250 mA Low Drop Out Voltage Regulator

® SPX2954 250mA Low Dropout Voltage Regulator FEATURES ■ 5.0V and 3.3V Versions at 250mA Output ■ Accurate 0.5% for SPX2954A ■ Very Low Quiescent Current ■ Low Dropout: 310mV at 250mA ■ Extremely Tight Load and Line Regulation ■ Very Low Temperature Coefficient ■ Current and Thermal Limiting ■ Need only 1µF for Stability ■ Direct Replacement for LP2954 ■ Offered in TO-92, TO-263, SOT-223, TO-220 and SOIC 8 Pin Versions Only ■ Error Flag Warns of Output Dropout ■ Logic-Controlled Electronic Shutdown ■ Programmable Output from 1.24V to 30V +V IN 100K ERROR OUTPUT 5 8 ______ ERROR +V IN V OUT 1 1.2 to 30V SPX2954 SHUTDOWN INPUT 3 SD GND 4 R1 FB 7 + 3.3µF .01µF 1.23V V REF R2 Adjustable Regulator DESCRIPTION The SPX2954 and SPX2954A are low power voltage regulators. These devices are an excellent choice for use in battery-powered applications such as cordless telephones, radio control systems, and portable computers. The SPX2954 and SPX2954A feature low quiescent current and low dropout voltage (typ. 20mV at 100µA and 310mV at 250mA). This includes a tight initial tolerance (0.5% for SPX2954A), extremely good load and line regulation (0.05% typ.), and very low output temperature coefficient (20 ppm/°C typ.), making the SPX2954/SPX2954A useful as a low-power voltage reference. The error flag output feature is used as a power-on reset for warning of a low output voltage, due to a falling input voltage. The logic-compatible shutdown feature enables the regulator to be switched ON and OFF. The SPX2954/SPX2954A is offered in 3-pin TO-92, TO-263, SOT-223 and TO-220 packages, and 8 pin SOIC package. TO-263-3 Package (T) TO-263-5 Package (T5) 8-Pin Surface Mount (S) 1 2 SPX2954 8 7 6 5 INPUT FEEDBACK 5V, 3.3V TAP OUTPUT TO-92 (N) 1 2 3 SOT-223 Package (M3) TO-220-3 Package (U) TO-220-5 Package (U5) OUTPUT SPX2954 1 2 3 1 SPX2954 SENSE SPX2954 1 INPUT GND 2 3 SHUTDOWN 1) INPUT 3 2345 2) OUTPUT GND 3) GND4 4) SHUTDOWN 5) ERROR Top View SPX2954 SPX2954 1) INPUT 2) OUTPUT ERROR Bottom View VIN GND VOUT Front View 123 VIN GND VOUT 1 2 34 5 3) GND 4) SHUTDOWN 5) ERROR V IN GND V OUT Top View Top View Front View Front View Pin Connections Rev. 3/6/03 SP2954 250mA Low Dropout Voltage Regulator © Copyright 2003 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...........................................-0.3V to +30V Feedback Input Voltage....................................-1.5V to +30V Shutdown Input Voltage .................................-0.3V to +30V Error Comparator Output...................................