RT8271 데이터 시트보기 (PDF) - Richtek Technology
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RT8271 Datasheet PDF : 15 Pages
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RT8271
Typical Application Circuit
VIN
4.75V to 24V
Chip Enable
CIN
10µF/25V
VIN
BOOT
RT8271
SW
EN
CSS
10nF
SS
GND
FB
COMP
CBOOT L1
10nF 4.7µH
D1
B230A
CC
1.5nF
RC
15k
R1
16.9k
R2
10k
VOUT
2.5V
COUT
22µF/6.3V
CP
NC
Table 1. Recommended Component Selection
VOUT (V)
R1 (kΩ) R2 (kΩ) RC (kΩ)
15
154
10
68
10
100
10
49.9
8
76.8
10
49.9
5
44.2
10
33
3.3
25.5
10
22
2.5
16.9
10
15
1.8
9.53
10
12
1.2
3
10
12
CC (nF)
0.56
0.82
1
1.2
1.5
1.5
1.5
1.5
L (μH)
22
15
10
6.8
4.7
4.7
2.2
2.2
COUT (μF)
22
22
22
22
22
22
22
22
Function Block Diagram
VIN
VCC
1µA
Internal
Regulator
Oscillator
1.2MHz/440kHz
Current Sense
Slope Comp Amplifier
+
-
10k
EN
VA VCC
-
Foldback
Control
1V +
0.5V +
3V
Shutdown
Comparator
-
UV
VCC
Comparator
+
Logic
-
Current
10µA
Comparator
0.92V +
SS
+EA
-
Gm = 920µA/V
FB
COMP
VA
BOOT
SW
GND
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DS8271-02 March 2011
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