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TM
EV2109DQ-00A
Dual 800mA, 6V, 1.2MHz Synchronous Step-Down Converter Evaluation Board
The Future of Analog IC Technology
TM
DESCRIPTION
The EV2109DQ-00A is the evaluation board for the MP2109. The MP2109 contains two independent 1.2MHz constant frequency, current mode, PWM step-down converters. Each converter integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. The MP2109 is ideal for powering portable equipment that runs from a single cell Lithium-Ion (Li+) battery. Each converter can supply 800mA of load current from a 2.5V to 6V input voltage. The output voltage can be regulated as low as 0.6V. It can also run at 100% duty cycle for low dropout applications.
FEATURES
* * * * * * * * * * Up to 95% Efficiency 800mA Load Current on Each Channel 2.5V to 6V Input Voltage Range Output Voltage as Low as 0.6V Cellular and Smart Phones Microprocessors and DSP Core Supplies PDAs MP3 Players Digital Still and Video Cameras Portable Instruments
APPLICATIONS
"MPS" and "The Future of Analog IC Technology" are Trademarks of Monolithic Power Systems, Inc.
ELECTRICAL SPECIFICATIONS
Parameter Input Voltage Output Voltage 1 Output Voltage 2 Load Max Symbol VIN1/IN2 VOUT1 VOUT2 IOUT1/OUT2 Value 2.5 to 6 1.8 1.2 800 Units V V V mA
EV2109DQ-00A EVALUATION BOARD
Efficiency vs Load Current
100 VOUT=1.8V 90
EFFICIENCY (%)
80 70 60
VOUT=1.2V
(L x W x H) 2.0" x 1.6" x 0.4" (5.0cm x 4.0cm x 1.0cm) Board Number Package MPS IC Number MP2109DQ QFN10 EV2109DQ-00A (3mm x 3mm)
EV2109DQ-00A Rev. 1.1 10/14/2005
50 0.0
0.2 0.4 0.6 LOAD CURRENT (A)
0.8
EV2109_EC01
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved.
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TM
EV2109DQ-00A - DUAL 800mA, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER EVALUATION BOARD
EVALUATION BOARD SCHEMATIC
EN1 C5 NS VOUT1 1.8V / 800mA
1 2 EN1 FB1
U1
10 SW1 GND 9
VIN
3
IN2
MP2109
IN1
8
4
GND SW2 5 EN2 6
FB2
7
VOUT2 1.2V / 800mA
EN2 C6 NS
EV2109_S01
EV2109DQ-00A BILL OF MATERIALS
Qty 2 2 2 2 3 2 2 1 Ref C1, C2 C3, C4 C5, C6 L1, L2 Value 10F 22F NS Description Ceramic Capacitor, 6.3V, X5R Ceramic Capacitor, 6.3V, X5R Do Not Stuff SMD 0603 0603 0603 QFN10 (3mm x 3mm) Sumida Any Any Any MPS MP2109DQ CDRH3D16-2R2 Package 1206 1206 Manufacturer Any Any Manufacturer P/N
2.2H Inductor, 1.2A
R1, R3, 300k Resistor, 1% R4 R2 150k Resistor, 1% R5, R6 U1 100k Resistor, 5% DC-DC Converter
EV2109DQ-00A Rev. 1.1 10/14/2005
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved.
2
TM
EV2109DQ-00A - DUAL 800mA, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER EVALUATION BOARD
PRINTED CIRCUIT BOARD LAYOUT
Figure 1--Top Silk Layer
Figure 2--Top Layer
Figure 3--Bottom Layer
EV2109DQ-00A Rev. 1.1 10/14/2005
www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved.
3
TM
EV2109DQ-00A - DUAL 800mA, 6V, 1.2MHz SYNCHRONOUS STEP-DOWN CONVERTER EVALUATION BOARD
QUICK START GUIDE
The output voltages of this board are set to 1.8V (VOUT1) and 1.2V (VOUT2). The board layout accommodates most commonly used inductors and output capacitors. 1. Attach the positive and negative ends of the first load to the VOUT1 and GND pins, respectively. If using both outputs, attach the positive and negative ends of the second load to the VOUT2 and GND pins, respectively. 2. Attach the input voltage 2.5V VIN 6V and input ground to VIN and GND pins respectively. 3. A 100k pull-up resistor has been connected to both the EN1 and EN2 pins, so both VOUT1 and VOUT2 will turn on without applying any external voltage to the EN1 and EN2 pins. 4. To turn on VOUT1/VOUT2 by using the EN1/EN2 functions, apply a voltage, 1.5V VEN1/EN2 6V, to the EN1/EN2 pin. To disable VOUT1/VOUT2, apply a voltage, VEN1/EN2 < 0.3V, to the EN1/EN2 pin. 5. The output voltages VOUT1 and VOUT2 can be changed by varying R2 and R4, respectively. Calculate the new values by the following formulae:
R2 = R1 VOUT1 -1 V FB
R4 =
R3 VOUT 2 V FB -1
Where VFB = 0.6V, R1 = 300k and R3 = 300k. Example: For VOUT1 = 1.8V:
R2 = 300k = 150k 1.8 V -1 0 .6 V
Therefore, use a 150k standard 1% value.
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.
EV2109DQ-00A Rev. 1.1 10/14/2005 www.MonolithicPower.com MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited. (c) 2005 MPS. All Rights Reserved.
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