Datasheet

2.5V to 6V
C1
10 Fm
C3
C4
10nF
10nF
Vout
1.2V/3A
Vin
PVIN
PVIN
EN FB
L1
470nH
C2
22 Fm
R1
75k
SW
TPS62090
SW
Power Good
AVIN
R2
150k
SS
R3
500k
AGND
PG
VOS
FREQ
CP
CN
1
2
3
4
5
6
PGND PGND
7
8
9
10
11
12
13
14 15
16
TPS62090 , TPS62091 , TPS62092 , TPS62093
SLVSAW2B –MARCH 2012–REVISED APRIL 2014 www.ti.com
10 Application and Implementation
10.1 Application Information
The TPS6209x 3 A family of devices, are high frequency synchronous step down converters optimized for small
solution size, high efficiency and suitable for battery powered applications.
10.2 Typical Applications
Figure 9. 1.2 V Adjustable Version Operating at 2.8 MHz
10.2.1 Design Requirements
The design can be optimized for highest efficiency or smallest solution size and lowest output voltage ripple. For
highest efficiency set the device switching frequency to 1.4 MHz (FREQ=high) and select the output filter
components according to Table 4. For smallest solution size and lowest output voltage ripple set the device
switching frequency to 2.8 MHz (FREQ=low) and select the output filter components according to Table 3. For
the fixed output voltage option the feedback pin needs to be connected to GND.
10.2.2 Detailed Design Procedure
The first step is the selection of the output filter components. To simplify this process, Table 1 and Table 2
outline possible inductor and capacitor value combinations.
Table 1. Output Filter Selection (2.8 MHz Operation, FREQ = GND)
OUTPUT CAPACITOR VALUE [µF]
(2)
INDUCTOR VALUE [µH]
(1)
10 22 47 100 150
0.47 √
(3)
√ √ √
1.0 √ √ √ √ √
2.2
3.3
(1) Inductor tolerance and current de-rating is anticipated. The effective inductance can vary by +20% and
-30%.
(2) Capacitance tolerance and bias voltage de-rating is anticipated. The effective capacitance can vary by
+20% and -50%.
(3) Typical application configuration. Other check mark indicates alternative filter combinations
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