700mA low dropout voltage regulators with shutdown

SPX2700/01/02 700mA Low Dropout Voltage Regulators With Shutdown (PRELIMINARY INFORMATION) FEATURES • Output Current 700mA at 3.3V and 5V • Internal Short Circuit Current Limit • Dropout Voltage 0.5V at 700mA Output • Extremely Tight Load and Line Regulation • Very Low Temperature Coefficient • Mirror Image Insertion Protection • Unregulated DC Input Can Withstand -20V Reverse Battery and +60V Positive Transients • Direct Replacement For LM2937 Socket APPLICATIONS • Battery Powered Systems • Cordless Telephones • Automotive Electronics • Portable/ Palm Top / Notebook Computers • Portable Consumer Equipment • Portable Instrumentation • SMPS Post-Regulator • Voltage Reference PRODUCT DESCRIPTION The SPX2700/01/02 are a low power positive voltage regulators. The SPX2700/01/02 offers 700mA output current with a dropout voltage of only 0.5V and over temperature dropout is up to 1V. The quiescent current is 10mA at differential output of 5V and output current of 700mA. A higher quiescent current can exist when the device is in dropout mode (VIN -VOUT≤ 3V). The regulator will automatically shut down to protect both the internal circuits and the load. This device also features short circuit and thermal overload protection. The SPX2700/01/02 is offered in 3 and 5 pin TO-220, TO-263 and 3-pin SOT-223 packages compatible with other 5V and 3.3V regulators, TO-263 and 3-pin SOT-223. The device is offered in standard output voltages of 5V and 3.3V as well as in adjustable output regulator. PIN CONNECTIONS TO-263-5 (T) TO-220-5 (U) TO-220-3 (U) TO-263-3 (T) SOT-223 (M3) SPX 2700/01/02 12345 SPX2700 SPX 2701/02 1 2 3 45 Five Lead Package Pin Functions: 1) 2) 3) 4) 5) Error Input GND Output Shutdown Adjust Shutdown GND Input Output SPX2700 1 2 3 SPX2700 3 1 2 3 1 2 VIN GND VOUT VIN GND VOUT Top View Top View Front View Top View VIN GND V OUT Front View Rev. 10/25/00 SPX2700/01/02 ABSOLUTE MAXIMUM RATINGS Power Dissipation..........................................Internally Limited Lead Temp. (Soldering, 10 Seconds) .............................. 260°C Feedback Input Voltage...................................... -1.5V to +30V Shutdown Input Voltage..................................... -0.3V to +30V Error Comparator Output ................................... -0.3V to +30V Continuous ......................... +12V Transient................-20V to +60V Storage Temperature Range .........................-65° to +150°C Operating Junction Temperature Range ..... -40°C to +125°C ESD Rating .....................................2KV Min Input Supply Voltage ELECTRICAL CHARACTERISTICS at VIN = VO + 5V, IO = 700mA, CO = 10 µF, unless otherwise specified. Limits in Boldface type apply over the entire operating temperature range. All other specifications are TA = 25°C. Parameter Conditions Typ. SPX2700/01/02A SPX2700/01/02 Units (Note 2) Min Max Min Max 3.3V Version Output Voltage -40°C≤TJ≤+125°C 1mA≤ IL≤500mA 5V Version Output Voltage -40°C≤TJ≤+125°C 1mA≤ IL≤700mA All Voltage Options Output Voltage Temperature Coefficient Line Regulation (Note 3) Load Regulation (Note 3) Dropout Voltage (Note 5) 3.3 3.3 3.267 3.217 3.333 3.382 3.234 3.185 3.366 3.415 V 5.0 5.0 4.950 4.880 5.050 5.120 4.900 4.870 5.100 5.130 V 20 (Note1) 6V≤ VIN≤30V (Note4) IL = 1 to 700 IL = 0.1 to 1mA IL = 1mA IL = 700mA 0.03 0.04 60 375 100 4.5 15 IL = 700mA 20 100 0.1 0.40 0.20 0.30 100 150 400 500 150 180 2 2.5 14 16 20 22 700 800 0.2 1.0 0.60 1.0 150 0.20 0.80 0.30 0.50 100 150 400 500 150 180 2 2.5 14 16 20 22 700 800 0.2 0.60 ppm/°C %max %max mV Ground Current IL = 1mA µA mA Current Limit Thermal Regulation Output Noise, 10Hz to 100kHz IL = 100mA Adjustable Versions Only Reference Voltage Feedback Pin Bias Current Reference Voltage Temperature Coefficient Feedback Pin Bias Current Temperature Coefficient VOUT = 0 0.05 CL = 2.2µF CL = 33µF Over Temperature (Note 6) 400 200 1.235 20 (Note 7) 50 0.1 mA %/w µV Vrms V nA ppm/°C NA/°C 1.210 1.200 1.185 1.260 1.270 1.285 40 60 1.200 1.980 1.185 1.270 1.272 1.285 60 80 Rev. 10/25/00 SPX2700/01/02 ELECTRICAL CHARACTERISTICS at VIN = VO + 5V, IO = 700mA, CO = 22 µF, unless otherwise specified. Limits in Boldface type apply over the entire operating temperature range. All other specifications are TA = 25°C. Parameter Conditions Typ. SPX2700/01/02A SPX2700/01/02 Units Min Max Min Max Error Comparator Output Leakage Current Output Low Voltage Upper Threshold Voltage Lower Threshold Voltage Hysteresis Shutdown Input Input Logic Voltage Shutdown Pin Input Current VOH = 30V VIN = 4.5V IOL = 400µA (Note 8) (Note 8) (Note 8) Low (Regulator ON) High (Regulator