Micrel MIC45208 Manual

General Description

Micrel's MIC45208 is a synchronous step-down regulator
module, featuring a unique adaptive ON-time control
architecture. The module incorporates a DC-to-DC
controller, power MOSFETs, bootstrap diode, bootstrap
capacitor, and an inductor in a single package; simplifying
the design and layout process for the end user.
This highly-integrated solution expedites system design
and improves product
MOSFETs and inductor are optimized to achieve high
efficiency at a low output voltage. The fully optimized
design can deliver up to 10A current under a wide input
voltage range of 4.5V to 26V, without requiring additional
cooling.
The MIC45208-1 uses Micrel's HyperLight Load
MIC45208-2 uses Micrel's
architecture which enables
response, allowing for a reduction of output capacitance.
The MIC45208 offers 1% output accuracy that can be
adjusted from 0.8V to 5.5V with two external resistors.
The basic parameters of the evaluation board are:
•
Input: 4.5V to 26V
•
Output: 0.8V to 5V at 10A
•
600kHz Switching Frequency
(Adjustable 200kHz to 600kHz)
Datasheets and support documentation are available on
Micrel's web site at: www.micrel.com.
Requirements
The MIC45208-1 and MIC45208-2 evaluation board only
requires a single power supply with at least 10A current
capability. No external linear regulator is required to power
the internal biasing of the IC because the MIC45208 has
an internal PVDD LDO. In applications where VIN < +5.5V,
PVDD should be tied to VIN to bypass the internal linear
regulator. The output load can either be a passive or an
active load.
Precautions
The MIC45208 evaluation board does not have reverse
polarity protection. Applying a negative voltage to the VIN
and GND terminals can damage the device. The maximum
VIN of the board is rated at 30V. Exceeding 30V on the
VIN could damage the device.
HyperLight Load is a registered trademark and Hyper Speed Control is a trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 •
August 19, 2015
time-to-market. The
®
Hyper Speed Control™
ultra-fast load transient
MIC45208 Evaluation Board
26V/10A DC-to-DC Power Module

Getting Started

1. VIN Supply
Connect a power supply to the VIN and GND
terminals, paying careful attention to the polarity and
the supply range (4.5V < VIN < 26V). Monitor IIN with
a current meter and monitor input voltage at VIN and
GND terminals with a voltmeter. Do not apply power
until Step 4.
internal
2. Connect Load and Monitor Output
Connect a load to the VOUT and GND terminals. The
load can be either a passive (resistive) or an active (as
in an electronic load) type. A current meter may be
placed between the VOUT terminal and load to
monitor the output current. Ensure the output voltage
(HLL)
is monitored at the VOUT terminal.
3. Enable Input
The EN pin has an on-board 100kΩ pull-up resistor
(R10) to VIN, which allows the output to be turned on
when PVDD exceeds its UVLO threshold. An EN
connector is provided on the evaluation board for
users to easily access the enable feature. Applying an
external logic signal on the EN pin to pull it low or
using a jumper to short the EN pin to GND will shut off
the output of the MIC45208 evaluation board.
4. Turn Power On
Turn on the VIN supply and verify that the output
voltage is regulated to 5V.

Ordering Information

Part Number
MIC45208-1YMP EV
MIC45208-2YMP EV
Description
MIC45208-1 Evaluation Board
MIC45208-2 Evaluation Board
http://www.micrel.com
Revision 2.0