Pin Descriptions

Pin #

Name

Description

1

EN2

Enable Pin for Buck2

2

TGND

Ground Pin

3

LDO2

LDO2 Output Pin

4

VIN2

Input Power Terminal to LDO1 & 2

5

LDO1

LDO1 Output Pin

6

GND

LDO1 & 2 Ground Pin

7

EN1

Enable Pin for Buck1 and LDO1&2

8

FB1

Buck1 Feedback Pin

9

GND_B1

Buck1 Ground Pin

10

SW1

Buck1 Switch Pin

11

VIN1

Input Power Terminal to Buck1 & 2

12

SW2

Buck2 Switch Pin

13

GND_B2

Buck2 Ground Pin

14

FB2

Buck2 Feedback Pin

DAP

SGND

Die Attach Pad (DAP)

Ordering Information

Buck 1 [V] Buck 2 [V] LDO 1 [V]

LDO 2 [V]

Order Number

Package Marking

Supplied As

1.2

1.875

2.8

2.8

LP3905SD-00

3905-00

1000 units, Tape-and-Reel

LP3905SDX-00

4500 units, Tape-and-Reel

1.2 Fixed

PWM

1.875

Fixed

PWM

2.8

2.8

LP3905SD-30

3905-30

1000 units, Tape-and-Reel

LP3905SDX-30

4500 units, Tape-and-Reel

ADJ

ADJ

3.0

2.8

LP3905SD-A3

3905-A3

1000 units, Tape-and-Reel

LP3905SDX-A3

4500 units, Tape-and-Reel

Package Marking Diagram

20152905

•

The physical placement of the package marking will vary from part to part.

•

Date Code - UZXYTT format. ’U’ - Wafer fab code; ’Z’ - assembly site code; ’XY’ 2 digit date code; ’TT’ die run code

•

See National Web site for more info - http://www.national.com/quality/marking_conventions.html

FIGURE 4. LP3905 14 Pin LLP Package Marking

NS package number SDA14B

www.national.com

3