Preliminary Datasheet 1.5MHz Synchronous Step-down DC-DC Converter General Description Features The AP3410 is a high efficiency step-down DC-DC voltage converter. The chip operation is optimized by peak-current mode architecture with built-in synchronous power MOSFET switchers. The oscillator and timing capacitors are all built-in providing an internal switching frequency of 1.5MHz that allows the use of small surface mount inductors and capacitors for portable product implementations. • • • • • • • • • • • • • • Integrated Soft Start (SS), Under Voltage Lock Out (UVLO), Thermal Shutdown Detection (TSD) and Short Circuit Protection are designed to provide reliable product applications. The device is available in adjustable output voltage version ranging from 0.6V to 0.9×VIN when input voltage range is from 2.5V to 5.5V, and is able to deliver up to 1.2A. The AP3410 is available DFN-2×2-6 packages. in SOT-23-5 AP3410 High Efficiency Buck Power Converter Wide Input Voltage Range: 2.5V to 5.5V Adjustable Output Voltage: 0.6V to 0.9×VIN Low RDS(ON) Internal Switches:200mΩ (VIN=5V) Built-in Power Switches for Synchronous Rectification with High Efficiency Output Current: 1.2A Feedback Voltage: 600mV 1.5MHz Constant Frequency Operation Thermal Shutdown Protection Low Dropout Operation at 100% Duty Cycle No Schottky Diode Required Input Over Voltage Protection Output Over Voltage Protection Over Current Protection Applications and • • SOT-23-5 Post DC-DC Voltage Regulation PDA and Notebook Computer DFN-2×2-6 Figure 1. Package Types of AP3410 Mar. 2013 Rev. 1. 1 BCD Semiconductor Manufacturing Limited 1 Preliminary Datasheet 1.5MHz Synchronous Step-down DC-DC Converter AP3410 Pin Configuration EN 1 GND 2 LX 3 K Package DN Package (SOT-23-5) (DFN-2×2-6) 5 FB 4 VIN Figure 2. Pin Configuration of AP3410 (Top View) Pin Description Pin Number Pin Name Function SOT-23-5 DFN-2×2-6 1 2 EN 2 5 GND 3 4 LX Switch output pin 4 3 VIN Power supply 5 6 FB Feedback voltage of output 1 NC No internal connection Mar. 2013 Chip enable pin. Active high Ground pin Rev. 1. 1 BCD Semiconductor Manufacturing Limited 2 Preliminary Datasheet 1.5MHz Synchronous Step-down DC-DC Converter AP3410 Functional Block Diagram Figure 3. Functional Block Diagram of AP3410 Mar. 2013 Rev. 1. 1 BCD Semiconductor Manufacturing Limited 3 Preliminary Datasheet 1.5MHz Synchronous Step-down DC-DC Converter AP3410 Ordering Information AP3410 G1: Green Circuit Type K: SOT-23-5 DN: DFN-2×2-6 Package TR: Tape & Reel Temperature Range Part Number Marking ID Packing Type SOT-23-5 -40 to 85ºC AP3410KTR-G1 GHW Tape & Reel DFN-2×2-6 -40 to 85ºC AP3410DNTR-G1 CJ Tape & Reel BCD Semiconductor's Pb-free products, as designated with "G1" suffix in the part number, are RoHS compliant and green. Absolute Maximum Ratings (Note 1) Parameter Symbol Value Unit Input Voltage for the MOSFET Switch VIN 0 to 6.0 V Enable Input Voltage VEN -0.3 to VIN+0.3 V LX Pin Switch Current ILX 1.8 A Power Dissipation (on PCB, TA=25°C) PD Thermal Resistance (Junction to Ambient, Simulation) θJA Thermal Resistance (Junction to Case, Simulation) Operating Junction Temperature θJC SOT-23-5 0.4 DFN-2×2-6 SOT-23-5 1.89 250 DFN-2×2-6 53 SOT-23-5 130 W ºC/W ºC/W TJ 155 ºC Storage Temperature TSTG -55 to 150 ºC Operating Temperature TOP -40 to 85 ºC ESD (Machine Model) VMM 200 V ESD (Human Body Model) VHBM 2000 V Note 1: Stresses greater than those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under “Recommended Operating Conditions” is not implied. Exposure to “Absolute Maximum Ratings” for extended periods may affect device reliability. Mar. 2013 Rev. 1. 