MB39C308 Datasheet, PDF (18/60 Pages) Fujitsu Component Limited. – 6ch DC/DC Converter IC for LPIA Platform VR

MB39C308
(Continued)
Parameter
CH6 efficiency
CH6 block
[CH6]
Vo6 output over
voltage threshold
Vo6 over
current limit
FB6 input resistance
Soft start time
(Ta = + 25 °C, AVDD = PVDD1 to PVDD7 = 7.2 V)
Symbol
Condition
Value
Unit
Min Typ Max
ηL61
DVSEL6 pin = “H” Level,
Vo6 = 1.1 V
0.05 × Io (Max) < Io <
0.3 × Io (Max)
80*³
⎯
⎯
%
ηL62
DVSEL6 pin = “L” Level,
Vo6 = 1.05 V
0.05 × Io (Max) < Io <
0.3 × Io (Max)
80*³
⎯
⎯
%
ηT61
DVSEL6 pin = “H” Level,
Vo6 = 1.1 V
0.3 × Io (Max) < Io <
0.6 × Io (Max)
82*³
⎯
⎯
%
ηT62
DVSEL6 pin = “L” Level,
Vo6 = 1.05 V
0.3 × Io (Max) < Io <
0.6 × Io (Max)
82*³
⎯
⎯
%
DVSEL6 pin = “H” Level,
ηF61 Vo6 = 1.1 V
81*³
⎯
⎯
%
0.6 × Io (Max) < Io < Io (Max)
DVSEL6 pin = “L” Level,
ηF62 Vo6 = 1.05 V
81*³
⎯
⎯
%
0.6 × Io (Max) < Io < Io (Max)
VOVP6
DVSEL6 pin = “H” Level,
Vo6 = 1.1 V, FB6 pin
DVSEL6 pin = “L” Level,
Vo6 = 1.05 V, FB6 pin
1.298*¹ 1.32*¹ 1.342*¹ V
1.239*¹ 1.26*¹ 1.281*¹ V
IOCP6
IO6,
L = 1.5 μH
4.0*¹ 5.0*¹ 6.0*¹
A
RFB6 FB6 pin
⎯
350
⎯
kΩ
SS6
FB6 pin,
SS1 = SS2 = AGND pin
1.19 1.4 1.61 ms
*1 : This parameter isn't be specified. This should be used as a reference to support designing the circuits.
*2 : FSEL4 pin is typically recommended to set to “H” level for fosc = 700 kHz setting. When Vo4 is preset to
0.75 V, the ON duty becomes so small at high input voltage. Then, there is a case CH4 output regulation
becomes worse at light load condition. In that case, please set FSEL4 pin to “L” level for fosc = 350 kHz setting.
*3 : This is a reference value, which is evaluated by the recommended EVB circuit. This should be used as a
reference to support designing the circuits.
18
DS04-27261-6E