MIC2203 Micrel Semiconductor, MIC2203 Datasheet

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MIC2203

Manufacturer Part Number
MIC2203
Description
High Efficiency 1MHz Synchronous Buck Regulator
Manufacturer
Micrel Semiconductor
Datasheet

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General Description
The MIC2203 is an ultra-high efficiency, high
frequency synchronous buck (step-down) switching
regulator.
obtainable for a wide variety of applications. In
addition, the MIC2203 has a logic compatible-enable
function, which provides near “zero” OFF mode
quiescent
applications.
The MIC2203 operates from 2.3V to 5.5V input and
features internal power MOSFETs that can supply up
to 300mA output current. It can operate with a
maximum duty cycle of 100% for low-dropout
conditions and regulate output voltages down to 0.5V.
The MIC2203 is a constant frequency pulse width
modulation (PWM) buck converter that maintains high
efficiency even at light load currents. By maintaining a
constant PWM frequency, RF interference is kept
down to a minimum.
The MIC2203 has a SYNC_IN pin and SYNC_OUT
function, which can be used to synchronize the
MIC2203 to an external clock or used in combination
with other MIC2203s to daisy chain multiple
converters to a single clock.
Requirements
The MIC2203 evaluation board requires an input
power source that is able to deliver greater than 1A at
2.3V.
March 2005
Micrel, Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel + 1 (408) 944-0800 • fax 1 (408) 474-1000 • http://www.micrel.com
Efficiencies
current
for
above
power
90%
critical
are
battery
easily
High Efficiency 1MHz Buck Converter
Precautions
The evaluation board does not have reverse polarity
protection. Applying a negative voltage to the V
terminal may damage the device.
In addition, the maximum operating voltage of the
MIC2203 evaluation board is 5.5V. Exceeding 6V on
the input could damage the device.
Getting Started
MIC2203 Evaluation Board
1.
2. Connect the load to the V
3. Enabling the MIC2203. If an R5 resistor is
Connect an external supply to V
desired input voltage to the V
ground (Gnd) terminals of the evaluation
board, paying careful attention to polarity
and supply voltage (2.3V≤V
ammeter may be placed between the input
supply and the V
board. Ensure that the supply voltage is
monitored at the V
and/or power lead resistance can reduce the
voltage supplied to the input.
terminals. The load can be either passive
(resistor) or active (electronic load). An
ammeter can be placed between the load
and the V
output voltage is set to 1.8V. This can be
adjusted by changing the feedback resistors.
See “Output Voltage.
on the evaluation board, a 2.3V or greater
voltage must be applied to the VIN terminal
to enable the device. Conversely, if an R5
resistor is not on the evaluation board, a
1.3V or greater voltage must be applied to
the enable (En) terminal to enable the
device.
OUT
(+Vo) terminal. The default
IN
IN
terminal to the evaluation
terminal. The ammeter
OUT
IN
≤5.5V). An
IN
and ground
(+Vin) and
(408) 955-1690
M9999-032305
IN
. Apply
IN

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MIC2203 Summary of contents

Page 1

... OUT output voltage is set to 1.8V. This can be adjusted by changing the feedback resistors. See “Output Voltage. 3. Enabling the MIC2203 resistor is on the evaluation board, a 2.3V or greater voltage must be applied to the VIN terminal to enable the device. Conversely resistor is not on the evaluation board ...

Page 2

... SYNC_OUT is an open collector output that tracks the internal oscillator. A 10kΩ pull-up resistor is required to use the SYNC_OUT function. The R3 location is reserved for this option. Applying the SYNC_OUT signal to the SYNC_IN pin of another MIC2203 converter allows both devices to run at the same frequency. 2 MIC2203 Evaluation Board ) to ...

Page 3

... Micrel, Inc 10µF/6.3V OPEN SYNC_OUT J4 SYNC_IN J2 GND Bill of Material MIC2203 Evaluation Board Ref Des Part Number GRM21BR60J106KE19L C2012X5R0J106K C1 VJ0805G106KXQCW1BC 08056D106KAT C2012X5R1A225K 0603D225KAT C2 VJ08055G225KXQCW1BC GRM185R60J225KE26D C3 VJ0603Y103KXXAT LQH32CN100K33 L1 VLF3010AT-100MR49 SD3812-100 R1 CRCW06031002FRT1 R2 CRCW06033921FRT1 R3 OPEN R4 CRCW06031002FRT1 R5 CRCW06031002FRT1 U1 MIC2203BMM Notes: 1. AVX: www.avx.com 2. Murata: www ...

Page 4

... Micrel, Inc. Printed Circuit Board Layouts Figure 1a. Top Silkscreen Figure 1c. Bottom Silkscreen March 2005 MIC2203 Evaluation Board Figure 1b. Top Layer Figure 1d. Bottom Layer 4 M9999-032305 (408) 955-1690 ...

Page 5

... 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 indemnify Micrel for any March 2005 the customer. damages resulting from such use or sale. © 2004 Micrel Incorporated 5 MIC2203 Evaluation Board M9999-032305 (408) 955-1690 ...

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