R1234D Datasheet, PDF (22/26 Pages) RICOH electronics devices division – PWM/VFM Step-Down DC/DC CONVERTER with Synchronous Rectifier

R1234D
12) UVLO Threshold vs. Temperature
2.3
2.2
2.1
2.0
1.9
UVLO Released Voltage
UVLO Threshold Voltage
1.8
-40 -25 0
25 50
Temperature Topt(°C)
75 85
13) CE Input Voltage vs. Temperature
1.6
1.4
1.2
1.0
0.8
0.6
0.4
CE Input Voltage(V) "H"
0.2
CE Input Voltage(V) "L"
0
-40 -25 0
25 50
Temperature Topt(°C)
75 85
14) Mode Input Voltage vs. Temperature
1.6
1.4
1.2
1.0
0.8
0.6
0.4
MODE Input Voltage "H"
0.2
MODE Input Voltage "L"
0
-40 -25 0
25 50
Temperature Topt(°C)
75 85
15) Maximum Duty Cycle at VFM Mode vs. Temperature
80
75
70
65
60
55
50
-40 -25 0
25 50
Temperature Topt(°C)
75 85
16) Lx Transistor On Resistance vs. Temperature
17) Lx Limit Voltage vs. Temperature
1.00
0.75
NchTr
0.50
0.25
PchTr
0
-40 -25 0
25 50
Temperature Topt(°C)
75 85
0.40
0.35
0.30
0.25
0.20
0.15
0.10
-40 -25 0
25 50
Temperature Topt(°C)
75 85
22