Datasheet

V
OUT
+ V
REF
ǒ
1 )
R
11
R
12
Ǔ
with an internal reference voltage V
REF
typical 0.6V
V
OUT
+ V
REF
ǒ
1 )
R
21
R
22
Ǔ
with an internal reference voltage V
REF
typical 0.6V
TPS62400, TPS62401
TPS62402, TPS62403, TPS62404
www.ti.com SLVS681E –JUNE 2006–REVISED APRIL 2010
APPLICATION INFORMATION
OUTPUT VOLTAGE SETTING
Converter1 Adjustable Default Output Voltage Setting: TPS62400
The output voltage can be calculated to:
(4)
To keep the operating current to a minimum, it is recommended to select R12 within a range of 180kΩ to 360kΩ.
The sum of R
12
and R
11
should not exceed ~1MΩ. For higher output voltages than 3.3V, it is recommended to
choose lower values than 180kΩ for R12. Route the DEF_1 line away from noise sources, such as the inductor
or the SW1 line. The FB1 line needs to be directly connected to the output capacitor. A feed-forward capacitor is
not necessary.
Converter1 Fixed Default Output Voltage Setting (TPS62401, TPS62402, TPS62403, TPS62404).
The output voltage V
OUT1
is selected with DEF_1 pin.
Pin DEF_1 = low:
TPS62401, TPS62403 = 1.575V
TPS62402, TPS62404 = 1.2V
Pin DEF_1 = high:
TS62401, TPS62403 = 1.1V
T62402: = 1.8V
T62404: = 1.9V
Converter 2 Adjustable Default Output Voltage Setting TPS62400:
The output voltage of converter 2 can be set by an external resistor network. For converter 2 the same
recommendations apply as for converter1. In addition to that, a 33pF feed-forward Capacitor C
ff2
for good load
transient response should be used. The output voltage can be calculated to:
(5)
Converter 2 Fixed Default Output Voltage Setting
ADJ2 pin must be directly connected with V
OUT2
TPS62401, V
OUT2
default = 1.8V
TPS62403, V
OUT2
default = 2.8V
TPS62402, TPS62404, V
OUT2
default = 3.3V
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Product Folder Link(s): TPS62400 TPS62401 TPS62402 TPS62403 TPS62404