RT9172
Part Number
RT9172N-
RT9172F-
CT5
CT5
Pin Configurations
Preliminary
Part Number
RT9172S-
CT5
Pin Configurations
TOP VIEW
1.
2.
3.
4.
5.
VIN
EN
GND (TAB)
SENSE
VOUT
TOP VIEW
1.
2.
3.
4.
5.
EN
VIN
GND (TAB)
VOUT
SENSE/FLG
(Plastic TO-220-5)
(Plastic TO-220-5)
12 3 4 5
12 3 4 5
RT9172N-
RT9172F-
CM5
CM5
TOP VIEW
1.
2.
3.
4.
5.
EN
VIN
GND (TAB)
VOUT
SENSE/FLG
RT9172S-
CM5
TOP VIEW
1.
2.
3.
4.
5.
VIN
EN
GND (TAB)
SENSE
VOUT
(Plastic TO-263-5)
(Plastic TO-263-5)
1 2 3 4 5
1 2 3 4 5
Typical Application Circuit
V
IN
= 3.3V
C
IN
1µF
RT9172-25
VIN
VOUT
GND
C
OUT
V
OUT
2.5V, 3A
Fig. 1
V
IN
= 3.3V
C
IN
10
µ
F
RT9172N-25
VIN
VOUT
EN
GND SENSE
Trace resistance = R
t
V
LOAD
= 2.5V
I
LOAD
C
OUT
L
O
A
D
Fig. 2
RT9172F-25
V
IN
= 3.3V
10K
C
IN
10µF
EN
GND
FLG
VIN
VOUT
Trace resistance = R
t
V
OUT
= 2.5V
V
LOAD
= 2.5V-I
LOAD
R
t
I
LOAD
C
OUT
L
O
A
D
10K
Fig. 3
Recommend C
OUT
: (1) 10µF (or larger) electrolytic or tantalum capacitance
(2) 1µF or 10µF ceromic capacitor parrell with 100µF electrolytic or tantalum capacitance
www.richtek-ic.com.tw
DS9172-03 April 2002
2
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
