MIC26901YJL EV Micrel, MIC26901YJL EV Datasheet

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MIC26901YJL EV

Manufacturer Part Number
MIC26901YJL EV
Description
Power Management IC Development Tools 28V/9A DC-DC Buck Regulator w/ HSC - Evaluation Board
Manufacturer
Micrel
Type
DC/DC Converters, Regulators & Controllersr
Datasheet

Specifications of MIC26901YJL EV

Product
Evaluation Boards
Tool Is For Evaluation Of
MIC26901
Input Voltage
4.5 V to 28 V
Output Voltage
0.9 V, 1 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V
Description/function
Evaluation Board
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 40 C
Output Current
9 A
For Use With
MIC26901
General Description
The MIC26901 DC-DC regulator operates over an input
supply range of 4.5V to 28V, and provides a regulated output
at up to 9A of output current. The output voltage is adjustable
to 0.8V with a typical accuracy of ±1% and 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
fast
capacitance. It also makes (High V
possible. The MIC26901 utilizes an adaptive T
control architecture. An undervoltage lockout feature is
provided to ensure proper operation under power-sag
conditions. An internal soft-start feature is provided to reduce
the inrush current. Foldback current limit and “hiccup” mode
short-circuit protection and thermal shutdown ensures
protection of the IC during fault conditions.
Note: This evaluation board is for 9A applications.
A datasheet and supporting documentation can be found
on Micrel’s web site at: www.micrel.com.
Requirements
The MIC26901 provides a 5V regulated output for input
voltage V
V
linear regulator by a jumper. The output load can either be
an active or passive load.
Precautions
The evaluation board does not have reverse polarity
protection. Applying a negative voltage to the V
may damage the device. In addition, the maximum V
operating voltage of the MIC26901 evaluation board is
28V. Exceeding 29V on VIN could damage the device.
Hyper Speed Control is a trademark of Micrel, Inc
MLF and MicroLead Frame is a registered trademark of Amkor Technology, Inc.
July 2011
DD
should be tied to PVIN pins to bypass the internal
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (
transient
IN,
ranging from 5.5V to 28V. When V
response,
TM
while
architecture allows for ultra-
IN
reducing
)/(Low V
OUT
the
) operation
IN
IN
ON
terminal
< 5.5V,
output
ripple
IN
Getting Started
1. Connect an external supply to the VIN terminal. Apply
2. Connect the load to the V
3. Enable the MIC26901. The EN pin is provided on the
.
408
Ordering Information
Part Number
MIC26901YJL EV
Synchronous DC/DC Buck Regulator
) 944-0800 • fax + 1 (408) 474-1000 •
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. Ensure 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.
The load can be either passive (resistive) or active (as
in an electronic load). An ammeter can be placed
between the load and the V
the output voltage is monitored at the V
V
3.3V, or 5.0V by a jumper. If a different voltage is
needed, it can be adjusted by changing the feedback
resistors. See “Output Voltage” section.
evaluation board. The output of the MIC26901 turns on
when V
output of the MIC26901 by shorting the EN pin to
ground. A connection on the board provides easy
access to the enable pin.
MIC26901 Evaluation Board
OUT
28V, 9A Hyper Speed Control™
can be set to 0.9V, 1.0V, 1.2V, 1.5V, 1.8V, 2.5V,
DD
exceeds the UVLO threshold. Turn off the
SuperSwitcher II™
HSC 9A DC-DC Regulator
OUT
Evaluation Board
OUT
http://www.micrel.com
and ground terminals.
Description
terminal. Ensure that
M9999-071511-A
OUT
terminal.

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MIC26901YJL EV Summary of contents

Page 1

... The output of the MIC26901 turns on when V output of the MIC26901 by shorting the EN pin to ground. A connection on the board provides easy access to the enable pin. < 5.5V, IN Ordering Information Part Number MIC26901YJL EV terminal 408 ) 944-0800 • fax + 1 (408) 474-1000 • 28V, 9A Hyper Speed Control™ SuperSwitcher II™ ...

Page 2

... Micrel, Inc. Output Voltage The output voltage on the MIC26901 evaluation board is adjustable set 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 × REF OUT R7 where V = 0.8V. REF The output voltage above is set at the factory for a 1.2V ...

Page 3

... Micrel, Inc. Evaluation Board Performance Efficiency (V = 5V) IN vs. Output Current 100 OUTPUT CURRENT (A) Thermal Derating* vs. Ambient Temperature 1.8, 2.5, 3.3V 2 OUT 0 -50 - 100 AMBIENT TEMPERATURE (°C) Die Temperature* : The temperature measurement was taken at the hottest point on the MIC26901 case mounted square inch 4 layer, 0.62”, FR-4 PCB with 2oz finish copper weight per layer, see Thermal Measurement section ...

Page 4

... Micrel, Inc. Evaluation Board Schematic July 2011 Schematic of MIC26901 Evaluation Board (J11, R13, R15 are for testing purposes) 4 MIC26901 9A Evaluation Board M9999-071511-A ...

Page 5

... Micrel, Inc. Bill of Materials Item Part Number C1 Open 12105C475KAZ2A C2, C3 GRM32ER71H475KA88L C3225X7R1H475K C13, C15 Open 12106D107MAT2A C4, C5 GRM32ER60J107ME20L C3225X5R0J107M 06035C104KAT2A C6, C7, C10 GRM188R71H104KA93D C1608X7R1H104K 0603ZC105KAT2A C8 GRM188R71A105KA61D C1608X7R1A105K 0603ZD225KAT2A C9 GRM188R61A225KE34D C1608X5R1A225K 06035C472KAZ2A C12 GRM188R71H472K C1608X7R1H472K C14 B41851F7227M C11, C16 Open SD103AWS D1 SD103AWS-7 ...

Page 6

... Micrel, Inc.: www.micrel.com July 2011 Manufacturer Description (7) Vishay Dale 0Ω Resistor, Size 0603, 5% (7) Vishay Dale 49.9Ω Resistor, Size 0603, 1% (7) Vishay Dale 1.21Ω Resistor, Size 0603, 1% (9) Micrel. Inc. 28V/9A Synchronous Buck DC-DC Regulator 6 MIC26901 9A Evaluation Board Qty M9999-071511-A ...

Page 7

... Micrel, Inc. PCB Layout Recommendations July 2011 Top Layer Mid-Layer 1 (Ground Plane) 7 MIC26901 9A Evaluation Board M9999-071511-A ...

Page 8

... Micrel, Inc. PCB Layout Recommendations (Continued) July 2011 Mid-Layer 2 Bottom Layer 8 MIC26901 9A Evaluation Board M9999-071511-A ...

Page 9

... A Purchaser’s use or sale of Micrel Products for use in life support appliances, devices or systems is a Purchaser’s own risk and Purchaser agrees to fully July 2011 indemnify Micrel for any damages resulting from such use or sale ...

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