Datasheet
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Description
1 Description
The TPS51217EVM is designed to use a regulated voltage between 8 V and 20 V to produce dynamically
selectable 0.9 V to 1.2 V output at up to 20 A of load current. The TPS51217EVM is designed to
demonstrate the TPS51217 in a typical low-voltage application while providing a number of test points to
evaluate the performance of the TPS51217.
1.1 Typical Applications
• Notebook Computers
• I/O Supplies
• System Power Supplies
1.2 Features
• Dynamically selectable output voltage from 0.9 V to 1.2 V by 0.1-V step
• 20-A DC steady state current
• Supports pre-bias output voltage start-up
• 340-kHz switching frequency
• SW1 for enable function
• Convenient test points for probing critical waveforms
2 Electrical Performance Specifications
Table 1. TPS51217EVM Electrical Performance Specifications
SPECIFICATION TEST CONDITIONS MIN TYP MAX UNITS
INPUT
V
IN
Input voltage range 8 12 20 V
I
MAX
Maximum input current V
IN
=8 V, I
OUT
= 20 A 3 A
No load input current V
IN
=8 V, I
OUT
= 0 A 0.01 mA
V
V5IN
Voltage range 4.5 5.0 5.5 V
I
MAX
Maximum input current V
V5IN
=5 V, V
IN
=12 V, I
OUT
= 20 A 15 mA
No load input current V
V5IN
=5 V, V
IN
=12 V, I
OUT
= 0 A 0.4 mA
OUTPUT
V
IN
=12 V, (VID1,VID0)=(0,0), I
OUT
= 10 A 0.9
V
IN
=12 V, (VID1,VID0)=(0,1), I
OUT
= 10 A 1.0
V
OUT
Output voltage V
V
IN
=12 V, (VID1,VID0)=(1,0), I
OUT
= 10 A 1.1
V
IN
=12 V, (VID1,VID0)=(0,0), I
OUT
= 10 A 1.2
I
OUT
Output current Output load current 20 A
Line Regulation 8 V ≤ V
IN
≤ 20 V, V
OUT
=0.9 V, I
OUT
= 20 A 0.3%
Load Regulation V
IN
= 12 V, V
OUT
=0.9 V, 1 mA ≤ I
OUT
≤ 20 A 0.4%
V
RIPPLEL
V
IN
= 12 V, V
OUT
=0.9 V, I
OUT
= 20 A 29 mV
P-P
I
OC
Output overcurrent 28
SYSTEM
f
SW
Switching frequency V
IN
= 8 V, V
OUT
=0.9 V, I
OUT
= 10 A 340 kHz
Peak efficiency V
IN
= 12 V, V
OUT
=0.9 88.8%
Full load efficiency V
IN
= 12 V, V
OUT
=0.9 V, I
OUT
= 20 A 84.4%
T
A
Operating ambient temperature 25 °C
3
SLUU420–MAY 2010 Using the TPS51217EVM-533, High-Performance, Single-Synchronous
Step-Down Controller for Notebook Power Supply
Copyright © 2010, Texas Instruments Incorporated