Microchip MIC2295YML Handleiding

Microchip Niet gecategoriseerd MIC2295YML

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MIC2295 MLF ® Evaluation Board
1.2MHz PWM Step-Up Converter
MLF is a registered trademark 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 2009
M9999-020509-B
General Description
The Micrel MIC2295 is a small 1.2MHz constant
frequency PWM DC/DC step-up switching regulator.
The MIC2295 is available in either a thin SOT-23 or a
2mm x 2mm MLF ® package. High power densities, in
a very small size, are achieved using its internal
34V/1.2A switch.
Requirements
The MIC2295 evaluation board requires an input
power source that is able to deliver greater than 1.2A
at 2.5V.
Precautions
The evaluation board does not have reverse polarity
protection. Applying a negative voltage to the VIN
terminal may damage the device.
The MIC2295 evaluation board is tailored for a Li-ion
range input supply voltage. The MIC2295 evaluation
board should not exceed 6.3V on the input unless the
standard input capacitor is replaced with a higher
rated input capacitor.
Getting Started
1. Connect an external supply to V IN. Apply
desired input voltage to the V IN (J1) and
ground (J2 and J5) terminals of the evaluation
board, paying careful attention to polarity and
supply voltage (2.5V≤V IN≤6.3V). 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. A 10uF input capacitor is
used on the evaluation board to help
compensate for long cables used in most lab
settings.
2. Connect the load to the V OUT (J4) and
ground terminals. The load can be either
passive (resistor) or active (electronic load).
An ammeter can be placed between the load
and the V OUT terminal. The default output
voltage is set to 12V. This can be adjusted by
changing the feedback resistors.
3. Enabling the MIC2295. Apply a 1.5V or
greater voltage to the enable (J3) terminal.
Ordering Information
Part Number Description
MIC2295YML EV 1.2MHz PWM Step-Up Converter
Micrel, Inc. MIC2295 Evaluation Board
February 2009 M9999-020509-B
(408) 955-1690
2
Output Voltage
The output voltage on the MIC2295 evaluation board
is adjustable. The output voltage is controlled by the
feedback resistors (R1 and R2) and can be calculated
as follows:
R1
R2
VOUT = 1.24V + 1
( )
The evaluation board is initially adjusted to 12V, but
can easily be modified by removing R1 and replacing
it with the value that yields the desired output voltage.
(Caution: Do not power up the MIC2295 SOT-23
version with R1 removed. The SOT-23 version does
not have over-voltage protection thus the output
voltage will steadily increase until the device self-
destructs).
VOUT
1.24V
Ensure the output voltage selected does not exceed
the 25V rating of the output capacitor. When output
voltages greater than 25V are desired, the output
capacitor should be replaced with one rated greater
than the maximum output voltage. The following
chart defines the minimum output capacitor value
recommended for different output voltages.
Output Voltage Recommended Output Capacitor
<6V 22uF
<16V 10uF
<34V 4.7uF
MIC2295 Schematic
Micrel, Inc. MIC2295 Evaluation Board
February 2009 M9999-020509-B
(408) 955-1690
3
Bill of Materials
Item Part Number Manufacturer Description Qty.
08056D106MAT AVX(1) 10µF 6.3V 0805 X5R Ceramic Capacitor 1
C1608X5R0J106K TDK
(2) 10µF 6.3V 0603 X5R Ceramic Capacitor 1
C1
GRM21BR61A106KE19L Murata (3) 10µF 6.3V 0805 X5R Ceramic Capacitor 1
1206YD475MAT AVX(1) 1
C3216X5R1C475K TDK
(2) 1
C2
GRM31CR61C475KA12L Murata (3)
4.7µF 25V 1206 X5R Ceramic Capacitor
1
MBRX140 MCC (4) 1
D1
1N5819HW Diodes Inc (6)
1A 40V Schottky Diode
1
LQH43CN100K03 Murata (3) 10µH 650mA Inductor 1
L1
VLF4012AT-100MR79 TDK
(2) 10µH 800mA Inductor 1
R1 CRCW06034322FRT1 Vishay (6) 43.2kΩ 0603 Resistor 1
R2 CRCW06034991FRT1 Vishay (6) 4.99kΩ 0603 Resistor 1
R3 CRCW06031002FRT1 Vishay (6) 10kΩ 0603 Resistor 1
U1 MIC2295YML Micrel, Inc. (7) 1.2MHz PWM Step-Up Converter 1
Notes:
1. AVX: www.avx.com.
2. TDK: www.tdk.com.
3. Murata: www.murata.com.
4. Micro Commercial Components (MCC): www.mccsemi.com.
5. Diodes Inc: www.diodes.com.
6. Vishay: www.vishay.com.
7. .: . Micrel, Inc www.micrel.com

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: MIC2295YML

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