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| 型号： | MIC2505-1YM |
| 厂商： | Micrel Inc |
| 文件页数： | 9/12页 |
| 文件大小： | 0K |
| 描述： | IC SW HIGH SIDE SGL 2A 8SOIC |
| 标准包装： | 95 |
| 类型： | 高端 |
| 输入类型： | 非反相 |
| 输出数： | 1 |
| 导通状态电阻： | 30 毫欧 |
| 电流 - 输出 / 通道： | 2A |
| 电流 - 峰值输出： | 4A |
| 电源电压： | 2.7 V ~ 7.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
| 产品目录页面： | 1084 (CN2011-ZH PDF) |
| 其它名称： | 576-1081 |
MIC2505/2506
Applications Information
Supply Filtering
A 0.1 μ F to 1 μ F bypass capacitor from IN to GND, located at
the device is strongly recommended to control supply tran-
sients. Without a bypass capacitor, an output short may
cause sufficient ringing on the input (from supply lead induc-
tance) to destroy the internal control circuitry.
Input transients must not exceed the absolute maximum
Micrel
U2 is off, this feature prevents current flow from the load (5V)
backward through U2 to the 3.3V supply. (If a discrete
MOSFET and driver were used, the MOSFET ’ s internal body
diode would short the 5V load to the 3.3V supply.)
FLG will be active (low) on any switch that is off whenever the
load voltage is greater than the open load threshold (approxi-
mately 1V) except for MIC2505-1 and MIC2505-2.
+5V +3.3V
Logic-High = 5V Output
Logic-Low = 3.3V Output
supply voltage (V IN max = 7.5V) even for a short duration.
U1
U2
2.7V to 7.5V
1N4148
(optional)
1
MIC2505BM
CTL OUT
8
1
MIC2505BM
CTL OUT
8
ON
OFF
1
2
MIC2505BM
CTL OUT
FLG IN
8
7
2
3
FLG
GND
IN
OUT
7
6
2
3
FLG
GND
IN
OUT
7
6
3
GND
OUT
6
0.1μF to 1μF
4
GATE
IN
5
0.1μF
4
GATE
IN
5
0.1μF
4
GATE
IN
5
Figure 1. Supply Bypassing
The bypass capacitor may be omitted only if board design
precautions are followed, such as using extremely short
supply leads or power and ground planes.
Control Input
CTL 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. Add a diode clamp if negative spikes
may occur. See Figure 2.
Open-Load Detection
Refer to “ Typical Applications ” (first page). Open-load detec-
tion is available only on the MIC2505 and MIC2506. For USB
power distribution applications, the open-load detection fea-
ture is not included in the MIC2505-1 or -2 versions.
Figure 2. 5V/3.3V Switch Concept
This circuit ’ s function would otherwise require a dual driver,
two MOSFETs, plus two diodes (or a dual driver plus four
MOSFETs).
Hot Plug-In Applications (Soft-Start)
The MIC2505/6 family can be used to protect the socket-side
and card-side of a supply circuit from transients caused when
a capacitive load is connected to an active supply.
The switch presents a high impedance when off, and slowly
becomes a low impedance as it turns on. This reduces the
inrush current and related voltage drop that result from
charging a capacitive load.
The optional open-load detection resistor supplies a small
pull-up current to the load when the output switch is off. (A
100k resistor will draw 50 μ A from a 5V supply.) Normally, the
load dominates, pulling OUT low. If the load is absent, the
optional resistor pulls OUT high, activating the fault flag if CTL
is off.
3.3V
1
2
3
MIC2505BM
CTL OUT
FLG IN
GND OUT
8
7
6
Power Control
Circuitry
Capacitive
Load
When a load is switched off with CTL, capacitance on the
4
GATE
IN
5
0.1μF
output may cause the open-load function to pull the flag low
until the capacitor is discharged below approximately 2.4V.
Omit the pull-up resistor when open load detection is not
GND
Socket
Card
required and for minimum off-state supply current.
Power Bus Switch
The MIC2505/6 family features a MOSFET reverse current
flow prevention circuit. This prevents current from flowing
backwards (from OUT to IN) when CTL is disabled as long as
V IN is above UVLO minimum. In Figure 2, when U1 is on and
Figure 3. Hot Plug-In Concept
A gate capacitor may be added to the MIC2505 to slow the
turn on time even more, reducing the inrush current. See
“ MIC2505 Turn-On Delay ” graph. The UVLO feature insures
that each time the card is removed and V IN = 0 that the gate
of the output switch is discharged to zero volts. A controlled
turn-on is executed each time a board is plugged in, even with
multiple insertions.
April 2004
9
M9999-042704
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| MIC2505-1YM TR | 功能描述:电源开关 IC - USB Fully Integrated High-Side Switch (Single 2Amp) - Lead Free RoHS:否 制造商:Micrel 电源电压-最小:2.7 V 电源电压-最大:5.5 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:SOIC-8 封装:Tube |
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