PDF《SPX29150/51/52/53》

1 REV B 06/05/08 SP29150/51/52/53 1.

5A Low Dropout Voltage Regulator ? Copyright

2008 Exar Corporation 1.5A Low Dropout Voltage Regulator SPX29150/51/52/53 DESCRIPTION FEATURES Adjustable Output Down to 1.25V 1% Output Accuracy Output Current of 1.5A Low Dropout Voltage of 390mV @ 1.5A Extremely Tight Load and Line Regulation Extremely Fast Transient Response Reverse-Battery Protection Zero Current Shutdown (5 pin version) Error Flag Signal Output for Out of Regulation State (5 pin version) Standard TO-220 and TO-263 Packages The SPX29150/51/52/53 are 1.5A, highly accurate voltage regulators with a low dropout voltage of 390mV (typical) @ 1.5A. These regulators are specifically designed for low volt- age applications that require a low dropout voltage and a fast transient response. They are fully fault protected against over-current, reverse battery, and positive and negative voltage transients. On-chip trimming adjusts the reference voltage to 1% initial accuracy. Other features in the

5 pin versions include Enable and Error Flag. The SPX29150/51/52/53 is offered in 3-pin and 5-pin TO-220 & TO-263 packages. For a 3A version, refer to the SPX29300 data sheet. APPLICATIONS Powering VGA and Sound Cards LCD Monitors USB Power Supplies PowerPC? Supplies SMPS Post Regulators High-efficiency "Green" Computer Systems High-efficiency Linear Power Supplies Portable Instrumentation Constant Current Regulators Adjustable Power Supplies Battery Chargers Figure 1. Fixed Output Linear Regulator Figure 2. Adjustable Output Linear Regulator TYPICAL APPLICATION CIRCUITs SPX29152 VOUT VIN GND ADJ

1 2

3 4

5 R1 R2 6.8? F + + 10? F SPX29150 VOUT VIN 6.8? F + + 10? F

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3 Rev B 06/05/08 SP29150/51/52/53 1.5A Low Dropout Voltage Regulator ? Copyright

2008 Exar Corporation ABSOLUTE MAXIMUM RATINGS Storage Temperature Range 65°C to +150°C Operating Junction Temperature Range...... -40°C to +125°C Input Voltage (Note 7)16V ELECTRICAL CHARACTERISTICS at VIN=VOUT + 1V and IOUT = 10mA, CIN = 6.8?F, COUT = 10?F, TA = 25°C, unless otherwise specified. The Boldface applies over the junction temperature range. Adjustable versions are set to 5.0V. PARAMETER CONDITIONS Typ SPX29150/51 Min Max Units 1.8V Version Output Voltage IOUT = 10mA 10mA ≤ IOUT ≤ 1.5A, 2.5V ≤ VIN ≤?16V 1.8 1.8 1.782 1.764 1.818 1.836 V 2.5V Version Output Voltage IOUT = 10mA 10mA ?? ≤? IOUT≤ 1.5A, 3.5V?? ≤? VIN ≤??? 16V 2.5 2.5 2.475 2.450 2.525 2.550 V 3.3V Version Output Voltage IOUT = 10mA 10mA ?? ≤? IOUT≤ 1.5A, 4.3V?? ≤? VIN ≤??? 16V 3.3 3.3 3.267 3.234 3.333 3.366 V 5.0V Version Output Voltage IOUT = 10mA 10mA ?? ≤? IOUT≤ 1.5A, 6.0V?? ≤? VIN ≤??? 16V 5.0 5.0 4.950 4.900 5.050 5.100 V All Voltage Options SPX29150/51/52/53 Line Regulation IO = 10mA, (VOUT + 1V) ??? ≤?? VIN ≤???? 16V 0.1 0.5 % Load Regulation VIN = VOUT + 1V, 10mA ≤ IOUT≤ IFULL- LOAD 0.2

1 % ?V Output Voltage Temperature Coefficient

13 100 ppm/°C ?T Dropout Voltage (Note 1) (except 1.8V version) IO = 100mA

70 200 mV IO = 750mA

230 IO = 1.5A

390 600 Ground Current (Note 3) IO = 750mA, VIN = VOUT, +1V IO = 1.5A

12 45

25 mA IGNDDO Ground Pin Cur- rent at Dropout VIN = 0.1V less than specified VOUT IOUT = 10mA 0.9 mA Current Limit VOUT = 0.0V (Note 2) 2.2 1.7 A Output Noise Voltage (10Hz to 100kHz) IL = 100mA CL = 10?F CL = 33?F

400 260 ?VRMS Reference Voltage Adjustable version only 1.240 1.228 1.215 1.252 1.265 V Reference Voltage Adjustable version only (Note 8) 1.203 1.277 Adjust Pin Bias Current

40 80

120 nA Reference Voltage Tem- perature Coefficient (Note 4)