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TM
EV2309DS-00A
1A, 23V, 340KHz Synchronous Step-Down Converter Evaluation Board
The Future of Analog IC Technology
TM
GENERAL DESCRIPTION
The EV2309DS-00A is an evaluation board for the MP2309, a monolithic synchronous buck regulator. The device integrates 140m MOSFETS that provide 1A continuous load current over a wide operating input voltage of 4.75V to 23V. Current mode control provides fast transient response and cycle-by-cycle current limit. An adjustable soft-start prevents inrush current at turn-on. In shutdown mode, the supply current is only 1A. This device, available in an 8-pin SOIC package, provides a very compact system solution with minimal reliance on external components.
FEATURES
* * * * * * * * * * * * Up to 1A Output Current Wide 4.75V to 23V Operating Input Range Monolithic Synchronous Buck with 140m High-Side and Low-Side FETs Fixed 340KHz Frequency All Ceramic Input and Output Capacitors Programmable Soft-Start Programmable Input Under Voltage Lockout Distributed Power Systems Networking Systems FPGA, DSP, ASIC Power Systems Green Electronics/ Appliances Notebook Computers
APPLICATIONS
ELECTRICAL SPECIFICATIONS
Parameter Supply Voltage Output Voltage Output Current Symbol VIN VOUT IOUT Value 4.75 to 23 3.3 0 to 1 Units V V A
"MPS" and "The Future of Analog IC Technology" are Trademarks of Monolithic Power Systems, Inc.
EV2309DS-00A EVALUATION BOARD
Efficiency vs Load Current
100 90
EFFICIENCY (%)
80 70 60 50 40 30 20 VIN = 23V
VIN = 5V VIN = 12V
(L x W x H) 2.0" x 1.5" x 0.5" (5.0cm x 3.8cm x 1.2cm) Board Number EV2309DS-00A MPS IC Number MP2309
0
0.25 0.5 0.75 LOAD CURRENT (A)
1.0
MP2309-EC01
EV2309DS-00A Rev. 1.3 9/29/2005
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved.
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TM
EV2309DS-00A - 1A, 23V, 340KHz SYNCHRONOUS STEP-DOWN EV BOARD
EVALUATION BOARD SCHEMATIC
VIN C8 NS
2
C1 10nF
GND
U1
1 BS 3 SW
EN
7
IN EN
C7 NS
R5 NS
8
MP2309
SS GND 4 FB COMP 6 5
D1 B130LAW
(optional)
VOUT 3.3V / 1A C5 NS GND
SS
C4 NS
C3 3.3nF
EV2309_S01
EV2309DS-00A BILL OF MATERIALS
Qty 1 1 1 4 1 1 1 1 1 1 1 1 1 1 Ref C1 C2 C3 C4, C5, C7, C8 C6 C9 D1 L1 R1 R2 R3 R4 R5 U1 10H Value 10nF 10F 3.3nF NS 0.1F 22F Description Ceramic Capacitor, 50V, X7R Ceramic Capacitor, 25V, X7R Ceramic Capacitor, 50V, X7R Not Stuffed Ceramic Capacitor, 50V, X7R Ceramic Capacitor, 16V, X5R Diode Schottky, 30V, 1A Inductor, 1.5A TDK: C2012X7R1H104K TDK: 1210 C3225X5R1C226M Diodes Inc.: SOD-123 B130LAW Sumida: SMD CDRH6D26NP-100NB Panasonic: 0805 ERJ-6ENF2612V Panasonic: 0805 ERJ-6GEYJ752V Panasonic: 0805 ERJ-6ENF1002V Panasonic: 0805 ERJ-6GEYJ104V 0805 SO8 MPS: MP2309DS Digikey: 445-1349-1-ND Digikey: 445-1436-1-ND Digikey: B130LAWDICT-ND Package 0805 1210 0805 Manufacturer: Manufacturer P/N Panasonic: ECJ-2VB1H223K TDK: C3225X7R1E106M Panasonic: ECJ-2VB1H332K Distributor: Distributor P/N Digikey: PCC223BGCT-ND Digikey: 445-1434-1-ND Digikey: PCC332BNCT-ND
26.1k Resistor, 1% 7.5k 10k 100k NS Resistor, 5% Resistor, 1% Resistor, 5% Not Stuffed Step-Down Converter, 1A, 340KHz
Digikey: P26.1KCCT-ND Digikey: P7.5KACT-ND Digikey: P10.0KCCT-ND Digikey: P100KACT-ND
EV2309DS-00A Rev. 1.3 9/29/2005
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved.
2
TM
EV2309DS-00A - 1A, 23V, 340KHz SYNCHRONOUS STEP-DOWN EV BOARD
PRINTED CIRCUIT BOARD LAYOUT
Figure 1--Top Silk Layer
Figure 2--Top Layer
Figure 3--Bottom Layer
EV2309DS-00A Rev. 1.3 9/29/2005
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved.
3
TM
EV2309DS-00A - 1A, 23V, 340KHz SYNCHRONOUS STEP-DOWN EV BOARD
QUICK START GUIDE
1. Connect the positive terminal of the load to VOUT pins, and the negative terminal of the load to GND pins. 2. Preset 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 VIN pin, and the negative terminal of the power supply output to GND pin. 4. Turn power supply on and the MP2309 will automatically startup. 5. To use Enable function, apply a digital input to EN pin. Drive EN higher than 2.5V to turn on the regulator, drive EN 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 VIN UVLO threshold is: 1 +
R4 x 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 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.
VOUT 1.8V 2.5V 3.3V 5V 12V R1 9.53k 16.9k 26.1k 44.2 121k R2 4.99k 5.6k 7.5k 10k 25.5k C3 4.7nF 4.7nF 3.3nF 3.3nF 2.2nF L1 4.7H 4.7H to 6.8H 6.8H to 10H 10H to 15H 33H to 47H
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.
EV2309DS-00A Rev. 1.3 9/29/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved.
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