rt9218b Richtek Technology Corporation, rt9218b Datasheet - Page 4

• Manufacturer Part Number: rt9218b
• Description: Synchronous Buck Dc-dc Linear Power Controller
• Manufacturer: Richtek Technology Corporation

RT9218B
Timing Diagram
www.richtek.com
4
Function Block Diagram
PGOOD
DRV
FBL
FB
FSB_VTT (1.2V @ 5Amp)
(3V_Logic & 3VDD_Analog)
Bias & Regulators
VCC
+
-
VTT_GD
0.6V
0.6V
Specific Power Sequence for LDO
90%
Reference
+
+
-
-
+
+
-
GM
1-10ms
0.8V
UV_S
UV_L
REF
EO
Fault Logic
Power On
Soft-Start
Reset
VCC
&
(300k/600kHz)
Oscillator
GND
+
+
-
OC
PH_M
EN
-
+
Gate Control
+
-
+
-
0.4V
3V
+
-
Logic
1.5V
0.15V
40uA
<1ms
DS9218B-09 March 2007
80%
VCC
OPS
BOOT
UGATE
PHASE
LGATE