MIC1344YFT-EV

MIC1344YFT-EV Datasheet

MIC1344 Evaluation Board

Part	Datasheet
MIC1344YFT-EV	MIC1344YFT-EV (pdf)

PDF Datasheet Preview
MIC1344 Evaluation Board Smart, 3A, Two-Channel, Power ORing Switch The MIC1344 is an advanced two input, one output, hotswappable, power multiplexer. It has both automatic and manual input selection and four status outputs. The MIC1344 evalaution board provides a method to evaluate the part, and understand its functionality. The evaluation board is not intended to demonstrate the minimum size or most compact PCB layout. The basic parameters of the evaluation board are: VINA or VINB supply voltage − 2.8V to 5.5V OUT current − 0 to 3A Datasheets and support documentation are available on Micrel’s web site at: Power-Up Precautions Applying a negative voltage to the VINA or VINB terminals may damage the device. In addition, the maximum VIN operating voltage of the MIC1344 evaluation board is 5.5V. Getting Started Set the ILIM resistors to the correct value for input source capability and the load see Equation The evaluation board is provided with a current limit of 3A. Connect a power supply to the VINA J2 and/or VINB J4 , terminals. Connect a 5V supply to VCC J1 or TP1 . Connect the load to VOUT J6 . Turn on the VIN power and observe the operation of the MIC1344 in the status LEDs, and the output voltage see Table 2 for an explanation of the status LEDs . Ordering Information Part Number MIC1344YFT EB MIC1344 Smart, 3A, Two-Channel, Power Oring Switch Evaluation Board Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 408 944-0800 • fax + 1 408 474-1000 • April 24, 2015 Micrel, Inc. MIC1344 Evaluation Board Evaluation Board Description The current limit for the MIC1344 VINA and VINB is set on the board to be by resistors R11 and R12 being If a different current limit is desired, adjust R11 for VINA or R12 for VINB using Equation 1: section in the Application Information section of the MIC1344 datasheet for further information. RILIM 2485 − 146µA Eq. 1 Where: ICL = Desired current limit A RILIM = Resistor value for ILIM pin Setting resistor RILIM equal to zero is not recommended as it will disable current limiting. The MIC1344 ENA and ENB are not connected to a supply rail the internal resistor on each of the enable pins pulls the pins low, placing the part into automatic mode. If another mode is desired the enable pins can be connected to an external voltage VCC via jumpers TP3 or TP5 or driven directly, see Evaluation Board Schematic. Table 1 shows how the MIC1344 will route the input power as controlled by the ENA and ENB input pins. Table ENA and ENB Input Power Selection ENA ENB Power Input Selected The higher voltage on either INA or INB automatically selected if > VUVLO. No input selected can be used for cascading other MIC1344 power inputs . 0 INA power input selected if VINA > VUVLO. 1 INB power input selected if VINB > VUVLO. VCC is a supply pin to power up the pull-up resistors on STAOK, STBOK, as well as drive ENA, and ENB. VCC can be connected to VOUT or an external supply, please see the “Digital Status Output Pins” sub- Figure MIC1344YFT Evaluation Board LED Key There are nine status LEDs included on the MIC1344 evaluation board, see Table As seen in the Evaluation Board Schematic, the blue LEDs LED4, LED5, LED6 and LED8 are associated with the functionality of the INA input. The green LED’s LED1, LED2, LED3 and LED9 , are associated with the functionality of the INB input. The one white LED LED10 is associated with OUT. When ENA or ENB LEDs are turned on, then the enable input control signals are high. Refer to Table 1 for an explanation of the enable signals. STAOK or STBOK LEDs will light only if a fault should occur. The MIC1344 datasheet includes a complete explanation of the STAOK and STBOK and the input conditions that cause these pins to go active low impedance . and indicate which of the two inputs A or B , is selected. When an input is selected, the associated LED turns on. April 24, 2015 Micrel, Inc. MIC1344 Evaluation Board Table MIC1344 Status LED Description LED # Color Pin Function Green STBOK Lights when fault occurs on VINB, or thermal shutdown Green Lights when VINB is selected Green ENB Lights when ENB is high Blue ENA Lights when ENA is high Blue Lights when VINA is selected Blue STAOK Lights when fault occurs on VINA, or thermal shutdown Blue VINA Lights when VINA is above Green VINB Lights when VINB is above

PDF Datasheet Preview

MIC1344 Evaluation Board

Smart, 3A, Two-Channel, Power ORing Switch

The MIC1344 is an advanced two input, one output, hotswappable, power multiplexer. It has both automatic and manual input selection and four status outputs.

