LP3907SQ-PFX6WSLASHNOPB datasheet(40/58 Pages) TI1

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LP3907

VINLDO1

SDA

GND_L

LDO1

ENLDO1

SCL

VIN1

LDO2

SW2

FB2

VIN2

GND_SW2

ENSW1

ENSW2

VINLDO2

EN_T

ENLDO2

GND_C

AVDD

VINLDO12

DAP

0.47 PF

1 PF

0.47 PF

2.2 PH

10 PF

1 PF

10 PF

GND_SW1

SW1

FB1

10 PF

2.2 PH

nPOR

VDD

100k

LP3907

SNVS511S – JUNE 2007 – REVISED APRIL 2016

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Product Folder Links: LP3907

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9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

The LP3907 provides three control methods to turn ON/OFF four power rails:

1. EN_T Control: Provides pre-defined power up/down sequence. (Note: VIN/Battery voltage must be settled

approximately 8 ms, minimum, before EN_T be asserted high).

2. Individual GPIO/EN pin control: four EN pins provide max control flexibility without I2C.

3. I2C control: besides simple ON/OFF control, also provides access to all the user programmable registers.

See Register Maps for details.

9.2 Typical Application

Figure 45. LP3907 Typical Application

9.2.1 Design Requirements

Ten ceramic capacitors and two inductors are required for this application. These three external components

must be selected very carefully for property operation. See Detailed Design Procedure.

LP3907SQ-PFX6W/NOPB 데이터시트(PDF) 40 Page - Texas Instruments

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