1 BCD Semiconductor Manufacturing Limited 4 Preliminary Datasheet 1.5MHz Synchronous Step-down DC-DC Converter AP3410 Recommended Operating Conditions Parameter Symbol Min Max Unit Supply Input Voltage VIN 2.5 5.5 V Operating Ambient Temperature TA -40 85 ºC Operating Junction Temperature TJ -40 125 ºC Electrical Characteristics VIN=VEN=5V, VOUT=1.2V, VFB=0.6V, L=2.2µH, CIN=4.7µF, COUT=10µF, TA=25°C, unless otherwise specified. Parameters Symbol Conditions Input Voltage Range VIN Shutdown Current IOFF VEN=0 Active Current Regulated Feedback Voltage Regulated Output Voltage Accuracy Peak Inductor Current ION VFB=0.55V Oscillator Frequency VIN=2.5V to 5.5V, IOUT=0 to 1.2A VIN=2.5V to 5.5V Max Unit 5.5 V 0.1 µA µA 220 0.588 IPK fOSC Typ 2.5 VFB ∆VOUT/VOUT Min 0.6 -3 1.5 1.9 1.2 1.5 0.612 V 3 % A 1.8 MHz PMOSFET RDS(ON) RDS(ON)P VIN=5V 200 mΩ NMOSFET RDS(ON) EN High Level Input Voltage EN Low Level Input Voltage EN Input Current RDS(ON)N VIN=5V 200 mΩ Soft Start Time Maximum Duty Cycle Under Voltage Lock Out Threshold Thermal Shutdown Mar. 2013 1.5 VEN_H V VEN_L 0.4 V IEN 0.1 µA tSS DMAX VUVLO TSD µs 400 100 % Rising 2.3 Falling 2.1 Hysteresis 0.2 Hysteresis=30°C 155 Rev. 1. 1 V 160 °C BCD Semiconductor Manufacturing Limited 5 Preliminary Datasheet 1.5MHz Synchronous Step-down DC-DC Converter AP3410 Typical Performance Characteristics VIN=5V, TA=25°C, unless otherwise noted. 100 0.70 95 0.68 Regulated Feedback Voltage (V) 90 85 Efficiency (%) 80 75 70 VIN=5.0V VOUT=1.0V VOUT=1.2V VOUT=1.8V VOUT=2.5V VOUT=3.3V 65 60 55 50 0.66 0.64 0.62 0.60 0.58 0.56 0.54 0.52 45 40 0.0 0.2 0.4 0.6 0.8 1.0 0.50 -40 1.2 Output Current (A) 0 20 40 60 80 100 120 140 o Temperature ( C) Figure 5. Regulated Feedback Voltage vs. Temperature Figure 4. Efficiency vs. Output Current VOUT_AC 10mV/div VOUT_AC 10mV/div VSW 2V/div VSW 2V/div IL 1A/div IL 500mA/div Time 400ns/div Time 800µs/div Figure 6. Output Ripple (IOUT=0A) Mar. 2013 VIN=5.0V -20 Figure 7. Output Ripple (IOUT=1.2A) Rev. 1. 1 BCD Semiconductor Manufacturing Limited 6 Preliminary Datasheet 1.5MHz Synchronous Step-down DC-DC Converter AP3410 Typical Performance Characteristics (Continued) VIN=5V, TA=25°C, unless otherwise noted. VEN 5V/div VEN 5V/div VSW 5V/div VOUT 1V/div VSW 5V/div VOUT 1V/div IL 500mA/div IL 500mA/div Time 800µs /div Time 200µs/div Figure 8. Enable Turn On (IOUT=1.2A) Figure 9. Enable Turn Off (IOUT=1.2A) VOUT 1V/div VOUT 1V/div VSW 5V/div VSW 5V/div IL 2A/div IL 2A/div Time 200µs /div Time 200µs/div Figure 10. Short Circuit Protection (IOUT=1.2A) Mar. 2013 Figure 11. Short Circuit Protection Recovery (IOUT=1.2A) Rev. 1. 1 BCD Semiconductor Manufacturing Limited 7 Preliminary Datasheet 1.5MHz Synchronous Step-down DC-DC Converter AP3410 Typical Application Figure 12. Typical Applications of AP3410 Table 1. Component Guide VOUT (V) Mar. 2013 R1 (kΩ) R2 (kΩ) L (µH) 3.3 450 100 2.2 2.5 320 100 2.2 1.8 200 100 2.2 1.2 100 100 2.2 1.0 66 100 2.2 Rev. 1. 1 BCD Semiconductor Manufacturing Limited 8 Preliminary Datasheet 1.5MHz Synchronous Step-down DC-DC Converter AP3410 Mechanical Dimensions SOT-23-5 Unit: mm(inch) 2.820(0.111) 3.100(0.122) 0.100(0.004) 0.200(0.008) 0.200(0.008) 0.700(0.028) REF 0.950(0.037) TYP 0.300(0.012) 0.500(0.020) 0° 8° 1.800(0.071) 2.000(0.079) 0.000(0.000) 0.150(0.006) 0.900(0.035) 1.300(0.051) Mar. 2013 Rev. 1. 1 BCD Semiconductor Manufacturing Limited 9 Preliminary Datasheet 1.5MHz Synchronous Step-down DC-DC Converter AP3410 Mechanical Dimensions (Continued) DFN-2×2-6 Mar. 2013 Rev. 1. 1 Unit: mm(inch) BCD Semiconductor Manufacturing Limited 10 BCD Semiconductor Manufacturing Limited http://www.bcdsemi.com IMPORTANT NOTICE BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifications herein. 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