TM
EV2307DN-00A – 3A, 23V, 340KHz SYNCHRONOUS STEP-DOWN CONVERTER
EVALUATION BOARD – INITIAL RELEASE
QUICK START GUIDE
1. Connect the positive terminal of the load to the VOUT pins and the negative terminal to the
GND pins.
2. Preset the power supply output to 4.75V to 23V and turn it off.
3. Connect the positive terminal of the power supply output to the VIN pin and the negative
terminal to the GND pin.
4. Turn on the power supply. The MP2307 will automatically startup.
5. To use the Enable function, apply a digital input to the EN pin. Drive EN higher than 2.5V to turn
on the regulator or less than 0.7V to turn it off.
6. An under voltage lockout (UVLO) function can be implemented by the addition of a resistor
divider (R4 and R5). The EN threshold is 2.5V, so the VIN UVLO threshold is:
⎜
1
+
⎝
⎛
R4
⎞
⎟ ×
2.5 V
.
R5
⎠
RECOMMENDED COMPONENTS FOR STANDARD OUTPUT VOLTAGES
The output voltage of this board is set to 3.3V. This board is laid out to accommodate most commonly
used inductors and output capacitors and to also be programmed for most standard output voltages.
The following table lists recommended components for some standard output voltages. Listed
compensation components (R2, C3) values are based on the output capacitor installed on this board.
For other capacitors, refer to the Application Information section of the MP2307 datasheet.
VOUT
1.8V
2.5V
3.3V
5V
12V
R1
9.53kΩ
16.9kΩ
26.1kΩ
44.2Ω
121kΩ
R2
4.42kΩ
4.75kΩ
5.6kΩ
7.5kΩ
10kΩ
C3
6.8nF
4.7nF
3.3nF
3.3nF
1.2nF
L1
4.7µH
4.7µH to 6.8µH
6.8µH to 10µH
10µH to 15µH
15µH to 22µH
NOTICE:
The information in this document is subject to change without notice. Please contact MPS for current specifications.
Users should warrant and guarantee that third party Intellectual Property rights are not infringed upon when integrating MPS
products into any application. MPS will not assume any legal responsibility for any said applications.
EV2307DN-00A Rev. 1.1f
9/14/2005
www.MonolithicPower.com
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.
© 2005 MPS. All Rights Reserved.
4
MPS [ MONOLITHIC POWER SYSTEMS ]
