DS8048-01 Datasheet, PDF (2/11 Pages) Richtek Technology Corporation – 3MHz 1A Step-Down Converter

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