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| 型号： | MAX17019ATM+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 20/25页 |
| 文件大小： | 0K |
| 描述： | IC VOLT CTRL QUAD OUT 48-TQFN-EP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 嵌入式系统，控制台/机顶盒 |
| 电源电压： | 5.5 V ~ 38 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 48-WFQFN 裸露焊盘 |
| 供应商设备封装： | 48-TQFN-EP（6x6） |
| 包装： | 带卷 (TR) |
High-Input-Voltage Quad-Output Controller
VTT LDO Detailed Description
VTT LDO Power-Good Output (POKD)
POKD is the open-drain output of a window comparator
that continuously monitors the VTT LDO output for
undervoltage and overvoltage conditions. POKD is
actively held low when the VTT LDO is disabled (OND
= GND) and in soft-start. Once the startup blanking
time expires, POKD becomes high impedance as long
as the output remains within ±6% (min) of the nominal
regulation voltage set by REFIND. POKD goes low once
its corresponding output drops or rises 12% (typ)
beyond its nominal regulation point or the output is shut
down. For a logic-level POKD output voltage, connect
an external pullup resistor between POKD and LDO5. A
100k Ω pullup resistor works well in most applications.
VTT LDO Fault Protection
LDO Output OVP
If the output voltage rises above 112% (typ) of its nomi-
nal regulation voltage, the controller sets the fault latch,
pulls POKD low, shuts down the source/sink linear reg-
ulator, and immediately pulls the output to ground
through its low-side MOSFET. Turning on the low-side
MOSFET with 100% duty cycle rapidly discharges the
output capacitors and clamps the output to ground.
Cycle V CC below 1V or toggle OND to clear the fault
latch and restart the linear regulator.
LDO Output UVP
Each MAX17019 includes an output UVP circuit that
begins to monitor the output once the startup blanking
period has ended. If the source/sink LDO output voltage
drops below 88% (typ) of its nominal REFIND regulation
voltage for 5ms, the UVP sets the fault latch, pulls the
POKD output low, forces the output into a high-
impedance state, and shuts down the linear regulator.
Cycle V CC below 1V or toggle OND to clear the fault
latch and restart the regulator.
SMPS Design Procedure
(Step-Down Regulators)
? Input voltage range. The maximum value (V IN(MAX) )
must accommodate the worst-case, high AC-
adapter voltage. The minimum value (V IN(MIN) ) must
account for the lowest battery voltage after drops
due to connectors, fuses, and battery selector
switches. If there is a choice at all, lower input volt-
ages result in better efficiency.
? Maximum load current. There are two values to con-
sider. The peak load current (I LOAD(MAX) ) determines
the instantaneous component stresses and filtering
requirements and thus drives output capacitor selec-
tion, inductor saturation rating, and the design of the
current-limit circuit. The continuous load current
(I LOAD ) determines the thermal stresses and thus
drives the selection of input capacitors, MOSFETs,
and other critical heat-contributing components.
? Switching frequency. This choice determines the
basic trade-off between size and efficiency. The
optimal frequency is largely a function of maximum
input voltage, due to MOSFET switching losses that
are proportional to frequency and V IN2 .
? Inductor operating point. This choice provides
trade-offs between size vs. efficiency and transient
response vs. output ripple. Low inductor values pro-
vide better transient response and smaller physical
size, but also result in lower efficiency, higher output
ripple, and lower maximum load current due to
increased ripple currents. The minimum practical
inductor value is one that causes the circuit to oper-
ate at the edge of critical conduction (where the
inductor current just touches zero with every cycle at
maximum load). Inductor values lower than this
grant no further size-reduction benefit. The optimum
operating point is usually found between 20% and
50% ripple current. When pulse skipping (light
loads), the inductor value also determines the load-
current value at which PFM/PWM switchover occurs.
Step-Down Inductor Selection
The switching frequency and inductor operating point
determine the inductor value as follows:
V IN SW LOAD ( MAX ) LIR
Firmly establish the input voltage range and maximum
load current before choosing a switching frequency
and inductor operating point (ripple-current ratio). The
primary design trade-off lies in choosing a good switch-
L =
V OUT ( V IN - V OUT )
f I
ing frequency and inductor operating point, and the fol-
lowing four factors dictate the rest of the design:
Find a low-loss inductor having the lowest possible DC
resistance that fits in the allotted dimensions. Most
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17019EVKIT+ | 功能描述:电源管理IC开发工具 Maxim Evaluation 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 |
| MAX17019NEVKIT+ | 功能描述:电源管理IC开发工具 Maxim Evaluation 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 |
| MAX1701EEE | 功能描述:直流/直流开关转换器 1-3 Cell 1A Step-Up DC/DC Converters RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1701EEE+ | 功能描述:直流/直流开关转换器 1-3 Cell 1A Step-Up DC/DC Converters RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX1701EEE+T | 功能描述:直流/直流开关转换器 1-3 Cell 1A Step-Up DC/DC Converters RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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