R1218K021A RICOH [RICOH electronics devices division], R1218K021A Datasheet - Page 2

• Manufacturer Part Number: R1218K021A
• Description: Step-up DC/DC converter for White LED Backlight
• Manufacturer: RICOH [RICOH electronics devices division]

2
BLOCK DIAGRAMS
R1218x
V
V
Vref
Vref
FB
FB
Error Amp
Error Amp
Shutdown
Shutdown
delay
delay
PWM Comp
PWM Comp
Chip Enable
Chip Enable
CE
CE
Compensation
Compensation
R
R
OSC
Slope
OSC
Slope
Σ
Σ
S
S
R1218xxx1A
R1218xxx2A
Q
Q
V
V
IN
IN
Current
Current
Control
Protect
Control
Protect
UVLO
Switch
UVLO
Switch
GND
GND
Current
Current
sense
sense
L
L
X
X
V
V
OVP
OVP
OUT
OUT