OFF) VS = 2.4V VS = 30V Regulator Output Current In Shutdown 0.01 150 60 75 15 0.7 2.0 30 450 3 50 100 600 750 10 20 2.0 90 150 800 1000 15 25 µA 0.7 40 25 95 140 1.00 2.00 250 400 40 25 95 140 1.00 2.00 250 400 µA mV mV mV mV V µA Note 1: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range. Note 2: Unless otherwise specified all limits are guaranteed for Tj = 25°C, VIN = 6V, IL = 100µA and CL = 1µF. Additional conditions for the 8-pin versions are feedback tied to 5V tap and output tied to output sense (VOUT = 5V) and VSHUTDOWN ≤ 0.8V. Note 3: Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are covered under the specification for thermal regulation. Note 4: Line regulation for the SPX2700/01/02 is tested at 150°C for IL = 1 mA. For IL = 100µA and TJ = 125°C, line regulation is guaranteed by design to 0.2%. See typical performance characteristics for line regulation versus temperature and load current. Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential at very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account. Note 6: VREF ≤VOUT ≤ (Vin - 1V), 2.3 ≤Vin≤30V, 100µA≤IL≤ 250 mA, TJ ≤ TJMAX. Note 7: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at 6V input. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = VOUT/VREF = (R1 + R2)/R2. For example, at a programmed output voltage of 5V, the Error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 = 384 mV. Thresholds remain constant as a percent of VOUT as VOUT is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed. Note 8: VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT =0, Feedback pin tied to 5V Tap. Note 9: The junction -to-ambient thermal resistance of the TO-92 package is 180°C/ W with 0.4” leads and 160°C/ W with 0.25” leads to a PC board. The thermal resistance of the 8-Pin DIP package is 105°C/W junction-to-ambient when soldered directly to a PC board. Junction-to-ambient thermal resistance for the SOIC (S) package is 160°C/W. UNREGULATED DC 5V @ 700mA MAX FEEDBACK INPUT OUTPUT + SENSE + _ FROM CMOS OR TTL 180kΩ .. ERROR AMPLIFIER 60k Ω .. + 60 mV + 1.23V REFERENCE + _ ERROR DETECTION COMPARATOR ______ ERROR 5V TAP + 1 µF .. 330kΩ .. SHUTDOWN TO CMOS OR TTL GROUND SPX2700/01/02 Block Diagram Rev. 10/25/00 SPX2700/01/02 APPLICATION HINTS EXTERNAL CAPACITORS The stability of the SPX2700/01/02 requires a 10µF or greater capacitor between output and ground. Oscillation could occur without this capacitor. Most types of tantalum or aluminum electrolytic works fine here. For operations below -25°C solid tantalum is recommended since the many aluminum types have electrolytes that freeze at about -30°C. The ESR of about 5Ω or less and resonant frequency above 500 kHz are the most important parameters in the value of the capacitor. The capacitor value may be increased without limit. At lower values of output current, less output capacitance is required for stability. For the currents below 10mA the value of the capacitor can be reduced to 22µF and 0.15µF for 1mA. More output capacitance is needed for the 8-pin version at voltages below 5V since it runs the error amplifier at lower gain. At worst case 22µF or greater must be used for the condition of 750mA load at 1.23V output. The SPX2700/01/02, unlike other low dropout regulators will remain stable and in regulation with no load in addition to the internal voltage divider. This feature is especially important in applications like CMOS RAM keep-alive. When setting the output voltage of the SPX2700/01/02 version with external resistors, a minimum load of 5mA is recommended. If there is more than 10 inches of wire between the input and the AC filter capacitor or if a battery is used as the input then a 1µA tantalum or aluminum electrolytic capacitor should be placed from the input to the ground. ERROR DETECTION COMPARATOR OUTPUT 4.75V OUTPUT VOLTAGE _______ ERROR* high around 5V input (input voltage at which Vout = 4.75 ). Since the SPX2700/01/02’s dropout voltage is load dependent, the input voltage trip point (around 5V) will vary with the load current. The output voltage trip point (approx. 4.75V) does not vary with load. The error comparator has an open-collector output, which requires an external pull-up resistor. Depending on the system requirements the resistor may be returned to 5V output or other supply voltage. In determining the value of this resistor, note that the output is rated to sink 250µA, this value adds to battery drain in a low battery condition. Suggested values range from 100K to 1MΩ. If the output is unused this resistor is not required. PROGRAMMING THE OUTPUT VOLTAGE OF SPX2700/01/02 The SPX2700/01/02 may be programmed for any