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参数资料
| 型号： | MAX16948AGTE/V+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC LDO/SWITCH ADJ DUAL 16TQFN |
| 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 ~ 28 V |
| 工作温度： | -40°C ~ 105°C |
| 安装类型： | * |
| 封装/外壳： | * |
| 供应商设备封装： | * |
| 包装： | * |
MAX16948
Automotive Dual Remote Antenna
Current-Sense LDO/Switch
Fault Detection
The device monitors the load current through an internal
sense resistor to protect against short-circuit, short-to-
battery, and reverse current faults. In addition, the device
also detects input and output overvoltage conditions and
features thermal shutdown.
Short Circuit and Overcurrent
The current limit of each channel is programmed with
an external resistor connected to the output of the cur-
rent sense amplifiers LIM_ to protect the device during
short-circuit or overcurrent conditions. When the voltage
at LIM_ reaches the internal 2.5V threshold, the output
current of the LDO/switch is limited, and ERR_ asserts
low but the output is not disabled. The ERR_ and LIM_
outputs should be monitored by the F C, and the channel
experiencing the short-circuit or overcurrent condition
should be disabled by pulling SHDN_ low. If this condi-
tion persists, thermal shutdown could occur and both
outputs could be disabled.
Short-to-Battery and Reverse Current Detection
It is possible for OUT_ to be shorted to the battery due
to a fault in the system. Each channel detects this failure
by comparing the voltage at OUT_ and IN before the
switch turns on. Every time the LDO/switch is enabled on
the rising edge of SHDN_ or during the exiting of thermal
shutdown, the short-to-battery detection is performed. At
this point, if the device detects the short-to-battery fault,
the LDO/switch stays off and ERR_ is asserted low. The
fault is latched, and the startup resumes when the short-
to-battery fault is removed and SHDN_ is toggled.
During normal operation if a short-to-battery fault results
in reverse current for more than 5 F s (typ) the LDO/switch
is latched off and ERR_ is asserted low. To remove the
Table 1. Fault Response
latched condition after a short-to-battery (reverse current)
fault, the fault condition must first be removed and SHDN_
must be toggled.
Series inductance and the output capacitor can produce
ringing during large load transients when enabling the
LDO/switch, resulting in an output voltage that temporarily
exceeds the input voltage. Blanking is implemented during
startup. The reverse current blanking time (t REV_BLANK ) is
16ms (typ).
When the MAX16948 is operated with input voltage close
to the output voltage, as in switch mode operation or LDO
mode in dropout, care must be taken to avoid a false
reverse current detection in the presence of a short circuit
to ground fault. If both channels are enabled and one chan-
nel is shorted to ground after startup, the current drawn
from C IN may result in a temporary dip in the intput voltage,
which may trigger the reverse current detection fault. To
aovoid this false trigger event, use an electrolytic capacitor
of at least 100 F F.
Thermal Shutdown
Thermal shutdown circuitry protects the device from
overheating. The switch turns off immediately when the
junction temperature exceeds +160 N C (typ). The switch
turns on again after the device temperature drops by
approximately 15 N C (typ).
FB Inputs (FB1/FB2)
FB1 and FB2 control the output voltage on OUT1 and
OUT2. Connect FB_ to GND to select current-limited
switch operation. Connect to an external resistive divider
for adjustable output voltage operation (feedback volt-
age 1V (typ)). Connect FB_ to REG to choose the internal
resistive divider for the 8.5V regulator option.
DEVICE STATUS
Normal Operation
Short Circuit to GND or
Overcurrent
V OUT > V IN at Startup
Reverse Current
V FB > 1.2V
Input Overvoltage
Thermal Shutdown
V LIM_ (V)
0 P V LIM_ < 2.5
2.5
0
0
0
0
0
V ERR
High
Low
Low
Low
High
Low
High
LDO/SW OUTPUT
Enabled
Enabled
Disabled
Disabled
Enabled
Disabled
Disabled
LATCHED
No
No
Yes
Yes
No
No
No
Maxim Integrated
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX16948BGEE/V+ | 制造商:Maxim Integrated Products 功能描述:AUTOMOTIVE DUAL REMOTE ANTENNA CURRENT-SENSE LDO/SWITCH - Rail/Tube |
| MAX16948BGEE/V+T | 制造商:Maxim Integrated Products 功能描述:AUTOMOTIVE DUAL REMOTE ANTENNA CURRENT-SENSE LDO/SWITCH - Tape and Reel |
| MAX1694EUB | 功能描述:电源开关 IC - USB USB Current-Limited Switch w/Fault Blank RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1694EUB+ | 功能描述:电源开关 IC - USB USB Current-Limited Switch w/Fault Blank RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
| MAX1694EUB+T | 功能描述:电源开关 IC - USB USB Current-Limited Switch w/Fault Blank RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
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