- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383605 > MIC2545A (Micrel Semiconductor,Inc.) Programmable Current Limit High-Side Switch(可編程 限流高邊開關(guān)) PDF資料下載
參數(shù)資料
| 型號(hào)： | MIC2545A |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | Programmable Current Limit High-Side Switch(可編程 限流高邊開關(guān)) |
| 中文描述： | 可編程電流限制高邊開關(guān)（可編程限流高邊開關(guān)） |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 124K |
| 代理商： | MIC2545A |
MIC2545A/2549A
Applications Information
Supply Filtering
A 0.1
μ
F to 1
μ
F bypass capacitor from IN to GND, located near
the MIC2545A and MIC2549A, is strongly recommended to
control supply transients. Without a bypass capacitor, an
output short may cause sufficient ringing on the input (from
supply lead inductance) to damage internal control circuitry.
Input transients must not exceed the absolute maximum
supply voltage (V
IN max
= 6V) even for a short duration.
Micrel
MIC2545A/2549A
12
June 2000
MIC2549A-1BM
EN
OUT
FLG
GND
OUT
ILIM
IN
IN
1
8
2
7
3
6
4
5
0.1μF to 1μF
4.0V to 5.5V
R
SET
Figure 3. Supply Bypassing
Power Dissipation
The device's junction temperature depends on several fac-
tors such as the load, PCB layout, ambient temperature and
package type. Equations that can be used to calculate power
dissipation and junction temperature are found below.
Calculation of power dissipation can be accomplished by the
following equation:
P
D
= R
DS(on)
×
(I
OUT
)2
To relate this to junction temperature, the following equation
can be used:
T
J
= P
D
×
θ
JA
+ T
A
where:
T
J
= junction temperature
T
A
= ambient temperature
θ
JA
= is the thermal resistance of the package
Transient Overcurrent Filter
The inrush current from the connection of a heavy capacitive
load may cause the fault flag to fall for 10
μ
s to 200
μ
s while the
switch is in a constant-current mode, charging the capaci-
tance.
Adding an optional series resistor-capacitor (R
SET2
) in paral-
lel with R
SET
, as shown in Figure 4, allows the transient
current-limit to be set to a different value than steady state. A
typical USB hot-plug inrush is 2A to 3A for 10
μ
s to 20
μ
s. If
R
SET
is 435
(530mA), an R
SET2
of 88
(2.5A) and C
SET
of
1
μ
F (RC
≈
90
μ
s) allows transient surge of 3A to pass for 90
μ
s
without tripping the overcurrent flag (FLG).
USB Power Distribution
The MIC2545A is ideal for meeting USB power distribution
requirements. Figure 7 depicts a USB Host application. R
SET
should be set to a value providing a current-limit >500mA.
The accurate current-limit of the MIC2545A will reduce power
supply current requirements. Also, fast reaction to short
circuit faults prevent voltage droop in mobile PC applications.
Printed Circuit Board Hot-Plug
The MIC2545A/49A is an ideal inrush current-limiter suitable
for hot-plug applications. Due to the integrated charge pump,
the MIC2545A/49A presents a high impedance when off and
slowly becomes a low impedance as it turns on. This
“
soft-
start
”
feature effectively isolates power supplies from highly
capacitive loads by reducing inrush current during hot-plug
events. Figure 5 shows how the MIC2545A may be used in
a hot-plug application.
ON/OFF
OVERCURRENT
MIC2545A-2
EN
FLG
GND
ILIM
3.3V USB Controller
V
BUS
D+
D
–
GND
10k
MIC5203-3.3
LDO Regulator
IN
OUT
GND
Ferrite
Bead
V
BUS
D+
D
–
GND
D+
D
–
V+
OUT
IN
OUT
IN
Bold
lines indicate
0.1" wide, 1-oz. copper
high-current traces.
Downstream
USB
Port 1
4.75V min.
500mA max.
120μF
0.01μF
1.0
μF
GND
0.1μF
5V
(+)
(
–
)
4.7μF
R
SET
R
SET(2)
(optional)
C
SET
1.5k
2%
0.1μF
Figure 4. USB Host Application
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2557 | PCMCIA Card Socket VPP Switching Matrix |
| MIC2557BM | Replaced by PT6501 : |
| MIC2557BMT&R | PCMCIA Card Socket VPP Switching Matrix |
| MIC2558 | PCMCIA Dual Card Socket VPP Switching Matrix |
| MIC2559 | Replaced by PT6502 : |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2545A-1BM | 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 |
| MIC2545A-1BM 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 |
| MIC2545A-1BMTR | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| MIC2545A-1BN | 功能描述:IC SW CURR LIMIT HI SIDE 8-DIP 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 |
| MIC2545A-1BTS | 功能描述:IC SW CURR LIMIT HI SIDE 14TSSOP 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。