MIC261201YJL-EV

MIC261201YJL-EV Datasheet

MIC261201 Evaluation Board

Part	Datasheet
MIC261201YJL-EV	MIC261201YJL-EV (pdf)

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MIC261201 Evaluation Board 28V, 12A Hyper Speed Control Synchronous DC/DC Buck Regulator SuperSwitcher II The MIC261201 DC-DC regulator operates over an input supply range of 4.5V to 28V, and provides a regulated output at up to 12A of output current. The output voltage is adjustable to 0.8V, with a typical accuracy of ±1% the device operates at a switching frequency of 600kHz. The switching frequency remains fairly constant, with changes in input voltage and output load. Micrel’s Hyper Speed Control architecture allows for ultra-fast transient response, while reducing the output capacitance and it also makes High VIN / Low VOUT operation possible. The MIC261201 utilizes an adaptive TON ripple control architecture. An undervoltage lockout feature is provided to ensure proper operation under power-sag conditions. It also includes an internal soft-start feature to reduce the inrush current. Foldback current limit and “hiccup” mode short-circuit protection, as well as thermal shutdown ensures protection of the IC during fault conditions. Note This evaluation board is for 12A applications. The datasheet and other supporting documentation can be found on Micrel’s web site at: Requirements The MIC261201 provides a 5V regulated output for input voltage VIN ranging from 5.5V to 28V. When VIN < 5.5V, VDD should be tied to PVIN pins to bypass the internal linear regulator by a jumper. The output load can either be active or passive. Precautions Getting Started Connect an external supply to the VIN terminal. Apply the desired input voltage to the VIN and ground terminals of the evaluation board, paying careful attention to polarity and supply voltage. An ammeter may be placed between the input supply and the VIN terminal to the evaluation board. Make sure that the supply voltage is monitored at the VIN terminal. The ammeter and/or power lead resistance can reduce the voltage supplied to the input. Connect the load to the VOUT and ground terminals. The load can be either passive resistive or active as in an electronic load . An ammeter can be placed between the load and the VOUT terminal. Ensure that the output voltage is monitored at the VOUT terminal. VOUT can be set to 0.9V, 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, or 5.0V by a jumper. If a different voltage is needed, adjust it by changing the feedback resistors. See “Output Voltage” section. Enable the MIC261201. The EN pin is provided on the evaluation board. The output of the MIC261201 turns on when VDD exceeds the UVLO threshold. Turn off he output of the MIC261201 by shorting the EN pin to ground. A connection on the board provides easy access to the enable pin. Ordering Information Part Number MIC261201YJL EV 12 A HSC DC-DC Regulator Evaluation Board Hyper Speed Control is a trademark of Micrel, Inc MLF and MicroLead Frame are registered trademarks of Amkor Technology, Inc. Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 408 944-0800 • fax + 1 408 474-1000 • July 2011 M9999-071511-A Micrel, Inc. Output Voltage The output voltage on the MIC261201 evaluation board is adjustable. Set it by adjusting the feedback resistors R4 and one of R5, R6, R7, R8, R9, R10, R11, or R12 and can be calculated as follows as an example: VOUT VREF R4 R7 where VREF = 0.8V. The output voltage above is set at the factory for 1.2V output, but it can easily be changed by moving the jumper to a respective position to get an indicated voltage on the board. If a desired voltage is not shown on the board, modify it by removing R4 and R7 MIC261201 12A Evaluation Board and replacing them with the values that yield the desired output voltage. Once R4 is selected, R7 can be calculated using: R7 = R4 x VREF VOUT − VREF For VREF = 0.8V: R7 = R4 x 0.8V VOUT − 0.8V The output voltage should not be set to exceed 5V due to the 6.3V rating of the output capacitor and on-line regulation limitation. Please refer to the “Setting Output Voltage” section in the MIC261201 datasheet for more information. July 2011 M9999-071511-A Micrel, Inc. MIC261201 12A Evaluation Board Evaluation Board Performance EFFICIENCY % 100 95 90 85 80 75 70 65 60 55 50 0 Efficiency VIN = 5V vs. Output Current VIN = 5V 3.3V 2.5V 1.8V 1.5V 1.2V 1.0V 0.9V 0.8V OUTPUT CURRENT A EFFICIENCY % 100 95 90 85 80 75 70 65 60 55 50 0 Efficiency VIN = 12V vs. Output Current 5.0V 3.3V 2.5V 1.8V 1.5V 1.2V 1.0V 0.9V 0.8V VIN = 12V OUTPUT CURRENT A EFFICIENCY % 95 90 85 80 75 70 65 60 55 50 Efficiency VIN = 24V vs. Output Current

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MIC261201 Evaluation Board
28V, 12A Hyper Speed Control

Synchronous DC/DC Buck Regulator

SuperSwitcher II

The MIC261201 DC-DC regulator operates over an input supply range of 4.5V to 28V, and provides a regulated output at up to 12A of output current. The output voltage is adjustable to 0.8V, with a typical accuracy of ±1% the device operates at a switching frequency of 600kHz. The switching frequency remains fairly constant, with changes in input voltage and output load.

