FAC1509 FS | Alldatasheet
Document overview
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Technical content
Features
- 5V and Adjustable output versions Output adjustable from 1.23v to 43V
- Fixed 150KHz frequency internal oscillator
- Guaranteed 2A output load current
- Input voltage range up to 45V
- Low power standby mode, I Q typically 50 µA
- TTL shutdown capability
- Excellent line and load regulation
- High efficiency
- Thermal shutdown and current limit protection
- Available in advantaged SOP8 DIP8 package
Applications
- Simple High-efficiency step-down regulator
- On-card switching regulators
- Positive to negative converter
- LCD monitor and LCD TV
- DVD recorder and PDP TV
- Battery charger Package Types SOP8
Figure 1. Package Types of FAC1509
2A 150KHZ PWM Buck DC/DC Converter Pin Assignments Pin Descriptions
Ordering Information
Active is “Low” or floating SOP8/DIP8 X XFAC1509 Circuit Type Package F : SOP8 P : DIP8 Output Versions R: Adjustable Output 5: Fixed Output 5V 2008. 1. 28 2/13 FAC1509 Revision No : 0 (Top View) Description Name Input supply voltage ON/OFF Feedback Gnd Output V IN1 5~8
Figure 2. Functional Block Diagram of FAC1509
Figure 3. Typical Application of FAC1509
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. UnitValueParameter V-0.3 to 45Supply Voltage VIN V-0.3 to VIN+0.3Feedback VFB pin voltage VON/OFF Pin voltage VOutput pin voltage Output Voltage to Ground (Steady State) WInte rna lly limitedPower Dissipation Operating Temperature Range -40 to +125 ºC Storage Temperature -65 to +150 ºC Lead Temperature (Soldering, 10 sec) 200 ºC V2000ESD(HM)
Electrical Characteristics
Unless otherwise specified, VIN = 12V. ILOAD = 0.5A, TA = 25˚C. Symbol ID Feedback bias current nA IQ Quiescent current ISTBY Standby quiescent current ON/OFF=5V, VIN=36V FOSC KHz 150 Oscillator frequency VSAT Saturation voltage ICL Current Limit Output leakage currentIL IL Output leakage current VVIL VIH ON/OFF pin logic input Threshold voltage High (Regulator OFF) 2008. 1. 28 5/13 FAC1509 Revision No : 0 2A 150KHZ PWM Buck DC/DC Converter -0.3 to VIN+0.3 -0.3 to VIN+0.3 -1 V VFB=1.3V VFB=12V force driver off IOUT=2A Peak Current (VFB=0V) Output=0V (VFB=12V) Output=-1V (VIN=32V) Low (Regulator ON) 1.8 1.10 3.8 1.8 127 2.0 173 50/ 100 0.6 1.3 mA μA V A mA V μA Parameter Conditions Min. Typ. Max. Unit
VLOGIC=2.5V(Regulator OFF) uA IH IL ON/OFF pin input current VLOGIC=0.5V(Regulator ON) θJC Thermal Resistance Junction to Case SOP8/DIP8 ˚C/W θJA Thermal Resistance Junction to Ambient (Note1) SOP8/DIP8 Vfb: Output Voltage 11V≤VIN≤45V, 0.2A ≤ILOAD ≤2A, VOUT for 9V 1.193 / 1.23 1.267 / V ADJ η: Efficiency VIN=12V,VOUT=9V,ILOAD=2A % Vout: Output Voltage 7V≤VIN≤45V, 0.2A ≤ILOAD ≤2A 4.800 / 5.0 5.200 / V η: Efficiency VIN=12V, ILOAD=2A % Specifications with boldface type are for full operationg temperature range, the other type are for TJ=25˚C. Note1: Thermal resistance with copper area of approximately 3 in2. 2008. 1. 28 6/13 FAC1509 Revision No : 0 2A 150KHZ PWM Buck DC/DC Converter 0.02 5 uA ˚C/W
Table 1. FAC1509 Series Buck Regulator Design Procedure For 5V Figure 11. Typical Application of FAC1509 For 5V
Figure 12. Typical Application of FAC1509 For ADJ Table 2. Vout VS. R1, R2, Cf Select Table Table 3. Typical Application Buck Regulator Design Procedure
+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 Ground Circuit ground. Output Internal switch. The voltage at this pin switches between (+VIN – VSAT) and approximately – 0.5V, with a duty cycle of approximately VOUT / V IN. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be kept a minimum. Feedback Senses the regulated output voltage to complete the feedback loop. ON/OFF Allows the switching regulator circuit to be shutdown using logic level signals thus dropping the total input supply current to approximately 50uA. Pulling this pin below a threshold voltage of approximately 1.3V turns the regulator on, a nd pulling this pin above 1.3V (up to a maximum of 32V) shuts the regulator down. If this shutdown feature is not needed, the ON /OFF pin can be wired to the ground pin or it can be left open, in either case the regulator will be in the ON condition. Thermal Considerations The FAC1509 is available in SOP8/DIP8 package. 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 FAC1509 ju nction temperature rises above ambient temperature for a 2A load a nd different input and output voltages. The data for these curves was taken with the FAC1509 (SOP8/DIP8 package) operating as a buck-switching regulator in an ambient temperature of 25 oC (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 am ounts 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. 2008. 1. 28 11/13 FAC1509 Revision No : 0 2A 150KHZ PWM Buck DC/DC Converter
Package Information
- 1. 28 12/13 FAC1509 Revision No : 0 2A 150KHZ PWM Buck DC/DC Converter A b c D E e L θ Dimensions In Millimeters Dimensions In Inches Min 1.350 0.100 1.350 0.330 0.170 4.700 3.800 5.800 1.270 (BSC) 0.400 Max 1.750 0.250 1.550 0.510 0.250 5.100 4.000 6.200 1.270 Min 0.053 0.004 0.053 0.013 0.006 0.185 0.150 0.228 0.050 (BSC) 0.016 Max 0.069 0.010 0.061 0.020 0.010 0.200 0.157 0.244 0.050 Symbol
- 1. 28 13/13 FAC1509 Revision No : 0 2A 150KHZ PWM Buck DC/DC Converter INCHESMILLIMETERSDIM A B C D F G H J K L M N MIN 9.40 6.10 3.94 0.38 1.02
2.54 BSC
0.76 0.20 2.92
7.62 BSC
0.76 MAX 10.16 6.60 4.45 0.51 1.78 1.27 0.30 3.43 1.01 MIN 0.370 0.240 0.155 0.015 0.040
0.100 BSC
0.030 0.008 0.115
0.300 BSC
0.030 MAX 0.400 0.260 0.175 0.020 0.070 0.050 0.012 0.135 0.040