参数资料
| 型号： | MAX893LESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/8页 |
| 文件大小： | 0K |
| 描述： | IC SW P-CH HS 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 高端 |
| 输入类型： | 非反相 |
| 输出数： | 1 |
| 导通状态电阻： | 70 毫欧 |
| 电流 - 输出 / 通道： | 1.2A |
| 电流 - 峰值输出： | 1.8A |
| 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-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
1.2A, Current-Limited, High-Side
P-Channel Switch with Thermal Shutdown
INPUT VOLTAGE
+5V
IN
OUT
V OUT
MAX893L
SET
100k
MAX893L
R SET
BLANKED
R
100k
ON/OFF
GND
GND
SIGNAL
TO μP
C
0.1 μ F
FAULT
SET
R SET
Figure 2. Setting the Current Limit
Thermal Shutdown
The MAX893L features thermal shutdown. The switch
turns off when the junction temperature exceeds
+165°C. Once the device cools by 10°C, the switch
turns back on. If the fault condition is not removed, the
switch will cycle on and off, resulting in a pulsed out-
put.
Fault Indicator
The MAX893L provides a fault output ( FAULT ). This
open-drain output goes low when in current limit or
when the die temperature exceeds +165°C. A 100k ?
pull-up resistor from FAULT to IN provides a logic-
control signal.
Fault Blanking
During start-up in USB applications, the MAX893L
charges the relatively large USB capacitance. This may
activate an unwanted fault signal if the charging current
exceeds the programmed current limit. To “blank out”
this start-up fault signal, add a simple lowpass RC
delay circuit as shown in Figure 3. This circuit provides
a 10ms delay.
Applications Information
Input Capacitor
To limit the input voltage drop during momentary output
short-circuit conditions, connect a capacitor no more
than 5mm from IN to GND. A 1μF ceramic capacitor will
Figure 3. Fault-Blanking Circuit
Output Capacitor
Connect a 0.1μF capacitor from OUT to GND to prevent
inductive parasitics from pulling OUT negative during
turn-off.
Layout and Thermal-Dissipation
Considerations
To take full advantage of the switch-response time to
output short-circuit conditions, it is very important to
keep all traces as short as possible to reduce the effect
of undesirable parasitic inductance. Place input and
output capacitors as close to the device as possible
(no more than 5mm).
Under normal operating conditions, the package can
dissipate and channel heat away. Calculate the maxi-
mum power as follows:
P = (I LIMIT) 2 · R ON
where R ON is the on-resistance of the switch.
When the output is short circuited, the voltage drop
across the switch equals the input supply. Hence, the
power dissipated across the switch increases, as does
the die temperature. If the fault condition is not
removed, the thermal-shutdown protection circuitry
turns the switch off until the die temperature falls by
10°C. A ground plane in contact with the device will
help dissipate additional heat.
be adequate for most applications; however, higher
capacitor values will further reduce the voltage drop at
the input.
TRANSISTOR COUNT: 340
Chip Information
_______________________________________________________________________________________
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX893LESA-TG068 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX893LESA-TG075 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX8940EXK28+ | 制造商:Maxim Integrated Products 功能描述:LOW-NOISE, HIGH PSRR, LOW-DROPOUT, 120MA LINEAR REGULATOR - Rail/Tube |
| MAX8940EXK28+T | 功能描述:线性稳压器 - 标准 PSRR 120mA Linear Regulator RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MAX8940EXK30+T | 功能描述:线性稳压器 - 标准 PSRR 120mA Linear Regulator RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
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