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參數資料
| 型號： | MIC2007 |
| 廠商： | Micrel Semiconductor,Inc. |
| 元件分類： | 熱切換/電源分布 |
| 英文描述： | Adjustable Current Limit Power Distribution Switch |
| 中文描述： | 可調的限流配電開關 |
| 文件頁數： | 3/17頁 |
| 文件大?。?/td> | 748K |
| 代理商： | MIC2007 |
Micrel
MIC2007/MIC2017
October 2005
11
M9999-102805
Functional Description
Input and Output
VIN is both the power supply connection for the internal
circuitry driving the switch and the input (Source
connection) of the power MOSFET switch. VOUT is the
Drain connection of the power MOSFET and supplies
power to the load. In a typical circuit, current flows from
VIN to VOUT toward the load. Since the switch is bi-
directional when enabled, if VOUT is greater than VIN,
current will flow from VOUT to VIN.
When the switch is disabled, current will not flow to the
load, except for a small unavoidable leakage current of
a few microamps. However, should VOUT exceed VIN by
more than a diode drop (~0.6V), while the switch is
disabled, current will flow from output to input via the
power MOSFET’s body diode. While this effect can be
used to advantage when large bypass capacitors are
placed on MIC2007/2017’s’s output, it can not be relied
upon to fully or reliably discharge the load capacitance,
because discharging depends upon the characteristics
of the circuitry at VIN.
To ensure proper discharge of any output capacitance,
MIC2007/2017 is equipped with a discharge FET which
is ON any time the device is not Enabled.
Current Sensing and Limiting
The MIC2007/2017 protects the system power supply
and load from damage by continuously monitoring
current through the on-chip power MOSFET. Load
current is monitored, by means of a current mirror, in
parallel with the power MOSFET switch. Current limiting
is invoked when the load exceeds an externally set
over-current threshold. When current limiting is activated
the output current is constrained to the limit value, and
remains at this level until either the load/fault is
removed, the load’s current requirement drops below
the limiting value, or the MIC2007/2017 goes into
thermal shutdown.
Kickstart (MIC2017 only)
The MIC2017 is designed to allow momentary current
surges (Kickstart) before the onset of current limiting,
which permits dynamic loads, such as small disk drives
or portable printers to draw the energy needed to
overcome inertial loads without sacrificing system
safety. In this respect, the MIC2017 differs markedly
from MIC2007 and its peers, which immediately limit
load current, potentially starving the motor and causing
the appliance to stall or stutter.
During this delay period, typically 128 ms, a secondary
current limit is in effect. If the load demands a current in
excess of the secondary limit, the MIC2017 acts
immediately to restrict output current to the secondary
limit for the duration of the Kickstart period. After this
time, the MIC2017 reverts to its normal current limit. An
example of Kickstart operation is shown below.
T
U
O
T
U
O
Figure 3. Kickstart Operation
Picture Key:
A) MIC2017 is enabled into an excessive load (slew
rate limiting not visible at this time scale) The initial
current surge is limited by either the overall circuit
resistance and power supply compliance, or the
secondary current limit, whichever is less.
B) RON of the power FET increases due to internal
heating (effect exaggerated for emphasis).
C) Kickstart period.
D) Current limiting initiated. FAULT/ goes LOW. (Note:
MIC2007/2017 does not provide a FAULT/ output.)
E) VOUT is non-zero (load is heavy, but not a dead short
where VOUT = 0. Limiting response will be the same
for dead shorts).
F) Thermal shutdown followed by thermal cycling.
G) Excessive load released, normal load remains.
MIC2017 drops out of current limiting.
H) FAULT/ delay period followed by FAULT/ going
HIGH. (Note: MIC2007/2017 does not provide a
FAULT/ output.)
Under Voltage Lock Out
Under voltage lock-out insures no anomalous operation
occurs before the device’s minimum input voltage of
2.5V had been achieved. Prior to reaching this voltage,
the output switch (power MOSFET) is OFF and no
circuit functions, such as ENABLE, are considered to be
valid or operative.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MIC2007YM6 | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: 制造商:Micrel Inc 功能描述: |
| MIC2007YM6 TR | 功能描述:電源開關 IC - USB Programmable Current Limit Single High-Side Switch wCslew + LdDschg - 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 |
| MIC2007YM6TR | 制造商:Micrel 功能描述:USB Power Switch Hi Side Single 0.2A, 2A |
| MIC2007YM6-TR | 功能描述:IC SW DISTRIBUTION ADJ SOT23-6 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 開關類型:通用 輸出數:1 比率 - 輸入:輸出:1:1 輸出配置:高端 輸出類型:P 通道 接口:開/關 電壓 - 負載:2.5 V ~ 5.5 V 電壓 - 電源（Vcc/Vdd）:不需要 電流 - 輸出（最大值）:2A 導通電阻（典型值）:70 毫歐 輸入類型:非反相 特性:負載釋放，壓擺率受控型 故障保護:限流（可調），超溫 工作溫度:-40°C ~ 85°C（TA） 封裝/外殼:SOT-23-6 供應商器件封裝:SOT-23-6 標準包裝:1 |
| MIC2007YM6TX | 功能描述:IC DISTRIBUTION SW ADJ SOT23-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 電源分配開關 系列:- 特色產品:XRP252 Switches 標準包裝:1 系列:- 類型:高端開關 輸出數:2 Rds（開）:140 毫歐 內部開關:是 電流限制:1.15A 輸入電壓:1.75 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-WFDFN 裸露焊盤 供應商設備封裝:10-TDFN（3x3） 包裝:Digi-Reel® 其它名稱:1016-1691-6 |
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