RT8268 View Datasheet(PDF) - Richtek Technology
Part Name
Description
Manufacturer
RT8268 Datasheet PDF : 15 Pages
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RT8268
Typical Application Circuit
VIN
4.75V to 24V
Chip Enable
CIN
10µF/25V
VIN
BOOT
RT8268
SW
EN
CSS
10nF
SS
GND
FB
COMP
CBOOT L1
10nF 15µH
D1
B220A
CC
3.9nF
RC
10k
R1
25.8k
R2
10k
VOUT
3.3V
COUT
22µF/6.3V
CP
NC
Table 1. Recommended Component Selection
VOUT (V) R1 (kΩ) R2 (kΩ) RC (kΩ) CC (nF)
15
153
10
48.7
0.82
L1 (μH)
33
COU T (μF)
22
10
100
10
34
1.2
33
22
8
76.8
10
24
1.5
22
22
5
44.2
10
16
2.2
22
22
3.3
25.8
10
10
3.9
15
22
2.5
17
10
7.5
1.5
10
22
1.8
9.31
10
6.04
1.5
10
22
1.2
3
10
6.04
3.9
6.8
22
Function Block Diagram
VIN
VCC
1µA
Internal
Regulator
Oscillator
400kHz/120kHz
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
www.richtek.com
2
DS8268-02 March 2011
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