Datasheet

Description

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10 5-V Output Ripple ......................................................................................................... 11

11 3.3-V Output Ripple ....................................................................................................... 11

12 5-V Switching Node ....................................................................................................... 12

13 3.3-V Switching Node..................................................................................................... 12

14 5-V Output Transient from DCM to CCM............................................................................... 12

15 5-V Output Transient from CCM to DCM............................................................................... 12

16 3.3-V Output Transient from DCM to CCM ............................................................................ 13

17 3.3-V Output Transient from CCM to DCM ............................................................................ 13

18 5-V Output, 2.5-V Prebias Start up...................................................................................... 13

19 3.3-V Output, 2-V Prebias Start up...................................................................................... 13

20 Top Board at 12 Vin, 5 V/10 A, 3.3 V/10 A, 25°C Ambient without Airflow ....................................... 14

21 TPS51225EVM-133 Top Layer Assembly Drawing................................................................... 15

22 TPS51225EVM-133 Bottom Assembly Drawing ...................................................................... 15

23 TPS51225EVM-133 Top Copper ....................................................................................... 16

24 TPS51225EVM-133 Layer 2 Copper ................................................................................... 16

25 TPS51225EVM-133 Layer 3 Copper ................................................................................... 17

26 TPS51225EVM-133 Layer 4 Copper ................................................................................... 17

List of Tables

1 TPS51225EVM-133 Electrical Performance Specifications ........................................................... 3

2 EN1 Selection ............................................................................................................... 7

3 EN2 Selection ............................................................................................................... 7

4 The Functions of Each Test Points ....................................................................................... 8

5 EVM Components List .................................................................................................... 18

1 Description

The TPS51225EVM-133 is designed to use a regulated 12-V bus to produce regulated 5- and 3.3-V

outputs at up to 10 A each of load current. The EVM demonstrates the TPS51225 as a computing-system

power supply. It also provides 5- and 3.3-V LDOs and 14-V voltage-current protection (VCP) for charge

pump application.

1.1 Typical Applications

• Notebook Computers, Netbooks, Tablet Computers

• Servers, Telecom motherboards, Embedded Computers

1.2 Features

The TPS51225EVM-133 features:

• 10-A DC steady-state output current for 5- and 3.3-V outputs

• Supports pre-bias output voltage start-up

• S1 for Enable/Disable Output1

• S2 for Enable/Disable Output2

• Convenient test points for probing critical waveforms

Dual Synchronous Step-Down Fixed Output Controller with 5-V and 3.3-V SLVU735–June 2012

LDOs

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