LM3677   
3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits from the PowerWise® Family		 Click link to Download

Features
•16 µA typical quiescent current
•600 mA maximum load capability
•3 MHz PWM fixed switching frequency (typ.)
•Automatic PFM/PWM mode switching
•Available in 5-bump micro SMD package and 6-pin LLP package
•Internal synchronous rectification for high efficiency
•Internal soft start
•0.01 µA typical shutdown current
•Operates from a single Li-Ion cell battery
•Only three tiny surface-mount external components required (solution size less than 20 mm 2)
•Current overload and thermal shutdown protection

Description

The LM3677 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. It provides up to 600 mA load current over the entire input voltage range. The LM3677 is configured to different fixed voltage output options as well as an adjustable output voltage version range from 1.2V to 3.3V.

The device offers superior features and performance for mobile phones and similar portable applications with complex power management systems. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During PWM mode operation, the device operates at a fixed frequency of 3 MHz (typ). PWM mode drives loads from ~ 80 mA to 600 mA max. Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typ.) during light load and standby operation. Internal synchronous rectification provides high efficiency. In shutdown mode (Enable pin pulled down), the device turns off and reduces battery consumption to 0.01 µA (typ.).

The LM3677 is available in a lead-free (NOPB) 5-bump micro SMD package and 6-pin LLP package. A switching frequency of 3 MHz (typ.) allows use of tiny surface-mount components. Only three external surface-mount components, an inductor and two ceramic capacitors, are required.

Applications
•Mobile Phones
•PDAs
•MP3 Players
•W-LAN
•Portable Instruments
•Digital Still Cameras
•Portable Hard Disk Drives



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                                              LM3677
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Typical Application
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Block Diagram
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Typical Performance
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ParametersValues
Output Current 600 mA
Input Min Voltage 2.7 Volt
Input Max Voltage 5.5 Volt
Output Min 1.2 Volt
Output Max 3.3 Volt
Frequency Min 3000 kHz
Frequency Max 3000 kHz
Efficiency (peak) 93 %
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 Yes
Adj Switch Frequency No
PWM Mode Auto
Topology Synchronous Buck
Step-Down Yes
Multiple Output Capability No
Output Range 1.2V to 3.3V
Switching Frequency 3000 kHz
Feedback Voltage Undefined Volt
Regulator Family Undefined
PowerWise Yes
Synchronous Rectification Yes

Datasheet
TitleSizeDateOther
Language
LM3677 3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage Circuits8161
Kbytes		28-Oct-08日本語


Featured Application Notes
TitleSizeDateOther
Language
AN-1595: Application Note 1595 LM3677 Evaluation Board2801
Kbytes		14-Oct-08 


More Application Notes
TitleSizeDateOther
Language
AN-1682: Application Note 1682 LM3679TL Evaluation Board3720
Kbytes		14-Oct-08 
AN-1395: Application Note 1395 LM3671 Evaluation Board3838
Kbytes		10-Oct-08 中文
AN-1465: Application Note 1465 LM3673 Evaluation Board3717
Kbytes		10-Oct-08 中文
AN-1427: Application Note 1427 LM3674 Evaluation Board4966
Kbytes		14-Oct-08 中文
AN-1536: Application Note 1536 LM3676 Evaluation Board417
Kbytes		14-Oct-08 中文
AN-1722: Application Note 1722 LM3678 Evaluation Board506
Kbytes		14-Oct-08 
AN-1348: Application Note 1348 LM3670 Evaluation Board3906
Kbytes		9-Oct-08 中文

Part Number(s)
(NSID)		Top ViewAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3677LEE-1.2/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide472
$1.10 each at 1K+ pcsreel
of
250
LM3677LEE-1.5/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide500
$1.10 each at 1K+ pcsreel
of
250
LM3677LEE-1.8/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide554
$1.10 each at 1K+ pcsreel
of
250
LM3677LEE-1.82/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide500
$1.10 each at 1K+ pcsreel
of
250
LM3677LE-1.2/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
1000
LM3677LE-1.5/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
1000
LM3677LE-1.8/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
AVNET-EMWorldwide1000
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
1000
LM3677LE-1.82/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
1000
LM3677LEX-1.2/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
4500
LM3677LEX-1.5/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
4500
LM3677LEX-1.8/NOPB

RoHS

Full production
Lead Time: 12 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
4500
LM3677LEX-1.82/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
4500
LM3677TL-1.2/NOPB

