Datasheet

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Description

1 Description

The TPS51218EVM is designed to use a regulated 12-V bus to produce a regulated 1.2-V output at up to

20 A of load current. The TPS51218EVM is designed to demonstrate the TPS51218 in a typical,

low-voltage application while providing a number of test points to evaluate the performance of the

TPS51218.

1.1 Typical Applications

• High-current system converters for server and desktop power

• Switchers and routers

• Embedded computers

• In-vehicle infotainment PCs

• POS terminals

• Point-of-load modules

• Graphics cards

• Industrial control/factory automation PCs

1.2 Features

The TPS51218EVM features:

• 20-Adc steady-state current

• Support prebias output voltage start-up

• 380-kHz switching frequency

• J4 for enable function

• J3 for auto-skip and forced CCM selection

• Convenient test points for probing critical waveforms

2 Electrical Performance Specifications

Table 1. TPS51218EVM Electrical Performance Specifications

Parameter Test Conditions Min Typ Max Units

INPUT CHARACTERISTICS

Voltage range VIN 8 12 14 V

Maximum input current VIN = 8 V, Io = 20 A 3.55 A

No load input current Vin = 14 V, Io = 0 A 50 mA

OUTPUT CHARACTERISTICS

Output voltage VOUT 1.2 V

Line regulation (Vin = 10 V–14 V) 1.0%

Output voltage regulation

Load regulation (Vin = 12 V, Io = 0 A–20 A) 1.0%

Output voltage ripple Vin = 12 V, Io = 20 A 40 mVpp

Output load current 0 20 A

Output overcurrent 30 A

SYSTEMS CHARACTERISTICS

Switching frequency 380 kHz

Peak efficiency Vin = 12 V, 1.2 V/10 A 90.32%

Full-load efficiency Vin = 12 V, 1.2 V/20 A 88.64%

Operating temperature 25 °C

SLVU346–January 2010 Using the TPS51218EVM-496 High-Performance, Single Synchronous,

Step–Down Controller for High-Current, Eco-mode™ Applications

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