LP3907SQ-JXQXEV National Semiconductor, LP3907SQ-JXQXEV Datasheet - Page 12

• Manufacturer Part Number: LP3907SQ-JXQXEV
• Description: LP3907 EVALUATION BOARD
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LP3907SQ-JXQXEV

• Main Purpose: DC/DC, Step Down with LDO
• Outputs And Type: 4, Non-Isolated
• Current - Output: 1A, 600mA, 300mA, 300mA
• Regulator Topology: Buck
• Frequency - Switching: 2.1MHz
• Board Type: Fully Populated
• Utilized Ic / Part: LP3907
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Voltage - Output: -
• Voltage - Input: -
• Power - Output: -

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JUMPER
JP 1-6
JP 7-8
JP 9–12
JP50
USBPOWER
SDA, SCL
*ADC
PURPOSE
These jumpers connect different Vins to the
system VDD (VDD_M):
JP1 connects VIN1 to VDD_M
JP2 connects VIN2 to VDD_M
JP3 connects the Buck core VDD to VDD_M
JP4 connects VINLDO1 to VDD_M
JP5 connects VINLDO12 to VDD_M
JP6 connects VINLDO2 to VDD_M
These jumpers connect the output of LDO1
and LDO2 to GND:
JP7 connects LDO2 to GND
JP8 connects LDO1 to GND
These jumpers tie the enables of each
regulator to VDD:
JP9 — LDO1
JP10 — LDO2
JP11 — Buck1
JP12 — Buck2
This jumper connects the GND of the USB
interface with GND_M.
This jumper allows the USB to power the
board.
These jumpers allow the GUI to interface with
the chip.
These jumpers connect outputs of various
regulators to the ADCs of the USB.
Table 2. Jumper Settings
12
NOTE
JP1 and JP2 allow the bucks to be powered from the system
power.
JP4 and JP6 allow the LDOs to be powered from the system
power.
JP3 and JP5 powers the internal bias and error amplifiers from
the system power. The voltage applied to AVDD and VINLDO12
should be in the range of 2.7 – 5.5V.
These jumpers are used to connect the output of the respective
LDOs to GND for short circuit testing purposes.
When connected, these jumpers ehable the regulators. If
disconnected, the regulator will power off.
This jumper must be connected for USB interface functionality.
This jumper must be removed if powering from an external
power supply.
This jumper should be disconnected if powering from an external
power supply.
It should be set to 5.0V if powering from the USB.
Connect these jumpers for the GUI to work.
Needs to be jumpered to measure the voltages of different
regulators from the GUI.