RoHS

Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide139
$1.10 each at 1K+ pcsreel
of
250
LM3677TL-1.3/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide459
FARNELLEurope and Asia40
RS COMPONENTSWorldwide121
$1.10 each at 1K+ pcsreel
of
250
LM3677TL-1.5/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide709
FARNELLEurope and Asia40
RS COMPONENTSWorldwide245
$1.10 each at 1K+ pcsreel
of
250
LM3677TL-1.8/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide786
FARNELLEurope and Asia252
RS COMPONENTSWorldwide121
$1.10 each at 1K+ pcsreel
of
250
LM3677TL-1.875/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide500
$1.10 each at 1K+ pcsreel
of
250
LM3677TL-2.5/NOPB

RoHS

Full production
Lead Time: 6 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide605
FARNELLEurope and Asia275
RS COMPONENTSWorldwide120
$1.10 each at 1K+ pcsreel
of
250
LM3677TL-ADJ/NOPB

RoHS

Full production
Lead Time: 12 weeks

Samples
DistributorRegionQty
DIGIKEYWorldwide227
$1.10 each at 1K+ pcsreel
of
250
LM3677TLX-1.2/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
3000
LM3677TLX-1.3/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
3000
LM3677TLX-1.5/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
3000
LM3677TLX-1.8/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
3000
LM3677TLX-1.875/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
3000
LM3677TLX-2.5/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
3000
LM3677TLX-ADJ/NOPB

RoHS

Full production
Lead Time: 6 weeks

 
DistributorRegionQty
DIGIKEYWorldwide0
$1.10 each at 1K+ pcsreel
of
3000

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3677TL-1.8EV
3MHz, 600mA Miniature Step-Down DC-DC Converter for Ultra Low Voltage CircuitsFull production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide29
$97.00 each1

The LM3677 step-down DC-DC converter is optimized for powering ultra-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. The LM3677 is configured to four output voltages of 1.3V, 1.5V, 1.8V and 2.5V.

The device offers superior features and performance for mobile phones and similar portable applications with complex power management systems. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During PWM mode operation, the device operates at a fixed frequency of 3 MHz (typ). PWM mode drives loads from approximately 80mA to 600mA max. Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typ) during light load and standby operation. Internal synchronous rectification provides high efficiency. In shutdown mode (Enable pin pulled down), the device turns off and reduces battery consumption to 0.01 µA (typ).

The LM3677 evaluation board is a working demonstration of a step down DC-DC converter. The application note contains information about the evaluation board. For further information on buck converter topology, device electrical characteristics, and component seledtion please refer to the data. sheet.

Features:

  • 16 µA typical quiescent current
  • 600 mA maximum load capability
  • 3MHz PWM fixed switching frequency (typ)
  • Automatic PFM/PWM mode switching
  • Available in 5-bump micro SMD package
  • Internal synchronous rectification for high efficiency
  • Internal soft start
  • 0.01 µA typical shutdown current
  • Operates from a single Li-Ion cell battery
  • Only three tiny surface-mount external components required (solution size less than 20 mm2)
  • Current overload and Thermal shutdown protection

Applications:

  • Mobile Phones
  • PDAs
  • MP3 players
  • W-LAN
  • Portable Instruments
  • Digital still cameras
  • Portable Hard disk drives

Part Number(s)
(NSID)		DescriptionAvailabilityCurrent Reported StockBudgetary PricingStandard Pack Size
LM3677LE-1.8EV
LM3677LE-1.8 Evaluation BoardFull production


 
DistributorRegionQty
DIGIKEYWorldwide0
NATIONALWorldwide42
$97.00 each1

Description:

The LM3677 step-down DC-DC converter is optimized for powering ultra-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. The LM3677 is configured to different fixed voltage output options as well as an adjustable output voltage version range from 1.2 to 3.3V.

The LM3677 evaluation board is a working demonstration of a step down DC-DC converter. The application note contains information about the evaluation board. For further information on buck converter topology, device electrical characteristics, and component selection, please refer to the datasheet.

