RT7274 Datasheet, PDF (11/22 Pages) Richtek Technology Corporation – 2A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter

RT7274/79/80/81
Typical Application Circuit
For TSSOP-14 (Exposed Pad) Package
V_IN
C1
C2
10µF x 2 0.1µF
Output Signal
PVCC
Input Signal
R3 100k
C4
1µF
C5
3.9nF
L1
RT7279/80
13 _VIN
SW ^{10, 11}
2µH
C6
14 _VINR
BOOT
FB
12
2
0.1µF C3
6 _PGOOD
7 _EN
3 _PVCC
4 _SS
GND ⁵
VOUT ¹
PGND ^{8, 9, 15 (Exposed Pad)}
R1
8.25k
R2
22k
C7
22µF x 2
V_OUT
1.05V/2A
For SOP-8 (Exposed Pad) Package
V_IN
Enable
C1
10µF x 2
RT7274/81
8 _VIN
6
SW
C2
0.1µF
1 _EN
BOOT ⁷
5, 9 (Exposed Pad) _GND
FB ²
C5
3.9nF
4 _SS
PVCC ³
L1
2µH
C6
0.1µF
C3
R1
8.25k
V_OUT
1.05V/2A
C7
22µF x 2
C4 ^VPVCC
1µF
R2
22.1k
V_OUT (V)
1
1.05
1.2
1.8
2.5
3.3
5
7
Table 1. Suggested Component Values
R1 (kΩ)
R2 (kΩ)
C3 (pF)
L1 (μH)
6.81
22.1
--
2
8.25
22.1
--
2
12.7
22.1
--
2
30.1
22.1
5 to 22
3.3
49.9
22.1
5 to 22
3.3
73.2
22.1
5 to 22
3.3
124
22.1
5 to 22
4.7
180
22.1
5 to 22
4.7
C7 (μF)
22 to 68
22 to 68
22 to 68
22 to 68
22 to 68
22 to 68
22 to 68
22 to 68
Copyright ©2013 Richtek Technology Corporation. All rights reserved.
DS7274/79/80/81-01 February 2013
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
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