LM3674 - 2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5

LM3674 - 2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5 from the PowerWise® Family

Datasheet	Packaging	Samples & Pricing	Eval. Boards	Reliability	Application Notes	Knowledge Base

Features

•	600mA max load current
•	Input voltage range from 2.7V to 5.5V
•	Available in fixed and adjustable output voltages ranging from 1.0V to 3.3V
•	Operates from a single Li-Ion cell Battery
•	Internal synchronous rectification for high efficiency
•	Internal soft start
•	0.01 µA typical shutdown current
•	2 MHz PWM fixed switching frequency (typ)
•	SOT23-5 package
•	Current overload protection and Thermal shutdown protection

General Description

The LM3674 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. More...

Applications

•	Mobile phones
•	PDAs
•	MP3 players
•	Portable instruments
•	W-LAN
•	Digital still cameras
•	Portable Hard disk drives

Typical Application

click for larger image

Parameters Values

Output Current 600 mA

Input Min Voltage 2.7 Volt

Input Max Voltage 5.5 Volt

Output Min 1.8, 1.1, 1.875, 1.2, 2.8, 1.5 Volt

Output Max 1.8, 1.875, 1.2, 3.3, 2.8, 1.5 Volt

Frequency Min 2000 kHz

Frequency Max 2000 kHz

Efficiency (peak) 96 %

On/Off Pin Yes

Error Flag No

SoftStart Yes

Sync Pin No

Inverting No

Flyback No

RegType Switching Regulator

Temperature Min -30 deg C

Temperature Max 85 deg C

Adjustable Output No, Yes

Adj Switch Frequency No

PWM Mode Voltage with input feedforward

Topology Synchronous Buck

Special Features Pin-selectable PWM/PFM modes, Iq=15uA, 100% duty cycle, internal compensation, ceramic-cap stable, only 3 external components

Step-Down Yes

Multiple Output Capability No

Output Power Undefined Watt

Output Voltage 1.8, Undefined, 1.875, 1.2, 2.8, 1.5 Volt

Output Range Undefined

Switching Frequency 2000 kHz

Feedback Voltage Undefined Volt

Regulator Family Undefined

PowerWise Yes

Synchronous Rectification Yes

Typical Performance

click for larger image

WEBENCH Live Simulation!

LM3674
2.70 <=	V in Lower V	<=	V in Upper V	<= 5.50
V out	1.00 <=		V	<= 3.30
I out			A	<= 0.60
Ambient Temperature			°C	<= 100
What are WEBENCH® tools?

Also Recommended

LM3670▲	1 MHz Switching Frequency, 350mA Output Current, W/O PWM Mode
LM3671▲	2 MHz Switching Frequency, 600mA Output Current, W/O PWM Mode

Additional Resources

Application Notes

Block Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM3674 2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5	1102 Kbytes	13-Sep-06	Download
LM3674 2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5 (Japanese)	1307 Kbytes

