®
SPX2815 1.5A Low Dropout Voltage Regulator
FEATURES ■ Guaranteed 1.5A Output Current ■ Three Terminal Adjustable or Fixed 2.5V, 3.3V and 5.0V ■ Low Quiescent Current ■ Low Dropout Voltage of 1.1V at 1.5A ■ 0.1% Line and 0.1% Load Regulation ■ Stable with 10uF Ceramic Capacitor ■ Overcurrent and Thermal Protection ■ Available Packages: TO-252, TO-220, and TO-263 ■ Similar to Industry Standard LT1086/ LT1586
APPLICATIONS ■ Desktop PC's Servers ■ Powering VGA and Sound Cards ■ Cordless Phones ■ Battery Chargers ■ Adjustable Power Supplies ■ Portable Instrumentation ■ SMPS Post-Regulator ■ Constant Current Regulators ■ Disk Drives Refer to Page 5 for Pinouts
DESCRIPTION The SPX2815 is a low power positive-voltage regulator designed to satisfy moderate power requirements with a cost effective, small footprint solution. This device is an excellent choice for use in battery-powered applications and portable computers. The SPX2815 features very low quiescent current and a low dropout voltage of 1.1V at a full load. As output current decreases, quiescent current flows into the load, increasing efficiency. SPX2815 is available in adjustable or fixed 2.5V, 3.3V and 5.0V output voltages. The SPX2815 is offered in several 3-pin surface mount packages: TO-252, TO-220 and TO-263. An output capacitor of 10µF ceramic or tantalum provides unconditional stability. FUNCTIONAL DIAGRAM (Adjustable)
VIN
Current Limit
+ VOUT ICL _ AMP + 1.25V
Thermal Limit
+ –
VREF ADJ/GND IADJ ~ 50µA –
I TL
Date: 5/17/04 SPX2815 1.5A Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
1
ABSOLUTE MAXIMUM RATINGS
Power Dissipation.......................................Internally Limited Lead Temperature (soldering, 5 seconds) ...............260°C Storage Temperature Range.......................-65°C to +150°C Operating Junction Temperature Range.....-40°C to +125°C Input Supply Voltage .................................................... +10V Input to Output Voltage ................................................ +8.8V ESD Rating .............................................................. 2kV min
ELECTRICAL CHARACTERISTICS
at VIN=VOUT + 1.5V, TA = 25°C, CIN = COUT = 10µF, IOUT =10mA, unless otherwise specified. The Boldface applies over the full operating temperature range.
PARAMETER 2.5V Version Output Voltage 3.30V Version Output Voltage 5.0V Version Output Voltage All Voltage Options Reference Voltage Output Voltage Temperature Stability Line Regulation 1.238 1.250 1.225 0.3 0.1 0.1 0.1 0.1 0.1 0.1 1.00 1.10 4 50 2.5 0.01 60 75 0.03 0.003 0.1 60 0.2 0.2 0.2 0.3 0.3 0.3 1.2 10 120 2.5 0.01 75 0.03 0.003 0.1 1.262 1.225 1.250 1.275 1.212 0.5 0.1 0.1 0.1 0.1 0.1 0.1 1.00 1.10 4 50 0.2 0.2 0.2 0.3 0.3 0.3 1.2 10 120 mA µA A %/W dB % % (VIN-VOUT)=5V 25°C, 30mS pulse fRIPPLE=120Hz, (VIN-VOUT)=2V, VRIPPLE=1VPP 125°C, 1000Hrs % of VOUT, 10Hz≤f≤10kHz 1.275 1.287 V % % 4.25V≤VIN≤ 10V,VOUT=2.5V,IOUT=10mA 4.75V≤VIN≤ 10V,VOUT=3.3V,IOUT=10mA 6.50V≤VIN≤ 10V,VOUT=5.0V,IOUT=10mA 10mA≤IOUT≤ 1.5A, VOUT=2.5V 10mA≤IOUT≤ 1.5A, VOUT=3.3V 10mA≤IOUT≤ 1.5A, VOUT=5.0V IOUT=0.5A IOUT=1.5A Fixed voltage versions IOUT=10mA, (VIN - VOUT )= 2V 10mA≤IOUT≤ 3A, 1.5V≤(VIN-VOUT)≤ 10V 4.950 5.000 4.900 5.050 4.900 5.000 5.100 4.850 5.100 5.150 V IOUT=10mA, VIN=7V 10mA ≤ IOUT ≤ 3A, 6.50V ≤ VIN ≤ 10V 3.267 3.300 3.234 3.333 3.234 3.300 3.366 3.201 3.366 3.399 V IOUT = 10mA, VIN =5V 10mA ≤ IOUT ≤ 3A, 4.75V ≤ VIN ≤ 10V MIN TYP SPX2815A 2.475 2.500 2.450 MAX MIN TYP SPX2815 2.525 2.450 2.500 2.550 2.425 2.550 2.575 V IOUT = 10mA, VIN =4.5V 10mA ≤ IOUT ≤ 3A, 4.25V ≤ VIN ≤ 10V MAX UNITS CONDITIONS
Load Regulation
%
Dropout Voltage (Note 2) Quiescent Current Adjust Pin Current Current Limit Thermal Regulation Ripple Rejection Long Term Stability RMS Output Noise
V
Date: 5/17/04
SPX2815 1.5A Low Dropout Voltage Regulator
© Copyright 2004 Sipex Corporation
2
TYPICAL PERFORMANCE CHARACTERISTICS
1.275
3.325 3.320
1.27 1.265 1.26 1.255 1.25 1.245 1.24 1.235 1.23 1.225 -50
1.25v Adj
Vout (V)
3.315 3.310 3.305 3.300 4.5 6.5 8.5 10.5 Vin (V) 12.5 14.5
Vout (V)
-30
-10
10
30
50
70
90
110
130
Temp (C)
Figure 1. Line Regulation for SPX2815U-3.3; IOUT=10mA
Figure 2. VOUT vs Temperature, VIN=2.5V, IOUT=10mA
2.55 2.54 2.53 2.52 2.51 2.5 2.49 2.48 2.47 2.46 2.45 -50
3.38
2.5v Adj 2.5v Fixed
3.36 3.34
Vout (V)
3.3v Adj 3.3v Fixed
Vout (V)
3.32 3.3 3.28
-30
-10
10
30 50 Temp (C)
70
90
110
130
3.26 -50
-30
-10
10
30
50
70
90
110
130
Temp (C)
Figure 3. VIN=4.0V, IOUT=10mA
Figure 4. VIN=5.0V, IOUT=10mA
APPLICATION INFORMATION
Output Capacitor
To ensure the stability of the SPX2815, an output capacitor of at least 10µF (ceramic or tantalum) or 22µF (aluminum) is required. The value may change based on the application requirements of the output load or temperature range. The value of ESR can vary based on the type of capacitor used in the applications to guarantee stability. The recommended value for ESR is 0.5Ω or less. A larger value of output capacitance (up to 100µF) can improve the load transient response.
Soldering Methods
continuous load conditions such that the maximum junction temperature does not exceed 125°C. Thermal protection is activated at >179°C and deactiviated at
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