Datasheet
PGND
FB
PG
VIN
8
LBO
GND
SYNC
EN
LBI
TPS62050
SW
1
6
7
3
2
9
5
4
10
L1 = 10 µH
V
O
= 0.7 V / 600 mA
R1 = 270 kΩ
C
(ff)
= 22 pF
R2 = 680 kΩ
C
o
= 47 µF
C
i
= 10 µF
V
I
= 2.7 V to 7 V
L1 = 10 µH
V
O
= 1.8 V / 600 mA
C
o
= 22 µF
C
i
= 10 µF
V
I
= 2.7 V to 10 V
FB
PG
VIN
8
LBO
GND
SYNC
EN
LBI
PGND
TPS62054
SW
1
6
7
3
2
9
5
4
10
R3
R5
R6
R4
TPS62052, TPS62054
TPS62056, TPS62050, TPS62051
www.ti.com
SLVS432E –SEPTEMBER 2002–REVISED JUNE 2011
Table 2. Values
NOMINAL OUTPUT VOLTAGE EQUATION POSSIBLE RESISTOR COMBINATION TYPICAL FEEDBACK CAPACITOR
0.7 V R1 = 0.4 x R2 R1 = 270 k, R2 = 680 k C
(ff)
= 22 pF
1.2 V R1 = 1.4 x R2 R1 = 510 k, R2 = 360 k (1.21 V) C
(ff)
= 6.8 pF
1.5 V R1 = 2 x R2 R1 = 300 k, R2 = 150 k (1.50 V) C
(ff)
= 6.8 pF
1.8 V R1 = 2.6 x R2 R1 = 390 k, R2 = 150 k (1.80 V) C
(ff)
= 6.8 pF
2.5 V R1 = 4 x R2 R1 = 680 k, R2 = 169 k (2.51 V) C
(ff)
= 6.8 pF
3.3 V R1 = 5.6 x R2 R1 = 560 k, R2 = 100 k (3.30 V) C
(ff)
= 6.8 pF
5 V R1 = 9 x R2 R1 = 820 k, R2 = 91 k (5.0 V) C
(ff)
= 6.8 pF
STANDARD CIRCUIT FOR FIXED VOLTAGE VERSION
CONVERTER FOR 0.7-V OUTPUT VOLTAGE
The TPS62050 is used to generate output voltages as low as 0.7 V. With such low output voltages, the inductor
discharges very slowly. This leads to a high output voltage ripple in power-save mode (SYNC = GND). It is
therefore recommended to use a larger output capacitor to keep the output ripple low. With an output capacitor of
47 µF, the output voltage ripple is less than 40 mV
PP
.
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