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Features

(1)

Use three such LDOs to power up DVDDA, DVDDB, DVDDC (It can either be 1.8 V or 3.3 V)

(2)

Rx = 0.499 M

Ω, Ry = 1 MΩ for Vout = 1.8 V

(3)

Rx = 1.8 M

Ω, Ry = 1 MΩ for Vout = 3.3 V

(4)

For proper sequencing of output, enable of the LDOs are fed either from 1.2-V output from TPS74701 if

DVDDX is 1.8 V or from 1.8-V output from TPS71718 if DVDDX is 3.3 V.

Figure 2. Optional Circuit for DVDD_A, DVDD_B, and DVDD_C

5

SLVA342A – June 2009 – Revised May 2010

Simple Power Solution Using LDOs

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