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| LP3907 Datasheet, PDF (40/58 Pages) National Semiconductor (TI) – Dual High-Current Step-Down DC/DC and Dual Linear Regulator with I2C Compatible Interface | |||
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LP3907
SNVS511S â JUNE 2007 â REVISED APRIL 2016
9 Application and Implementation
www.ti.com
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TIâs 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
0.47 PF
1 PF
1 PF
0.47 PF
EN_T
ENLDO1
ENLDO2
ENSW1
ENSW2
LDO1
VINLDO1
VINLDO2
LDO2
SDA
SCL
GND_L
GND_C
LP3907
VINLDO12
VDD
100k
nPOR
1 PF
VIN1
10 PF
SW1
2.2 PH
FB1
10 PF
GND_SW1
VIN2
10 PF
SW2
FB2
2.2 PH
10 PF
GND_SW2
DAP
AVDD
1 PF
Copyright © 2016, Texas Instruments Incorporated
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.
40
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Copyright © 2007â2016, Texas Instruments Incorporated
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