EP3003 Evaluation Board Manual DESCRIPTION This manual aims to illustrate how to use the EP3003 Evaluation Board (“EP3003 EVB”). The EP3003 EVB is a Dual Synchronous, 600mA, 1.5MHz Step-Down DC/DC Regulator featuring the EP3003. The EP3003 EVB has an input voltage range of 2.5V to 5.5V, and either output is capable of delivering up to 600mA of output current. In Burst Mode operation, the EP3003 requires only 50 uA of quiescent current, and the EP3003 EVB provides higher efficiency at light load currents. In Pulse Skip mode, the EP3003 EVB provides lower output ripple voltage at light load currents. In either mode, the EP3003 EVB can provide up to 96% efficiency on either channel and consumes less than 1uA in shutdown. The EP3003 comes in a small 10-Pin MS10E package, which has an exposed pad on the bottom-side of the IC for better thermal performance. These features, plus the nominal operating frequency of 1.5MHz (allowing the exclusive use of low profile surface mount components), make the EP3003 EVB an ideal circuit for use in battery-powered, hand-held applications. This manual includes Quick Start for using the EP3003 EVB, Demonstration Circuit, PCB Layout and Bill of Material for the EP3003 EVB. QUICK START Demonstration circuit EP3003 EVB is easy to set up to evaluate the performance of the EP3003. Refer to Figure 1 for proper measurement equipment setup and follow the procedure below: 1. Connect the input power supply to the VIN and GND terminals on the up-side of the board. Do not hot-plug VIN or increase VIN over the rated maximum supply voltage of 5.5V, or the part may be damaged. Connect the loads between the VOUT and GND terminals on the right-side and left –side of the board. Refer to figure 1 for the proper measurement equipment setup. 2. Before proceeding to operation, jumper JP1 into the VOUT1 voltage position of choice (2.5V, 2.8V, and 3.3V), and JP2 into the VOUT2 voltage position of choice (1.2V, 1.5V, and 1.8V),and jumper JP3 into the desired mode of operation: Pulse Skip or Burst Mode. 3. Apply 3.3V at VIN. Measure both VOUTS; they should read 0V. If desired, one can measure the shutdown supply current at this point. The supply current will be approximately 33 uA in shutdown, with roughly 32 uA due to the optional 100k• pull-up resistor of the Power-On Reset (POR) feature. This resistor can be removed, and the actual shutdown supply current can be measured, if the POR feature is not required. 4. Turn on VOUT1 and VOUT2 by changing jumpers JP1 and JP2 of choice voltages. Vary the input voltage from 2.5V to 5.5V and adjust each load current from 0 to 600mA. Both output voltages should be regulating. 5. Set the load current of both outputs between 200 mA and 600 mA, and measure both output ripple voltages; they should measure less than 20 mVAC each. Also, observe the voltage waveform at the switch node (pin 3) of each regulator. The switching frequencies should be between 1.2 MHz and 1.8 MHz (T = 0.833 us and 0.555 us), and each switch node waveform should be rectangular in shape. Rev.01 1/5 EP3003 Evaluation Board Manual 6. To change the mode of operation, change jumpers JP1 and JP2 from the ON position(s) to the OFF position(s). Then change jumper JP3 to the alternative position. Re-insert jumpers JP1 and JP2 into the ON position(s). Observe the voltage waveform at both switch nodes. When finished, don’t forget disconnect the power. Figure 1. Proper Measurement Equipment Setup Rev.01 2/5 EP3003 Evaluation Board Manual Jump Setting JUMPER output voltage selection JP1 When AUX is selected please see the following section. JP2 When AUX is selected please see the following section. JUMPER Jump to GND Jump to VIN JP3 Pulse Skip Burst Mode Output Programming The output programming resistors for adjustable type are listed in Table 1. If AUX with JP1 and JP2 is selected, please put on R2-3 and R4-0 according to the following equation: R2 ⎞ ⎛ V out = 0 . 6V ⎜ 1 + ⎟ R1 ⎠ ⎝ Table 1 Output Programming Resistor Vout (V) R1 (KΩ) R2 (KΩ) 1.2 100 R2-0 = 100 1.5 100 R2-1 = 150 1.8 100 R2-2 = 200 AUX 100 R2-3 = Function 2.5 240 R4-3 = 750 2.8 240 R4-2 = 910 3.3 240 R2-1 = 1100 AUX 240 R2-0 = Function Rev.01 3/5 EP3003 Evaluation Board Manual DEMONSTRATION CIRCUIT PCB LAYOUT Rev.01 4/5 EP3003 Evaluation Board Manual BILL OF MATERIAL Item Qty Ref. 1 1 U1 IC,EP3003,DFN-10 2 2 L1, POWER L2 2.2UH 1.75A SMD C1, 10uF, 106P Y5 10V SMD 1206 22pF, 22P±10 16V SMD 0603 3 3 Part Description Manufacture/Part No. Note EP3003 INDUCTOR C4-K1.8L C2, C3 C4, 4 2 5 1 R1 100K± 5％ AAC 6 1 R2-0 100K± 5％ AAC 7 1 R2-1 150K± 5％ AAC 8 1 R2-2 200K± 5％ AAC 9 1 R3 150K± 5％ AAC 10 1 R4-1 750K± 5％ AAC 11 1 R4-2 910K± 5％ AAC 12 1 R4-3 1100K± 5％ AAC C5 Rev.01 5/5