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AP3405 Dataheets PDF



Part Number AP3405
Manufacturers Diodes
Logo Diodes
Description 600mA Step-down DC/DC Converter
Datasheet AP3405 DatasheetAP3405 Datasheet (PDF)

ADVANCED INFORMATION AP3405 600mA Step-down DC/DC Converter with Synchronous Rectifier Description The AP3405 is a 2.0MHz 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. T.

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ADVANCED INFORMATION AP3405 600mA Step-down DC/DC Converter with Synchronous Rectifier Description The AP3405 is a 2.0MHz 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 AP3405 employs complete protection to ensure system security, including input Undervoltage Lockout, Over-Temperature Protection and hiccup mode Short Circuit Protection. Pin Assignments (Top View) Pin 1 Mark NC 1 NC 2 AGND 3 EP This IC is available in U-DFN2020-8 package. PGND 4 8 EN 7 FB 6 VIN 5 SW U-DFN2020-8 (Type E) Features  High-Efficiency Buck Power Converter  Input Voltage Range: 2.3V to 5.5V  Output Voltage Range: 0.7V to 5.5V  Fixed 2.0MHz Oscillator Frequency  Built-in Soft-Start Time  Built-in Overcurrent Protection  Built-in Thermal Shutdown Function  Built-in UVLO Function  Hiccup Mode SCP  Output Current: 600mA  Package: U-DFN2020-8 (Type E)  Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)  Halogen and Antimony Free. “Green” Device (Note 3) Applications  Post DC-DC Voltage Regulation  Mobile Phones and Wearable Devices Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free. 3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and <1000ppm antimony compounds. Typical Applications Circuit VIN CIN 4.7μF ON/OFF L 2.2μH 6 VIN 5 SW AP3405 FB 7 8 EN AGND 3 PGND 4 R1 240KΩ R2 120KΩ VOUT 1.8V Cff 22pF COUT 10μF AP3405 Document number: DS38093 Rev. 1 - 2 1 of 9 www.diodes.com January 2016 © Diodes Incorporated ADVANCED INFORMATION AP3405 Pin Descriptions Pin Number 1,2 3 4 5 6 7 8 Pin Name NC AGND PGND SW VIN FB EN Function No connection Signal Ground Pin Power Ground Pin Power switch output pin. This pin is connected to the inductor. Supply power input pin. A capacitor should be connected between VIN pin and GND - to keep the input voltage constant. Feedback pin. This pin is connected to an external resistor divider to program the system output voltage. Control input pin. EN is a digital input that turns the regulator on or off. Drive EN high to turn the regulator on. Drive low to turn the regulator off. Functional Block Diagram EN 8 Slope Compensation Shutdown Comparator Bias Generator Soft Start Oscillator OCP Comparator UVLO Current Sensing PWM Comparator Control Logic Buffer & Dead Time Control Logic 7 FB Error Amplifier Reverse Inductor Current Comparator Bandgap Reference Vin OVP Comparator VIN 6 5 SW 4 PGND 3 AGND AP3405 Document number: DS38093 Rev. 1 - 2 2 of 9 www.diodes.com January 2016 © Diodes Incorporated ADVANCED INFORMATION AP3405 Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.) (Note 4) Note: Symbol Parameter Rating Unit VIN VIN Input Voltage VSW SW Pin Voltage -0.3 to 6.5 -0.3 to VIN + 0.3 V V VEN VFB ISW PD TSTG EN Pin Input Voltage VFB Pin Voltage SW Pin Output Current Power Dissipation (Standard Land Pattern) Storage Temperature Range -0.3 to 6.5 -0.3 to 6.5 1 640 -55 to +125 V V A mW °C VHBM ESD (Human Body Model) 2,000 V 4. 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. Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.) Symbol VIN TA Parameter Input Voltage Operating Ambient Temperature Min 2.3 -40 Max 5.5 +85 Unit V °C AP3405 Document number: DS38093 Rev. 1 - 2 3 of 9 www.diodes.com January 2016 © Diodes Incorporated ADVANCED INFORMATION AP3405 Electrical Characteristics (VIN = VEN = 3.6V (VOUT ≤ 2.6V), VIN = VEN = VOUT+1V (VOUT > 2.6V), unless otherwise specified. Specification with standard typeface are for TA = +25°C, and those in boldface type apply over the full operating temperature range (TA = -40°C to +85°C)) Symbol VIN IDD ISTDB VUVLO VHYS VENH VENL VFB IFBH IFBL RONH RONL ILIMH fOSC DMAX TOTSD THYS tSS Parameter Input Voltage Supply Current Standby Current Input UVLO Threshold Input UVLO Hysteresis EN Active Threshold Voltage EN Shutdown Threshold Voltage Feedback Voltage FB High Input Current FB Low Input Current High-Side Switch On-Resistance Low-Side Switch On-Resistance SW Current Limit Oscilla.


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