Datasheet

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TPS40303, TPS40304, TPS40305
www.ti.com SLUS964A –NOVEMBER 2009–REVISED AUGUST 2012
Design Example 2: A High Current, Low Voltage Design Using the TPS40304
For this 20-A, 12-V to 1.2-V design, the 600kHz, TPS40304 was selected for the balance between small size and
high efficiency.
System Design Specifications
The system design specifications are shown in Table 4.
Table 4. Design Example Electrical Characteristics
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
IN
Input voltage 8.0 14 V
V
INripple
Input ripple I
OUT
= 20 A 0.5 V
V
OUT
Output voltage 0 A ≤I
OUT
≤ 20 A 1.164 1.200 1.236 V
Line regulation 8 V ≤ V
IN
≤14 V 0.5%
Load regulation 0 A ≤I
OUT
≤ 20 A 0.5%
V
RIPPLE
Output ripple I
OUT
= 20 A 36 mV
V
OVER
Output overshoot 5 A ≤I
OUT
≤ 15 A 100 mV
V
UNDER
Output undershoot 5 A ≤I
OUT
≤ 15 A 100 mV
I
OUT
Output current 8 V ≤ V
IN
≤14 V 0 20 A
t
SS
Soft-start time V
IN
= 12 V 1.5 ms
I
SCP
Short-circuit current trip point 26 A
Efficiency V
IN
= 12 V, I
OUT
= 12 A %
f
SW
Switching frequency 600 kHz
Size 1.5 in
2
Schematic
Figure 22. TPS40304 Design Example Schematic
Typical Performance Characteristics
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Product Folder Links :TPS40303 TPS40304 TPS40305