FSP3127 FOSLINK | Alldatasheet
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150KHZ 500M A STEP DOWN VOLTAGE REGULATOR 2007-4-9 1/8 FSP3127 PIN ASSIGNMENT ( T o p V i e w ) *: Pin 1,2,3 No internal connection, but should be soldered to PC board for best heat transit ABSOLUTE MAXIMUM RATINGS(NOTE1) Parameter Value Unit Maximum Supply Voltage 45 V ON/OFF Pin Input Voltage -0.3 to 25 V Feedback Pin Voltage – 0.3 to 25 V Output Voltage to Ground(Steady State) -1 V Power Dissipation Internally limited Maximum Junction Temperature +150 °C ESD Susceptibility(Note 2) 2000 V Storage Temperature -65 to 150 °C Vapor Phase (60 sec.) 215 Lead Temperature (SOP8L) Infrared (15 sec.) 220 °C Lead Temperature (PDIP8L) (Soldering, 10 sec) 260 °C Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. Note 2: The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin. Typical Application z Simple high-efficiency step-down (buck) regulator z Efficient pre-regulator for linear regulators z On-card switching regulators z Positive to Negative convertor FB OUTPUT VIN GND ON/OFF GENERAL DESCRIPTION The FSP3127 series of regulators are monolithic integrated circuits that provide all the active functions for a step-down (buck) switching regulator, capable of driving a 0.5A load with excellent line and load regulation. These devices are available in fixed output voltages of 3.3V, 5V, 12V, and an adjustable output version, and are packaged in a 8-lead DIP and a 8-lead surface mount package. Requiring a minimum number of external components, these regulators are simple to use and feature internal frequency compensation, a fixed-frequency oscillator, and improved line and load regulation specifications. The FSP3127 series operates at a switching frequency of 150 kHz thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Because of its high efficiency, the copper traces on the printed circuit board are normally the only heat sinking needed. A standard series of inductors (both through hole and surface mount types) are available from several different manufacturers optimized for use with the FSP3127 series. This feature greatly simplifies the design of switch-mode power supplies. Other features include a guaranteed ±4% tolerance on output voltage under all conditions of input voltage and output load conditions, and ±15% on the oscillator frequency. External shutdown is included, featuring typically 85 µA stand-by current. Self protection features include a two stage frequency reducing current limit fo r the output switch and an over temperature shutdown for complete protection under fault conditions. FEATURES z 3.3V, 5V, 12V, and adjustable output versions z Adjustable version output voltage range, 1.2V to 37V ±4% max over line and load conditions z Available in 8-pin surface mount and DIP-8 package z Guaranteed 0.5A output current z Input voltage range up to 40V z Requires only 4 external components z 150 kHz fixed frequency internal oscillator z TTL Shutdown capability z Low power standby mode, I Q typically 85 µA z High Efficiency z Uses readily avail able standard inductors z Thermal shutdown and current limit protection
150KHZ 500M A STEP DOWN VOLTAGE REGULATOR 2007-4-9 2/8 FSP3127 OPERATING CONDITIONS Parameter Symbol Test Conditions Min. Typ. Max. Unit Input Voltage V IN 4.5 40 V Junction Temperature T J -40 +125 °C ELECTRICAL CHARACTERISTICS Parameter Symbol Test Conditions Min. Typ. Max. Unit 50 Feedback Bias Current I FB VFB = 1.3V (Adjustable Version Only) 10 100 nA 127 173 Oscillator Frequency F osc No Outside Circuit , VFB = 0V force drive on 110 150 173 kHz Short Circuit Oscillator Frequency FCSP When Current Limit Occur and VFB ＜ 0.5V, TA=25°C 10 30 50 kHz 1.1 Saturation Voltage V SAT I OUT= 0.5A, 0.9 1.2 V Maximum Duty Cycle(On) V FB = 0V force drive on 100 Minimum Duty Cycle(Off) DC VFB =12V force drive off 0 % 0.65 1.3 Current Limit I CL Peak Current No Outside Circuit , VFB = 0V force drive on 0.58 0.8 1.4 A Output=0 No Outside Circuit , VFB = 12V force drive off 2 50 µA Output=1 Output Leakage Current IL VIN = 40V 2 15 mA Quiescent Current I Q V FB = 12V force drive off 5 10 mA
