FAC1410 FS | Alldatasheet

Document overview

  • Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
  • PDF pages: 10

Technical content

Features

  • 2A Constant Output Current
  • 140mΩ RDSON Internal Power PMOSFET Switch
  • Up to 95% Efficiency
  • Fixed 380KHz Frequency
  • Wide 3.6V to 20V Input Voltage Range
  • Output Adjustable from 1.222V to 18V
  • Built in Frequency Compensation
  • Built in Thermal Shutdown Function
  • Built in Current Limit Function
  • SOIC-8 Package is Available
  • The minimum dropout up to 0.3V

Applications

  • Portable DVD
  • LCD Monitor / TV
  • Battery Charger
  • ADSL Modem
  • Telecom / Networking Equipment Figure 1 Package Type 2007. 12. 18 1/10 SEMICONDUCTOR TECHNICAL DATA FAC1410 Revision No : 0

2A 380KHZ 20V PWM Buck DC/DC Converter Pin Configurations Figure 2 Pin Configuration of FAC1410 (Top View) Pin Description Pin Number Pin Name Description 1,6, 8 NC Not Connect.

2 Vin

Supply Voltage Input Pin. FAC1410 operates from a 3.6V to 20V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input. 3 SW Power Switch Output Pin. SW is the switch node that supplies power to the output.

4 GND

Ground Pin. Care must be taken in layout. This pin should be placed outside of the Schottky Diode to output capacitor ground path to prevent switching current spikes from inducing voltage noise into FAC1410. 5 FB Feedback Pin. Through an external resistor divider network, FB senses the output voltage and regulates it. The feedback threshold voltage is 1.222V . 7 EN Enable Pin. EN is a digital input that turns the regulator on or off .Drive EN pin high to turn on the regulator, drive it low to turn it off.

Ordering Information

F : SOP8 Packing Blank: Tube R: Type and Reel 2007. 12. 18 2/10 FAC1410 Revision No : 0

2A 380KHZ 20V PWM Buck DC/DC Converter Function Block Figure 3 Function Block Diagram of FAC1410 Absolute Maximum Ratings Parameter Symbol Value Unit Input Voltage VIN -0.3 to 20 V Feedback Pin Voltage VFB -0.3 to Vin V Enable Pin Voltage VEN -0.3 to 12 V Switch Pin Voltage VSW -0.3 to Vin V Power Dissipation PD Internally limited mW Operating Junction Temperature TJ 150 ºC Storage Temperature TSTG -65 to 150 ºC Lead Temperature (Soldering, 10 sec) TLEAD 260 ºC V 0 0 0 2 ) M B H ( D S E Note1: Stresses greater than those listed under Maximum Ratings may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operation is not implied. Exposure to absolute maximum rating conditions for extended periods may affect reliability. 2007. 12. 18 3/10 FAC1410 Revision No : 0

2A 380KHZ 20V PWM Buck DC/DC Converter Recommended Operating Conditions Parameter Input Voltage VIN 3.6 20 V Operating Junction Temperature T J -40 125 ºC Operating Ambient Temperature T A -40 85 ºC

Electrical Characteristics

VCC = 12V, Ta = 25 unless otherwise specified.˚C Input voltage VIN 3.6 20 V Shutdown Supply Current I STBY V EN=0V 30 90 uA Supply Current ICC V EN=2V , VFB=1.3V 3.6 4 mA Feedback V oltage VFB V IN = 3.6V to 23V 1.21 1.222 1.26 V Feedback Bias Current I FB V FB=1.3V 0.1 0.5 uA Switch Current Limit I LIM 3 4 A Oscillator Frequency F OSC 320 380 440 KHz Frequency of Current Limit or Short Circuit Protection FOSC1 V FB=0V 42 KHz EN Pin Threshold VEN 0.7 1.2 1.7 V IH V EN=2.5V -0.1 -1 uA EN Pin Input Leakage Current IL V EN=0.5V -3 -10 uA Internal PMOS RDSON R DSON VIN =12V , VFB=0V VEN=12V , Iout=2A 140 m Ω Max. Duty Cycle DMAX V FB=0V , ISW=0.1A 100 % Efficiency η VIN=12V ,V out=5V Iout=2A - 92 - % Thermal Shutdown T OTSD 165 ºC 2007. 12. 18 4/10 FAC1410 Revision No : 0 Unit Max.Min.Symbol Parameter Unit Max.Min.Symbol Typ.Test Condition

