LM2675M-3.3 National Semiconductor, LM2675M-3.3 Datasheet

LM2675M-3.3

Manufacturer Part Number

LM2675M-3.3

Description

DC/DC Converter IC

Manufacturer

National Semiconductor

Datasheet

1.LM2675M-3.3.pdf (26 pages)

Specifications of LM2675M-3.3

Input Voltage

40V

Output Current

Output Voltage

3.3V

No. Of Pins

Mounting Type

Surface Mount

Voltage Regulator Type

Buck Switching

Supply Voltage Min

6.5V

Output Current Max

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

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LM2675

SIMPLE SWITCHER

1A Step-Down Voltage Regulator

General Description

The LM2675 series of regulators are monolithic integrated

circuits built with a LMDMOS process. These regulators

provide all the active functions for a step-down (buck)

switching regulator, capable of driving a 1A load current with

excellent line and load regulation. These devices are avail-

able in fixed output voltages of 3.3V, 5.0V, 12V, and an

adjustable output version.

Requiring a minimum number of external components, these

regulators are simple to use and include patented internal

frequency compensation (Patent Nos. 5,382,918 and

5,514,947) and a fixed frequency oscillator.

The LM2675 series operates at a switching frequency of

260 kHz, thus allowing smaller sized filter components than

what would be needed with lower frequency switching regu-

lators. Because of its very high efficiency (

per traces on the printed circuit board are the only heat

sinking needed.

A family of standard inductors for use with the LM2675 are

available from several different manufacturers. This feature

greatly simplifies the design of switch-mode power supplies

using these advanced ICs. Also included in the datasheet

are selector guides for diodes and capacitors designed to

work in switch-mode power supplies.

Other features include a guaranteed

output voltage within specified input voltages and output

load conditions, and

ternal 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.

Typical Application

SIMPLE SWITCHER

Windows

is a registered trademark of Microsoft Corporation.

is a registered trademark of National Semiconductor Corporation.

10% on the oscillator frequency. Ex-

DS012803

1.5% tolerance on

90%), the cop-

Power Converter High Efficiency

To simplify the LM2675 buck regulator design procedure,

there exists computer design software, LM267X Made

Simple version 6.0.

Features

n Efficiency up to 96%

n Available in SO-8, 8-pin DIP and LLP packages

n Computer Design Software LM267X Made Simple

n Simple and easy to design with

n Requires only 5 external components

n Uses readily available standard inductors

n 3.3V, 5.0V, 12V, and adjustable output versions

n Adjustable version output voltage range: 1.21V to 37V

n Guaranteed 1A output load current

n 0.25Ω DMOS Output Switch

n Wide input voltage range: 8V to 40V

n 260 kHz fixed frequency internal oscillator

n TTL shutdown capability, low power standby mode

n Thermal shutdown and current limit protection

Typical Applications

n Simple High Efficiency (

n Efficient Pre-Regulator for Linear Regulators

n Positive-to-Negative Converter

(version 6.0)

conditions

Regulator

1.5% max output voltage tolerance over line and load

90%) Step-Down (Buck)

01280301

www.national.com

June 2005

Related parts for LM2675M-3.3

LM2675M-3.3 Summary of contents

Page 1

... The output switch includes current limiting, as well as thermal shutdown for full protection under fault conditions. Typical Application SIMPLE SWITCHER ® registered trademark of National Semiconductor Corporation. Windows ® registered trademark of Microsoft Corporation. © 2005 National Semiconductor Corporation Power Converter High Efficiency ® ...

Page 2

... Package Marking LM2675LD-12 S000DB LM2675LDX-12 S000DB LM2675LD-3.3 S000EB LM2675LDX-3.3 S000EB LM2675LD-5.0 S000FB LM2675LDX-5.0 S000FB LM2675LD-ADJ S000GB LM2675LDX-ADJ S000GB LM2675M-12 2675M-12 LM2675MX-12 2675M-12 LM2675M-3.3 2675M-3.3 LM2675MX-3.3 2675M-3.3 LM2675M-5.0 2675M-5.0 LM2675MX-5.0 2675M-5.0 LM2675M-ADJ 2675M-ADJ LM2675MX-ADJ 2675M-ADJ LM2675N-12 LM2675N-12 LM2675N-3.3 LM2675N-3.3 LM2675N-5.0 LM2675N-5.0 LM2675N-ADJ LM2675N-ADJ 2 ...

Page 3

... Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage ON/OFF Pin Voltage Switch Voltage to Ground Boost Pin Voltage Feedback Pin Voltage ESD Susceptibility Human Body Model (Note 2) Power Dissipation ...

Page 4

LM2675-ADJ (Continued) Symbol Parameter η Efficiency V = 12V All Output Voltage Versions Specifications with standard type face are for T ture Range. Unless otherwise specified, V sion, and I = 100 mA. LOAD Symbol Parameters DEVICE PARAMETERS ...

Page 5

Typical Performance Characteristics Normalized Output Voltage Efficiency Switch Current Limit 01280303 01280305 01280307 5 Line Regulation 01280304 Drain-to-Source Resistance 01280306 Operating Quiescent Current 01280308 www.national.com ...

Page 6

Typical Performance Characteristics Standby Quiescent Current ON/OFF Pin Current (Sourcing) Feedback Pin Bias Current www.national.com (Continued) 01280309 01280311 01280313 6 ON/OFF Threshold Voltage 01280310 Switching Frequency 01280312 Peak Switch Current 01280314 ...

Page 7

Typical Performance Characteristics Dropout Voltage — 3.3V Option Block Diagram * Active Inductor Patent Number 5,514,947 † Active Capacitor Patent Number 5,382,918 (Continued) Dropout Voltage — 5.0V Option 01280315 FIGURE 1. 7 01280316 01280317 www.national.com ...

