- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383605 > MIC2544-2BM (MICREL INC) Programmable Current Limit High-Side Switch Preliminary Information PDF資料下載
參數(shù)資料
| 型號： | MIC2544-2BM |
| 廠商： | MICREL INC |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | Programmable Current Limit High-Side Switch Preliminary Information |
| 中文描述： | 0.1 A BUF OR INV BASED PRPHL DRVR, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 470K |
| 代理商： | MIC2544-2BM |
June 2000
9
MIC2544/2548
MIC2544/2548
Block Diagram
Micrel
Functional Description
The MIC2544 and MIC2548 are 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
IN is the power supply connection to the logic circuitry and the
drain of the output MOSFET. OUT is the source of the output
MOSFET. In a typical circuit, current flows from IN to OUT
toward the load. If V
OUT
is greater than V
IN
, current will flow
from OUT to IN since the switch is bidirectional when en-
abled. 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 MIC2544/48 avoids
undesirable current flow from OUT to IN. Both OUT pins 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 MIC2548 features an internal latch which causes the part
to remain off after thermal shutdown until a reset pulse is
provided via the enable pin (pin 1). 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
EN 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. EN should not be allowed to go
negative with respect to GND, and V
EN
should be less than
or equal to V
IN
.
Adjustable Current-Limit
The short-circuit current-limit is user-adjustable with an exter-
nal 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 ILIM and GND. For a desired current-limit, the value
of the external set resistor is given by:
R
=
I
SET
LIMIT
230V
where:
154
< R
SET
< 2.29k
For example, to set a 1A nominal current-limit, R
SET
is
calculated as:
230V
1A
230
Current through R
SET
increases with OUT current. The
voltage across R
SET
could be monitored with a high imped-
ance comparator to provide an indication of output current.
R
SET
should be between 154
±
0.5% and 2.29k
±
0.5%.
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
FLG 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.
1.2V
REFERENCE
THERMAL
SHUTDOWN
OSC.
CHARGE
PUMP
OUT
GATE
CONTROL
IN
FLG
EN
CURRENT
LIMIT
GND
ILIM
R
SET
THERMAL
SHUTDOWN
LATCH
(MIC2548)
RESET
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2544-2BMM | Programmable Current Limit High-Side Switch Preliminary Information |
| MIC2548-1BM | Programmable Current Limit High-Side Switch Preliminary Information |
| MIC2548-1BMM | Replaced by PT6522 : |
| MIC2548-2BM | Replaced by PT6522 : |
| MIC2549A | Programmable Current Limit High-Side Switch(可編程 限流高邊開關(guān)) |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2544-2BM TR | 功能描述:IC SW CURR LIMIT HI SIDE 8-SOP RoHS:否 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅(qū)動(dòng)器 - 內(nèi)部開關(guān) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:高端 輸入類型:非反相 輸出數(shù):1 導(dǎo)通狀態(tài)電阻:85 毫歐 電流 - 輸出 / 通道:2A 電流 - 峰值輸出:6A 電源電壓:1.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:4-UFDFN 裸露焊盤，4-TMLF? 供應(yīng)商設(shè)備封裝:4-TMLF?（1.2x1.6） 包裝:剪切帶 (CT) 其它名稱:576-1574-1 |
| MIC2544-2BMM | 功能描述:IC SW CURR LIMIT HI SIDE 8-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅(qū)動(dòng)器 - 內(nèi)部開關(guān) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:高端 輸入類型:非反相 輸出數(shù):1 導(dǎo)通狀態(tài)電阻:85 毫歐 電流 - 輸出 / 通道:2A 電流 - 峰值輸出:6A 電源電壓:1.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:4-UFDFN 裸露焊盤，4-TMLF? 供應(yīng)商設(shè)備封裝:4-TMLF?（1.2x1.6） 包裝:剪切帶 (CT) 其它名稱:576-1574-1 |
| MIC2544-2BMM TR | 功能描述:IC SW CURR LIMIT HI SIDE 8-MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅(qū)動(dòng)器 - 內(nèi)部開關(guān) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:高端 輸入類型:非反相 輸出數(shù):1 導(dǎo)通狀態(tài)電阻:85 毫歐 電流 - 輸出 / 通道:2A 電流 - 峰值輸出:6A 電源電壓:1.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:4-UFDFN 裸露焊盤，4-TMLF? 供應(yīng)商設(shè)備封裝:4-TMLF?（1.2x1.6） 包裝:剪切帶 (CT) 其它名稱:576-1574-1 |
| MIC2544-2YM | 功能描述:電源開關(guān) IC - USB Programmable Current Limit Single High-Side Switch - Lead Free RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
| MIC2544-2YM TR | 功能描述:電源開關(guān) IC - USB Programmable Current Limit Single High-Side Switch - Lead Free RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。