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| 型號(hào)： | AS1344-BTDT |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 42V DCDC for OLED; Package Type: TDFN(3x3)-10 |
| 封裝： | TDFN(3x3)-10 |
| 文件頁(yè)數(shù)： | 11/19頁(yè) |
| 文件大小： | 1807K |
| 代理商： | AS1344-BTDT |
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Revision 1.05
11 - 19
AS1344
Datasheet - Application Information
9 Application Information
Shutdown and Output Discharge
A logic low on the EN pin shuts down the AS1344 and a logic high on the EN pin powers on the device. In shutdown
mode the supply current drops to below 3μA and the POK pin is set to high impedance to maximize battery life.
When the battery disconnect switch is used, the battery is disconnected from the output and the output is discharged
down to 0V. The time for fully discharging the output depends on the C
OUT
and on the load.
Note:
Pin EN should not be left floating. If the shutdown feature is not used, connect EN to V
CC
. The output will be
discharged during shutdown but the output also must be fully discharged before the device is enabled again.
Battery Disconnect
The AS1344 has an integrated PMOS switch that can be used to disconnect the battery during shutdown. The opera-
tion voltage of this switch is limited to 3.6V. When EN is high, the switch is closed and supplies the inductor. Due to the
R
ON
resistance the efficiency is slightly lower if the battery disconnect switch is used.
P
LOSS
= I
IN
2 x
R
ON
(EQ 1)
Softstart Function
To limit the input current during startup a resistor R
V
can be connected between the pins VIN and VCC. For the corre-
lation between the resistor value, the supply voltage and the startup time see
Figure 33
. For the correlation between
resistor value, the supply voltage and the peak current see
Figure 34
. Connect VIN directly to VCC (no resistor) to dis-
able the softstart Function.
As an example some peak current and time values are listed at a given Rv in
Table 4
.
Table 4. Timing for Softstart @ V
CC
= 2.4V, C
OUT
= 155μF,
R
V
[
Ω
]
I
PEAK
[A]
t [ms]
0
1.0
0.81
76
1.5
0.66
100
2.0
0.56
130
2.4
0.50
156
3.0
0.42
204
1.76
25
Figure 33. Startup Time; C
IN
= 150μF, C
OUT
= 155μF
800
Figure 34. Peak Current; C
IN
= 10μF, C
OUT
= 155μF
3.5
0
100
200
300
400
500
600
700
1
1.4
1.8
2.2
2.6
3
3.4
Input Voltage (V)
S
0 Ohm
1.0 Ohm
1.5 Ohm
2.0 Ohm
2.4 Ohm
3.0 Ohm
0
0.5
1
1.5
2
2.5
3
1
1.4
1.8
2.2
2.6
3
3.4
Input Voltage (V)
P
0 Ohm
1.0 Ohm
1.5 Ohm
2.0 Ohm
2.4 Ohm
3.0 Ohm
5.1 Ohm
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