参数资料
型号: MAX8795AETJ+C7P
厂商: Maxim Integrated Products
文件页数: 19/31页
文件大小: 0K
描述: IC TFT-LCD DC/DC CONV 32-TQFN
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 60
应用: 转换器,TFT,LCD
输入电压: 2.5 V ~ 6 V
输出数: 8
输出电压: 2.5 V ~ 18 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 32-WFQFN 裸露焊盘
供应商设备封装: 32-TQFN-EP(5x5)
包装: 管件
TFT-LCD DC-DC Converter with
Operational Amplifiers
C DEL . Once the C DEL capacitor voltage exceeds 1.25V
(typ), the switch-control block is and op amps are enabled
2.25V
V IN
as shown in Figure 6. After the switch-control block is
enabled, COM can be connected to SRC or DRN through
1.05V
V REF
V MAIN
the internal p-channel switches, depending upon the state of
CTL. Before startup and when IN is less than V UVLO , DEL is
internally connected to AGND to discharge C DEL . Select
C DEL to set the initial start-up delay and the switch-control
block startup delay times using the following equation:
V GON
C DEL = DELAY _ TIME ×
I 6 μ A
1 . 25 V
Switch-Control Block
12ms
1.25V
V GOFF
V DEL
The switch-control input (CTL) is not activated until all
four of the following conditions are satisfied: the input
voltage exceeds V UVLO , the soft-start routine of all the
INPUT
SOFT-
SOFT-
SWITCH
regulators is complete, there is no fault condition detect-
VOLTAGE
OK
START START
BEGINS ENDS
CONTROL
ENABLED
ed, and V DEL 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
Figure 6. Power-Up Sequence
IN
MAX8795A
5 μ A
2.25V
FB OK
FBP OK
FBN OK
Q1
SRC
DEL
REF
COM
CTL
Q2
DRN
Figure 7. Switch-Control Block
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19
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