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PDF MIC2013 Data sheet ( Hoja de datos )
| Número de pieza | MIC2013 | |
| Descripción | (MIC2003 / MIC2013) Current Limiting Circuit Protector | |
| Fabricantes | Micrel Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de MIC2013 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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MIC2003/2013
Current Limiting Circuit Protector
General Description
MIC2003 and MIC2013 are high-side current limiting
devices, designed for power distribution applications in
PCs, PDAs, printers and peripheral devices.
MIC2003 and MIC2013 are thermally protected and will
www.DataShesehtu4Utd.coowmn should their internal temperature reach unsafe
levels, protecting both the device and the load, under
high current or fault conditions. Both devices are fully
self-contained, with the current limit value being factory
set to one of several convenient levels.
MIC2013 offers a unique new feature: Kickstart™,
which allows momentary high current surges to pass
unrestricted without sacrificing overall system safety.
MIC2003 and MIC2013 are excellent choices for USB
and IEEE 1394 (FireWire) applications or for any system
where current limiting and power control are desired.
The MIC2003 and MIC2013 are offered in space saving
6 pin SOT-23 and 2mm x 2mm MLF packages.
Data sheets and support documentation can be found
on Micrel’s web site at www.micrel.com.
Features
• 70mΩ typical on-resistance
• 2.5V - 5.5V operating range
• Pre-set current limit values of 0.5A, 0.8A and 1.2A
• Kickstart™
• Thermal Protection
• Under voltage lock-out
• Low quiescent current
Applications
• USB / IEEE 1394 Power Distribution
• Desktop and Laptop PCs
• Set top boxes
• Game consoles
• PDAs
• Printers
• Docking stations
• Chargers
_________________________________________________________________________________________________________
Typical Application
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-xxxx04
(408) 955-1690
1 page  
Micrel
MIC2003/MIC20013
AC Characteristics
Symbol
tLIMIT
tRESET
Parameter
Condition
Min Typ Max Units
Delay before current limiting
Secondary current limit
77 128 192 ms
(MIC2013)
Delay before resetting
Out of current limit following a 77 128 192 ms
Kickstart current limit delay,
current limit.
tLIMIT
(MIC2013)
ESD
Symbol
www.DataSheeVt4EUSD.c_oHmB
VESD_MCHN
Parameter
Electro Static Discharge
Voltage: Human Body Model
Electro Static 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 M9999-102605
[email protected] or (408) 955-1690
5 Page 
Micrel
MIC2003/MIC20013
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. This effect can be used
to advantage when large bypass capacitors are placed
on MIC2003/2013’s’s output. When power to the switch
is removed, the output capacitor will be automatically
discharged.
If discharging CLOAD is required by your application,
consider using MIC2003/2013 or MIC2007/2017 in place
of MIC2003/2013. These MIC2000 family members are
equipped with a discharge FET to insure complete
discharge of CLOAD.
Current Sensing and Limiting
MIC2003/2013 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 internally 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 MIC2003/2013 goes into thermal shutdown.
Kickstart (MIC2013 only)
The MIC2013 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 MIC2013 differs markedly
from MIC2003 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 the secondary limit, MIC2013 acts immediately
to restrict output current to the secondary limit for the
duration of the Kickstart period. After this time the
MIC2013 reverts to its normal current limit. An example
of Kickstart operation is shown below.
OUT
OUT
Figure 3. Kickstart Operation
Picture Key:
A) MIC2013 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.
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.
MIC2013 drops out of current limiting.
H) FAULT/ delay period followed by FAULT/ going
HIGH.
Slew Rate Control
Large capacitive loads can create significant current
surges when charged through a high-side switch such
as the MIC2003/2013. For this reason, MIC2003/2013
provides built-in slew rate control to limit the initial inrush
currents upon enabling the power MOSFET switch.
Slew rate control is active upon powering up, and upon
re-enabling the load. At shutdown, the discharge slew
rate is controlled by the external load and output
capacitor.
October 2005
11 M9999-102605
[email protected] or (408) 955-1690
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MIC2013.PDF ] | |
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