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LM2674

www.ti.com

SNVS007F –SEPTEMBER 1998–REVISED APRIL 2013

LM2674 SIMPLE SWITCHER

Power Converter High Efficiency

500 mA Step-Down Voltage Regulator

Check for Samples: LM2674

FEATURES

DESCRIPTION

The LM2674 series of regulators are monolithic

234

• Efficiency up to 96%

integrated circuits built with a LMDMOS process.

• Available in SOIC-8, 8-Pin PDIP and WSON

These regulators provide all the active functions for a

Packages

step-down (buck) switching regulator, capable of

• Computer Design Software LM267X Made

driving a 500 mA load current with excellent line and

load regulation. These devices are available in fixed

Simple (Version 6.0)

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

• Simple and Easy to Design With

output 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 LM2674 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

• Guaranteed 500mA 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

LM2674 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.

TYPICAL APPLICATIONS

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

(Buck) Regulator

• Efficient Pre-Regulator for Linear Regulators

• Positive-to-Negative Converter

Typical Application

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 (31 pages)

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LM2674 www.ti.com SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 LM2674 SIMPLE SWITCHER® Power Converter High Efficiency 500 mA Step-Down Voltage Regulator Check for Samples: LM2674 FEATURES DESCRIPTION • Efficiency up to 96% • Available in SOIC-8, 8-Pin PDIP and WSON Packages • 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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LM2674 SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 www.ti.com DESCRIPTION (CONTINUED) Other features include an ensured ±1.5% tolerance on output voltage within specified input voltages and output load conditions, and ±10% on the oscillator frequency. External shutdown is included, featuring typically 50 μA stand-by current. The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions.
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LM2674 www.ti.com SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 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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LM2674 SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 www.ti.com LM2674-5.0 Symbol Parameter Conditions SYSTEM PARAMETERSTest Circuit Figure 22 Typical (1) Min (2) Max (2) Units (3) VOUT Output Voltage VIN = 8V to 40V, ILOAD = 20 mA to 500 mA 5.0 4.925/4.850 5.075/5.150 V VOUT Output Voltage VIN = 6.5V to 40V, ILOAD = 20 mA to 250 mA 5.0 4.925/4.850 5.075/5.
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LM2674 www.ti.com SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 All Output Voltage Versions 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 Typ Min Max Units 3.6 mA DEVICE PARAMETERS IQ Quiescent Current VFEEDBACK = 8V For 3.3V, 5.
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LM2674 SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 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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LM2674 www.ti.com SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 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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LM2674 SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 www.ti.com Typical Performance Characteristics (continued) 8 Dropout Voltage—3.3V Option Dropout Voltage—5.0V Option Figure 15. Figure 16.
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LM2674 www.ti.com SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 Typical Performance Characteristics (Circuit of Figure 22) Continuous Mode Switching Waveforms VIN = 20V, VOUT = 5V, ILOAD = 500 mA L = 100 μH, COUT = 100 μF, COUTESR = 0.1Ω A: VSW Pin Voltage, 10 V/div. B: Inductor Current, 0.2 A/div C: Output Ripple Voltage, 50 mV/div AC-Coupled Figure 17. Horizontal Time Base: 1 μs/div Load Transient Response for Continuous Mode VIN = 20V, VOUT = 5V, L = 100 μH, COUT = 100 μF, COUTESR = 0.
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LM2674 SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 www.ti.com Block Diagram * Active Inductor Patent Number 5,514,947 † Active Capacitor Patent Number 5,382,918 Figure 21. 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.
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LM2674 www.ti.com SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 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 R1 - 1.5 kΩ, 1% CB - 0.01 μF, 50V Ceramic For a 5V output, select R2 to be 4.75 kΩ, 1% where VREF = 1.21V Use a 1% resistor for best stability. Figure 23.
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LM2674 SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 www.ti.com PROCEDURE (Fixed Output Voltage Version) EXAMPLE (Fixed Output Voltage Version) Renco: ferrite stick core inductors; benefits are typically lowest cost inductors and can withstand E•T and transient peak currents above rated value. Be aware that these inductors have an external magnetic field which may generate more EMI than other types of inductors.
