TPS54292 datasheet(27/35 Pages) TI1

Part #	TPS54292

Description	1.5-A/2.5-A Dual, Fully-Synchronous Buck Converter With Integrated MOSFET

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Manufacturer	TI1 [Texas Instruments]

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27 / 35 page

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3.3V@1.5A

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1.2V@1.5A

TPS54290, TPS54291, TPS54292

www.ti.com

SLUS973 – OCTOBER 2009

Design Example 2 (Cascading Operation)

TPS5429x can be configured as cascaded operation as shown in Figure 25. The 12-V input supply is applied to

PVDD2 and the the channel 2 output is tied to PVDD1. The channel 2 output is 3.3 V and capable of supporting

1.5 A to the load while generating power for the 1.2-V input for channel 1.

Figure 25. Cascading Operation

Design Example 2 Test Results

For Figure 26, Ch1: 12-V supply; Ch2: VOUT1 (1.2 V); Ch3: VOUT2(3.3 V). For Figure 27, Ch1: Channel 1 SW

node; Ch2: Channel 1 output ripple Ch3: Channel 2 output ripple; Ch2: Channel 2 SW node.

Figure 26. Start-Up Waveforms

Figure 27. Output Ripple and SW Nodes

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Product Folder Link(s) :TPS54290 TPS54291 TPS54292

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