Datasheet

TPS40322
SLUSAF8D –JUNE 2011–REVISED JANUARY 2014 www.ti.com
TPS40322 Design Example 2
Two-Phase, Single Output Configuration from 12-V nominal to 1.2-V DC-to-DC Converter Using
the TPS40322
The following example shows the schematic, waveforms, and components for a two-phase, single output
synchronous buck converter using the TPS40322 controller. The design goal parameters are given in Table 6.
Table 6. TPS40322 Design Example Specification
PARAMETER TEST CONDITION MIN NOM MAX UNIT
V
IN
Input voltage 4.5 15 V
V
OUT
Output voltage I
OUT(min)
≤ I
OUT
≤ I
OUT(max)
1.2 V
Line regulation V
IN(min)
≤ V
IN
≤ V
IN(max)
0.5%
Load regulation I
OUT(min)
≤ I
OUT
≤ I
OUT(max)
0.5%
V
RIPPLE
Output ripple I
OUT1
= I
OUT1(max)
12 mV
V
OVER
Output overshoot ΔI
OUT1
= 5 A 40 mV
V
UNDER
Output undershoot ΔI
OUT1
= 5A 40 mV
I
OUT
Output current V
IN(min)
≤ V
IN
≤ V
IN(max)
0 30 A
t
SS
Soft-start time V
IN
= 12 V 2 ms
η Efficiency V
IN
= 12 V, I
OUT1
= I
OUT2
= 10 A 88%
f
SW
Switching frequency 500 kHz
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