R1218XXX1A RICOH [RICOH electronics devices division], R1218XXX1A Datasheet - Page 2

• Manufacturer Part Number: R1218XXX1A
• Description: Step-up DC/DC converter for Whilte LED Backlight
• Manufacturer: RICOH [RICOH electronics devices division]

2
BLOCK DIAGRAMS
R1218X
R1218XXX1A
R1218XXX2A
V V V V ref
Vref
Vref
Vref
Vref
ref
ref
ref
V V V V
V V V V FB
FB
FB
FB
FB
FB
FB
FB
Err. Amp
Err. Amp
+
–
Shu tdown
delay
+
–
delay
Shutdown
PWM Comp
PWM Comp
+
–
+
–
CE
CE
CE
CE
Com
Compensation
Slope
Slope
Com
Com
Slope
Slope
Slope
Slope
Compensation
Com
Slope
Slope
Com
Com
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
Control
Control
UVLO
Control
Control
Current
Current
sense
sense
Current
Current
s s s s ense
Current
Current
sense
sense
Current
Current
ense
ense
ense
GND
GND
L
L
X
X
OVP
OVP
V
V
OUT
OUT