MB39A123 Datasheet, PDF (34/44 Pages) Fujitsu Component Limited. – 6 ch DC/DC Converter IC with Synchronous Rectification

MB39A123
■ ABOUT THE LOW VOLTAGE OPERATION
1.7 V or more is necessary for the VCC terminal (pin 48) and the VCCO terminal (pin 36) for the self-power
supply type to use the step-up circuit as the start voltage.
Even if thereafter VIN voltage decreases to 1.5 V, operation is possible if the VCC terminal (pin 48) voltage and
the VCCO terminal (pin 36) voltage rise to 2.5 V or more after start-up. However, it is necessary not to exceed
the maximum duty set value by the duty due to the VIN decrease. Including other channels, execute an enough
operation margin confirmation when using it.
A
R1
21
R2 ^−INE5
CS5
20
DTC5
23
VREF
Error
− ^Amp5
++
1.23 V
<<ch.5>>
PWM
Comp.5
++
−
Drive5
N-ch
Max Duty
92% ± 5%
0.9 V
0.4 V
VIN
VCCO
36
30 ^OUT5
VCC
48
Step-up _A
Vo5
(5 V)
34