LP3905SD-30EV National Semiconductor, LP3905SD-30EV Datasheet

LP3905SD-30EV

Manufacturer Part Number

LP3905SD-30EV

Description

BOARD EVALUATION LP3905SD-30

Manufacturer

National Semiconductor

Datasheets

1.LP3905SDX-00NOPB.pdf (15 pages)

2.LP3905SD-30EV.pdf (4 pages)

Specifications of LP3905SD-30EV

Main Purpose

DC/DC, Step Down with LDO

Outputs And Type

4, Non-Isolated

Voltage - Output

1.2V, 1.875, 2.8V, 2.8V

Current - Output

600mA, 600mA, 100mA, 100mA

Voltage - Input

3 ~ 5.5V

Regulator Topology

Buck

Frequency - Switching

2MHz

Board Type

Fully Populated

Utilized Ic / Part

LP3905

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Power - Output

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LP3905-30 Application

Board Information

General Information

The evaluation board is a complete circuit allowing full oper-

ation 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 fea-

tures of the device to be tested.

Operational Information

The circuit used in the evaulation board is that shown on the

device datasheet.

Schematic Diagram

The LP3905-30 has fixed output voltages as follows:

O/P

Buck1

Buck2

LDO1

LDO2

LP3905-30 Output Voltages

Voltage (V)

1.2

1.875

2.8

201981

Evaluation Board Schematic

National Semiconductor

Application Note 1501

Graham Roxburgh

March 2007

LP3905 is optimized for low power handheld applications.

This device provides two 600 mA DC/DC Buck regulators,

and two 100 mA linear regulators as configured on the board.

The LP3905 additionally features two enable pins allowing

control over the device outputs.

The board is fitted with 0.47µF capacitors on the outputs of

the LDO’s and thus the load current for these LDO’s should

not exceed 100mA.

The device has 1MΩ internal resistors from EN1 and EN2 to

GND.

www.national.com

20198101

Related parts for LP3905SD-30EV

LP3905SD-30EV Summary of contents

Page 1

... Buck2 1.875 LDO1 2.8 LDO2 2.8 © 2007 National Semiconductor Corporation National Semiconductor Application Note 1501 Graham Roxburgh March 2007 LP3905 is optimized for low power handheld applications. This device provides two 600 mA DC/DC Buck regulators, and two 100 mA linear regulators as configured on the board. ...

Page 2

Connection Information Connect a supply voltage (3.0V to 5.5V) to either of the VIN pins on the evaluation board. LK4 hardwired on the board connects both the BUCK supply side to the LDO supply side. These supplies are both required ...

Page 3

Bill of Materials for LP3905-30 LLP Evaluation Board Item Type Value U1 L1,L2 Inductor 1.0µF C1, C3 Capacitor 0.47µF C4, C5, C6 Capacitor 10µF C2 Capacitor 1.0nF Qty Part Number Suggested 1 LP3905-30 1 DO3314-222MLB 2 GRM188R61A474KA61D 3 GRM21BR61A106KE19L 1 ...

Page 4

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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