SPX2870
6.5A Low Dropout Voltage Regulator Adjustable & Fixed Output, Fast Response
FEATURES
• Adjustable Output Down To 1.2V • Fixed Output Voltages 2.5, 3.3 & 5.0V • Output Current of 6.5A • Low Dropout Voltage 1.1V Typ. • Extremely Tight Load And Line Regulation • Current & Thermal Limiting • Standard 3-Terminal Low Cost TO-220 & TO-263
APPLICATIONS
• Powering VGA & Sound Card • Power PC Supplies • SMPS Post-Regulator • High Efficiency “Green” Computer Systems • High Efficiency Linear Power Supplies • Portable Instrumentation • Constant Current Regulators • Adjustable Power Supplies • Battery charger
PRODUCT DESCRIPTION
The SPX2870 are low power 6.5A adjustable and fixed voltage regulators that are very easy to use. It requires only 2 external resistors to set the output voltage for adjustable version. The SPX2870 are designed for low voltage applications that offers lower dropout voltage and faster transient response. This device is an excellent choice for use in powering low voltage microprocessor that require a lower dropout, faster transient response to regulate from +2.5V to 3.8V supplies and as a post regulator for switching supplies applications. The SPX2870 features low dropout of a maximum 1.5 volts. The SPX2870 offers full protection against over-current faults, reversed input polarity, reversed load insertion, and positive and negative transient voltage. On-Chip trimming adjusts the reference voltage to 1%. The IQ of this device flows into the load, which increases efficiency. The SPX2870 are offered in a 3-pin TO-220 and TO-263 packages compatible with other 3 terminal regulators. For a 8A low dropout regulator refer to the SPX2880 data sheet.
PIN CONNECTIONS
TO-263-3 (T)
TO-220-3 (U)
SPX2870
1 2 3
SPX2870
1 2 3
ADJ/GND VOUT VIN
Top View
ADJ/GND VOUT VIN
Front View
Rev. 10/30/00
SPX2870
ABSOLUTE MAXIMUM RATINGS
Lead Temp. (Soldering, 10 Seconds) .............................. 300°C Storage Temperature Range ............................ -65° to +150°C Operating Junction Temperature Range SPX2870 Control Section.......................... -45°C +125°C SPX2870 Power Transistor.........................-45°C +150°C Input Voltage........................................................ 10V Input to Output Voltage Differential .................... 10V
ELECTRICAL CHARACTERISTICS (NOTE 1) at IOUT = 10mA, TA=25°C, unless otherwise specified.
PARAMETER
2.5V Version Output Voltage (Note 2) 3.3V Version Output Voltage (Note 2) 5.0V Version Output Voltage (Note 2) All Voltage Options Reference Voltage (VREF) Min. Load Current (Note 3) Line Regulation (∆VREF(VIN)) VIN≤ 7V, P≤ PMAX 1.5V≤ (VIN -VOUT)≤5.75V, 10mA≤IOUT≤5A 1.5V≤ (VIN –VOUT)≤5.75V 2.75V≤VIN ≤7V, IOUT=10mA, TJ=25ºC (Note 3) VIN ≤7V, IOUT=0mA, TJ=25ºC (Note 2) 10mA≤IOUT ≤5A, (Vin-VOUT)=3V, TJ=25ºC (Note 3) 0≤IOUT ≤5A, VIN=7V, TJ=25ºC (Note 2) Dropout Voltage Current Limit IOUT(MAX) Long Term Stability Thermal Regulation (∆VOUT(PWR)) Temperature Stability (∆VOUT(T)) Output Noise, RMS Thermal Resistance 10Hz to 10kHz TO-220 Ta=25ºC Junction to Tab Junction to Ambient Junction to Tab Junction to Ambient ∆VREF=1% VIN=7V 1.4V ≤ (VIN – VOUT) (Note3) TA=125ºC, 1000 Hrs. TA=25ºC, 20 ms pulse 0.3 (Note 2) 0.01 0.25 0.003 3.0 60 3.0 60 3.0 60 3.0 60 3.0 60 3.0 60 1 0.020 1 0.020 % %/W % % VO ºC/W IOUT = 6.5A (Note 3) IOUT < 6.5A (Note 2) 6 6.9 1.250 5 0.005 0.005 0.05 0.05 1.225 1.270 10 0.2 0.2 0.3 0.3 1.5 6.9 1.225 1.270 10 0.2 0.2 0.3 0.3 1.5 V A % V V % SPX2870-5.0V, 0 ≤ IOUT ≤ 6.5A, 6.5V≤VIN≤7V 5 4.950 4.900 5.050 5.100 4.9 4.65 5.1 5.15 V SPX2870-3.3V, 0 < IOUT < 6.5A, 4.8V
