MP5006EQ データシートの表示（PDF） - Monolithic Power Systems
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MP5006EQ
Monolithic Power Systems
MP5006EQ Datasheet PDF : 13 Pages
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MP5006 – 5V, 1A- 5A PROGRAMMABLE CURRENT LIMIT SWITCH WITH AUTO ENABLE
CURRENT LIMIT
The desired current limit is a function of the
external current limit resistor.
Table 1―Current Limit vs. Current Limit Resistor
(VIN =5V)
Current Limit Resistor
(Ω)
24
50
75
100
Trip Current
(A)
3
2 1.78 1.67
Hold Current
(A)
1.55 0.76 0.5 0.38
When the part is active, if load reaches trip
current (minimum threshold current triggering
overcurrent protection) or a short is present, the
part switches into to a constant-current (hold
current) mode. Part will enter thermal cycling only
if the overcurrent condition stays long enough to
trigger thermal protection.
However, when the part is powered up by VCC or
EN, the load current should be smaller than hold
current. Otherwise, the part can’t be fully turned
on.
In a typical application using a current limit
resistor of 24Ω, the trip current will be 3A and the
hold current will be 1.55A. If the device is in its
normal operating state and passing 1.55A it will
need to dissipate only 105.7mW with the very low
on resistance of 44mΩ. For the package
dissipation of 50°C/Watt, the temperature rise will
only be + 5.3°C. Combined with a 25°C ambient,
this is only 30.3°C total package temperature.
During a short circuit condition, the device now
has 5V across it and the hold current clamps at
1.55A and therefore must dissipate 7.75W. At
50°C/watt, if uncontrolled, the temperature would
rise above the MP5006 thermal protection
(+175°C) and shutdown the device to cause the
temperature to drop below a hysteresis level.
Proper heat sink must be used if the device is
intended to supply the hold current and not
shutdown. Without a heat sink, hold current
should be maintained below 600mA at + 25°C
and below 360mA at +85°C to prevent the device
from activating the thermal shutdown.
RISE TIME
The rise time is a function of the capacitor (Cdv/dt)
on the dv/dt pin.
Table 2―Rise Time vs. Cdv/dt
Cdv/dt
Rise Time*
none 50pF 500pF
(TYPICAL)
1.1 2.2 12.3
(ms)
* Notes: Rise Time = KRT*(50pF+Cdv/dt), KRT =22E6
1nF
23.5
The “rise time” is measured by from 10% to 90%
of output voltage.
U
Input
90%
Output
10%
Enable
Rise Time
t
Figure 2―Rise Time
FAULT AND ENABLE PIN
The Enable/Fault Pin is a Bi-Directional I/O with a
weak pull up current (25uA typical). It functions to
enable/disable the part.
Enable pin as an input:
1. Low disables the part.
2. High enables the part.
Enable pin as an output:
1. The pull up current may (if not over
ridden) allow a “wired nor” pull up to
enable the part.
2. An under voltage will cause a low on the
enable pin.
3. A thermal fault will cause a low level on
the enable pin.
MP5006 Rev.0.92
www.MonolithicPower.com
9
12/27/2013
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
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