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Qty

Qty

$US each

LM3674MF-1.5EV

2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5

Full production

N/A

Buy Now

1+

$55.00

1

6 weeks

N/A

LM3674MF-1.8EV

2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5

Full production

N/A

Buy Now

1+

$55.00

1

6 weeks

N/A

LM3674MF-ADJEV

2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5

Full production

N/A

Buy Now

1+

$55.00

1

6 weeks

N/A

LM3674MF-1.2

5

NOPB
STD

1
1

260
260

Full production

N/A

Samples

Buy Now

1K+

$0.95

reel
of
1000

6 weeks

1000

LM3674MF-1.5

5

NOPB

1

260

Full production

N/A

Samples

Buy Now

1K+

$0.95

reel
of
1000

6 weeks

50

LM3674MF-1.8

5

NOPB
STD

1
1

260
260

Full production

N/A

Samples

Buy Now

1K+

$0.95

reel
of
1000

6 weeks

2000

LM3674MF-1.875

5

NOPB

1

260

Full production

N/A

Samples

Buy Now

1K+

$0.95

reel
of
1000

12 weeks

50

LM3674MF-2.8

5

NOPB

1

260

Full production

N/A

Samples

Buy Now

1K+

$0.95

reel
of
1000

12 weeks

50

LM3674MF-ADJ

5

NOPB
STD

1
1

260
260

Full production

N/A

Samples

Buy Now

1K+

$0.95

reel
of
1000

6 weeks

2000

LM3674MFX-1.2

5

NOPB

1

260

Full production

N/A

Buy Now

1K+

$0.95

reel
of
3000

6 weeks

5000

LM3674MFX-1.5

5

NOPB

1

260

Full production

N/A

Buy Now

1K+

$0.95

reel
of
3000

12 weeks

N/A

LM3674MFX-1.8

5

NOPB

1

260

Full production

N/A

Buy Now

1K+

$0.95

reel
of
3000

6 weeks

5000

LM3674MFX-1.875

5

NOPB

1

260

Full production

N/A

Buy Now

1K+

$0.95

reel
of
3000

12 weeks

N/A

LM3674MFX-2.8

5

NOPB

1

260

Full production

N/A

Buy Now

1K+

$0.95

reel
of
3000

12 weeks

N/A

LM3674MFX-ADJ

5

NOPB

1

260

Full production

N/A

Buy Now

1K+

$0.95

reel
of
3000

12 weeks

N/A

General Description

The LM3674 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. It provides up to 600mA load current, over the entire input voltage range. There are several fixed output voltages and adjustable output voltage versions.

The device offers superior features and performance for mobile phones and similar portable systems. During PWM mode, the device operates at a fixed-frequency of 2 MHz (typ). Internal synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typ).

The LM3674 is available in SOT23-5 in leaded (PB) and lead-free (NO PB) versions. A high switching frequency of 2 MHz (typ) allows use of only three tiny external surface-mount components, an inductor and two ceramic capacitors.

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM3674MF-1.2	CMOS7	0	18406	0	0	1089000	4	309006723
LM3674MF-1.5	CMOS7	0	18406	0	0	1089000	4	309006723
LM3674MF-1.8	CMOS7	0	18406	0	0	1089000	4	309006723
LM3674MF-1.875	CMOS7	0	18406	0	0	1089000	4	309006723
LM3674MF-2.8	CMOS7	0	18406	0	0	1089000	4	309006723
LM3674MF-ADJ	CMOS7	0	18406	0	0	1089000	4	309006723
LM3674MFX-1.2	CMOS7	0	18406	0	0	1089000	4	309006723
LM3674MFX-1.5	CMOS7	0	18406	0	0	1089000	4	309006723
LM3674MFX-1.8	CMOS7	0	18406	0	0	1089000	4	309006723
LM3674MFX-1.875	CMOS7	0	18406	0	0	1089000	4	309006723
LM3674MFX-2.8	CMOS7	0	18406	0	0	1089000	4	309006723
LM3674MFX-ADJ	CMOS7	0	18406	0	0	1089000	4	309006723

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

Application Notes

Title	Size in Kbytes	Date
AN-1427: Application Note 1427 LM3674 Evaluation Board	4966 Kbytes	14-Oct-08	Download
AN-1427 (Chinese): Application Note 1427 LM3674 Evaluation Board	292 Kbytes

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More Application Notes

Title	Size in Kbytes	Date
AN-1682: Application Note 1682 LM3679TL Evaluation Board	3720 Kbytes	14-Oct-08	Download
AN-1395: Application Note 1395 LM3671 Evaluation Board	3838 Kbytes	10-Oct-08	Download
AN-1395 (Chinese): Application Note 1395 LM3671 Evaluation Board	321 Kbytes
AN-1465: Application Note 1465 LM3673 Evaluation Board	3717 Kbytes	10-Oct-08	Download
AN-1465 (Chinese): Application Note 1465 LM3673 Evaluation Board	269 Kbytes
AN-1595: Application Note 1595 LM3677 Evaluation Board	2801 Kbytes	14-Oct-08	Download
AN-1536: Application Note 1536 LM3676 Evaluation Board	417 Kbytes	14-Oct-08	Download
AN-1536 (Chinese): Application Note 1536 LM3676 Evaluation Board	278 Kbytes
AN-1722: Application Note 1722 LM3678 Evaluation Board	506 Kbytes	14-Oct-08	Download
AN-1348: Application Note 1348 LM3670 Evaluation Board	3906 Kbytes	9-Oct-08	Download
AN-1348 (Chinese): Application Note 1348 LM3670 Evaluation Board	257 Kbytes

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 7-Nov-2009]