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参数资料
| 型号： | MAX1946ETA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC USB SW SGL AUTORESET 8TDFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 应用： | USB，外设 |
| 电流 - 电源： | 40µA |
| 电源电压： | 2.7 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-WDFN 裸露焊盘 |
| 供应商设备封装： | 8-TDFN-EP（3x3） |
| 包装： | 标准包装 |
| 其它名称： | MAX1946ETA+TDKR |
Single USB Switch with Autoreset and
Fault Blanking in Tiny TDFN
IN
ON
SEL
IN
MAX1946
CHARGE
PUMP
ILIM
FAULT
THERMAL
SHUTDOWN
FAULT LOGIC
20ms TIMERS
OSC
25mA
OUT
UVLO
25kHz
BIAS
REF
GND
Figure 1. Functional Diagram
An internal micropower charge pump generates a high-
side supply that drives the gate of an internal 75m ?
Table 1. On/Off Control
NMOS switch.
On/Off Control and Undervoltage
Lockout (UVLO)
SEL sets the active polarity of the logic input of the
MAX1946. Connect ON to the same voltage as SEL to
enable OUT. Connect ON to the opposite voltage as
SEL
GND
V IN
ON
GND
V IN
GND
V IN
OUT BEHAVIOR
ON
OFF
OFF
ON
SEL to disable OUT (see Table 1). The output enters a
high-impedance state when disabled.
The MAX1946 includes a UVLO circuit to prevent erro-
neous switch operation when the input voltage goes
low during startup and brownout conditions. Input volt-
ages less than 2.5V inhibit operation of the device.
FAULT asserts low during a UVLO condition.
Output Fault Protection and Autoreset
The MAX1946 senses the switch output voltage and
selects continuous current limiting for V OUT greater
than 1V or short-circuit current limiting for V OUT less
than 1V. When V OUT is greater than 1V, the device
operates in a continuous current-limit mode that limits
output current to 1.1A. When V OUT is less than 1V, the
device operates in short-circuit current-limit mode,
sourcing 1.2A pulses to the load. When either fault con-
dition persists for 20ms, the output turns off and the
fault flag asserts. The output automatically restarts
20ms after the short or overload is removed.
The MAX1946 detects short-circuit removal by sourcing
25mA from the output and monitoring the output volt-
age. When the voltage at the output exceeds 0.5V for
20ms, the fault flag resets, the output turns back on,
and the 25mA current source turns off.
Thermal Shutdown
When the MAX1946 die temperature exceeds +160°C
the switch turns off and FAULT goes low. Thermal shut-
down does not utilize the 20ms fault-blanking timeout
period. When the junction temperature cools by 15°C
the switch turns on again and FAULT returns high.The
switch cycles on and off if the overload condition per-
sists, resulting in a pulsed output that reduces the aver-
age system load.
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1946EUA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1947ETA18 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1947ETA18+ | 制造商:Maxim Integrated Products 功能描述:CONV DC-DC SGL-OUT STEP UP 8TDFN EP - Rail/Tube |
| MAX1947ETA18+T | 功能描述:直流/直流开关转换器 Step-Up w/RESET 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 |
| MAX1947ETA18-T | 功能描述:直流/直流开关转换器 Step-Up w/RESET 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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