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LM2674 www.ti.com SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 PROCEDURE (Fixed Output Voltage Version) EXAMPLE (Fixed Output Voltage Version) A low ESR aluminum or tantalum bypass capacitor is needed between the input pin and ground to prevent large voltage transients from appearing at the input. This capacitor should be located close to the IC using short leads. In addition, the RMS current rating of the input capacitor should be selected to be at least ½ the DC load current.
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LM2674 SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 www.ti.com Table 1. Inductor Manufacturers' Part Numbers Schott Renco Pulse Engineering Coilcraft Ind. Ref. Desg. Inductan ce (μH) Current (A) Through Hole Mount Hole Mount L2 150 0.21 67143920 67144290 RL-5470-4 RL1500-150 PE-53802 PE-53802-S DO1608-154 L3 100 0.26 67143930 RL-5470-5 RL1500-100 PE-53803 PE-53803-S DO1608-104 L4 68 0.
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LM2674 www.ti.com SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 Table 3. Output Capacitor Table Output Capacitor Output Voltage (V) 3.3 5.0 12 Surface Mount Inductance (μH) Through Hole Sprague AVX TPS Sanyo OS-CON Sanyo MV-GX Nichicon Panasonic 594D Series Series SA Series Series PL Series HFQ Series (μF/V) (μF/V) (μF/V) (μF/V) (μF/V) (μF/V) 22 120/6.3 100/10 100/10 330/35 330/35 330/35 33 120/6.
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LM2674 SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 www.ti.com Table 5.
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LM2674 www.ti.com SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 Table 7. AVX TPS (1) Recommended Application Voltage Voltage Rating +85°C Rating (1) 3.3 6.3 5 10 10 20 12 25 15 35 Recommended Application Voltage for AVX TPS and Sprague 594D Tantalum Chip Capacitors Derated for 85°C Table 8. Sprague 594D (1) Recommended Application Voltage Voltage Rating +85°C Rating (1) 2.5 4 3.3 6.
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LM2674 SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 www.ti.com LM2674 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 SWITCHERline of switching regulators.LM267X Made Simple (version 6.0) is available for use on Windows 3.1, NT, or 95 operating systems.
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LM2674 www.ti.com SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 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 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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LM2674 SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 www.ti.com 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.
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LM2674 www.ti.com SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 APPLICATION INFORMATION TYPICAL SURFACE MOUNT PC BOARD LAYOUT, FIXED OUTPUT (4X SIZE) CIN - 15 μF, 25V, Solid Tantalum Sprague, “594D series” COUT - 68 μF, 10V, Solid Tantalum Sprague, “594D series” D1 - 1A, 40V Schottky Rectifier, Surface Mount L1 - 47 μH, L13, Coilcraft DO3308 CB - 0.
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LM2674 SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 www.ti.com Layout is very important in switching regulator designs. Rapidly switching currents associated with wiring inductance can generate voltage transients which can cause problems. For minimal inductance and ground loops, the wires indicated by heavy lines (in Figure 22 and Figure 23) should be wide printed circuit traces and should be kept as short as possible.
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LM2674 www.ti.com SNVS007F – SEPTEMBER 1998 – REVISED APRIL 2013 REVISION HISTORY Changes from Revision E (April 2013) to Revision F • Page Changed layout of National Data Sheet to TI format ..........................................................................................................
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PACKAGE OPTION ADDENDUM www.ti.com 1-Nov-2013 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) LM2674LD-3.3/NOPB ACTIVE WSON NHN 16 1000 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 S000AB LM2674LD-ADJ/NOPB ACTIVE WSON NHN 16 1000 Green (RoHS & no Sb/Br) CU SN Level-3-260C-168 HR -40 to 125 S000CB LM2674LDX-5.
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PACKAGE OPTION ADDENDUM www.ti.com Orderable Device 1-Nov-2013 Status (1) LM2674N-ADJ/NOPB ACTIVE Package Type Package Pins Package Drawing Qty PDIP P 8 40 Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Green (RoHS & no Sb/Br) SN | CU SN Level-1-NA-UNLIM Op Temp (°C) Device Marking (4/5) -40 to 125 LM2674 N-ADJ (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs.
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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 LM2674LD-3.3/NOPB WSON NHN 16 1000 178.0 12.4 5.3 5.3 1.3 8.0 12.0 Q1 LM2674LD-ADJ/NOPB WSON NHN 16 1000 178.0 12.4 5.3 5.3 1.3 8.0 12.0 Q1 LM2674LDX-5.0/NOPB WSON NHN 16 4500 330.0 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) LM2674LD-3.3/NOPB WSON NHN 16 1000 213.0 191.0 55.0 LM2674LD-ADJ/NOPB WSON NHN 16 1000 213.0 191.0 55.0 LM2674LDX-5.0/NOPB WSON NHN 16 4500 367.0 367.0 35.0 LM2674MX-12/NOPB SOIC D 8 2500 367.0 367.0 35.0 LM2674MX-3.3/NOPB SOIC D 8 2500 367.0 367.0 35.0 LM2674MX-5.0/NOPB SOIC D 8 2500 367.
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MECHANICAL DATA NHN0016A LDA16A (REV A) www.ti.
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