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PDF MIC2017 Data sheet ( Hoja de datos )
| Número de pieza | MIC2017 | |
| Descripción | (MIC2007 / MIC2017) Adjustable Current Limit Power Distribution Switch | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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MIC2007/2017
Adjustable Current Limit
Power Distribution Switch
General Description
Features
The MIC2007 and MIC2017 are current limiting, high-
side power switches, designed for general purpose
power distribution and control in PCs, PDAs, printers
and other self-powered systems.
www.DataSheTeht4eU.cMomIC2007 and MIC2017’s primary functions are
current limiting and power switching. They are thermally
protected and will shutdown should their internal
temperature reach unsafe levels. This protects both the
device and the load under high current or fault
conditions.
Features include: user adjustable output slew rate
limiting, automatic load discharge and under voltage
detection. Both devices offer user programmable current
limiting thereby providing designers a continuous
spectrum of current limits from 200mA to 2 Amps.
The MIC2017 offers a unique new feature: Kickstart™,
which allows momentary high current surges to pass
unrestricted without sacrificing overall system safety.
• 70mΩ typical on-resistance
• 2.5V – 5.5V operating range
• User adjustable current limit: 0.2A – 2.0A
• Kickstart™
• User adjustable output slew rate control
• Automatic load discharge
• Thermal protection
• Under voltage lock-out
• Low quiescent current
Applications
• USB / IEEE 1394 power distribution
• Desktop and laptop PCs
• Set top boxes
• Game consoles
The MIC2007 and MIC2017 are excellent choices for
USB and IEEE 1394 (FireWire) applications or for any
system where current limiting and power control are
desired.
The MIC2007 and MIC2017 are offered in space saving
6-pin SOT-23 and 2mm x 2mm MLFTM packages.
• PDAs
• Printers
• Docking stations
• Chargers
_________________________________________________________________________________________________________
Typical Application
5V Supply
USB
Controller
MIC2007
MIC2017
VIN VOUT
CSLEW
GND
ENABLE ILIMIT
VBUS
D+/D-
USB
Port
D+/D-
USB
Port
Figure 1. Typical Application Circuit
Kickstart is a trademark of Micrel, Inc
MLF and MicroLeadFrame are trademarks of Amkor Technology, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 2005
M9999-102805
1 page  
Micrel
MIC2007/MIC2017
AC Characteristics
Symbol
tRISE
Parameter
Output turn-ON rise time
tD_LIMIT
tRESET
tON_DLY
Delay before current limiting
Delay before resetting
Kickstart current limit delay,
tD_LIMIT
Output Turn-on Delay
www.DataSheet4U.com
tOFF_DLY
Output Turn-off Delay
Condition
RL = 10Ω, CLOAD = 1µF,
VOUT = 10% to 90%
MIC2017
Out of current limit following a
current limit event.
MIC2017
RL = 43Ω, CL = 120µF,
CSLEW ≤ 10pF,
VEN = 50% to VOUT = 10%
RL = 43Ω, CL = 120µF,
CSLEW ≤ 10pF,
VEN = 50% to VOUT = 90%
Min Typ Max Units
500 1000 1500
µs
77 128 192 ms
77 128 192 ms
1000 1500
µs
700 µs
ESD
Symbol
VESD_HB
VESD_MCHN
Parameter
Electrostatic Discharge
Voltage: Human Body Model
Electrostatic Discharge
Voltage: Machine Model
Condition
VOUT and GND
All other pins
All pins
Machine Model
Min
±4
±2
± 200
Typ
Notes:
1. Exceeding the absolute maximum rating may damage the device.
2. The device is not guaranteed to function outside its operating rating.
3. Devices are ESD sensitive. Handling precautions recommended. Human body model: 1.5k in series with 100pF.
4. Specification for packaged product only.
5. Requires proper thermal mounting to achieve this performance.
Max
Units
kV
kV
V
October 2005 5 M9999-102805
5 Page 
Micrel
MIC2007/MIC2017
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
www.DataSheaetf4eUw.commicroamps. 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.
OUT
OUT
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.
October 2005 11 M9999-102805
11 Page | ||
| Páginas | Total 17 Páginas | |
| PDF Descargar | [ Datasheet MIC2017.PDF ] | |
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