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150KHZ 500MA STEP DOWN VOLTAGE REGULATOR
FSP3127
FEATURES
3.3V, 5V, 12V, and adjustable output versions Adjustable version output voltage range, 1.2V to 37V 4% max over line and load conditions Available in 8-pin surface mount and DIP-8 package Guaranteed 0.5A output current Input voltage range up to 40V Requires only 4 external components 150 kHz fixed frequency internal oscillator TTL Shutdown capability Low power standby mode, IQ typically 85 A High Efficiency Uses readily available standard inductors Thermal shutdown and current limit protection
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 A 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.
Typical Application
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 2 3 8 OUTPUT 7 VIN 6 GND
FB 4
5 ON/OFF
*: 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.
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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
ELECTRICAL CHARACTERISTICS
Parameter Feedback Bias Current Oscillator Frequency Short Circuit Oscillator Frequency Saturation Voltage Maximum Duty Cycle(On) Minimum Duty Cycle(Off) Current Limit Output Leakage Current Output=1 Quiescent Current Output=0 Standby Quiescent Current ON/OFF Pin Logic Input Threshold Voltage ON/OFF Pin Input Current ON/OFF Pin Logic Input Current Thermal Resistance Output Feedback Efficiency Output Feedback Efficiency Output Feedback Efficiency Output Feedback FSP3127-5.0V Symbol IFB Fosc FCSP VSAT DC 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=25C IOUT= 0.5A, 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 ON/OFF Pin=5V,VIN = 40V Low (Regulator ON) High (Regulator OFF) VLOGIC=0.5V(ON) VLOGIC=2.5V(OFF) SOP8L PDIP8L Junction to Ambient Junction to Ambient 4.5V VIN 40V 0.1A ILOAD 0.5A VOUT Programmed for 3V VIN =12V, ILOAD= 0.5A 4.5V VIN 40V 0.1A ILOAD 0.5A VIN =12V, ILOAD= 0.5A 7V VIN 40V 0.2=1A ILOAD 2=0.5A VIN =12V, ILOAD= 2=0.5A 15V VIN 40V 0.1A ILOAD 0.5A 2.0 Min. Typ. 10 127 110 10 150 30 0.9 100 0 0.65 0.58 0.8 2 2 5 85 1.3 0.02 5 150 95 1.193 1.18 80 3.168 3.135 80 4.8 4.75 82 11.52 5 5.2 5.25 11.4 3.3 3.432 3.465 1.23 1.267 1.28 1.3 1.4 50 15 10 200 250 0.6 5 15 A /W V % V % V % V A A mA mA A V Max. 50 100 173 173 50 1.1 1.2 Unit nA kHz kHz V %
ICL
IL IQ ISTBY VIL VIH IL IH JA VFB
FSP3127-ADJ VFB FSP3127-3.3V VFB FSP3127-12V VFB
12
12.48 12.6 Efficiency VIN =12V, ILOAD= 0.5A 88 Specifications with boldface are for full operating temperature range, the other type are for TJ=25C
%
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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.
TYPICAL APPLICATION CIRCUIT
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150KHZ 500MA STEP DOWN VOLTAGE REGULATOR
FSP3127
TYPICAL CHARACTERISTICS
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150KHZ 500MA STEP DOWN VOLTAGE REGULATOR
FSP3127
TYPICAL CHARACTERISTICS (CONTINUED)
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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)
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)
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150KHZ 500MA STEP DOWN VOLTAGE REGULATOR
FSP3127
PACKAGE INFORMATION
(1) SOP8L
E
H
7(4)
D
7(4) 0.01545 A
e
A1
B
A2
VIEW "A"
Symbol A A1 A2 B C D E e H L
Min. 1.35 0.10 1.35 0.33 0.19 4.80 3.80
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 0 8
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 0
Max. 0.069 0.010 0.061 0.020 0.010 0.200 0.160 0.248 0.050 8
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150KHZ 500MA STEP DOWN VOLTAGE REGULATOR
(2) PDIP8L
FSP3127
D E-PIN 0.018inch
E1
E
PIN #1INDENT 0.025 DEEP 0.006-0.008 Inch
15(4)
7(4)
C
L S e B B1 A1 B2
A
Symbol A A1 A2 B B1 B2 C D E E1 e L eB S
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 3.5 0.56 1.65 1.14 0.36 9.53 8.26 6.55 3.81 9.40 0.97
A2
eB
Min.
Dimensions In Inches Nom. 0.130 0.018 0.060 0.039 0.010 0.365 0.313 0.250 0.100 0.130 0.350 0.033
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
0.015 0.122 0.014 0.055 0.032 0.008 0.335 0.300 0.242 0.115 0.330 0.028
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