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参数资料
| 型号： | MAX8664AEEP+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 10/26页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR DUAL OUT 20-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 电源 |
| 电流 - 电源： | 1.4mA |
| 电源电压： | 4.5 V ~ 28 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 20-QSOP |
| 包装： | 带卷 (TR) |
Low-Cost, Dual-Output, Step-Down
Controller with Fast Transient Response
The threshold that trips overcurrent protection is set by a
resistor connected from ILIM_ to the drain of the high-
side MOSFET(s). ILIM_ sinks 50μA (typ) through this
resistor. When the drain-source voltage exceeds the volt-
age drop across this resistor during the high-side
MOSFET(s) on-time, an overcurrent fault is triggered. To
prevent glitches from falsely tripping the overcurrent pro-
tection, connect a filter capacitor (0.01μF typically) in
parallel with the overcurrent-setting resistor.
Output Overvoltage Protection (OVP)
During an overvoltage event on one or both of its out-
puts, the MAX8664 latches off the controller. This
occurs when the feedback voltage exceeds its normal
regulation voltage by 150mV for 10μs. In this state, the
low-side MOSFET(s) are on and the high-side MOS-
FET(s) are off to discharge the output. To clear the
latch, cycle EN or the input power.
Thermal-Overload Protection
Thermal-overload protection limits total power dissipa-
tion in the MAX8664. When the junction temperature
exceeds +160°C, an internal thermal sensor shuts down
Power-Good Output (PWRGD)
PWRGD is an open-drain output that is pulled low when
the output voltage rises above the PWRGD upper
threshold or falls below the PWRGD falling threshold.
PWRGD is held low in shutdown, when V CC is below the
UVLO threshold, during soft-start, and during fault con-
ditions. PWRGD does not reflect the status of controller
2 in the MAX8664A, or when REFIN2 is connected to an
external reference with either version. See Table 1 for
PWRGD operation of the circuits of Figures 2–5 during
fault conditions. For logic-level output voltages, con-
nect an external pullup resistor between PWRGD and
the logic power supply. A 100k Ω resistor works well in
most applications.
Fault-Shutdown Modes
When an overvoltage or overcurrent fault occurs on one
controller of the MAX8664A, the second controller con-
tinues to operate. With the MAX8664B, a fault in one
controller latches off both controllers automatically, and
PWRGD is pulled low. See Table 1 for the fault-shut-
down modes of the circuits shown in Figures 2–5.
the device, pulling DH_ and DL_ low for both controllers.
To restart the controller, cycle EN or input power.
Table 1. Fault Shutdown Modes for Circuits of Figures 2–5
CIRCUIT
MAX8664A (INDEPENDENT)
CONTROLLER 1 FAULT CONTROLLER 2 FAULT
MAX8664B (JOINT)
CONTROLLER 1 FAULT CONTROLLER 2 FAULT
Figure 2,
Figure 5
(Independent)
Figure 3
(Tracking)
Figure 4
(Sequenced)
Controller 2 remains on.
PWRGD is pulled low.
Controller 2 shuts down.
PWRGD is pulled low.
Controller 2 shuts down.
PWRGD is pulled low.
Controller 1 remains on.
PWRGD remains high.
Controller 1 remains on.
PWRGD remains high.
Controller 1 remains on.
PWRGD remains high.
Controller 2 is shut down.
PWRGD is pulled low.
Controller 2 is shut down.
PWRGD is pulled low.
Controller 2 is shut down.
PWRGD is pulled low.
Controller 1 is shut down.
PWRGD is pulled low.
Controller 1 is shut down.
PWRGD is pulled low.
Controller 1 is shut down.
PWRGD is pulled low.
10
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| MAX8664BEEP+ | 功能描述:DC/DC 开关控制器 Dual-Output Step Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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| MAX8667ETEAA+T | 功能描述:直流/直流开关转换器 1.5MHz Dl Step-Down DC/DC Converter 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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