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参数资料
| 型号： | MAX17075ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/23页 |
| 文件大小： | 0K |
| 描述： | IC DC-DC CONV W/CHRG PUMP 24TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | LCD 电视机/监控器 |
| 电流 - 电源： | 4mA |
| 电源电压： | 2.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
MAX17075
Boost Regulator with Integrated Charge Pumps,
Switch Control, and High-Current Op Amp
Short-Circuit Current Limit and Input Clamp
The operational amplifier limits short-circuit current to
approximately ±500mA if the output is directly shorted
to SUP or to BGND. If the short-circuit condition per-
sists, the junction temperature of the IC rises until it
reaches the thermal-shutdown threshold (+160°C typ).
Once the junction temperature reaches the thermal-
shutdown threshold, an internal thermal sensor immedi-
ately sets the thermal fault latch, shutting off all the IC’s
outputs. The device remains inactive until the input volt-
age is cycled. The operational amplifier has 4V input
clamp structures in series with a 500 ? resistance and a
diode (Figure 6).
Driving Pure Capacitive Load
The operational amplifier is typically used to drive the
LCD backplane (VCOM) or the gamma-correction
divider string. The LCD backplane consists of a distrib-
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 capaci-
tive load increases, the amplifier’s bandwidth decreas-
es and gain peaking increases. A 5 ? to 50 ? small
resistor placed between OUT and the capacitive load
MAX17075
reduces peaking, but also reduces the gain. An alterna-
tive method of reducing peaking is to place a series RC
network (snubber) in parallel with the capacitive load.
The RC network does not 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 10nF.
High-Voltage Switch Control
The MAX17075 ’s high-voltage switch control block
(Figure 7) consists of two high-voltage p-channel
MOSFETs: Q1, between SRC and COM; and Q2,
between COM and DRN. At power-up and only at
power up, before the switch control is enabled (a 1.5k ?
pulldown is present on COM). At switch-off, COM is
high impedance.
The switch control input (CTL) is not activated until all
four of the following conditions are satisfied: the input
voltage exceeds UVLO, the soft-start routine of all the
regulators is complete, there is no fault condition
detected, and V DEL exceeds its turn-on threshold.
Once activated and if CTL is logic-high, Q1 turns on
and Q2 turns off, connecting COM to SRC. When CTL
is logic-low, Q1 turns off and Q2 turns on, connecting
COM to DRN.
VCC
5 μ A
DEL
2.25V
SUP
POS
V REF
Q3
FAULT
REF_OK
Q1
SRC
± 4V
COM
500 ?
NEG
MAX17075
SWITCH CONTROL
Q2
1.5k ?
OUT
BGND
DRN
OP AMP INPUT CLAMP STRUCTURE
CTL
Q4
Figure 6. Op Amp Input Clamp Structure
16
Figure 7. Switch Control
Maxim Integrated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17075EVKIT+ | 功能描述:电源管理IC开发工具 MAX17075 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MAX17077AETM+ | 功能描述:低压差稳压器 - LDO Hybrid 500mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX17077AETM+T | 功能描述:低压差稳压器 - LDO Hybrid 500mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MAX17077AETM+W | 制造商:Maxim Integrated Products 功能描述:INTERNAL-SWITCH BOOST REGULATOR - Rail/Tube |
| MAX17077ETM+ | 功能描述:低压差稳压器 - LDO Hybrid 500mA RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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