOPB ACTIVE SOIC D 8 2500 Green (RoHS & no Sb/Br) SN | CU SN Level-1-260C-UNLIM -40 to 125 2675 MADJ LM2675N-12/NOPB ACTIVE PDIP P 8 40 Green (RoHS & no Sb/Br) SN | CU SN Level-1-NA-UNLIM -40 to 125 LM2675 N-12 LM2675N-3.
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PACKAGE OPTION ADDENDUM www.ti.com 25-Feb-2014 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-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 LM2675LD-5.0 WSON NHN 16 1000 178.0 12.4 5.3 5.3 1.3 8.0 12.0 Q1 LM2675LD-5.0/NOPB WSON NHN 16 1000 178.0 12.4 5.3 5.3 1.3 8.0 12.0 Q1 LM2675LD-ADJ WSON NHN 16 1000 178.0 12.4 5.3 5.3 1.3 8.0 12.
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PACKAGE MATERIALS INFORMATION www.ti.com 23-Sep-2013 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) LM2675LD-5.0 WSON NHN 16 1000 210.0 185.0 35.0 LM2675LD-5.0/NOPB WSON NHN 16 1000 213.0 191.0 55.0 LM2675LD-ADJ WSON NHN 16 1000 210.0 185.0 35.0 LM2675LD-ADJ/NOPB WSON NHN 16 1000 213.0 191.0 55.0 LM2675LDX-ADJ/NOPB WSON NHN 16 4500 367.0 367.0 35.0 LM2675MX-12 SOIC D 8 2500 367.0 367.0 35.
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MECHANICAL DATA NHN0016A LDA16A (REV A) www.ti.
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