MIC2009YM6 TX Micrel Inc, MIC2009YM6 TX Datasheet - Page 14

• Manufacturer Part Number: MIC2009YM6 TX
• Manufacturer: Micrel Inc

Specifications of MIC2009YM6 TX

• Short Circuit Current Limit: 0.2 to 2A
• Input Voltage Range: 2.5 to 5.5V
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 6
• Package Type: SOT-23
• Lead Free Status / RoHS Status: Compliant

September 2005
Micrel
This folding back of I
I
of V
1) is determined by R
LIMIT
Figure 5. I
Figure 4. I
OUT
as a function of V
between I
OUT
OUT
in Current Limiting for V
in Current Limiting for V
OUT
LIMIT
= 0 and I
ON
OUT
of MIC2009/2019 and I
can be generalized by plotting
, as shown below. The slope
OUT
= I
LIMIT
(where I
IN
IN
- V
- V
OUT
LIMIT
OUT
LIMIT
≤1V
.
>1V
=
14
Kickstart (MIC2019)
Kickstart allows brief current surges to pass to the load
before the onset of normal current limiting. This, in turn,
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 the MIC2019. 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
MIC2019. This is because 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
1.2
1.0
0.8
0.6
0.4
0.2
1.2
1.0
0.8
0.6
0.4
0.2
0
0
0
0
Normalized Output Current
Normalized Output Current
vs. Output Voltage (2.5V)
vs. Output Voltage (5V)
0.5
OUTPUT VOLTAGE (V)
1
OUTPUT VOLTAGE (V)
Figure 6.
Figure 7.
1.0
2
1.5
3
2.0
4
MIC2009/MIC2019
2.5
5
[phone]
3.0
M9999-092305
6