Datasheet

www.ti.com
APPLICATION CURVES
1.408
1.406
1.410
1.404
1.402
1.400
5.5 6.0 7.04.0 5.04.5 6.5
V
OUT
− Output Voltage − V
V
IN
− Input Voltage − V
I
OUT
= 1.5 A
I
OUT
= 1.0 A
I
OUT
= 0.5 A
No Load
0 0.2 0.4 0.6 0.8 1.0
60
70
100
1.2 1.4 1.6
80
90
65
95
75
85
I
LOAD
− Load Current − A
η − Efficiency − %
V
IN
= 5 V
V
OUT
= 1.25 V
V
OUT
= 3.3 V
TPS40222
SLUS642A – OCTOBER 2005 – REVISED JANUARY 2006
Table 3. List of Materials
REFERENCE VENDOR PART
QTY DESCRIPTION VENDOR NOTES
DESIGNATOR NUMBER
C1A, C1B 2 Capacitor, 22 µF ceramic, 1206 Input bypass
High-frequency bypass, mount
C1D 1 Capacitor, 0.1 µF ceramic, 0805
near V
CC
C2 1 Capacitor, 33 nF ceramic, 0805 Bootstrap
C3A, C3B 2 Capacitor, 22 µF ceramic, 1206 Output capacitors
Snubber (optional - open if not
C4 1 Capacitor, 680 pF ceramic, 0805
used)
Device input voltage filter
C5 1 Capacitor, 1 µF ceramic, 0805
capacitor
D1 1 Diode, Schottky, 1 A RSX501L-20 ROHM Catch diode
L1 1 Inductor, 3.3 µH ELL6PV3R3N Panasonic Filter inductor
R1 1 Resistor, 5620 Ω , 1%, SMD, 0603 Voltage setting resistor
R2 1 Resistor, 10 k Ω , 1%, SMD, 0603 Voltage setting resistor
Snubber (optional - open if not
R3 1 Resistor, 10 Ω , 10%, SMD, 0805
used)
Device input voltage filter (optional
R4 1 Resistor, 10 Ω , 10%, SMD, 0603
- short if not used)
Output pre-load (optional - open if
R5 1 Resistor, 120 Ω , 10%, SMD, 0805
not used)
Texas
U1 1 PWM converter device TPS40222
Instruments
OUTPUT VOLTAGE EFFICIENCY
vs vs
INPUT VOLTAGE AT LOAD CURRENT LOAD CURRENT
Figure 16. Figure 17.
18