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| 型号： | MAX16946GEE/V+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 17/21页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO/SWITCH ADJ 16QSOP |
| 其它有关文件： | Automotive Product Guide |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 汽车系统，远程电源 |
| 电流 - 电源： | 2.1mA |
| 电源电压： | 4.5 V ~ 18 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-LSSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-QSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
MAX16946/MAX16947
Remote Antenna, Current-Sense and
LDO/Switches
? V OUT ?
Current-Limit Threshold Selection
A resistive divider between REF, LIM, and GND sets the
current-limit threshold. See Figure 6.
Use the following formula to set the desired current-limit
R 2 =
R 1
? V FB ?
? ? 1 ?
V REF
? R SENSE × I CL × A V + 0.4V
? 1 ?
threshold:
R 2 =
?
?
R 1
?
?
Select R 1 so that the maximum input bias current at FB
is negligible compared to the total current going through
R 1 .
R 2 =
? 0.5 ? × 0.120A × 26V/V+0.4V ? 1 ?
where I CL is the desired current-limit threshold, A V is the
current-sense amplifier gain (26V/V typ), and V REF is the
reference voltage (3V typ). Size R 1 and R 2 large enough
so that the equivalent resistance of the resistive dividers
used to set the open-load and current-limit thresholds
does not exceed the REF output 100 F A drive capability.
For example, to set the current-limit threshold at 120mA,
using a 0.5 I sense resistor, use the following method to
calculate the value of R 1 and R 2 :
R 1
? 3V ?
? ?
Choose R 1 = 83k I and calculate R 2 as 156k I .
Using an External Reference
Use an external reference with resistive dividers as an
alternative means of setting the current-limit and open-
load current thresholds. The equations shown in the
Open-Load Current Threshold Selection and Current-
Limit Threshold Selection sections are still applicable
when using an external reference. In those equations,
set V REF equal to the voltage of the external reference.
When using the devices’ 3V reference, the maximum
voltage at LIM is V LIM = 3V and is obtained by connect-
ing LIM to REF. When using an external reference, set
the voltage at LIM to no greater than V LIM(MAX) = 3.65V.
Fixed/Adjustable Output Voltage
The MAX16946 is configurable to provide a fixed 8.5V
output or as an adjustable LDO with an output between
Compensation Capacitor
Compensate the LDO regulator by bypassing COMP to
GND with a 0.1 F F ceramic capacitor.
Input Capacitor
Connect a low-leakage ceramic capacitor from IN to
GND to limit the input-voltage drop during momentary
output short-circuit conditions and to protect the device
against transients due to inductance in the IN line. For
example, use at least a 0.1 F F ceramic capacitor if the
input inductance (including any stray inductance) is
estimated to be 20 F H. Larger capacitor values reduce
the voltage undershoot and voltage overshoot in case of
reverse current at the input.
Output Capacitor
In an analogous fashion to the input capacitor, an output
capacitor protects the device against transients due to
any series inductance in the output. Under no conditions
should the voltage on OUT go below -0.3V as specified
in the Absolute Maximum Ratings section. A Schottky
diode is required to clamp transients that go below
ground. For example, with a 2.2mH series inductance,
to avoid excessive ringing at the output, bypass OUT to
GND with not more than 0.1 F F capacitance. Additionally,
bypassing OUT to GND with a 2.2 F F ceramic capacitor
in series with a 10 I resistor reduces ringing caused by
load current transients through a maximum 2.2mH series
inductance.
OUT
3.3V and 15V. Connect a resistive divider between OUT,
FB, and GND to set the output to the desired voltage, as
shown in Figure 7. Connect FB to REG to configure the
MAX16946 as an 8.5V LDO, as shown in Figure 8. FB is
regulated to 1.0V with Q 3% accuracy for a load current
between 5mA and 150mA. The accuracy falls to Q 5% for
a load current between 2mA and 200mA. Select a value
MAX16946
FB
R 1
R 2
for R 1 and calculate R 2 as follows:
Maxim Integrated
Figure 7. Adjustable Output-Voltage Selection
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16946GTE/V+ | 功能描述:电源开关 IC - 配电 Remote Antenna Current-Sense RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MAX16946GTE/V+T | 功能描述:电源开关 IC - 配电 Remote Antenna Current-Sense RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MAX16946GUE/V+ | 功能描述:电源开关 IC - 配电 Remote Antenna Current-Sense RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MAX16946GUE/V+T | 功能描述:电源开关 IC - 配电 Remote Antenna Current-Sense RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
| MAX16947GEE/V+ | 功能描述:电源开关 IC - 配电 Remote Antenna Current-Sense RoHS:否 制造商:Exar 输出端数量:1 开启电阻（最大值）:85 mOhms 开启时间（最大值）:400 us 关闭时间（最大值）:20 us 工作电源电压:3.2 V to 6.5 V 电源电流（最大值）: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-5 |
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