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

Parametric Table expand

Parametric Table collapse

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

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

View Using Catalog

Additional Resources

Application Notes (see below)

Block Diagram

*click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
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 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

Weeks

Qty

$US each

LP3905SD-30EV

Power Management Unit For Low Power Handheld Applications

Full production

N/A

$61.00

6 weeks

N/A

LP3905SD-A3EV

LP3905SD-A3EV Evaluation Board

Full production

N/A

$61.00

6 weeks

N/A

LP3905SD-00

LLP

NOPB

260

RoHS

Download

Full production

N/A

1K+

$1.60

reel
of
1000

NS
UZXYTT
3905-00

12 weeks

2000

LP3905SD-30

LLP

NOPB

260

RoHS

Download

Full production

N/A

1K+

$1.60

reel
of
1000

NS
UZXYTT
3905-30

6 weeks

2000

LP3905SD-A3

LLP

STD

NOPB

260

RoHS

Download

Full production

N/A

1K+

$1.60

reel
of
1000

NS
UZXYTT
3905-A3

12 weeks

2000

LP3905SDX-00

LLP

NOPB

260

RoHS

Download

Full production

N/A

1K+

$1.60

reel
of
4500

NS
UZXYTT
3905-00

12 weeks

N/A

LP3905SDX-30

LLP

NOPB

260

RoHS

Download

Full production

N/A

1K+

$1.60

reel
of
4500

NS
UZXYTT
3905-30

6 weeks

N/A

LP3905SDX-A3

LLP

NOPB

260

RoHS

Download

Full production

N/A

1K+

$1.60

reel
of
4500

NS
UZXYTT
3905-A3

12 weeks

N/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-00	CMOS7	0	16561	0	0	954000	4	270700104
LP3905SD-30	CMOS7	0	16561	0	0	954000	4	270700104
LP3905SD-A3	CMOS7	0	16561	0	0	954000	4	270700104
LP3905SDX-00	CMOS7	0	16561	0	0	954000	4	270700104
LP3905SDX-30	CMOS7	0	16561	0	0	954000	4	270700104
LP3905SDX-A3	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.

Application Notes

Title	Size in Kbytes	Date
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

Title	Size in Kbytes	Date
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

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[Information as of 5-Jul-2009]