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| LP3907 Datasheet, PDF (22/58 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
Feature Description (continued)
I2C
Regulator ON
Ext_Enable
Pins
0
1
Start Programmed
Timing Sequence
EN_T
Figure 32. Power Rail Enable Logic
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EN_T
Vout Buck1
Vout Buck2
t1
t2
Vout LDO1
Vout LDO2
t3
t4
Figure 33. LP3907 Default Power-Up Sequence
Table 5. Power-On Timing Specification
DESCRIPTION
t1
Programmable delay from EN_T assertion to VCC_Buck1 On
t2
Programmable delay from EN_T assertion to VCC_Buck2 On
t3
Programmable delay from EN_T assertion to VCC_LDO1 On
t4
Programmable delay from EN_T assertion to VCC_LDO2 On
MIN
NOM
1.5
2
3
6
TYP UNIT
ms
ms
ms
ms
EN_T
Vout Buck1
Vout Buck2
Vout LDO1
Vout LDO2
t1
t2
t3
t4
Figure 34. LP3907 Default Power-Off Sequence
22
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Copyright © 2007â2016, Texas Instruments Incorporated
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