MIC2548A-1YM Micrel Inc, MIC2548A-1YM Datasheet - Page 15

• Manufacturer Part Number: MIC2548A-1YM
• Description: IC SW CURR LIMIT HI SIDE 8SOIC
• Manufacturer: Micrel Inc
• Type: High Sider

Specifications of MIC2548A-1YM

• Input Type: Non-Inverting
• Number Of Outputs: 1
• On-state Resistance: 80 mOhm
• Current - Peak Output: 1.5A
• Voltage - Supply: 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: *
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Current - Output / Channel: -
• Other names: 576-3608-5

Setting I
The
programmable and controlled by a resistor connected
between the I
resistor is determined by the following equation:
or
For example:
Looking in the Electrical specifications we will find CLF
at I
For the sake of this example, we will say the typical
value of CLF at an I
equation above:
(the closest standard 1% value)
Designers should be aware that variations in the
measured I
because of small differences between individual ICs
(inherent in silicon processing) resulting in a spread of
I
was used to calculate R
spread by using the minimum and maximum values of
CLF and the calculated value of R
LIMIT
Micrel, Inc.
April 2010
LIMIT
I
R
values. In the example above a typical value of CLF
LIMIT
SET
Min
184
I
I
MIC2544A/2548A’s
LIMIT_MIN
= 1 A.
LIMIT
R
R
LIMIT
SET
SET
=
=
CurrentLim
_
LIMIT
CurrentLim
MAX
(
= 232Ω
Ω
LIMIT
)
=
Table 1. CLF at I
Set I
=
for a given R
=
184V
232
230V
1.0A
I
276
232
pin and ground. The value of this
LIMIT
R
Typ
230
LIMIT
Ω
SET
itFactor(C
OUT
V
Ω
=
itFactor(V
(A)
=
. 0
=
= 1.0A
SET
230
. 1
of 1A is 230V. Applying the
79
. One can determine I
19
A
Ω
current
A
LF)
LIMIT
SET
)
SET
Max
276
= 1A
.
resistor, will occur
limit
Units
is
V
LIMIT
user
’s
15
Giving one a maximum I
of:
Short-Circuit Protection
In the event of a short circuit, the output current will fold
back to approximately 70% of the short-circuit current-
limit.
Fault Flag
FLG is an N-channel, open-drain MOSFET output. The
fault flag is active (low) for current-limit or thermal
shutdown conditions. The flag output MOSFET is
capable of sinking a 10mA load to typically 100mV
above ground. The FLG response delay time t
typically 5µs.
I
0.79A (-21%)
LIMIT_MIN
I_OUT
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.1
1.2
1.3
1.4
1.5
1
Table 2. MIC2544A/2548A R
R_SET
1150
767
575
460
383
329
288
256
230
209
192
177
164
153
I
1.0A
LIMIT_TYP
LIMIT
I_OUT_Min
0.140
0.210
0.280
0.350
0.480
0.560
0.640
0.720
0.800
0.880
0.960
1.040
1.120
1.200
variation over-temperature
SET
MIC2544A/2548A
Table
I_OUT_Max
M9999-043010
I
1.19A (+19%)
LIMIT_MAX
0.260
0.390
0.520
0.650
0.720
0.840
0.960
1.080
1.200
1.320
1.440
1.560
1.680
1.800
D
is