R1218X Ricoh Corporation, R1218X Datasheet - Page 2

• Manufacturer Part Number: R1218X
• Description: Step Up DC/DC Converter
• Manufacturer: Ricoh Corporation

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DataSheet
2
R1218X
BLOCK DIAGRAMS
4
R1218XXX1A
R1218XXX2A
U
V V V V ref
Vref
Vref
Vref
Vref
ref
ref
ref
.com
V V V V
V V V V FB
FB
FB
FB
FB
Err. Amp
FB
FB
FB
Err. Amp
+
–
Shu tdown
delay
+
–
delay
Shutdown
PWM Comp
PWM Comp
+
–
+
–
CE
CE
CE
CE
Compensation
Com
Slope
Slope
Com
Com
Slope
Slope
Slope
Slope
Slope
Slope
Com
Com
Com
Compensation
Oscillator
Oscillator
R
R
pensation
pensation
pensation
pensation
pensation
pensation
S
S
Q
Q
V V V V
V V V V IN
IN
IN
IN
IN
IN
IN
IN
Switch
Switch
Switch
Switch
Current
Current
Current
Current
Protect
Protect
Protect
Protect
Switch
Switch
Control
Control
Current
Current
Current
Current
Protect
Protect
Protect
Protect
Switch
Switch
Control
Control
UVLO
UVLO
Control
Control
Control
Control
Current
Current
Current
Current
sense
sense
sense
sense
Current
Current
Current
Current
s s s s ense
ense
ense
ense
GND
GND
L
L
X
X
OVP
OVP
V
V
OUT
OUT