RT8048
Typical Application Circuit
RT8048
V
IN
C
IN
3
VIN
LX
4
L
V
OUT
C1
FB
GND
6
R2
R1
C
OUT
2 EN
5, 7(Exposed Pad)
Figure 1. Adjustable Voltage Regulator
RT8048
V
IN
C
IN
3
VIN
LX
4
L
V
OUT
C
OUT
2 EN
VOUT
GND
6
5, 7(Exposed Pad)
Figure 2. Fixed Voltage Regulator
Table 1. Recommended Component Selection
V
OUT
(V)
1.2
1.8
2.5
3.3
L (μH)
0.47
0.47
1
1
R1 (kΩ)
82
100
91
82
R2 (kΩ)
82
49.9
28.7
18
C
OUT
(μF)
4.7
4.7
4.7
10
Function Pin Description
Pin No.
Adjustable
Output Voltage
1
2
3
4
Fixed Output
Voltage
1
2
3
4
Pin Name
NC
EN
VIN
LX
No Internal Connection.
Chip Enable (Active High).
Power Input.
Switch Node.
Ground. The exposed pad must be soldered to a large PCB and
connected to GND for maximum power dissipation.
Feedback.
Output Voltage.
Pin Function
5,
5,
GND
7 (Exposed Pad) 7 (Exposed Pad)
6
--
--
6
FB
VOUT
www.richtek.com
2
DS8048-01 June 2011
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
