150KHZ 500MA STEP DOWN VOLTAGE REGULATOR FSP3127 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, IQ typically 85 µA z High Efficiency z Uses readily available standard inductors z Thermal shutdown and current limit protection Typical Application z z z z Simple high-efficiency step-down (buck) regulator Efficient pre-regulator for linear regulators On-card switching regulators Positive to Negative convertor PIN ASSIGNMENT (Top View) * 1 8 OUTPUT * 2 7 VIN * 3 6 FB 4 GND 5 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 for the output switch and an over temperature shutdown for complete protection under fault conditions. *: 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) °C Infrared (15 sec.) 220 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. 1/8 2007-4-9 150KHZ 500MA STEP DOWN VOLTAGE REGULATOR FSP3127 OPERATING CONDITIONS Parameter Input Voltage Junction Temperature Symbol VIN TJ Test Conditions Min. 4.5 -40 Typ. Max. 40 +125 Unit V °C Test Conditions VFB = 1.3V (Adjustable Version Only) No Outside Circuit , VFB = 0V force drive on When Current Limit Occur and VFB ＜ 0.5V, TA=25°C Min. Typ. Max. 50 100 173 173 Unit ELECTRICAL CHARACTERISTICS Parameter Symbol Feedback Bias Current IFB Oscillator Frequency Fosc Short Circuit Oscillator Frequency FCSP Saturation Voltage VSAT Maximum Duty Cycle(On) Minimum Duty Cycle(Off) DC Current Limit ICL 150 10 30 50 kHz IOUT= 0.5A, 0.9 1.1 1.2 V 100 0 Output Leakage Current Output=1 Quiescent Current IQ Standby Quiescent Current ISTBY ON/OFF Pin=5V,VIN = 40V ON/OFF Pin Logic Input Threshold Voltage ON/OFF Pin Input Current ON/OFF Pin Logic Input Current VIL VIH IL Low (Regulator ON) High (Regulator OFF) VLOGIC=0.5V(ON) IH VLOGIC=2.5V(OFF) Thermal Resistance θJA Output Feedback IL VFB FSP3127-ADJ Junction to Ambient Junction to Ambient 4.5V ≤VIN ≤40V 0.1A ≤ILOAD ≤0.5A VOUT Programmed for 3V 0.65 0.58 2.0 SOP8L PDIP8L 1.193 1.18 VIN =12V, ILOAD= 0.5A 80 Output Feedback VFB 4.5V ≤VIN ≤40V 0.1A ≤ILOAD ≤0.5A 3.168 3.135 η VIN =12V, ILOAD= 0.5A 80 7V ≤VIN ≤40V 0.2=1A ≤ILOAD ≤2=0.5A VIN =12V, ILOAD= 2=0.5A 4.8 4.75 82 15V ≤VIN ≤40V 0.1A ≤ILOAD ≤0.5A 11.52 Output Feedback Efficiency Output Feedback FSP3127-5.0V VFB η FSP3127-12V VFB 1.3 1.4 A 2 50 µA 2 5 15 10 200 250 0.6 mA mA 1.3 0.02 5 5 15 1.23 µA V µA ℃/W 1.267 1.28 V % 3.3 3.432 3.465 V % 5 12 5.2 5.25 11.4 12.48 12.6 Efficiency η VIN =12V, ILOAD= 0.5A 88 Specifications with boldface are for full operating temperature range, the other type are for TJ=25°C 2/8 kHz % 150 95 η FSP3127-3.3V 0.8 85 Efficiency Efficiency nA 127 110 VFB = 0V force drive on VFB =12V force drive off Peak Current No Outside Circuit , VFB = 0V force drive on No Outside Circuit , VFB = 12V force drive off VIN = 40V VFB = 12V force drive off Output=0 10 2007-4-9 V % V % 150KHZ 500MA STEP DOWN VOLTAGE REGULATOR FSP3127 FUNCTIONAL BLOCK DIAGRAM FUNCTIONAL DESCROPTION 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. Ground Circuit ground. Output Internal switch. The voltage at this pin switches between (VIN - VSAT) 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 using logic level signals thus dropping the total input supply current to approximately 80 mA. Pulling this pin below a threshold 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. 3/8 TYPICAL APPLICATION CIRCUIT 2007-4-9 150KHZ 500MA STEP DOWN VOLTAGE REGULATOR FSP3127 TYPICAL CHARACTERISTICS 4/8 2007-4-9 150KHZ 500MA STEP DOWN VOLTAGE REGULATOR FSP3127 TYPICAL CHARACTERISTICS (CONTINUED) 5/8 2007-4-9 150KHZ 500MA STEP DOWN VOLTAGE REGULATOR FSP3127 TYPICAL CHARACTERISTICS (CONTINUED) ORDER INFORMATION FSP3127XXXX Package: S: SOP8L N: PDIP8L Temperature Grade: Output Voltage: Packing: Blank: Tube or Bulk E: -40~125℃ Blank: ADJ A: Tape & Reel 33: 3.3V 50: 5.0V 12: 12V MARKING INFORMATION (1) SOP8L (2) PDIP8L Logo Logo 3127-VV YYWWXX 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) 6/8 3127-VV YYWWXX 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) 2007-4-9 150KHZ 500MA STEP DOWN VOLTAGE REGULATOR FSP3127 PACKAGE INFORMATION θ H E (1) SOP8L D 7ο(4х) e B A 0.015х45ο A1 A2 7ο(4х) VIEW “A” Symbol A A1 A2 B C D E e H L θ 7/8 Dimensions In Millimeters Nom. Max. 1.60 1.75 0.25 1.45 1.55 0.41 0.51 0.20 0.25 4.90 5.00 3.90 4.00 1.27TYP. 5.80 5.99 6.30 0.38 0.71 1.27 0ο 8ο Min. 1.35 0.10 1.35 0.33 0.19 4.80 3.80 Dimensions In Inches Min. Nom. 0.053 0.063 0..004 0.053 0.057 0.013 0.016 0.0075 0.008 0.192 0.196 0.148 0.154 0.050TYP. 0.228 0.236 0.015 0.028 0ο 2007-4-9 Max. 0.069 0.010 0.061 0.020 0.010 0.200 0.160 0.248 0.050 8ο 150KHZ 500MA STEP DOWN VOLTAGE REGULATOR FSP3127 (2) PDIP8L D E1 E-PIN 0.018inch E PIN #1INDENT 0.025 DEEP 0.006-0.008 Inch 15°(4х) 7°(4х) C A A2 eB S e A1 L B B2 B1 Symbol A A1 A2 B B1 B2 C D E E1 e L eB S 8/8 Min. 0.38 3.1 0.36 1.4 0.81 0.20 9.02 7.62 6.15 2.92 8.38 0.71 Dimensions In Millimeters Nom. Max. 5.33 3.30 0.46 1.52 0.99 0.25 9.27 7.94 6.35 2.54 3.3 8.89 0.84 Min. Dimensions In Inches Nom. 3.5 0.56 1.65 1.14 0.36 9.53 8.26 6.55 0.015 0.122 0.014 0.055 0.032 0.008 0.335 0.300 0.242 3.81 9.40 0.97 0.115 0.330 0.028 0.130 0.018 0.060 0.039 0.010 0.365 0.313 0.250 0.100 0.130 0.350 0.033 2007-4-9 Max. 0.210 0.138 0.022 0.065 0.045 0.014 0.375 0.325 0.258 0.150 0.370 0.038