RT8805 데이터 시트보기 (PDF) - Richtek Technology
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RT8805 Datasheet PDF : 15 Pages
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RT8805
Preliminary
Typical Application Circuit
3.3VCC
12VCC
R8
RT8805
9 PGOOD BOOT1 2
R9
14 VCC
C9
UGATE1 1
R1
R2
C1
C2 R3
5 RT
4 IMAX
3
AGND
8
FB
7 COMP
PHASE1 16
LGATE1 15
10
BOOT2
UGATE2 11
6 SS
PHASE2 12
13
EN
Q5 C3
GND
LGATE2
VIN
C5
C4
Q1
L1
Q2
VOUT
C8
C6
Q3
C7
L2
Q4
R4
R5
Function Block Diagram
PGOOD
FB
COMP
SS
AGND
IMAX
VCC
RT
www.richtek.com
2
0.8V +
EA
-
External
Soft Star
CLK1
Reg
Clock
VCC
PWMCP
-
+
PWM1
Logic
VCC
VCC
PWMCP
+
PWM2
-
Logic
VCC
RAMP1 RAMP2
CLK2
Current
Balance
OCP
VDD OC
CLK1
CLK2
- MUX PHASE2
S/H
GM
PHASE1
+
To PWM Logic
PGOOD
Central
Logic
OC
BOOT1
UGATE1
PHASE1
LGATE1
BOOT2
UGATE2
PHASE2
LGATE2
GND
DS8805-01 November 2005
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