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參數(shù)資料
| 型號： | MIC2548-2BM |
| 廠商： | MICREL INC |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | Replaced by PT6522 : |
| 中文描述： | 0.1 A BUF OR INV BASED PRPHL DRVR, PDSO8 |
| 封裝： | SOP-8 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大?。?/td> | 470K |
| 代理商： | MIC2548-2BM |
MIC2544/2548
Applications Information
Supply Filtering
A 0.1
μ
F to 1
μ
F bypass capacitor from IN to GND, located near
the MIC2544 and MIC2548, 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
MIC2544/2548
10
June 2000
MIC2548-1BM
EN
OUT
FLG
GND
OUT
ILIM
NC
IN
1
8
2
7
3
6
4
5
0.1μF to 1μF
4.0V to 5.5V
R
SET
NOTE: MSOP PACKAGE OPTION USES PIN 5 FOR I
LIM
.
PIN 4 IS NOT CONNECTED (NC).
On/Off
Power
Output
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
(510mA), an R
SET2
of 88
(2.5A) and C
SET
of
1
μ
F (RC = 100
μ
s) allows transient surge of 3A to pass for
100
μ
s without tripping the overcurrent flag (FLG).
USB Power Distribution
The MIC2544 is ideal for meeting USB power distribution
requirements. Figure 4 depicts a USB Host application. R
SET
should be set to a value providing a current-limit >500mA.
The accurate current-limit of the MIC2544 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 MIC2544/48 are ideal inrush current-limiters suitable for
hot-plug applications. Due to the integrated charge pump,
the MIC2544/48 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 MIC2544 may be used in a
hot-plug application.
ON/OFF
OVERCURRENT
MIC2544-2BM
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
NC
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
NOTE: MSOP PACKAGE OPTION USES PIN 5 FOR I
LIM
.
PIN 4 IS NOT CONNECTED (NC).
R
SET
100k
R
SET(2)
(optional)
C
SET
1.5k 2%
Figure 4. USB Host Application
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MIC2549A | Programmable Current Limit High-Side Switch(可編程 限流高邊開關(guān)) |
| MIC2545A | Programmable Current Limit High-Side Switch(可編程 限流高邊開關(guān)) |
| MIC2557 | PCMCIA Card Socket VPP Switching Matrix |
| MIC2557BM | Replaced by PT6501 : |
| MIC2557BMT&R | PCMCIA Card Socket VPP Switching Matrix |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2548-2BM 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 |
| MIC2548-2BMM | 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 |
| MIC2548-2BMM 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 |
| MIC2548-2YM | 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 |
| MIC2548-2YM 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 |
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