Microchip MIC23450 Bedienungsanleitung
Microchip
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MIC23450
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MIC23450 Evaluation Board
3MHz, PWM, 2A Triple Buck Regulator
with HyperLight Load
®
and Power Good
HyperLight Load is a registered trademark of Micrel, Inc.
MLF and MicroLeadFrame are registered trademark 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 4, 2013
Revision 1.0
General Description
This board allows the customer to evaluate the
MIC23450, a fully-integrated, triple-output, 2A, 3MHz
switching regulator that features HyperLight Load
®
mode
and power good (PG) output indicators. The MIC23450
is highly efficient throughout the output current range,
drawing just 23µA of quiescent current for each channel
in operation. The tiny 5mm x 5mm MLF
®
package saves
board space and requires few external components. The
MIC23450 provides ±2.5% output voltage accuracy and
each channel responds typically in less than 10µs to a
load transient with as low as 5mV output voltage ripple.
Requirements
This board needs a single 40W bench power source,
adjustable from 2.7V to 5.5V. The loads can be either
active (electronic load) or passive (resistor), and must be
able to dissipate 20W. It is ideal, but not essential, to
have an oscilloscope available to view the circuit
waveforms. The simplest tests require two voltage
meters to measure input and output voltage. Efficiency
measurements for a single channel require two voltage
meters and two ammeters to prevent errors caused by
measurement inaccuracies.
Precautions
There is no reverse input protection on this board. Be
careful when connecting the input source to make sure
correct polarity is observed.
Getting Started
1. Connect an external supply to the V
IN
(J1)
terminal and GND (J3).
With the output of the power supply disabled, set its
voltage to the desired input test voltage (2.7V ≤ V
IN
≤
5.5V). An ammeter may be placed between the input
supply and the V
IN
(J1) terminal. Be sure to monitor
the supply voltage at the V
IN
(J1) terminal, as the
ammeter and/or power lead resistance can reduce
the voltage supplied to the device.
2. Connect a load to the V
OUT
terminals (J2, J5, J7)
and ground (J4, J6, J8) terminals.
The load can be either active passive (resistive) or
active (electronic load). An ammeter may be placed
between the loads and the output terminals. Make
sure the output voltage is monitored at V
OUT1,
V
OUT2
and
V
OUT3
(J2, J5 and J7) terminals. The board has
multiple 2-pin connectors (JP1, JP2 and JP3) to
allow for output voltage monitoring of V
OUT1
, V
OUT2
and V
OUT3
respectively.
3. Enable the Supply to MIC23450.
The MIC23450 evaluation board has a pull-up
resistor to V
IN
for each channel. By default, each
output voltage is enabled when the input supply of
>2.7V is applied. Each channel 1, 2 or 3 can be
disabled by applying a voltage below 0.4V to the EN
terminal J10, J12 or J14 respectively.
4. Power Good.
The board provides a power good test point (J9,
J11, and J13) to monitor the power good function for
each of the channels 1, 2, and 3 respectively. The
power good output goes high (V
OUT
) nominally 62µs
after the output voltage reaches 90% of its nominal
voltage.
Ordering Information
Part Number Description
MIC23450-AAAYML EV
3MHz, PWM,
2A Triple Buck
Regulator Evaluation Board
Produktspezifikationen
| Marke: | Microchip |
| Kategorie: | Nicht kategorisiert |
| Modell: | MIC23450 |
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