MB39A115 Datasheet, PDF (6/42 Pages) Fujitsu Component Limited. – 5 ch DC/DC Converter IC with Synchronous Rectification

MB39A115
■ BLOCK DIAGRAM
−INE1 37
CS1 38
L
VREF priority
Error
10 µA
− ^Amp1
++
FB1 36
1.0 V
Threshold voltage
1.0 V ± 1%
−INE2 2
CS2 1
L
VREF ^priority Error
10 µA
− ^Amp2
++
FB2 3
DTC2 4
1.23 V
Threshold voltage
1.23 V ± 1%
PWM
+ ^Comp.1
−
<<ch.1>>
Io = 300 mA
at VCCO = 7 V
Drive1-1
P-ch
35 VCCO
34 OUT1-1
Dead Time
(td = 50 ns)
Drive1-2
N-ch
Io = 300 mA
at VCCO = 7 V
L
priority
PWM
++ ^Comp.2
−
<<ch.2>>
Drive2
P-ch
33 OUT1-2
32 OUT2
Io = 300 mA
at VCCO = 7 V
−INE3 18
CS3 19
FB3 17
DTC3 16
L
VREF ^priority _Error
1 µA
− ^Amp3
++
1.23 V
Threshold voltage
1.23 V ± 1%
L
priority
PWM
++ ^Comp.3
−
<<ch.3>>
Drive3
P-ch
31 OUT3
Io = 300 mA
at VCCO = 7 V
−INE4 21
CS4 20
FB4 22
DTC4 23
L
VREF ^priority Error
1 µA
− ^Amp4
++
1.23 V
Threshold voltage
1.23 V ± 1%
L
priority
PWM
++ ^Comp.4
−
<<ch.4>>
Drive4
P-ch
30 OUT4
Io = 300 mA
at VCCO = 7 V
−INE5 26
CS5 27
L
VREF ^priority _Error
1 µA
− ^Amp5
++
1.23 V
L
priority
PWM
++ ^Comp.5
−
<<ch.5>>
Drive5
N-ch
FB5 25
DTC5 24
−INS 10
Short-circuit
detection signal
(L : at short-circuit)
CSCP 15
Threshold voltage
1.23 V ± 1%
100
VREF
kΩ
−
SCP
Comp.
1V ⁺
0.9 V
CTL3 7
CTL4 8
CTL5 9
0.4 V
CHCTL
OSC
12 13
RT CT
Io = 300 mA
at VCCO = 7 V
H: at SCP
SCP
H : release
UVLO
UVLO2
UVLO1
Error Amp Power supply
SCP Comp. Power supply
Error Amp Reference
bias ^{1.23 V}
VREF
Power
VR ON/OFF
CTL
2.0 V
11
Accuracy
± 0.8%
14
VREF
GND
29 OUT5
28 GNDO
5 VCC
6 CTL
H : ON (Power ON)
L : OFF (standby mode)
VTH = 1.0 V
6