200 Standby Quiescent Current I STBY ON/OFF Pin=5V,V IN = 40V 85 250 µA
VIL Low (Regulator ON) 0.6 ON/OFF Pin Logic Input Threshold Voltage VIH High (Regulator OFF) 2.0 1.3 V ON/OFF Pin Input Current I L V LOGIC=0.5V(ON) 0.02 5 ON/OFF Pin Logic Input Current IH V LOGIC=2.5V(OFF) 5 15 µA SOP8L Junction to Ambient 150 Thermal Resistance θJA PDIP8L Junction to Ambient 95 ℃/W 1.193 1.267Output Feedback VFB 4.5V ≤VIN ≤40V 0.1A ≤ILOAD ≤0.5A VOUT Programmed for 3V 1.18 1.23 1.28 V Efficiency FSP3127-ADJ η V IN =12V, ILOAD= 0.5A 80 % 3.168 3.432Output Feedback VFB 4.5V ≤VIN ≤40V Efficiency FSP3127-3.3V η V IN =12V, ILOAD= 0.5A 80 % 4.8 5.2 Output Feedback VFB 7V ≤VIN ≤40V 0.2=1A ≤ILOAD ≤2=0.5A 4.75 5 5.25 V Efficiency FSP3127-5.0V η V IN =12V, ILOAD= 2=0.5A 82 % 11.52 11.4 V Output Feedback VFB 15V ≤VIN ≤40V 0.1A ≤ILOAD ≤0.5A 12.48 12.6 Efficiency FSP3127-12V η V IN =12V, ILOAD= 0.5A 88 % Specifications with boldface are for full operating temperature range, the other type are for TJ=25°C
150KHZ 500M A STEP DOWN VOLTAGE REGULATOR 2007-4-9 3/8 FSP3127 FUNCTIONAL BLOCK DIAGRAM FUNCTIONAL DESCROPTION Pin Functions VIN This is the positive input supply for the IC switching regul ator. 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 (V IN - V SAT) and approximately +0.5V, with a duty cycle of VOUT/VIN. To minimize coupling to sensitive circuitry, the PC board copper area connected to this pin should be kept to a minimum. Feedback Senses the regulated output voltage to complete the feedback loop. ON/OFF Allows the switching regulator circuit to be shut down usi ng logic level signals thus dropping the total input supply current to approximately 80 mA. Pulling this pin below a th reshold voltage of approximately 1.3V turns the regulator on, and pulling this pin above 1.3V (up to a maximum of 25V) 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. TYPICAL APPLICATION CIRCUIT
150KHZ 500M A STEP DOWN VOLTAGE REGULATOR 2007-4-9 4/8 FSP3127 TYPICAL CHARACTERISTICS
150KHZ 500M A STEP DOWN VOLTAGE REGULATOR 2007-4-9 5/8 FSP3127 TYPICAL CHARACTERISTICS (CONTINUED)
150KHZ 500M A STEP DOWN VOLTAGE REGULATOR 2007-4-9 6/8 FSP3127 TYPICAL CHARACTERISTICS (CONTINUED) ORDER INFORMATION MARKING INFORMATION ( 1 ) S O P 8 L ( 2 ) P D I P 8 L FSP3127XXXX Package: S: SOP8L N: PDIP8L Output Voltage: Blank: ADJ 33: 3.3V 50: 5.0V 12: 12V Packing: Blank: Tube or Bulk A: Tape & Reel Temperature Grade: E: -40~125℃ Part number: 3127-ADJ: ADJ 3127-33: 3.3V 3127-50: 5.0V 3127-12: 12V Internal code 3127-VV YYWWXX Date code: YY: Year (01=2001) WW: Nth week (01~52) Logo Part number: 3127-ADJ: ADJ 3127-33: 3.3V 3127-50: 5.0V 3127-12: 12V Internal code Date code: YY: Year (01=2001) WW: Nth week (01~52) Logo 3127-VV YYWWXX
150KHZ 500M A STEP DOWN VOLTAGE REGULATOR 2007-4-9 7/8 FSP3127 PACKAGE INFORMATION (1) SOP8L Dimensions In Millimeters Dimensions In Inches e 1.27TYP . 0.050TYP . θ 0 ο 8 ο 0ο 8 ο E H θ e B D A 7ο(4х) 0.015х45ο VIEW “A” 7ο(4х)
150KHZ 500M A STEP DOWN VOLTAGE REGULATOR 2007-4-9 8/8 FSP3127 (2) PDIP8L Dimensions In Millimeters Dimensions In Inches A 5.33 0.210 A1 0.38 0.015 e 2.54 0.100 PIN #1INDENT 0.025 DEEP 0.006-0.008 Inch E-PIN 0.018inch D S e B A L 7°(4х) E eB C 15°(4х)