MIC2016-0.5YML TR Micrel Inc, MIC2016-0.5YML TR Datasheet - Page 21

• Manufacturer Part Number: MIC2016-0.5YML TR
• Description: IC DISTRIBUTION SW 0.5A 6-MLF
• Manufacturer: Micrel Inc
• Type: High Side Switchr

Specifications of MIC2016-0.5YML 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: 6-MLF®, QFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 576-2593-2; MIC2016-0.5YML TR; MIC2016-0.5YMLTR; MIC2016-0.5YMLTR

Functional Description
V
V
circuitry driving the switch and the input (Source
connection) of the power MOSFET switch. V
Drain connection of the power MOSFET and supplies
power to the load. In a typical circuit, current flows from
V
directional when enabled, if V
current will flow from V
When the switch is disabled, current will not flow to the
load, except for a small unavoidable leakage current of a
few microamps. However, should V
more than a diode drop (~0.6 V), while the switch is
disabled, current will flow from output to input via the
power MOSFET’s body diode.
If discharging C
consider using MIC20X4 or MIC20X7; these MIC20XX
family members are equipped with a discharge FET to
insure complete discharge of C
Current Sensing and Limiting
MIC20XX protects the system power supply and load
from damage by continuously monitoring current through
the on-chip power MOSFET. Load current is monitored
by means of a current mirror in parallel with the power
MOSFET switch. Current limiting is invoked when the
load exceeds the set over-current threshold. When
current limiting is activated the output current is
constrained to the limit value, and remains at this level
until either the load/fault is removed, the load’s current
requirement drops below the limiting value, or the switch
goes into thermal shutdown.
Kickstart™
Only parts in bold have Kickstart™.
(Not available in 5-pin SOT-23 packages)
The MIC201X is designed to allow momentary current
surges (Kickstart™) before the onset of current limiting,
which permits dynamic loads, such as small disk drives
or portable printers to draw the energy needed to
overcome inertial loads without sacrificing system safety.
In this respect, the Kickstart™ parts (MIC201X) differs
markedly from the non-Kickstart™ parts (MIC200X)
which immediately limit load current, potentially starving
the motor and causing the appliance to stall or stutter.
During this delay period, typically 128ms, a secondary
current limit is in effect. If the load demands a current in
excess the secondary limit, MIC201X acts immediately
to restrict output current to the secondary limit for the
duration of the Kickstart™ period. After this time the
MIC201X reverts to its normal current limit. An example
February 2011
IN
IN
IN
2003
2013
Micrel, Inc.
and V
is both the power supply connection for the internal
to V
OUT
2004
2014
OUT
toward the load. Since the switch is bi-
2005X
2015
LOAD
OUT
is required by your application,
2006
2016
to V
IN
LOAD
.
OUT
2007
2017
.
is greater than V
OUT
2008
2018
exceed V
OUT
2009X
2019X
is the
IN
by
IN
,
21
of Kickstart™ operation is shown below.
Figure 3 Label Key:
Under Voltage Lock Out
Under voltage lock-out insures no anomalous operation
occurs before the device’s minimum input voltage of
UVLO
2.5V maximum had been achieved. Prior to reaching this
voltage, the output switch (power MOSFET) is OFF and
no circuit functions, such as FAULT/ or ENABLE, are
considered to be valid or operative.
A. MIC201X is enabled into an excessive load
B. R
C. Kickstart™ period.
D. Current limiting initiated. FAULT/ goes LOW.
E. V
F. Thermal shutdown followed by thermal cycling.
G. Excessive load released, normal load remains.
H. FAULT/ delay period followed by FAULT/ going
THRESHOLD
(slew rate limiting not visible at this time scale)
The initial current surge is limited by either the
overall circuit resistance and power supply
compliance, or the secondary current limit,
whichever is less.
heating (effect exaggerated for emphasis).
short where V
the same for dead shorts).
MIC201X drops out of current limiting.
HIGH.
OUT
ON
of the power FET increases due to internal
Figure 3. Kickstart™ Operation
is non-zero (load is heavy, but not a dead
which is 2V minimum, 2.25V typical, and
OUT
= 0V. Limiting response will be
MIC20xx Family
M9999-020311-D