MIC2013-1.2YML TR Micrel Inc, MIC2013-1.2YML TR Datasheet - Page 14

• Manufacturer Part Number: MIC2013-1.2YML TR
• Description: IC DISTRIBUTION SW 1.2A 6-MLF
• Manufacturer: Micrel Inc
• Type: High Side Switchr

Specifications of MIC2013-1.2YML TR

• Number Of Outputs: 1
• Rds (on): 100 mOhm
• Internal Switch(s): Yes
• Current Limit: 1.2A
• Voltage - Input: 2.5 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 6-MLF®, QFN
• Input Voltage Range: 2.5 to 5.5V
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 6
• Package Type: MLF
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-1684-2; MIC2013-1.2YMLTR; MIC2013-1.2YMLTR

October 2005
Kickstart (MIC2013)
Kickstart allows brief current surges to pass to the load
before the onset of normal current limiting, which
permits dynamic loads to draw bursts of energy without
sacrificing system safety.
Functionally, Kickstart is a forced override of the normal
current limiting function provided by MIC2013. The
Kickstart period is governed by an internal timer which
allows current to pass unimpeded to the load for 128ms
and then normal (primary) current limiting goes into
action.
During Kickstart a secondary current limiting circuit is
monitoring output current to prevent damage to the
MIC2013, as a hard short combined with a robust power
supply can result in currents of many tens of amperes.
This secondary current limit is nominally set at 4 Amps
and reacts immediately and independently of the
Kickstart period. Once the Kickstart timer has finished its
count the primary current limiting circuit takes over and
holds I
excessive load persists.
Once MIC2013 drops out of current limiting the Kickstart
timer initiates a lock-out period of 128ms such that no
further bursts of current above the primary current limit,
will be allowed until the lock-out period has expired.
Kickstart may be over-ridden by the thermal protection
circuit and if sufficient internal heating occurs, Kickstart
will be terminated and I
load is still present I
OUT
to its programmed limit for as long as the
1.2
1.0
0.8
0.6
0.4
0.2
0
0
Normalized Output Current
vs. Output Voltage (2.5V)
0.5
OUT
OUTPUT VOLTAGE (V)
Figure 7.
1.0
OUT
I
LIMIT
1.5
, not I
0. Upon cooling, if the
2.0
KICKSTART
2.5
3.0
.
14
V
Supply Filtering
A 0.1µF to 1µF bypass capacitor positioned close to the
V
practice
MIC2003/2013. This will control supply transients and
ringing. Without a bypass capacitor, large current surges
or an output short may cause sufficient ringing on V
(from supply lead inductance) to cause erratic operation
of MIC2003/2013’s control circuitry. Good quality, low
ESR capacitors, such as Panasonic’s TE or ECJ series,
are suggested.
When bypassing with capacitors of 10µF and up, it is
good practice to place a smaller value capacitor in
parallel with the larger to handle the high frequency
components of any line transients. Values in the range
of 0.01µF to 0.1µF are recommended. Again, good
quality, low ESR capacitors should be chosen.
Power Dissipation
Power dissipation depends on several factors such as
the load, PCB layout, ambient temperature, and supply
voltage. Calculation of power dissipation can be
accomplished by the following equation:
To relate this to junction temperature, the following
equation can be used:
I
OUT
OUT
IN
0
and GND pins of MIC2003/2013 is both good design
P
T
D
J
=
Kickstart
=
P
R
and
D
100
DS(ON)
×
R
Current Limiting
θ
required
(J
Figure 9. Kickstart
×
-
200
A)
[e-mail]
(
I
OUT
+
T
A
Time (ms)
)
2
Load Removed
300
for
proper
400
or [phone]
operation
M9999-102605
500
600
of
IN