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参数资料
| 型号： | MAX8739ETP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 14/19页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC CONV W/OPAMP 20TQFN-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 1.8 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 1.8 V ~ 13 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-WQFN 裸露焊盘 |
| 供应商设备封装： | 20-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
TFT, LCD, DC-DC Converter with
Operational Amplifiers
uted series capacitance and resistance, a load that can
be easily driven by the operational amplifier. However,
if the operational amplifier is used in an application with
a pure capacitive load, steps must be taken to ensure
stable operation.
As the operational amplifier’s capacitive load increases,
the amplifier’s bandwidth decreases and gain peaking
increases. A 5 ? to 50 ? resistor placed between OUT_
regulator is complete, a 5μA current source charges
C DEL . Once the capacitor voltage exceeds V REF (1.25V
typ), 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
V UVLO , DEL is internally connected to AGND to dis-
charge C DEL . Select C DEL to set the delay time using
the following equation:
and the capacitive load reduces peaking but also
reduces the gain. An alternative method of reducing
peaking is to place a series RC network (snubber) in par-
allel with the capacitive load. The RC network does not
C DEL = DELAY _ TIME x
5 μ A
1 . 25 V
continuously load the output or reduce the gain. Typical
values of the resistor are between 100 ? and 200 ? and
the typical value of the capacitor is 10pF.
Switch Control and Delay
A capacitor C DEL (C8 in Figure 1), from DEL to AGND
selects the switch-control block supply startup delay.
After the LDO voltage exceeds its undervoltage lockout
threshold (2.7V typ) and the soft-start routine for each
LDO
5 μ A
DLP
REF
The switch-control input (CTL) is not activated until all
three of the following conditions are satisfied: the LDO
voltage exceeds its undervoltage lockout voltage, the
soft-start routine of all the regulators is complete, and
V DEL exceeds its turn-on threshold. Once activated and
if CTL is high, the 15 ? internal p-channel switch
between COM and SRC (Q1) turns on and the 30 ? p-
channel switch between DRN and COM (Q2) turns off.
If CTL is low, Q1 turns off and Q2 turns on.
2.7V
SRC
Q1
COM
CTL
Q2
DRN
Figure 4. Switch Control
14
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