2A 380KHZ 20V PWM Buck DC/DC Converter Typical Application Circuit Fig8. Typical Application Circuit @ 5V/2A Fig9. Typical Application Circuit @ 3.3V/2A FAC1410 FAC1410 5.5V~20V DC INPUT 4.5V~20V DC INPUT 5V2A 3.3V2A R2=2K R1=6.2K R2=3.6K R1=6.2K 2007. 12. 18 6/10 FAC1410 Revision No : 0

2A 380KHZ 20V PWM Buck DC/DC Converter Fig10. Typical Application Circuit (with ceramic output capacitor) @ 5V/2A Fig11. Typical Application Circuit (with ceramic output capacitor) @ 3.3V/2A FAC1410 FAC1410 5.5V~20V DC INPUT 4.5V~20V DC INPUT 5V2A 3.3V2A R2=2K R1=6.2K R2=3.6K R1=6.2K 2007. 12. 18 7/10 FAC1410 Revision No : 0

Table 1 lists some rectifier manufacturers. Table 2 Schottky Diode manufacturers.

1 R t u o V R2

Table 3. Vout VS. R1, R2 Select Table

2A 380KHZ 20V PWM Buck DC/DC Converter Function Description Pin Functions VIN This is the positive input supply for the IC switching regulator. A suitable input bypass capacitor must be present at this pin to minimize voltage transients and to supply the switching currents needed by the regulator Gnd Circuit ground. SW Internal switch. The voltage at this pin switches between (V IN – VGS) and approximately – 0.5V, with a duty cycle of approximately VOUT / VIN. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be kept a minimum. FB Senses the regulated output voltage to complete the feedback loop. EN Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 30uA. Pulling this pin below a threshold voltage of approximately 0.7 V turns the regulator down, and pulling this pin above 1.3V (up to a maximum of 12V) shuts the regulator on. For automatic starup condition , can be implemented by the addition of a resistive voltage divider from V IN to GND. The SOP8 package needs a heat sink under most conditions. The size of the heat sink depends on the input voltage, the output voltage, the load current and the ambient temperature. The FAC1410 junction temperature rises above ambient temperature for a 2A load and different input and output voltages. The data for these curves was taken with the FAC1410 (SOP8 package) operating as a buck-switching regulator in an ambient temperature of 25˚C (still air). These temperature rise numbers are all approximate and there are many factors that can affect these temperatures. Higher ambient temperatures require more heat sinking. For the best thermal performance, wide copper traces and generous amounts of printed circuit board copper should be used in the board layout. (Once exception to this is the output (switch) pin, which should not have large areas of copper.) Large areas of copper provide the best transfer of heat (lower thermal resistance) to the surrounding air, and moving air lowers the thermal resistance even further. Package thermal resistance and junction temperature rise numbers are all approximate, and there are many factors that will affect these numbers. Some of these factors include board size, shape, thickness, position, location, and even board temperature. Other factors are, trace width, total printed circuit copper area, copper thickness, single or double-sided, multi-layer board and the amount of solder on the board. The effectiveness of the PC board to dissipate heat also depends on the size, quantity and spacing of other components on the board, as well as whether the surrounding air is still or moving. Furthermore, some of these components such as the catch diode will add heat to the PC board and the heat can vary as the input voltage changes. For the inductor, depending on the physical size, type of core material and the DC resistance, it could either act as a heat sink taking heat away from the board, or it could add heat to the board. 2007. 12. 18 9/10 FAC1410 Revision No : 0 Thermal Considerations The FAC1410 is available in SOP8 package.

2A 380KHZ 20V PWM Buck DC/DC Converter

Package Information

  1. 12. 18 10/10 FAC1410 Revision No : 0