R1218N021A Datasheet, PDF (14/21 Pages) RICOH electronics devices division – Step-up DC/DC converter for White LED Backlight

R1218x
10) Oscillator Frequency vs. Temperature
1400
R1218x041A
VIN=3.6V
1350
1300
1250
1200
1150
1100
1050
1000
-40 -25
0
25 50
Temperature Topt (°C)
75 85
11) Maximum duty cycle vs. Temperature
R1218x041A
VIN=3.6V
99
97
95
93
91
89
87
85
-40 -25
0
25 50
Temperature Topt (°C)
75 85
12) OVP Detector Threshold/Released Voltage vs. Temperature
R1218x041A
20.5
VIN=3.6V
20.0
19.5
19.0
OVP Detector Threshold
18.5
18.0
OVP Released Voltage
17.5
17.0
16.5
-40 -25
0
25 50
Temperature Topt (°C)
75 85
13) Supply Current vs. Temperature
R1218x041A
VIN=3.6V
360
320
280
240
200
160
120
80
40
0
-40 -25
0
25 50
Temperature Topt (°C)
75 85
14) LX Current Limit vs. Temperature
R1218x041A
1000
VIN=3.6V
900
800
700
600
500
400
300
-40 -25
0
25 50
Temperature Topt (°C)
75 85
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