MB39A115 Datasheet, PDF (29/42 Pages) Fujitsu Component Limited. – 5 ch DC/DC Converter IC with Synchronous Rectification

MB39A115
■ ABOUT THE LOW VOLTAGE OPERATION
1.7 V or more is necessary for the VCC terminal (pin 5) and the VCCO terminal (pin 35) 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 voltage and the
VCCO terminal 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
26
−INE5
R2
CS5
VREF ²⁷
R4
DTC5
24
Max Duty ^R5
setting
Error
− ^Amp5
++
1.23 V
<<ch.5>>
PWM
Comp.5
++
−
Drive5
N-ch
0.9 V
0.4 V
VIN
VCCO
35
29 ^OUT5
VCC
5
Step-up _A
Vo5
(5 V)
29