Datasheet

TPS56221
SLUSAH5B –MARCH 2011–REVISED SEPTEMBER 2012 www.ti.com
DESIGN EXAMPLE
Introduction
This design example describes a 25-A, 12-V to 1.0-V design using the TPS56221 high-current integrated buck
converter. The system specifications are listed in Table 1.
Table 1. Design Example Parameters
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
IN
Input voltage 8.0 14 V
V
IN(ripple)
Input ripple I
OUT
= 25 A 0.2 V
V
OUT
Output voltage 0 A ≤ I
OUT
≤ 25 A 0.98 1.00 1.02 V
Line regulation 8 V ≤ V
IN
≤ 14 V 0.1%
Load regulation 0 A ≤ I
OUT
≤ 25 A 1.0%
V
P-P
Output ripple I
OUT
= 25 A 20 mV
V
OVER
Output overshoot I
TRAN
= 10 A 100 mV
V
UNDER
Output undershoot I
TRAN
= 10 A 100 mV
I
OUT
Output current 8 V ≤ V
IN
≤ 14 V 0 25 A
t
SS
Softstart time V
IN
= 12 V 2.0 ms
I
SCP
Short circuit current trip point 32 A
η Efficiency V
IN
= 12 V, I
OUT
= 25 A 87 %
f
SW
Switching frequency 500 kHz
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