-0.3V to +30V ESD Rating................................................................2kV Min ELECTRICAL CHARACTERISTICS PARAMETER 3.3 V Versions Output Voltage CONDITIONS VIN=VO + 1V, IL=100µA, CL=1µF (NOTE 2), TA = 25°C, unless otherwise specified. SPX2954A MIN. 3.284 3.267 3.260 3.251 TYP. 3.3 3.3 3.3 3.3 MAX 3.317 3.333 3.340 3.350 SPX2954 MIN. TYP. MAX. 3.267 3.251 3.234 3.201 3.3 3.3 3.3 3.3 3.333 3.350 3.366 3.399 UNIT V TJ=25°C -25°C≤TJ≤85°C Full Operating Temp. 100µA ≤IL ≤250 mA TJ ≤TJMAX TJ = 25°C -25°C ≤TJ ≤85°C Full Operating Temp. 100µA ≤IL ≤250 mA TJ ≤TJMAX (NOTE 1) Output Voltage 5 V Versions Output Voltage V 4.975 4.950 4.940 4.925 5.0 5.0 5.0 5.0 5.025 5.050 5.060 5.075 4.950 4.925 4.900 4.850 5.0 5.0 5.0 5.0 5.050 5.075 5.100 5.150 V Output Voltage All Voltage Options Output Voltage Temperature Coefficient V 20 0.03 0.04 60 290 310 150 3 10 270 0.05 430 160 100 100 0.10 0.20 100 450 500 170 6 14 550 0.2 50 0.04 0.10 60 290 310 150 3 10 270 0.05 430 160 100 150 0.20 0.30 100 450 500 170 6 14 550 0.2 ppm/°C % % mV Line Regulation (NOTE 3) VO+1V≤VIN≤30V | (NOTE 4) Load Regulation (NOTE 3) 100 µA≤IL≤250 mA Dropout Voltage (NOTE 5) Ground Current IL = 1mA IL = 100 mA IL = 250 mA IL = 1mA IL = 100 mA IL = 250 mA VOUT = 0 CL = 1µF CL = 200 µF CL = 3.3 µF, Bypass= 0.01µF from Pin 7 to Pin 1 (8 pin Versions) 8-Pin Versions only Reference Voltage Reference Voltage Feedback Pin Bias Current Vref Temperature Coefficient Feedback IBIAS Temperature Coefficient Over Temp (NOTE 6) 1.220 1.190 µA mA mA mA %/W µV rms µV rms µV rms Current Limit Thermal Regulation Output Noise, 10Hz to 100kHz 1.235 40 20 0.1 1.250 1.270 60 1.210 1.235 1.260 1.185 40 50 0.1 1.285 60 V V nA ppm/°C nA/°C Rev. 3/6/03 SP2954 250mA Low Dropout Voltage Regulator © Copyright 2003 Sipex Corporation 2 ELECTRICAL CHARACTERISTICS (Cont.) PARAMETER Error Comparator Output Leakage Current Output Low Voltage Upper Threshold Voltage Lower Threshold Voltage Hysteresis Shutdown Input logic Voltage Shutdown Input Current Low (Regulator ON) High (Regulator OFF) VS = 2.4V VS= 30V VOH = 30V VIN = VO-0.5V, IOL = 400µA (NOTE 7) (NOTE 7) (NOTE 7) CONDITIONS VIN=VO+1V, IL=100µA, CL=1µF (NOTE 2), TA = 25°C, unless otherwise specified. SPX2954A MIN. TYP. 0.01 150 40 60 75 15 1.3 2.0 30 400 3 50 800 10 0.7 2.0 95 MAX 1 250 40 SPX2954 MIN. TYP. MAX. 0.01 150 60 75 15 1.3 30 400 3 0.7 50 800 10 95 1 250 UNIT µA mV mV mV mV V µA µA Regulator Output Current (NOTE 8) in Shutdown 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 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 SPX2954 is tested at IL = 1mA. NOTE 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV 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≤ 250mA, 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/3.3V