Microchip MIC22705YML Manual


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Side 1/9
MIC22705YML EV
Evaluation Board
1MHz, 7A Integrated Switch High-
Efficiency Synchronous Buck Regulator
MLF and MicroLeadFrame 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 • http://www.micrel.com
February 2011 M9999-020411-A
General Description
The Micrel MIC22705 is a high-efficiency, 7A, integrated
switch, synchronous buck (step-down) regulator. The
MIC22705 achieves more than 95% efficiency and
switches at 1MHz. The ultra-high speed control loop keeps
the output voltage within regulation even under the
extreme transient load swings commonly found in FPGAs
and low-voltage ASICs. The output voltage is pre-bias safe
and is adjustable down to 0.7V.
The MIC22705 offers a full range of sequencing and
tracking options. The Enable/Delay (EN/DLY) and Power
Good (PG) inputs allow versatile turn-on and turn-off
sequencing across multiple devices. The Ramp Control™
(RC) input allows start-up voltage tracking, either directly
or ratio-metrically.
The MIC22705 is available in a 24-pin 4mm x 4mm MLF®
with a junction operating range from –40° °C to +125 C.
Data sheets and support documentation are found on the
Micrel web site: www.micrel.com.
Requirements
The MIC22705YML EV requires a power supply of 2.9V to
5.5V, and a test load. Ensure that the power supply can
provide the wattage required for the chosen test load. The
load can be active (electronic load) or passive (resistor).
Additionally, monitor the Power Good output (PG) with a
multimeter or an oscilloscope if desired.
Precautions
There is no reverse input protection on this board. When
connecting supplies and signals ensure that correct
polarities are observed.
Getting Started
1. VIN Supplies
Connect the VIN supply (2.9V to 5.5V) across the PVIN and
PGND terminals. Monitor VIN at the PVIN and PGND
terminals with a voltmeter.
2. Enable/SHDN Inputs
The enable input EN is internally pulled up with a 1µA
current source. When external on/off control is desired,
install Q1 and R5, and connect a logic level control signal
to the SHDN input. When SHDN is high, the output is off,
and when SHDN is low, the output is on.
3. Monitor Outputs
Monitor the output VOUT with a scope or DVM connected
across the VOUT and PGND terminals.
4. Output Load
Connect a load across the VOUT and PGND terminals.
Use an active or passive load.
5. Turn On the Power
Turn on the power supply and verify that VOUT = 1.8V.
Ordering Information
Part Number Description
MIC22705YML EV Evaluation Board for the MIC22705YML


Produkt Specifikationer

Mærke: Microchip
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Model: MIC22705YML

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