LP3905 - Power Management Unit For Low Power Handheld Applications

LP3905

Power Management Unit For Low Power Handheld Applications

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Reliability

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)

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.

Applications

• Baseband Processors

• Peripheral Processor (Video, Audio)

• I/O Power

• FPGA Power

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LP3905

Typical Application *click for larger image

Block Diagram *click for larger image

Parameters Values

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

Datasheet
Title Size Date Other
Language

LP3905 Power Management Unit For Low Power Handheld Applications 684
Kbytes 24-Aug-06

Featured Application Notes
Title Size Date Other
Language

AN-1527: Application Note 1527 LP3905-A3 Application Board Information 158
Kbytes 5-Nov-07 中文

AN-1501: Application Note 1501 LP3905-30 Application Board Information 189
Kbytes 7-Mar-07 中文

More Application Notes
Title Size Date Other
Language

AN-1532: Application Note 1532 LP3906 Evaluation Kit 5066
Kbytes 16-Mar-07

AN-1619: Application Note 1619 Evaluation Kit for LP3907 — Programmable Power Management Unit with 1 2 C Compatible Interface 8282
Kbytes 4-Sep-07 中文

Part Number(s)
(NSID)

Top View

Availability

Current Reported Stock

Budgetary Pricing

Standard Pack Size

LP3905SD-00/NOPB

RoHS

Full production
Lead Time: 12 weeks

Distributor	Region	Qty
DIGIKEY	Worldwide	1994
FARNELL	Europe and Asia	100
RS COMPONENTS	Worldwide	25

$1.60 each at 1K+ pcs

reel
of
1000

LP3905SD-30/NOPB

RoHS

Full production
Lead Time: 6 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	0

$1.60 each at 1K+ pcs

reel
of
1000

LP3905SD-A3/NOPB
LP3905SD-A3

RoHS

Full production
Lead Time: 12 weeks

Distributor	Region	Qty
DIGIKEY	Worldwide	843
FUTURE	Worldwide	1100
KEIKONG	Asia Pacific	1000

$1.60 each at 1K+ pcs

reel
of
1000

LP3905SDX-00/NOPB

RoHS

Full production
Lead Time: 12 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	0

$1.60 each at 1K+ pcs

reel
of
4500

LP3905SDX-30/NOPB

RoHS

Full production
Lead Time: 6 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	0

$1.60 each at 1K+ pcs

reel
of
4500

LP3905SDX-A3/NOPB

RoHS

Full production
Lead Time: 12 weeks

Distributor		Region	Qty
DIGIKEY		Worldwide	0

$1.60 each at 1K+ pcs

reel
of
4500

Part Number(s)
(NSID)

Description

Availability

Current Reported Stock

Budgetary Pricing

Standard Pack Size

LP3905SD-30EV

Power Management Unit For Low Power Handheld Applications

Full production

Distributor		Region	Qty
DIGIKEY		Worldwide	0
NATIONAL		Worldwide	57

$61.00 each

The 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.

The evaluation board is a complete circuit allowing full operation of the LP3905 within the recommended application circuit. Each board is pre-assembled and tested in the factory. The board contains the LP3905-30 in a 14 lead LLP package with all the associated passive components to enable all features of the device to be tested.

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)

Applications:

Baseband Processors
Peripheral Processor (Video, Audio)
I/O Power
FPGA Power

Part Number(s)
(NSID)

Description

Availability

Current Reported Stock

Budgetary Pricing

Standard Pack Size

LP3905SD-A3EV

LP3905SD-A3EV Evaluation Board

Full production

Distributor		Region	Qty
DIGIKEY		Worldwide	0
NATIONAL		Worldwide	51

$61.00 each

The evaluation board is a complete circuit allowing full operation of the LP3905 within the recommended application circuit. Each board is pre-assembled and tested in the factory. The board contains the LP3905-A3 in a 14 lead LLP package with all the associated passive components to enable all features of the device to be tested.

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)

Applications:

Baseband Processors
Peripheral Processor (Video, Audio)
I/O Power
FPGA Power

Part Number(s) (NSID)	Type	Pins	MSL Rating	Peak Reflow	RoHS	CAD Symbols	Models	Package Marking Format
LP3905SD-00/NOPB	LLP	14	1	260	RoHS	Download	N/A	NS UZXYTT 3905-00
LP3905SD-30/NOPB	LLP	14	1	260	RoHS	Download	N/A	NS UZXYTT 3905-30
LP3905SD-A3/NOPB LP3905SD-A3	LLP	14	1 1	260 260	RoHS	Download	N/A	NS UZXYTT 3905-A3
LP3905SDX-00/NOPB	LLP	14	1	260	RoHS	Download	N/A	NS UZXYTT 3905-00
LP3905SDX-30/NOPB	LLP	14	1	260	RoHS	Download	N/A	NS UZXYTT 3905-30
LP3905SDX-A3/NOPB	LLP	14	1	260	RoHS	Download	N/A	NS UZXYTT 3905-A3

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)

LP3905SD-00 CMOS7 0 18406 0 0 1089000 4 309006723

LP3905SD-30 CMOS7 0 18406 0 0 1089000 4 309006723

LP3905SD-A3 CMOS7 0 18406 0 0 1089000 4 309006723

LP3905SDX-00 CMOS7 0 18406 0 0 1089000 4 309006723

LP3905SDX-30 CMOS7 0 18406 0 0 1089000 4 309006723

LP3905SDX-A3 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.

[Information as of 21-Nov-2009]