AP3403 EVB User Guide CONFIDENTIAL INFORMATION 1. General Description The AP3403 is a 2.0 MHz fixed frequency, current mode, PWM synchronous buck (step-down) DC-DC converter, capable of driving a 600mA load with high efficiency, excellent line and load regulation. The high efficiency is easily configured by using an inductor, resistors and capacitors as the external components. Current mode control provides fast transient response and cycle-by-cycle current limit. The AP3403 employs complete protection to ensure system security. Including input Under Voltage Lock Out, programmable Soft Start, Over Temperature Protection and hiccup mode Short Circuit Protection. This IC is available in U-DFN1616-6 package. 2. Key Features • Input Voltage Range ：2.3V to 5.5V (Absolute maximum rating: 6.5V) • Output Voltage Range： 0.7V to 5.5V(Note: As for 1.0V or less, input voltage range is limited.) • Feedback Voltage Accuracy ： ±9mV (VFB=0.6V) • Temperature-Drift Coefficient of Feedback Voltage： Typ. ±100ppm/°C • Oscillator Frequency ： Typ. 2.0MHz • Maximum Duty Cycle ： 100% • Built-in Driver ON Resistance ：Typ. Pch. 0.38Ω, Nch. 0.3Ω (VIN=3.6V) • Supply Current (at no load)：Typ. 34μA • Standby Current ：Max. 5μA • UVLO Detector Threshold：Typ. 2.0V • Soft-start Time： Typ. 150μs • LX Current Limit Circuit： Typ. 1A • Package： U-DFN1616-6 DO NOT DISTRIBUTE OR REPRODUCE WITHOUT PERMISSION FROM P.A.M Pow er Analog Microelectronics, Inc. Rev. V2.0 April. 2014 1 AP3403 EVB User Guide CONFIDENTIAL INFORMATION 3. EV Board Schematic 4. EVB AP3403 Description AP3403 is an evaluation board for the AP3403, a DC/DC converter. The board is targeted to be used in providing a simple and convenient evaluation environment for the AP3403. Requires parts, power supply connectors etc. on the board, which makes it easy to be evaluated. 5. Recommended External Components Symbol CIN COUT Value 4.7uF 10uF Components Part Number C1005X5R0J475M (TDK) Ceramic JMK105BBJ475MV (Taiyo Yuden) Capacitor GRM155R60J475ME47 (Murata) Ceramic GRM155R60J106ME44 (Murata) Capacitor JMK105CBJ106MV (Taiyo Yuden) LQM21PN2R2NGC (Murata) 2.2uH L CIG21L2R2MNE (Samsung Electro-Mechanics) MIPSZ2012D2R2 L (FDK) Inductor 4.7uH CIG21L4R7MNE (Samsung Electro-Mechanics) MIPS2520D4R7 (FDK) DO NOT DISTRIBUTE OR REPRODUCE WITHOUT PERMISSION FROM P.A.M Pow er Analog Microelectronics, Inc. Rev. V2.0 April. 2014 2 AP3403 EVB User Guide CONFIDENTIAL INFORMATION 6. Inductance Select for Output Voltage Setting Vo 1.0V 1.2V 1.5V 1.8V L 2.2uH 2.2uH 2.2uH 2.2uH 2.5V 2.8V 3.3V 2.2uH 4.7uH 4.7uH 7. Resistor & Capacitor Select for Output Voltage Setting The output voltage (VOUT) is adjustable by changing the R1 and R2 values as follows. (0.7V≤VOUT≤5.5V, VFB=0.6V) VOUT = VFB × (R1 + R2) / R2 Set Output Valtage(V) Resistor(KΩ) Capacitor(pF) VSET R1 R2 Cff 1.0 120 180 22 1.2 180 180 22 1.5 270 180 22 1.8 240 120 22 2.5 380 120 15 2.8 275 75 15 3.3 270 60 15 8. EV Board BOM List VSET=1.8V Item Value Type Rating Description CIN 4.7uF 0805 25V Input Capacitor COUT 10uF 0805 16V Output Capacitor Cff 22pF 0805 50V Feed Forward Capacitor L 2.2uH >1A Inductor R1 121KΩ 0805 1% R2 121KΩ 0805 1% R3 121KΩ 0805 1% IC AP3403 Voltage Set Resistor U-DFN1616-6 DO NOT DISTRIBUTE OR REPRODUCE WITHOUT PERMISSION FROM P.A.M Pow er Analog Microelectronics, Inc. Rev. V2.0 April. 2014 3 AP3403 EVB User Guide CONFIDENTIAL INFORMATION 9. EV Board View 10. PCB Layout Example Top Layer Bottom Layer DO NOT DISTRIBUTE OR REPRODUCE WITHOUT PERMISSION FROM P.A.M Pow er Analog Microelectronics, Inc. Rev. V2.0 April. 2014 4