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参数资料
| 型号： | MAX8795A+ |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 1.6 A SWITCHING REGULATOR, 1400 kHz SWITCHING FREQ-MAX, QCC32 |
| 封装： | 5 X 5 MM, 0.80 MM HEIGHT, LEAD FREE, MO-220WHHD-2, TQFN-32 |
| 文件页数： | 7/24页 |
| 文件大小： | 387K |
| 代理商： | MAX8795A+ |
1.25V (typ), the switch-control block is enabled as
shown in Figure 6. After the switch-control block is
enabled, COM can be connected to SRC or DRN
through the internal p-channel switches, depending
upon the state of CTL. Before startup and when IN is
less than VUVLO, DEL is internally connected to AGND
to discharge CDEL. Select CDEL to set the delay time
using the following equation:
Switch-Control Block
The switch-control input (CTL) is not activated until all
four of the following conditions are satisfied: the input
voltage exceeds VUVLO, the soft-start routine of all the
regulators is complete, there is no fault condition detect-
ed, and VDEL exceeds its turn-on threshold. Once acti-
vated and if CTL is high, the 5
internal p-channel
switch (Q1) between COM and SRC turns on and the
30
p-channel switch (Q2) between DRN and COM
turns off. If CTL is low, Q1 turns off and Q2 turns on.
C
DELAY TIME
A
V
DEL =×
_
.
5
125
MAX8795A
TFT-LCD DC-DC Converter with
Operational Amplifiers
_
__
_
1
15
5
12ms
2.25V
1.05V
1.25V
VIN
VREF
VMAIN
VGON
VGOFF
VDEL
SWITCH
CONTROL
ENABLED
SOFT-
START
ENDS
SOFT-
START
BEGINS
INPUT
VOLTAGE
OK
Figure 6. Power-Up Sequence
MAX8795A
FB OK
FBP OK
FBN OK
2.25V
5
A
REF
DRN
COM
SRC
Q1
Q2
CTL
DEL
IN
Figure 7. Switch-Control Block
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