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AN30185A-EVB-0

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
AN30185A
10
Ver. BEB
OPERATION
BUF(0.9V)
DC-DC2(1.8V)
External Pch-MOSFE
Gate control circuit
OFF
OFF
OFF
OFF
Low
OFF
OFF
ON
ON
Low
OFFON
OFFON
HighHighEN2
OFFONDC-DC1(1.0V)
OFFON
LowHighEN
EN pin is the main control pin. When EN pin becomes High, DC-DC1 and external Pch-MOSFET gate control circuit
turn on,and DC-DC2 and BUF become controllable by EN2 pin.
EN2 pin is the control pin for DC-DC2 and BUF. When EN2 pin becomes High, DC-DC2 and BUF turn on.
Even if EN2 is High under the condition that EN is Low, DC-DC2 and BUF do not turn on.
1. Pin Setting For Start / Stop Control
AN30185A
11
Ver. BEB
Start / Stop control sequence by EN pin under the condition that EN2 pin is fixed to High is as follows.
Note) All values given in the above figure are typical values.
V
IN
EN
UVLO
RESET
FB1
PCNT
FB2
BUF
30 ms
1.0 V
0.94 ms
V
IN
V
IN
3.3 V
3.75 ms
0.47 ms
1.8 V
0.9 V
100 μs
300 μs
150 μs
50 μs
2.81 ms
EN2
4.22 ms
Constant current
discharge (2.5 μA)
DIS
(3.3 V line)
Terminated
with a resistor
Terminated
with a resistor
Terminated
with a resistor
Terminated
with a resistor
OPERATION (Continued)
2. Start / Stop Control Timing Chart
Note) The characteristics listed below are reference values derived from the design of the IC and are not guaranteed.
AN30185A
12
Ver. BEB
Start / Stop sequence in case that EN pin and EN2 pin are connected to power supply (V
IN
) is as follows.
Note) All values given in the above figure are typical values.
FB1
PCNT
FB2
BUF
1.0 V
0.94 ms
V
IN
V
IN
3.3 V
3.75 ms
0.47 ms
1.8 V
0.9 V
100 μs
300 μs
150 μs
50 μs
2.81 ms
EN2
4.22 ms
2.5 V
2.6 V
2.81 V
2.92 V
V
IN
EN
UVLO
RESET
30 ms
0.85 V
Constant current
discharge (2.5 μA)
Natural
discharge
Terminated
with a resistor
Terminated
with a resistor
Natural
discharge
Terminated
with a resistor
DIS
(3.3 V line)
Natural
discharge
Terminated
with a resistor
OPERATION (Continued)
2. Start / Stop Control Timing Chart
Note) The characteristics listed below are reference values derived from the design of the IC and are not guaranteed.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

AN30185A-EVB-0

Mfr. #:
Buy AN30185A-EVB-0
Manufacturer:
Panasonic
Description:
Other Development Tools Multi DCDC Eval Board AN30185A-VL
Lifecycle:
New from this manufacturer.
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