LP3905 - Power Management Unit For Low Power Handheld Applications
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Application Notes Knowledge Base

Features
•Two buck regulators for powering high current processor functions or peripheral devices
•Two linear regulators for powering internal processor functions and I/Os
•One enable pin for Buck1 and Linear Regulators 1 & 2
•Separate enable pin for Buck2
•Thermal and current overload protection
•Small 14-Pin LLP package (4mm x 4mm x 0.8mm)

General Description

LP3905 is a multi-functional Power Management Unit, optimized for low power handheld applications. More...


Applications

•Baseband Processors
•Peripheral Processor (Video, Audio)
•I/O Power
•FPGA Power
  Typical Application
*click for larger image


ParametersValues
Input Min Voltage 3 Volt
Input Max Voltage 5.5 Volt
Output Range LDOs: 1.5 to 3.3V; Buck: 1 to 3.3V
Channels 4 Channels
Dropout Voltage 0.08 Volt
Feedback Tolerance 3 %
Output1 VoutMin 1.2, 0.5 Volt
Output1 VoutMax 1.2, 3.3 Volt
Output1 IoutMax 600 mA
Output1 Topology Buck
Output2 VoutMin 1.875 Volt
Output2 VoutMax 1.876 Volt
Output2 IoutMax 600 mA
Output2 Topology Buck
Output3 VoutMin 2.8
Output3 VoutMax 2.8 Volt
Output3 IoutMax 150 mA
Output3 Topology LDO
Output4 VoutMin 2.8 Volt
Output4 VoutMax 2.8 Volt
Output4 IoutMax 150 mA
Output4 Topology LDO
Special Features 2 LDO regulators, 2 buck regulators
Topology Buck, LDO
Switching Frequency 2000 kHz
Adj Switch Frequency Yes
Sync Pin No
RegType Power Management Unit
Step-Down Yes
Step-Up No
Inverting No
Flyback No
Efficiency (peak) 90 %
Adjustable Output Yes
Error Flag Yes
On/Off Pin Yes
Multiple Output Capability Yes
Temperature Min -40 deg C
Temperature Max 85 deg C

  Additional Resources
Application Notes


Block Diagram

*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LP3905 Power Management Unit For Low Power Handheld Applications 684
Kbytes		 24-Aug-06 Download

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


Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LP3905SD-30EVPower Management Unit For Low Power Handheld ApplicationsFull productionN/A
 
Buy Now 		1+$61.001-
6 weeksN/A
LP3905SD-A3EVLP3905SD-A3EV Evaluation BoardFull productionN/A
 
Buy Now 		1+$61.001-
6 weeksN/A
LP3905SD-00LLP14NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.60reel
of
1000		NS
UZXYTT
3905-00
12 weeks2000
LP3905SD-30LLP14NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.60reel
of
1000		NS
UZXYTT
3905-30
6 weeks2000
LP3905SD-A3LLP14NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.60reel
of
1000		NS
UZXYTT
3905-A3
12 weeks2000
LP3905SDX-00LLP14NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.60reel
of
4500		NS
UZXYTT
3905-00
12 weeksN/A
LP3905SDX-30LLP14NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.60reel
of
4500		NS
UZXYTT
3905-30
6 weeksN/A
LP3905SDX-A3LLP14NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.60reel
of
4500		NS
UZXYTT
3905-A3
12 weeksN/A

General Description

LP3905 is a multi-functional Power Management Unit, optimized for low power handheld applications. This device integrates two 600mA DC/DC buck regulators and two 150mA linear regulators. Fixed and adjustable buck output versions are available. The LP3905 additionally features two enable pins for the device output control and is offered in an LLP package.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LP3905SD-00CMOS70184060010890004309006723
LP3905SD-30CMOS70184060010890004309006723
LP3905SD-A3CMOS70184060010890004309006723
LP3905SDX-00CMOS70184060010890004309006723
LP3905SDX-30CMOS70184060010890004309006723
LP3905SDX-A3CMOS70184060010890004309006723

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

TitleSize in Kbytes Date Click link below to Download
AN-1527: Application Note 1527 LP3905-A3 Application Board Information 158
Kbytes		 5-Nov-07 Download
AN-1527 (Chinese): Application Note 1527 LP3905-A3 Application Board Information
 212 Kbytes  
AN-1501: Application Note 1501 LP3905-30 Application Board Information 189
Kbytes		 7-Mar-07 Download
AN-1501 (Chinese): Application Note 1501 LP3905-30 Application Board Information
 180 Kbytes  

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More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1532: Application Note 1532 LP3906 Evaluation Kit 5066
Kbytes		 16-Mar-07 Download
AN-1619: Application Note 1619 Evaluation Kit for LP3907 — Programmable Power Management Unit with 1 2 C Compatible Interface 8282
Kbytes		 4-Sep-07 Download
AN-1619 (Chinese): Application Note 1619 Evaluation Kit for LP3907 — Programmable Power Management Unit with 1 2 C Compatible Interface
 1278 Kbytes  

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

[Information as of 7-Nov-2009]