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MIC2506BM 参数 Datasheet PDF下载

MIC2506BM图片预览
型号: MIC2506BM
PDF下载: 下载PDF文件 查看货源
内容描述: 2A单/双1A /高侧开关 [Single 2A / Dual 1A / High-Side Switches]
分类和应用: 开关
文件页数/大小: 12 页 / 149 K
品牌: MICREL [ MICREL SEMICONDUCTOR ]
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MIC2505/2506  
Micrel  
Duplicate IN and OUT leads are not internally connected.  
Connect both IN pins to the supply. Connect both OUT leads  
to the load.  
Functional Description  
The MIC2505-series and MIC2506 are high-side N-Channel  
switches. The MIC2505, MIC2505-1, and MIC2506 have  
active-high enable inputs. The MIC2505-2 has an active-low  
input. Fault conditions inhibit output transistor turn-on or  
turnoff when enabled.  
Thermal Shutdown  
Thermal shutdown shuts off the output MOSFET and signals  
the fault flag if the die temperature exceeds 135°C. 10°C of  
hysteresis prevents the switch from turning on until the die  
temperature drops to 125°C.  
Control Input  
CTL (control input) activates the oscillator, thermal shut-  
down, UVLO, 1.2V reference, and gate control circuits. If  
there are no fault conditions, the output MOSFET turns on  
when enabled.  
Overtemperature detection functions only when the control  
input is enabled (output MOSFET is on). Both MIC2506  
outputs are shut off during overtemperature, and both flags  
will go low.  
Reference  
Undervoltage Lockout  
A1.2Vbandgapreferencesuppliesaregulatedvoltagetothe  
thermal shutdown and undervoltage lockout circuits. The  
reference is only active when CTL is enabled.  
UVLO (undervoltage lockout) prevents the output MOSFET  
from turning on until V (input voltage) exceeds 2.5V typical.  
IN  
After the switch turns on, if V drops below 2.3V typical,  
IN  
Oscillator/Charge Pump  
UVLO shuts off the output MOSFET and turns the fault flag  
The oscillator produces an 80kHz square wave output which  
drives the charge pump. The oscillator is enabled when CTL  
is active.  
on (active low) until V drops below 1.5V.  
IN  
Undervoltage detection functions only when the control input  
is enabled (output MOSFET is on).  
The charge pump is a voltage quintupler (5×). The charge  
pump capacitors are self contained.  
Overcurrent Limit  
The overcurrent limit is preset internally. The preset level  
prevents damage to the output MOSFET but allows a mini-  
mum current of 2A through the output MOSFET of the  
MIC2505-series and 1A for each output MOSFET of the  
MIC2506. Output current is monitored by sensing the voltage  
drop across the output MOSFET drain metal resistance.  
Gate Control  
The gate control circuit charges the output MOSFET gate  
from the charge pump output or discharges the MOSFET  
gate to ground as determined by CTL, thermal shutdown, or  
UVLO (undervoltage lockout).  
An optional, external capacitor may be connected to the  
MIC2505 GATE to lengthen the rise time. This slows the turn  
on of the MOSFET output switch. (See “MIC2505 Turn-On  
Delaygraph.)SincethispinconnectsdirectlytotheMOSFET  
gate, use ESD precautions when contacting components  
connected to this pin. Leakage resistance may increase turn-  
on times.  
Overcurrentdetectionfunctionsonlywhenthecontrolinputis  
enabled (output MOSFET is on) and V is above the UVLO  
IN  
threshold.  
Open-Load Detection  
Open-load detection is available only on the MIC2505 and  
MIC2506. The open-load detection feature is not included in  
the MIC2505-1 or -2 versions.  
Input and Output  
Open-load detection indicates the absence of an output load  
by activating the fault flag. Open-load detection is optional  
and is enabled by connecting a high-value pull-up resistor  
between IN and OUT. If there is no load, the circuit detects a  
highOUT(output)voltage(typically1V)andsignalsthefault  
flag. Under normal conditions, the low resistance of a typical  
loadpullsOUTlow. Open-loaddetectionfunctionsonlywhen  
the control input is low (output MOSFET is off).  
IN(input)isthesupplyconnectiontothelogiccircuitryandthe  
drainoftheoutputMOSFET.OUT(output)isthesourceofthe  
output MOSFET. In a typical circuit, current flows through the  
switch from IN to OUT toward the load.  
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  
> V ) when the output switch is  
OUT  
IN  
offandV >UVLOminimum. Inthissituation, theMIC2505/6  
IN  
Fault Flag  
avoids undesirable drain to body diode reverse current flow  
by grounding the body when the switch is off. (The conven-  
tional method for optimum turn-on threshold has the source  
connectedtothebody.Thiswouldallowalargecurrenttoflow  
FLG is an N-channel, open-drain MOSFET output. The fault-  
flag is active (low) for one or more of the following conditions:  
open load (except MIC2505-1 and -2 versions), undervolt-  
age, current limit, or thermal shutdown. The flag output  
MOSFET is capable of sinking a 10mA load to typically  
100mV above ground.  
when V  
> V  
+ 0.6V.)  
source  
drain  
MIC2505 Series Only  
MIC2505/2506  
8
April 1998