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| 型号： | MIC2547-2YTS |
| 厂商： | Micrel Inc |
| 文件页数： | 12/15页 |
| 文件大小： | 0K |
| 描述： | IC SW CURR LIMIT DUAL 16-TSSOP |
| 标准包装： | 94 |
| 类型： | 高端 |
| 输入类型： | 非反相 |
| 输出数： | 2 |
| 导通状态电阻： | 80 毫欧 |
| 电流 - 峰值输出： | 1.5A |
| 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： | 16-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 16-TSSOP |
| 包装： | 管件 |
| 产品目录页面： | 1084 (CN2011-ZH PDF) |
| 其它名称： | 576-2176 MIC2547-2YTS-ND |
R SETX = ? ?
? ?
? = 230 ?
?
Micrel, Inc.
Functional Description
The MIC2546 and MIC2547 are dual high-side N-
channel switches available with active-high or active-low
enable inputs. Fault conditions turn off or inhibit turn-on
of the output transistor and activate the open-drain error
flag transistor making it sink current to ground.
Input and Output
INX is the power supply connection to the logic circuitry
and the drain of the output MOSFET. OUTX is the
source of the output MOSFET. In a typical circuit, current
flows from INX to OUTX toward the load. If VOUT is
greater than V IN , current will flow from OUTX to INX
since the switch is bidirectional when enabled. The
output MOSFET and driver circuitry are also designed to
allow the MOSFET source to be externally forced to a
higher voltage than the drain (V OUT > V IN ) when the
switch is disabled. In this situation, the MIC2546/47
avoids undesirable current flow from OUTX to INX. Both
OUT pins for a given channel must be connected
together.
Thermal Shutdown
Thermal shutdown shuts off the output MOSFET and
signals the fault flag if the die temperature exceeds
140 ° C. 10 ° C of hysteresis prevents the switch from
turning on until the die temperature drops to 130 ° C.
Overtemperature detection functions only when the
switch is enabled.
The MIC2547 features an internal latch which causes
the part to remain off after thermal shutdown until a reset
pulse is provided via the enable pin. While in current-
limit, the thermal shutdown latch prevents on/off cycling
of the output. Refer to Figure 2 for timing diagram. The
flag remains low until reset.
Enable Input
ENX must be driven logic high or logic low, or be pulled
high or low for a clearly defined input. Floating the input
may cause unpredictable operation. ENX should not be
allowed to go negative with respect to GND, and V ENX
should be less than or equal to V INX .
MIC2546/2547
Adjustable Current-Limit
The short-circuit current-limit is user-adjustable with an
external set resistor. Current-limit in the range of 100mA
to 1.5A is available with a set point accuracy of better
than ± 20%. The current-limit circuit prevents damage to
the output MOSFET and external load.
The nominal current-limit value is set with an external
resistor between ILIMX and GND. For a desired current-
limit, the value of the external set resistor is given by:
? 230V ?
? I LIMITX ?
where:
154 ? < R SET < 2.29k ?
For example, to set a 1A nominal current-limit, R SET is
calculated as:
? 230V ?
? 1A ?
Current through R SETX increases with OUT current. The
voltage across R SETX could be monitored with a high
impedance comparator to provide an indication of output
current. R SETX should be between 154 ? and 2.29k ?
(0.5% resistor value).
Short-Circuit Protection
In the event of a short-circuit, the output current will fold
back to approximately 80% of the short-circuit current-
limit.
Fault Flag
FLGX is an N-channel, open-drain MOSFET output. The
fault-flag is active (low) for current-limit or thermal
shutdown conditions. The flag output MOSFET is
capable of sinking a 10mA load to typically 100mV
above ground.
January 2008
12
M9999-012508-A
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| MIC2548-1BMM | 功能描述:IC SW CURR LIMIT HI SIDE 8-MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - MOSFET，电桥驱动器 - 内部开关 系列:- 标准包装:1 系列:- 类型:高端 输入类型:非反相 输出数:1 导通状态电阻:85 毫欧 电流 - 输出 / 通道:2A 电流 - 峰值输出:6A 电源电压:1.7 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:4-UFDFN 裸露焊盘，4-TMLF? 供应商设备封装:4-TMLF?（1.2x1.6） 包装:剪切带 (CT) 其它名称:576-1574-1 |
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