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LM3670

Features: ` VOUT = adj (.7V min), 1.2, 1.5, 1.6, 1.8, 1.875, 2.5, 3.3V`2.5V VIN 5.5V` 15 µA typical quiescent current` 350 mA maximum load capability` 1 MHz PWM fixed switching frequency (typ.)` Automatic PFM/PWM mode switching`Available in fixed output voltages as well as an adjustable ve...

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SeekIC No. : 004395409 Detail

LM3670: Features: ` VOUT = adj (.7V min), 1.2, 1.5, 1.6, 1.8, 1.875, 2.5, 3.3V`2.5V VIN 5.5V` 15 µA typical quiescent current` 350 mA maximum load capability` 1 MHz PWM fixed switching frequency (ty...

LM3670 Data Sheet

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Part Number:
LM3670
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

` VOUT = adj (.7V min), 1.2, 1.5, 1.6, 1.8, 1.875, 2.5, 3.3V
`2.5V VIN 5.5V
` 15 µA typical quiescent current
` 350 mA maximum load capability
` 1 MHz PWM fixed switching frequency (typ.)
` Automatic PFM/PWM mode switching
`Available in fixed output voltages as well as an adjustable version
`SOT23-5 package
`Low drop out operation - 100% duty cycle mode
`Internal synchronous rectification for high efficiency
`Internal soft start
`0.1 µA typical shutdown current
`Operates from a single Li-Ion cell or 3 cell NiMH/NiCd batteries
`Only three tiny surface-mount external components required (one inductor, two ceramic capacitors)
`Current overload protection




Application

·Mobile phones
·Hand-Held Radios
·Personal Digital Assistants
·Palm-top PCs
·Portable Instruments
·Battery Powered Devices




Pinout

Connection Diagram




Specifications

Output Current 350 mA
Input Min Voltage 2.5 Volt
Input Max Voltage 5.5 Volt
Output Min 1.8, 0.7, 2.5, 1.875, 1.2, 3.3, 1.6, 1.5 Volt
Output Max 1.8, 2.5, 1.875, 1.2, 3.3, 1.6, 1.5 Volt
Frequency Min 1000 kHz
Frequency Max 1000 kHz
Efficiency (peak) 95 %
On/Off Pin Yes
Error Flag No
SoftStart Yes
Sync Pin No
Inverting No
Flyback No
RegType Switching Regulator
Temperature Min -40 deg C
Temperature Max 85 deg C
Adjustable Output No, Yes
Adj Switch Frequency No
PWM Mode Voltage with input feedfoward
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, 2.5, 1.875, 3.3, 1.6, 1.5 Volt
Output Range 0.7V to 3.3V
Switching Frequency 1000 kHz
Feedback Voltage Undefined Volt
Regulator Family Undefined
PowerWise Yes
Synchronous Rectification Yes
View Using Catalog


VIN Pin: Voltage to GND −0.2V to 6.0V
EN Pin: Voltage to GND −0.2V to 6.0V
FB, SW Pin: (GND−0.2V) to (VIN + 0.2V)
Junction Temperature (TJ-MAX)−45°C to +125°C
Storage Temperature Range −45°C to +150°C
Maximum Lead Temperature
(Soldering, 10 sec.)260°C
ESD Rating (Note 3)
Human Body Model:
VIN,SW,FB,GND2.0kV
EN 500V
Machine Model: 200V




Description

The LM3670 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 350 mA load current, over an input voltage range from 2.5V to 5.5V. There are several different fixed voltage output options available as well as an adjustable output voltage version (see ordering information).

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 full-power operation, a fixed-frequency 1 MHz (typ). PWM mode drives loads from [Similar_To]70 mA to 350 mA max, with up to 95% efficiency. Hysteretic PFM mode extends the battery life through reduction of the quiescent current to 15 µA (typ) during light current loads and system standby. Internal synchronous rectification provides high efficiency (90 to 95% typ. at loads between 1 mA and 100 mA). In shutdown mode (Enable pin pulled low) the device turns off and reduces battery consumption to 0.1 µA (typ.).

The LM3670 is available in a SOT23-5 package. A high switching frequency - 1 MHz (typ) - allows use of tiny surface-mount components. Only three external surface-mount components, an inductor and two ceramic capacitors, are required.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM3670MF-1.2 CMOS7 0 16561 0 0 954000 4 270700104
LM3670MF-1.5 CMOS7 0 16561 0 0 954000 4 270700104
LM3670MF-1.6 CMOS7 0 16561 0 0 954000 4 270700104
LM3670MF-1.8 CMOS7 0 16561 0 0 954000 4 270700104
LM3670MF-1.875 CMOS7 0 16561 0 0 954000 4 270700104
LM3670MF-2.5 CMOS7 0 16561 0 0 954000 4 270700104
LM3670MF-3.3 CMOS7 0 16561 0 0 954000 4 270700104
LM3670MF-ADJ CMOS7 0 16561 0 0 954000 4 270700104
LM3670MFX-1.2 CMOS7 0 16561 0 0 954000 4 270700104
LM3670MFX-1.5 CMOS7 0 16561 0 0 954000 4 270700104
LM3670MFX-1.6 CMOS7 0 16561 0 0 954000 4 270700104
LM3670MFX-1.8 CMOS7 0 16561 0 0 954000 4 270700104
LM3670MFX-1.875 CMOS7 0 16561 0 0 954000 4 270700104
LM3670MFX-3.3 CMOS7 0 16561 0 0 954000 4 270700104
LM3670MFX-ADJ CMOS7 0 16561 0 0 954000 4 270700104

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.


Design Tools

Title Size in Kbytes Date
Periodic steady-state and small-signal analyses of switching regulators View

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

Application Notes

Title Size in Kbytes Date
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 640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram">

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

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 640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram">
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 640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram">
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 640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram">
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 640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram">
AN-1722: Application Note 1722 LM3678 Evaluation Board 506 Kbytes 14-Oct-08 Download

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






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