Datasheet

p´ ´ ´
ff
1
1
C =
2 R 25 kHz
f
p´ ´ ´
z
1 ff
1
= = 25 kHz
2 R C
2
1
OUT
1
OUT REF 1 2
REF
V
R
V = V R = 1 R
R V
æ ö æ ö
´ + - ´
ç ÷ ç ÷
è ø è ø
PVIN
PGND
EN
FB
PG
L
1.0 H
m
SW
C
10 F
OUT
m
V
1.8 V 2 A
OUT
V = 2.9 V to 6 V
IN
AVIN
AGND
C
22 pF
ff
R
100 k
PG
W
R
180 k
2
W
R
360 k
1
W
C
10
IN
mF
V = 1.8 V
up to 2 A
OUT
R
360 k
1
Ω
R
180 k
2
Ω
V = 2.9 V to 6 V
IN
C
10
OUT
µF
C
10
IN
µF
PVIN
AVIN
EN
MODE
AGND
PGND
SW
FB
C
22 pF
ff
L
1.0 Hm
TPS62065, TPS62067
www.ti.com SLVS833B –MARCH 2010–REVISED NOVEMBER 2013
APPLICATION INFORMATION
Figure 26. TPS62065 1.8V Adjustable Output Voltage Configuration
Figure 27. TPS62067 Adjustable 1.8-V Output
OUTPUT VOLTAGE SETTING
The output voltage can be calculated to:
with an internal reference voltage V
REF
typically 0.6V.
To minimize the current through the feedback divider network, R
2
should be within the range of 120 kΩ to 360
kΩ. The sum of R
1
and R
2
should not exceed ~1MΩ, to keep the network robust against noise. An external feed-
forward capacitor C
ff
is required for optimum regulation performance. Lower resistor values can be used. R
1
and
C
ff
places a zero in the loop. The right value for C
ff
can be calculated as:
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