Tap. UNREGULATED DC 5V 7 FEEDBACK + 8 INPUT 1 OUTPUT 2 SENSE + _ FROM CMOS OR TTL 180kΩ 6 ERROR AMPLIFIER 5V TAP 3 SHUTDOWN 60 mV 330kΩ + 60kΩ + 5 ______ ERROR + _ ERROR DETECTION COMPARATOR 1µF . . TO CMOS OR TTL + 1.23V 4 REFERENCE GROUND SPX2954 Block Diagram, 8 Lead 5V Version Rev. 3/6/03 SP2954 250mA Low Dropout Voltage Regulator © Copyright 2003 Sipex Corporation 3 TYPICAL PERFORMANCE CHARACTERISTICS 6 5 OUTPUT VOLTAGE (VOLTS) INPUT CURRENT (µA) 250 225 R L = 50kΩ 10 4 R L =50kΩ 175 150 125 100 75 50 25 0 GROUND PIN CURRENT (mA) 200 1 3 R L =50kΩ 2 1 0 0 1 2 3 4 5 6 INPUT VOLTAGE (VOLTS) RL = 8 0.1 0 1 2 3 4 5 6 7 8 9 10 0.01 0.1 1 10 100 INPUT VOLTAGE (VOLTS) LOAD CURRENT (mA) Dropout Characteristics Input Current Quiescent Current 320 280 GROUND CURRENT (µA) INPUT CURRENT (mA) 240 200 160 IL= 0 I L = 1mA 120 80 40 0 0 1 2 3 4 5 6 7 8 160 150 140 130 120 110 100 90 80 70 60 50 40 30 20 10 0 0 1 2 3 4 5 6 6 GROUND CURRENT (mA) R L =50 Ω VOUT = 5V 5 V IN = 6V I L = 100mA 4 3 7 8 9 10 -75 -50 -25 0 25 50 75 100 125 150 TEMPERATURE (ºC) INPUT VOLTAGE (VOLTS) INPUT VOLTAGE (VOLTS) Ground Current 8 7 Input Current 190 Ground Current QUIESCENT CURRENT (µA) GROUND CURRENT (mA) 6 I L =100mA 170 V IN =6V I L =100uA 5 4 3 2 1 0 0 1 2 3 4 5 6 7 8 150 130 -75 -50 -25 0 25 50 75 100 125 150 INPUT VOLTAGE TEMPERATURE (ºC) Ground Current Quiescent Current Rev. 3/6/03 SP2954 250mA Low Dropout Voltage Regulator © Copyright 2003 Sipex Corporation 4 TYPICAL PERFORMANCE CHARACTERISTICS (CONT.) 500 I L = 150mA SHORT CIRCUIT CURRENT (mA) 500 240 230 400 DROP-OUT VOLTAGE (mV) DROP-OUT VOLTAGE (mV) 400 220 210 200 190 180 170 -75 -50 -25 300 200 ~ ~ 300 200 TJ = 25ºC 40 20 0 -75 -50 -25 0 25 50 75 100 125 150 I L = 100µA 100 0 100µA 1mA 10mA 100mA 0 25 50 75 100 125 150 TEMPERATURE (ºC) OUTPUT CURRENT TEMPERATURE (ºC) Drop-Out Voltage 8 V OUT = 5V Drop-Out Voltage 2.5 T A = 125ºC Short Circuit Current 100 mV 50 mV INPUT OUTPUT VOLTAGE VOLTAGE CHANGE 6 COMPARATOR OUTPUT (V) SINK CURRENT (mA) 2.0 4 HYSTERESIS 0 -50 mV ~ ~ 8V 6V 4V 0 200 400 TIME(µs) C L = 1µF I L = 1mA V OUT = 5V 1.5 T A = 25ºC 2 0 -2 0 1 PULLUP RESISTOR TO SEPARATE 5V SUPPLY 1.0 T A = -55ºC 0.5 0.0 2 3 4 5 0.0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 OUTPUT LOW VOLTAGE (V) INPUT VOLTAGE (V) 600 800 Error Comparator Output 10 IO = 100µA Comparator Sink Current 90 80 RIPPLE REJECTION (dB) Line Transient Response 90 80 RIPPLE REJECTION (dB) OUTPUT IMPEDANCE (OHMS) 5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 10 100 1K 10K 100K 1M FREQUENCY (Hz) V OUT = 5V C L = 1µF I O = 1mA I O = 100mA 70 IL = 0 70 60 50 40 30 20 I L = 1mA C L = 1µF V IN = 6V V OUT = 5V 60 50 40 30 20