Page 8

Typical Performance Characteristics Continuous Mode Switching Waveforms V = 20V 5V OUT µ µF, C OUT A: V Pin Voltage, 10 V/div Inductor Current, 0.5 A/div C: Output ...

Page 9

Test Circuit and Layout Guidelines µF, 50V Tantalum, Sprague “199D Series” µF, 25V Tantalum, Sprague “595D Series” OUT D1 - 3.3A, 50V Schottky Rectifier, IR 30WQ05F µH Sumida # RCR110D-680L ...

Page 10

LM2675 Series Buck Regulator Design Procedure (Fixed Output) PROCEDURE (Fixed Output Voltage Version) To simplify the buck regulator design procedure, National Semiconductor is making available computer design software to be used with the SIMPLE SWITCHER line of switching regulators. LM267X ...

Page 11

LM2675 Series Buck Regulator Design Procedure (Fixed Output) PROCEDURE (Fixed Output Voltage Version) The capacitor list contains through-hole electrolytic capacitors from four different capacitor manufacturers and surface mount tantalum capacitors from two different capacitor manufacturers recommended that both ...

Page 12

LM2675 Series Buck Regulator Design Procedure (Fixed Output) PROCEDURE (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 ...

Page 13

LM2675 Series Buck Regulator Design Procedure (Fixed Output) Inductor Value Selection Guides (For Continuous Mode Operation) FIGURE 4. LM2675-3.3 FIGURE 5. LM2675-5.0 01280326 FIGURE 6. LM2675-12 01280327 FIGURE 7. LM2675-ADJ 13 (Continued) 01280328 01280329 www.national.com ...

Page 14

LM2675 Series Buck Regulator Design Procedure (Fixed Output) Ind. Inductance Current Ref. Through (µH) (A) Desg. Hole L4 68 0.32 67143940 67144310 L5 47 0.37 67148310 67148420 L6 33 0.44 67148320 67148430 L7 22 0.52 67148330 67148440 L9 220 0.32 ...

Page 15

LM2675 Series Buck Regulator Design Procedure (Fixed Output) Surface Mount Output Inductance Voltage Sprague (µH) (V) 594D Series (µF/V) 22 120/6.3 33 120/6.3 47 68/10 3.3 68 120/6.3 100 120/6.3 150 120/6.3 22 100/16 33 68/10 47 68/10 5.0 68 ...

Page 16

LM2675 Series Buck Regulator Design Procedure (Fixed Output) 20V 30V 40V 50V International Rectifier Corp. Motorola, Inc. General Instruments Corp. Diodes, Inc. FIGURE 14. RMS Current Ratings for Low ESR Electrolytic Capacitors (Typical) www.national.com 1A Diodes 3A Diodes V Surface ...

Page 17

LM2675 Series Buck Regulator Design Procedure (Fixed Output) LM2675 Series Buck Regulator Design Procedure (Adjustable Output) PROCEDURE (Adjustable Output Voltage Version) To simplify the buck regulator design procedure, National Semiconductor is making available computer design software to be used with ...

Page 18

LM2675 Series Buck Regulator Design Procedure (Adjustable Output) (Continued) PROCEDURE (Adjustable Output Voltage Version) 2. Inductor Selection (L1) A. Calculate the inductor Volt • microsecond constant E • • µs), from the following formula: where V = internal ...

Page 19

LM2675 Series Buck Regulator Design Procedure (Adjustable Output) (Continued) PROCEDURE (Adjustable Output Voltage Version) 4. Catch Diode Selection (D1 normal operation, the average current of the catch diode is the load current times the catch diode duty cycle, ...

Page 20

LM2675 Series Buck Regulator Design Procedure (Adjustable Output) (Continued) Case Output Style (Note 7) Voltage (V) 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 SM and TH 7.5–10.0 ...

Page 21

LM2675 Series Buck Regulator Design Procedure (Adjustable Output) (Continued) Surface Mount Cap. Sprague AVX TPS Ref. Desg. 594D Series Series # (µF/V) (µF/V) C1 120/6.3 100/10 C2 120/6.3 100/10 C3 120/6.3 100/10 C4 68/10 100/10 C5 100/16 100/10 C6 100/16 ...

Page 22

Application Information TYPICAL SURFACE MOUNT PC BOARD LAYOUT, FIXED OUTPUT (4X SIZE µF, 50V, Solid Tantalum Sprague, “594D series” µF, 16V, Solid Tantalum Sprague, “594D series” OUT D1 - 1A, 40V Schottky Rectifier, ...

Page 23

Application Information 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 ...

Page 24

... Physical Dimensions unless otherwise noted 8-Lead (0.150" Wide) Molded Small Outline Package, JEDEC www.national.com inches (millimeters) Order Number LM2675M-3.3, LM2675M-5.0, LM2675M-12 or LM2675M-ADJ NS Package Number M08A 24 ...

Page 25

Physical Dimensions inches (millimeters) unless otherwise noted (Continued) 8-Lead (0.300" Wide) Molded Dual-In-Line Package Order Number LM2675N-3.3, LM2675N-5.0, LM2675N-12 or LM2675N-ADJ NS Package Number N08E 25 www.national.com ...

Page 26

... BANNED SUBSTANCE COMPLIANCE National Semiconductor manufactures products and uses packing materials that meet the provisions of the Customer Products Stewardship Specification (CSP-9-111C2) and the Banned Substances and Materials of Interest Specification (CSP-9-111S2) and contain no ‘‘Banned Substances’’ as defined in CSP-9-111S2. ...

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