MIC2005-0.5LYM5 TR Micrel Inc, MIC2005-0.5LYM5 TR Datasheet - Page 27

• 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
The VUVLO comparator uses no hysteresis. This is
because the VUVLO blanking timer prevents any
chattering that might otherwise occur if V
the trigger point. The timer is reset by upward crossings
of the trip point such that V
point for the full 32ms period for load disengagement to
occur.
In selecting a V
not make this value less than 2.5V. A minimum of 2.5V
is required for the MIC20X6’s internal circuitry to
operate properly. VUVLO trip points below 2.5V will
result in erratic or unpredictable operation.
Kickstart™
Only parts in bold have Kickstart™.
(Not available in 5-pin SOT-23 packages).
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 the switch.
The Kickstart™ period is governed by an internal timer
which allows current to pass up to the secondary
current limit (I
normal (primary) current limiting goes into action.
During Kickstart™, a secondary current-limiting circuit
is monitoring output current to prevent damage to the
switch, 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 4A 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
load persists.
Once the switch 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
Upon cooling, if the load is still present I
I
OUT
LIMIT_2nd
Micrel, Inc.
2003
2013
to its programmed limit for as long as the excessive
.
2004
2014
LIMIT_2nd
TRIP
2005X
2015
voltage, the designer is cautioned to
) to the load for 128ms and then
2006
2016
IN
must remain below the trip
2007
2017
OUT
2008
2018
IN
varies about
OUT
I
LIMIT
2009X
2019X
, not
0A.
27
Automatic Load Discharge
Only parts in bold have automatic load discharge.
Automatic discharge is a valuable feature when it is
desirable to quickly remove charge from the V
This allows for a quicker power-down of the load. This
also prevents any charge from being presented to a
device being connected to the V
USB, 1394, PCMCIA, and CableCARD™.
Automatic discharge is performed by a shunt MOSFET
from V
break before make action is performed turning off the
main power MOSFET and then enabling the shunt
MOSFET. The total resistance of the MOSFET and
internal resistances is typically 126Ω.
Supply Filtering
A minimum 1μF bypass capacitor positioned close to
the V
practice and required for proper operation of the switch.
This will control supply transients and ringing. Without a
bypass capacitor, large current surges or a short may
cause sufficient ringing on V
inductance) to cause erratic operation of the switch’s
control circuitry. For best-performance good quality,
low-ESR capacitors are recommended, preferably
ceramic.
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.
2003
2013
IN
OUT
and GND pins of the switch is both good design
2004
2014
pin to GND. When the switch is disabled, a
2005X
Figure 11. Kickstart™
2015
2006
2016
2007
2017
IN
OUT
(from supply lead
pin, for example,
MIC20xx Family
M9999-080211-D
2008
2018
2009X
2019X
OUT
pin.