Microchip MIC95410 Handleiding

Microchip Niet gecategoriseerd MIC95410

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MIC95410 Evaluation Board
6.6mΩ R
DS(ON)
, 7A, 5.5V
IN
Load Switch in
1.2 ackagemm x 2.0mm QFN P
General Description
The MIC95410 is a high side load switch- used for
computing and dense embedded computing -for ultra
boards where high- , -current low voltage rails from sub-1V
to 5.5V have to be sectioned. The integrated 6.6mΩ
RDS(ON) N-channel MOSFET ensures low voltage drop and
low power dissipation while delivering up to 7A of load
current.
The MIC95410 provides user-adjustable slew- -rate
controlled turn-on to limit the inrush current to the input
supply voltage.
The MIC95410 is available in thermally efficient, space -
saving 10- × pin 1.2mm 2.0mm QFN package with 0.5mm
pin pitch and an operating junction temperature range from
– 40°C to +125°C.
The basic parameters of the MIC95410 evaluation board
are the IN supply of 1V to 5.5 separated bias V and the
voltage from 2.7V to 9V. It also includes a TTL-logic level
turn- on command (CTL) and an output discharge function
when disabled.
Due to the mized pinout of the MIC95410opti , the
evaluation board can achieve only routing (top a two- -layer
and bottom), while internal planes are connected to GND
and kept as solid GND planes for best thermal
performance. See section.PCB Layout
MIC95410 datasheet and support documentation are
available on Micrel’s web site at: www.micrel.com.
Ordering Information
Part Number Description
MIC95410YFL EV MIC95410 Evaluation Board
Evaluation Board
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
October 1, 2014
Revision 1.0
Micrel, Inc.
MIC95410 Evaluation Board
Getting Started
Recommended Setup
The evaluation board setup comprisesMIC95410 of the
following : points
• A power supply with at least 7A of current
capability for IN, not to exceed 5.5V.
• A passive or active load which can handle up to
7A at 5.5V, connected at OUT (CON3) / GND
(CON4).
• A -low power bias supply for VS, 2.7V ≤ VVS . ≤ 9V
• A function generator for driving CTL.
• A -m . digital multi eter (DMM)
The bias supply pin VS can be shorted to IN by means of
the VS header located at the bottom of the board near the
label. In this case, evaluation can be performed for 2.7V ≤
VIN ≤ 5.5V, and the low- power bias supply for VS can be
avoided. Similarly, the CTL pin can be shorted to VS by
means of header J1, making the function generator
redundant.
Power- Up Precautions
The evaluation board does not have reverse polarity
protection. Applying a negative voltage to the IN or VS
terminals may damage the device.
The turn on of the MIC95410, especially in- the presence of
large output capacitive loads associated with long input
leads, -may cause some L C ringing. The ringing may
cause false current readings and generate voltage
overshoot. educing R the length of the input leads as much
as possible (10cm or less) or using a large electrolytic
decoupling capacitor (up to some mF) between IN (CON1)
and GND (CON2) of the evaluation board is
recommended.
Recommended Steps
1. Ensure no jumper is installed at J1.
R1 will pull down the CTL pin and keep the MIC95410
disabled until Step 8.
2. supply. Connect the VS
Connect the VS bias supply to terminals - -J2 2 (VS)/J2
1 (GND). J2 is the connector at the bottom edge of the
e bovaluation ard.
Alternatively, VS can be shorted to IN by installing a
jumper across positions J2-3 (IN) and J2-2 (VS). This
is possible only for 2.7V ≤ VIN ≤ 5.5V. If VIN is lower
than 2.7V, an external independent bias supply for VS
is mandatory.
3. supply. Connect the IN
Connect the supply to the power IN (CON1) and GND
(CON2) terminals and regulate its current limit to
approximately 7.5A. An ammeter may be placed
between the input supply and the IN terminal to the
evaluation board. Ensure that the supply voltage is
monitored at the IN terminal ( ) se CON1 or J5 , becau
the ammeter and/or power lead resistance can reduce
the voltage supplied to the input. Keep the power
supply disabled; do not apply power until S 7tep .
4. . Connect the load to the output terminals
Connect the load across the terminals OUT
(CON3) (CON4)/GND . Adjust the load. Do not exceed
a 7A Output voltage may be monitored at current. J4.
5. Connect the DMM across the MIC95410.
Set the DMM to a mV voltage reading and connect it
between J6-1 (IN_S, positive terminal) and J6-2
(OUT_S, negative terminal). This is for reading the
voltage drop across the MIC95410.
6. Connect the function generator to CTL.
Connect the function generator between J1-2 (CTL)
and J1- 1 (GND). Set it to DC mode with the level
between 2.4V and VVS (unterminated). Keep the output
disabled.
7. suppl . Enable the IN and VS ies
8. MIC95410 the Enable .
Enable the MIC95410 by enabling the function
generator output. Alternatively, install a jumper across
J1-2 -3 (CTL) and J1 (VS).
Verify that the input voltage passes to the output and
monitor the voltage drop across the MIC95410 with the
DMM.
October 1, 2014 2 Revision 1.0
Micrel, Inc.
MIC95410 Evaluation Board
Evaluation Board Description
J1 - Control Input CTL ( )
The MIC95410 can be turned ON or OFF by setting a TTL
high logic level to pin CTL (J1- -2). Pin J1 2 is pulled to
GND through R1, such that CTL is not left floating.
CTL can be driven either at DC (static) or by a square
wave signal. For square wave drive, ensure the frequency
of the signal is low enough to limit the turn-on/turn-off
power dissipation within safe limits. Also depending on the
load, frequencies of 1Hz or lower are recommended.
For static drive, installing/removing a jumper across
positions J2-2 (CTL) and J2 3 (VS) is adequate.-
J - Supply 2 VS
The MIC95410 has separate bias pin (VS) for powering a
the charge pump (2.7V ≤ VVS ≤ 9V). The bias power supply
should be connected at J2-2 (VS)/J2-1 (GND).
Alternatively, VS can be shorted to IN by installing a
jumper across positions J2-3 (IN) and J2-2 (VS). This is
possible only for 2.7V ≤ VIN ≤ 5.5V.
J3 - GC
GC ( of power MOSFET switch) can be g cate onnection
monitored at J3. Because the current sourcing capability of
GC is limited, ensure that the impedance of the monitoring
input does not cause excessive loading.
Install a capacitor in position C4 to adjust the turn -on
speed/inrush current.
J4 - OUT
J4 can be used to monitor the output voltage.
The MIC95410 output capacitance can be increased by
installing a 0603 ceramic capacitor in position C3A.
Note, this is a two-pin header with one pin connected to a
power supply voltage and the other pin connected to GND.
Never install a jumper on this header because it will short
the power supply to GND.
J5 - IN
J5 can be used to monitor the input voltage.
The MIC95410 input capacitance can be increased by
installing a 0603 ceramic capacitor in position C2A.
Note -that this is a two pin header with one pin connected
to a power supply voltage and the other pin connected to
GND. Never install a jumper on this header because it will
short the power supply to GND.
J6 ensing– Voltage Drop S
J6 can be used to monitor the voltage drop across the
MIC95410.
Please note that the solder joints and some unavoidable
copper trace distance also add up to the R DS(ON) of the
MIC95410 therefore , and , the measured resistive drop is
slightly larger than the pure intrinsic RDS(ON) contribution.
J7 apacitive – C LOAD
To emulate the effect of large load capacitors at the output
side of the MIC95410, it is possible to install a capacitor in
position C3B.
J7 can be used to connect/disconnect C3B.
October 1, 2014 3 Revision 1.0

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: MIC95410

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