The MIC1344 evalaution board provides a method to evaluate the part, and understand its functionality. The evaluation board is not intended to demonstrate the minimum size or most compact PCB layout.

The basic parameters of the evaluation board are:

VINA or VINB supply voltage − 2.8V to 5.5V

OUT current − 0 to 3A

Datasheets and support documentation are available on Micrel’s web site at:

Power-Up Precautions Applying a negative voltage to the VINA or VINB terminals may damage the device. In addition, the maximum VIN operating voltage of the MIC1344 evaluation board is 5.5V.

Getting Started

Set the ILIM resistors to the correct value for input source capability and the load see Equation The evaluation board is provided with a current limit of 3A.

Connect a power supply to the VINA J2 and/or VINB J4 , terminals.

Connect a 5V supply to VCC J1 or TP1 .

Connect the load to VOUT J6 .

Turn on the VIN power and observe the operation of the MIC1344 in the status LEDs, and the output voltage see Table 2 for an explanation of the status LEDs .
Ordering Information

Part Number MIC1344YFT EB

MIC1344 Smart, 3A, Two-Channel, Power Oring Switch Evaluation Board

Micrel Inc.
• 2180 Fortune Drive
• San Jose, CA 95131
• USA
• tel +1 408 944-0800
• fax + 1 408 474-1000
•

April 24, 2015

Micrel, Inc.

MIC1344 Evaluation Board

Evaluation Board Description

The current limit for the MIC1344 VINA and VINB is set on the board to be by resistors R11 and R12 being If a different current limit is desired, adjust R11 for VINA or R12 for VINB using Equation 1:
section in the Application Information section of the MIC1344 datasheet for further information.

RILIM
2485 − 146µA

Eq. 1

Where:

ICL = Desired current limit A RILIM = Resistor value for ILIM pin Setting resistor RILIM equal to zero is not recommended as it will disable current limiting.

The MIC1344 ENA and ENB are not connected to a supply rail the internal resistor on each of the enable pins pulls the pins low, placing the part into automatic mode. If another mode is desired the enable pins can be connected to an external voltage VCC via jumpers TP3 or TP5 or driven directly, see Evaluation Board Schematic. Table 1 shows how the MIC1344 will route the input power as controlled by the ENA and ENB input pins.

Table ENA and ENB Input Power Selection ENA ENB Power Input Selected

The higher voltage on either INA or INB automatically selected if > VUVLO.

No input selected can be used for cascading other MIC1344 power inputs .
0 INA power input selected if VINA > VUVLO.
1 INB power input selected if VINB > VUVLO.

VCC is a supply pin to power up the pull-up resistors on STAOK, STBOK, as well as drive ENA, and ENB. VCC can be connected to VOUT or an external supply, please see the “Digital Status Output Pins” sub-

Figure MIC1344YFT Evaluation Board

LED Key

There are nine status LEDs included on the MIC1344 evaluation board, see Table As seen in the Evaluation Board Schematic, the blue LEDs LED4, LED5, LED6 and LED8 are associated with the functionality of the INA input. The green LED’s LED1, LED2, LED3 and LED9 , are associated with the functionality of the INB input. The one white LED LED10 is associated with OUT. When ENA or ENB LEDs are turned on, then the enable input control signals are high. Refer to Table 1 for an explanation of the enable signals. STAOK or STBOK LEDs will light only if a fault should occur. The MIC1344 datasheet includes a complete explanation of the STAOK and STBOK and the input conditions that cause these pins to go active low impedance . and indicate which of the two inputs A or B , is selected. When an input is selected, the associated LED turns on.

April 24, 2015

Micrel, Inc.

MIC1344 Evaluation Board

Table MIC1344 Status LED Description

LED # Color

Pin Function

Green STBOK Lights when fault occurs on VINB, or thermal shutdown

Green Lights when VINB is selected

Green ENB Lights when ENB is high

Blue

ENA Lights when ENA is high

Blue Lights when VINA is selected

Blue STAOK Lights when fault occurs on VINA, or thermal shutdown

Blue

VINA Lights when VINA is above

Green VINB Lights when VINB is above

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Datasheet ID: MIC1344YFT-EV 647889