MIC2005-0.5LYM5 TR Micrel Inc, MIC2005-0.5LYM5 TR Datasheet - Page 24

• Manufacturer Part Number: MIC2005-0.5LYM5 TR
• Description: Fixed Current Limit Single High-Side Switch + Flag + Cslew, Active Low- 0.5A -
• Manufacturer: Micrel Inc
• Type: High Side Switchr

Specifications of MIC2005-0.5LYM5 TR

• Number Of Outputs: 1
• Rds (on): 100 mOhm
• Internal Switch(s): Yes
• Current Limit: 500mA
• Voltage - Input: 2.5 ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: SOT-23-5, SC-74A, SOT-25
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-3397-2

August 2011
I
The MIC20XX’s current-limiting circuitry, during current
limiting, is designed to act as a constant current source
to the load. As the load tries to pull more than the
allotted current, V
voltage differential increases. When V
1V, I
current on the system’s power supply and to limit
internal heating of the switch.
When measuring I
dependence in mind, otherwise the measurement data
may appear to indicate a problem when none really
exists. This voltage dependence is illustrated in Figures
4 and 5.
In Figure 4, output current is measured as V
pulled below V
1V below V
remains constant throughout the remainder of the test.
In Figure 5 this test is repeated but with V
exceeding 1V.
When V
responds by decreasing I
5. In this demonstration, V
I
V
load and the limiting current.
LIMIT
OUT
Micrel, Inc.
OUT
Figure 4. I
is the measured quantity. In real life applications
OUT
vs. I
is determined in accordance with Ω’s law by the
IN
drops below I
OUT
- V
IN
OUT
Measured
. Observe that once I
OUT
IN
, with the test terminating when V
in Current Limiting for V
> 1V, switch’s current limiting circuitry
OUT
OUT
it is important to bear this voltage
LIMIT
drops and the input to output
OUT
OUT
to reduce the drain of fault
, as can be seen in Figure
is being controlled and
LIMIT
IN
IN
is reached I
- V
- V
OUT
OUT
IN
exceeds
< 1V
- V
OUT
OUT
OUT
OUT
is
is
24
This folding back of I
I
and 7. The slope of V
I
switch and I
Figure 6. Normalized Output Current vs. Output Voltage
LIMIT
LIMIT
Figure 5. I
as a function of V
(where I
LIMIT
OUT
LIMIT
1.2
1.0
0.8
0.6
0.4
0.2
.
0
in Current Limiting for V
0
Normalized Output Current
vs. Output Voltage (5V)
= 1A) is determined by R
OUTPUT VOLTAGE (V)
1
LIMIT
OUT
OUT
2
can be generalized by plotting
, as shown below in Figures 6
between I
3
4
OUT
5
MIC20xx Family
M9999-080211-D
IN
= 0V and I
6
- V
OUT
ON
> 1V
of the
OUT
=