Datasheet

V
O
+ V
FB
R1 ) R2
R2
R1 + R2
ǒ
V
O
V
FB
Ǔ
–R2
V
FB
+ 0.5V
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
= 5 V
R1 =
820 kΩ
C
(ff)
= 6.8 pF
R2 = 91 kΩ
C
o
= 22 µF
C
i
= 10 µF
V
I
R5
130 kΩ
R6
100 kΩ
R3
1 M
R4
1 M
TDK
C3216X5R1A106M
Taiyo Yuden
JMK316BJ226ML
WE PD 744 777 10
Quiescent Current Measurements and Efficiency Were Taken
With: R5 = Open, R4 = Open, LBI Connected to GND.
FB
PG
VIN
8
LBO
GND
SYNC
EN
LBI
PGND
TPS62051
SW
1
6
7
3
2
9
5
4
10
R3 R4 R1
R2
R5
R6
R7
1 Cell Li-lon
C
i
= 10 µF
L1 = 10 µH
V
O
= 2.5 V / 600 mA
C
o
= 22 µF
C
(ff)
=
6.8 pF
TPS62052, TPS62054
TPS62056, TPS62050, TPS62051
SLVS432E –SEPTEMBER 2002–REVISED JUNE 2011 www.ti.com
Figure 21. Enhanced LBI With Increased Hysteresis
A MATHCAD
®
file to calculate R7 can be downloaded from the product folder on the TI web.
No Load Operation
If the converter operates in the forced PWM mode and there is no load connected to the output, the converter
regulates the output voltage by allowing the inductor current to reverse for a short period of time.
STANDARD CIRCUIT FOR ADJUSTABLE VERSION
14 Submit Documentation Feedback Copyright © 2002–2011, Texas Instruments Incorporated
Product Folder Links: TPS62052 TPS62054 TPS62056 TPS62050 TPS62051