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TM
EV2364DF-00A
1.5A, 23V, 1.4MHz Dual Step-Down Converter Evaluation Board
The Future of Analog IC Technology
TM
GENERAL DESCRIPTION
The EV2364DF-00A is an evaluation board for the MP2364, a dual output, monolithic step-down switch mode converter with built-in internal power MOSFETs. It achieves 1.5A continuous output current for each output over a wide input supply range with excellent load and line regulation. Current mode operation provides fast transient response and eases loop stabilization. Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. In shutdown mode the regulator draws 40A of supply current. The MP2364 requires a minimum number of readily available standard external components.
FEATURES
* * * * * * * * * * * * * 1.5A Current for Each Output Ceramic Input and Output Capacitors Up to 90% Efficiency 40A Shutdown Mode Fixed 1.4MHz Frequency Wide 4.75V to 23V Operating Input Range Programmable Under Voltage Lockout Programmable Soft-Start Distributed Power Systems I/O and Core Supplies DSL Modems Set Top Boxes Cable Modems
APPLICATIONS
ELECTRICAL SPECIFICATIONS
Parameter Input Voltage Output Voltage A Output Voltage B Symbol VIN VOUTA VOUTB Value 4.75 to 23 3.3 2.5 Units V V V
"MPS" and "The Future of Analog IC Technology" are Trademarks of Monolithic Power Systems, Inc.
EV2364DF-00A EVALUATION BOARD
Efficiency vs Load Current
100 90 VOUT=3.3V VOUT=5V
EFFICIENCY (%)
80 70 60
VOUT=2.5V
(L x W x H) 2.2" x 1.6" x 0.4" (5.5cm x 4.1cm x 1.0cm) Board Number EV2364DF-00A MPS IC Number MP2364DF
50
0
0.5 1.0 LOAD CURRENT (A)
1.5
MP2364_EC01
EV2364DF-00A Rev. 1.2 10/6/2005
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved.
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TM
EV2364DF-00A - 1.5A, 23V, 1.4MHz DUAL STEP-DOWN CONVERTER EV BOARD
EVALUATION BOARD SCHEMATIC
VIN 5.5V to 23V GND
D1 MBR0520 OPTIONAL 5V INPUT ONLY
SSA NC1 BSA INA SWA
ENA C8 2.2nF
D4 MBR0520 OPTIONAL 5V INPUT ONLY
ENA COMPA FBA
VOUTA 3.3V @ 1.5A GND C4 NS
U1
SGB PGB SWB INB NC2 BSB SSB
D2 B230A
PGA SGA FBB
MP2364
C7 10nF
D3 B230A
C10 NS
VOUTB 2.5V @ 1.5A GND
COMPB ENB
C5 3.3nF
ENB
MP2364_S01
EV2364DF-00A BILL OF MATERIALS
Qty 2 2 1 1 2 2 2 2 2 2 1 1 3 Ref D1, D4 D2, D3 C8 C5 C2, C7 2.2nF 3.3nF 10nF Value Description Schottky Diode, 20V, 0.5A, SOD123 Manufacturer Part No. Distributor Part No. Digikey: MBR0520LT1OSCT-ND Digikey: B230ADICT-ND Digikey: 445-1309-1-ND Digikey: PCC1778CT-ND Digikey: 445-1311-1-ND Digikey: 445-1357-1-ND Digikey: 445-1434-1-ND Digikey: 445-1404-1-ND ON Semiconductor: MBR0520LT1 Diodes Inc: Schottky Diode, 30V, 2A, SMA B230A-13 TDK: Ceramic Capacitor, 50V, 0603, X7R C1608X7R1H222K Panasonic: Ceramic Capacitor, 50V, 0603, X7R ECJ-1VB1H332K TDK: Ceramic Capacitor, 50V, 0603, X7R C1608X7R1H103K TDK: Ceramic Capacitor, 16V, 0805, X7R C2012X7R1C474K TDK: Ceramic Capacitor, 25V, 1210, X7R C3225X7R1E106M TDK: Ceramic Capacitor, 6.3V, 1210, X5R C3225X5R0J226M Do Not Stuff Sumida: Inductor, 2.8A, SMD, Unshielded CDRH6D28 Panasonic: Resistor, 0603, 1% ERJ-3EKF2552V Panasonic: Resistor, 0603, 5% ERJ-3GEYJ752V Panasonic: Resistor, 0603, 1% ERJ-3EKF1002V
C1, C6 0.47F C11, C12 C3, C9 C4, C10 L1, L2 R1 R2 R3, R5, R6 5H 25.5k 7.5k 10k 10F 22F
Digikey: P25.5KHCT-ND Digikey: P7.5KGCT-ND Digikey: P10.0KHCT-ND
EV2364DF-00A Rev. 1.2 10/6/2005
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved.
2
TM
EV2364DF-00A - 1.5A, 23V, 1.4MHz DUAL STEP-DOWN CONVERTER EV BOARD
EV2364DF-00A BILL OF MATERIALS (continued)
Qty 1 1 Ref R4 Value Description 16.9k Resistor, 0603, 1% U1 DC/DC Converter, TSSOP20F Manufacturer Part No. Panasonic: ERJ-3EKF1692V MPS: MP2364DF Distributor Part No. Digikey: P16.9KHCT-ND
PRINTED CIRCUIT BOARD LAYOUT
Figure 1--Top Silk Layer
Figure 2--Top Layer
Figure 3--Bottom Layer
EV2364DF-00A Rev. 1.2 10/6/2005
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved.
3
TM
EV2364DF-00A - 1.5A, 23V, 1.4MHz DUAL STEP-DOWN CONVERTER EV BOARD
QUICK START GUIDE
The output voltages of this board are set to 3.3V (VOUTA) and 2.5V (VOUTB). The board layout accommodates most commonly used inductors and output capacitors. 1. Attach the positive and negative ends of the first load to the VOUTA and GND pins, respectively. If using both outputs, attach the positive and negative ends of the second load to the VOUTB and GND pins, respectively. 2. Preset the power supply output to 4.75V to 23V and turn off the power supply. 3. Connect the positive terminal of the power supply output to the VIN pin and the negative terminal of the power supply output to the GND pin. 4. Turn the power supply on. The MP2364 will automatically startup. 5. To use the Enable function, apply a digital input to EN pin. Drive EN higher than 2.5V to turn on the regulator and less than 0.7V to turn it off. 6. The Output Voltages VOUTA and VOUTB can be changed by varying R1 and R4, respectively. Calculate the new values by the following formulae:
V R1 = R6 x OUTA - 1 0.92 V R4 = R3 x OUTB - 1 0.92
Where R6 = 10k and R3 = 10k Example: For VOUTA = 3.3V:
R1 = 10k x ( 3. 3 - 1) = 25.9k 0.92
Therefore, use a 25.5k standard 1% value resistor.
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.
EV2364DF-00A Rev. 1.2 10/6/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved.
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