Features:

  • 16 µ A typical quiescent current
  • 600mA maximum load capability
  • 3 MHz PWM foxed switching frequency (typ.)
  • Automatic PFM/PWM mode switching
  • Available in 5-bump micro SMD package and 6-pin LLP package
  • Internal synchronous rectification for high efficiency
  • Internal soft start
  • 0.01 µ A typical shutdown current
  • Operates from a single Li-Ion cell battery
  • Only three tiny surface-mount external components required (solution size less than 20mm2)
  • Current overload and thermal shutdown protection

Applications:

  • Mobile Phones
  • PDAs
  • MP3 Players
  • W-LAN
  • Portable Instruments
  • Digital Still Cameras
  • Portable Hard disk drives

Part Number(s)
(NSID)		Top ViewTypePinsMSL RatingPeak ReflowRoHSCAD SymbolsModelsPackage
Marking
Format
LM3677LEE-1.2/NOPB
LLP61260RoHSN/AN/A
XVK
LM3677LEE-1.5/NOPB
LLP61260RoHSN/AN/A
XVL
LM3677LEE-1.8/NOPB
LLP61260RoHSN/AN/A
XVN
LM3677LEE-1.82/NOPB
LLP61260RoHSN/AN/A
XV5
LM3677LE-1.2/NOPB
LLP61260RoHSN/AN/A
XVK
LM3677LE-1.5/NOPB
LLP61260RoHSN/AN/A
XVL
LM3677LE-1.8/NOPB
LLP61260RoHSN/AN/A
XVN
LM3677LE-1.82/NOPB
LLP61260RoHSN/AN/A
XV5
LM3677LEX-1.2/NOPB
LLP61260RoHSN/AN/A
XVK
LM3677LEX-1.5/NOPB
LLP61260RoHSN/AN/A
XVL
LM3677LEX-1.8/NOPB
LLP61260RoHSN/AN/A
XVN
LM3677LEX-1.82/NOPB
LLP61260RoHSN/AN/A
XV5
LM3677TL-1.2/NOPB
MICRO SMD51260RoHSN/AN/A
XV
I 3
LM3677TL-1.3/NOPB
MICRO SMD51260RoHSN/AN/A
XV
I V
LM3677TL-1.5/NOPB
MICRO SMD51260RoHSN/AN/A
XV
I X
LM3677TL-1.8/NOPB
MICRO SMD51260RoHSN/AN/A
XV
I Y
LM3677TL-1.875/NOPB
MICRO SMD51260RoHSN/AN/A
XV
I 9
LM3677TL-2.5/NOPB
MICRO SMD51260RoHSN/AN/A
XV
I Z
LM3677TL-ADJ/NOPB
MICRO SMD51260RoHSN/AN/A
XV
I 4
LM3677TLX-1.2/NOPB
MICRO SMD51260RoHSN/AN/A
XV
I 3
LM3677TLX-1.3/NOPB
MICRO SMD51260RoHSN/AN/A
XV
I V
LM3677TLX-1.5/NOPB
MICRO SMD51260RoHSN/AN/A
XV
I X
LM3677TLX-1.8/NOPB
MICRO SMD51260RoHSN/AN/A
XV
I Y
LM3677TLX-1.875/NOPB
MICRO SMD51260RoHSN/AN/A
XV
I 9
LM3677TLX-2.5/NOPB
MICRO SMD51260RoHSN/AN/A
XV
I Z
LM3677TLX-ADJ/NOPB
MICRO SMD51260RoHSN/AN/A
XV
I 4

Reliability Metrics
Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM3677LE-1.2CMOS70184060010890004309006723
LM3677LE-1.5CMOS70184060010890004309006723
LM3677LE-1.8CMOS70184060010890004309006723
LM3677LE-1.82CMOS70184060010890004309006723
LM3677LEE-1.2CMOS70184060010890004309006723
LM3677LEE-1.5CMOS70184060010890004309006723
LM3677LEE-1.8CMOS70184060010890004309006723
LM3677LEE-1.82CMOS70184060010890004309006723
LM3677LEX-1.2CMOS70184060010890004309006723
LM3677LEX-1.5CMOS70184060010890004309006723
LM3677LEX-1.8CMOS70184060010890004309006723
LM3677LEX-1.82CMOS70184060010890004309006723
LM3677TL-1.2CMOS70184060010890004309006723
LM3677TL-1.3CMOS70184060010890004309006723
LM3677TL-1.5CMOS70184060010890004309006723
LM3677TL-1.8CMOS70184060010890004309006723
LM3677TL-1.875CMOS70184060010890004309006723
LM3677TL-2.5CMOS70184060010890004309006723
LM3677TL-ADJCMOS70184060010890004309006723
LM3677TLX-1.2CMOS70184060010890004309006723
LM3677TLX-1.3CMOS70184060010890004309006723
LM3677TLX-1.5CMOS70184060010890004309006723
LM3677TLX-1.8CMOS70184060010890004309006723
LM3677TLX-1.875CMOS70184060010890004309006723
LM3677TLX-2.5CMOS70184060010890004309006723
LM3677TLX-ADJCMOS70184060010890004309006723

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.


[Information as of 21-Nov-2009]