LP3906SQ-JXXIEV National Semiconductor, LP3906SQ-JXXIEV Datasheet - Page 2

• Manufacturer Part Number: LP3906SQ-JXXIEV
• Description: BOARD EVALUATION LP3906SQ-JXXI
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LP3906SQ-JXXIEV

• Main Purpose: DC/DC, Step Down with LDO
• Outputs And Type: 4, Non-Isolated
• Current - Output: 1.5A, 1.5A, 300mA, 300mA
• Regulator Topology: Buck
• Frequency - Switching: 2MHz
• Board Type: Fully Populated
• Utilized Ic / Part: LP3906
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Output: -
• Voltage - Input: -
• Power - Output: -
• Lead Free Status / Rohs Status: Supplier Unconfirmed

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Evaluation Kit Setup
Please use ESD protection to prevent any unwanted damag-
ing ESD events!
The LP3906 Evaluation Board should contain a USB interface
to the left, as shown in Figure 1.
Connect this setup to the USB port of a PC using the included
USB cable. When the USB board is plugged in for the first
time, the operating system prompts for “New hardware found”
and installs the USB driver. If this does not happen, try un-
plugging and plugging in the cable again.
LP3906 evaluation software can run directly from the deliv-
ered CD by double clicking its icon. However, we recommend
that it be copied to the PC’s hard disk and run from there.
The software runs on WinXP and Windows 2000. Please
note: Win XP OS administrator rights may be required to run
the software.
FIGURE 2. USB Interface Settings
2
Cautionary Notes
Always disconnect the USB cable from the board when
changing the supply jumper setting (USBPower jumper de-
scribed on page 9). Failure to do so may stop the USB board
from responding.
If the USB interface is not responding or the software hangs
up, press the reset button shown below, or disconnect the
USB cable for 5 seconds. Details of the operation of the USB
interface board can be found in the accompanying USB in-
terface manual.
The evaluation software allows control of all registers neces-
sary to control the device through sliders and buttons. Direct
Register Programming (described on pg. 5) should only be
used for debugging purposes.
The GUI can be used in conjunction with an external supply,
as long as the USB cable is plugged into the board, and the
USBPOWER jumper is removed.
If the user is using an external supply and the cable is
NOT plugged into the board, be sure to remove the
jumpers connecting the USB interface to the chip – US-
BPOWER, GND plane, SDA, SCL, and all of the ADC
jumpers.
20210802