Micrel’s Hyper Speed Control architecture allows for ultra-fast transient response, while reducing the output capacitance and it also makes High VIN / Low VOUT operation possible. The MIC261201 utilizes an adaptive TON ripple control architecture. An undervoltage lockout feature is provided to ensure proper operation under power-sag conditions. It also includes an internal soft-start feature to reduce the inrush current. Foldback current limit and “hiccup” mode short-circuit protection, as well as thermal shutdown ensures protection of the IC during fault conditions.

Note This evaluation board is for 12A applications.

The datasheet and other supporting documentation can be found on Micrel’s web site at:

Requirements

The MIC261201 provides a 5V regulated output for input voltage VIN ranging from 5.5V to 28V. When VIN < 5.5V, VDD should be tied to PVIN pins to bypass the internal linear regulator by a jumper. The output load can either be active or passive.

Precautions

Getting Started

Connect an external supply to the VIN terminal. Apply the desired input voltage to the VIN and ground terminals of the evaluation board, paying careful attention to polarity and supply voltage. An ammeter may be placed between the input supply and the VIN terminal to the evaluation board. Make sure that the supply voltage is monitored at the VIN terminal. The ammeter and/or power lead resistance can reduce the voltage supplied to the input.

Connect the load to the VOUT and ground terminals. The load can be either passive resistive or active as in an electronic load . An ammeter can be placed between the load and the VOUT terminal. Ensure that the output voltage is monitored at the VOUT terminal. VOUT can be set to 0.9V, 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V, or 5.0V by a jumper. If a different voltage is needed, adjust it by changing the feedback resistors. See “Output Voltage” section.

Enable the MIC261201. The EN pin is provided on the evaluation board. The output of the MIC261201 turns on when VDD exceeds the UVLO threshold. Turn off he output of the MIC261201 by shorting the EN pin to ground. A connection on the board provides easy access to the enable pin.
Ordering Information

Part Number MIC261201YJL EV
12 A HSC DC-DC Regulator Evaluation Board

Hyper Speed Control is a trademark of Micrel, Inc MLF and MicroLead Frame are registered trademarks of Amkor Technology, Inc.

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

July 2011

M9999-071511-A

Micrel, Inc.

Output Voltage

The output voltage on the MIC261201 evaluation board is adjustable. Set it by adjusting the feedback resistors R4 and one of R5, R6, R7, R8, R9, R10, R11, or R12 and can be calculated as follows as an example:

VOUT

VREF

R4 R7
where VREF = 0.8V.

The output voltage above is set at the factory for 1.2V output, but it can easily be changed by moving the jumper to a respective position to get an indicated voltage on the board. If a desired voltage is not shown on the board, modify it by removing R4 and R7

MIC261201 12A Evaluation Board
and replacing them with the values that yield the desired output voltage. Once R4 is selected, R7 can be calculated using:

R7 = R4 x VREF VOUT − VREF

For VREF = 0.8V:

R7 = R4 x 0.8V VOUT − 0.8V

The output voltage should not be set to exceed 5V due to the 6.3V rating of the output capacitor and on-line regulation limitation. Please refer to the “Setting Output Voltage” section in the MIC261201 datasheet for more information.

July 2011

M9999-071511-A

Micrel, Inc.

MIC261201 12A Evaluation Board

Evaluation Board Performance

EFFICIENCY %
100 95 90 85 80 75 70 65 60 55 50 0

Efficiency VIN = 5V vs. Output Current

VIN = 5V
3.3V 2.5V 1.8V 1.5V 1.2V 1.0V 0.9V 0.8V

OUTPUT CURRENT A

EFFICIENCY %
100 95 90 85 80 75 70 65 60 55 50 0

Efficiency VIN = 12V vs. Output Current
5.0V 3.3V 2.5V 1.8V 1.5V 1.2V 1.0V 0.9V 0.8V

VIN = 12V

OUTPUT CURRENT A

EFFICIENCY %
95 90 85 80 75 70 65 60 55 50

Efficiency VIN = 24V vs. Output Current

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Datasheet ID: MIC261201YJL-EV 647896