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參數資料
| 型號： | MIC2547-1BTS |
| 廠商： | MICREL INC |
| 元件分類： | 外設及接口 |
| 英文描述： | Dual Programmable Current Limit Switch Preliminary Information |
| 中文描述： | 0.1 A 2 CHANNEL, BUF OR INV BASED PRPHL DRVR, PDSO16 |
| 封裝： | TSSOP-16 |
| 文件頁數： | 11/12頁 |
| 文件大?。?/td> | 262K |
| 代理商： | MIC2547-1BTS |
June 2000
11
MIC2546/2547
MIC2546/2547
Applications Information
Supply Filtering
A 0.1
μ
F to 1
μ
F bypass capacitor from INX to GND, located
near the MIC2546 and MIC2547, 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
MIC2546-1BM
INA
OUTA
OUTA
ENA
GNDA
NC
FLGB
ILIMA
1
16
2
15
3
14
4
13
4.0V to 5.5V
.
FLGA
GNDB
ILIMB
OUTB
R
SETB
ENB
OUTB
NC
INB
5
6
7
8
12
11
10
9
R
SETA
0.1 to 1
μ
F
0.1 to 1
μ
F
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 3, 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 MIC2546 is ideal for meeting USB power distribution
requirements. Figure 3 depicts a USB Host application. R
SET
should be set to a value providing a current-limit >500mA.
The accurate current-limit of the MIC2546 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 MIC2546/47 are ideal inrush current-limiters suitable for
hot-plug applications. Due to the integrated charge pump,
the MIC2546/47 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.
R
SET
ON/OFF
OVERCURRENT
MIC2546-2BM
3.3V USB Controller
V
BUS
D+
D
–
GND
10k
MIC5203-3.3
LDO Regulator
IN
OUT
GND
Ferrite Bead
D+
D
–
GND
D+
D
–
V+
INA
OUTA
ENA
NC
FLGA
GNDB
ILIMB
OUTB
OUTA
ILIMA
GNDA
FLGB
ENB
OUTB
NC
INB
Bold
lines indicate
0.1" wide, 1-oz. copper
high-current traces.
Downstream
USB
Port 1
4.75V min.
500mA max.
120
μ
F
0.01
μ
F
GND
5V
(+)
(
–
)
4.7
μ
F
(optional)
1.5k 2%
R
SET
10k
V
BUS
V
BUS
D+
D
–
GND
Downstream
USB
Port 2
4.75V min.
500mA max.
120
μ
F
0.01
μ
F
Ferrite Bead
100k
R
SET(2)
C
SET
100k
Figure 3. USB Host Application
相關PDF資料 |
PDF描述 |
|---|---|
| MIC2547-2BM | Replaced by PT6522 : |
| MIC2547-2BTS | Dual Programmable Current Limit Switch Preliminary Information |
| MIC2550ABML | Circular Connector; MIL SPEC:MIL-C-5015; Body Material:Metal; Series:GTS; No. of Contacts:16; Connector Shell Size:24; Connecting Termination:Solder; Circular Shell Style:Straight Plug; Body Style:Straight |
| MIC2550AYML | ER 3C 3#16 PIN PLUG |
| MIC2550 | Replaced by PT6522 : |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MIC2547-1BTS TR | 功能描述:IC SW CURR LIMIT DUAL 16-TSSOP RoHS:否 類別:集成電路 (IC) >> PMIC - MOSFET，電橋驅動器 - 內部開關 系列:- 標準包裝:1 系列:- 類型:高端 輸入類型:非反相 輸出數:1 導通狀態(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? 供應商設備封裝:4-TMLF?（1.2x1.6） 包裝:剪切帶 (CT) 其它名稱:576-1574-1 |
| MIC2547-1YM | 功能描述:電源開關 IC - USB Dual 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 |
| MIC2547-1YM TR | 功能描述:電源開關 IC - USB Dual 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 |
| MIC2547-1YTS | 功能描述:電源開關 IC - USB Dual 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 |
| MIC2547-1YTS TR | 功能描述:電源開關 IC - USB Dual 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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